SERVICE MANUAL

RH-9820

Please read this manual before making any adjustments.

ELECTRONIC EYELET BUTTON HOLER

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 This service manual is intended for RH-9820; be sure to read the RH-9820 instruction manual before
this manual.
Carefully read the “SAFETY INSTRUCTIONS” and the whole of this manual to understand this product
before you start maintenance.
As a result of research and improvements regarding this product, some details of this manual may not
be the same as those for the product you purchased.
If you have any questions regarding this product, please contact a Brother dealer.

RH-9820

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 SAFETY INSTRUCTIONS
[1] Safety indications and their meanings
This service manual and the indications and symbols that are used on the machine itself are provided in order to ensure safe
operation of this machine and to prevent accidents and injury to yourself or other people.
The meanings of these indications and symbols are given below.

Indications
The instructions which follow this term indicate situations where failure to follow
DANGER the instructions will result in death or serious injury.

The instructions which follow this term indicate situations where failure to follow
CAUTION the instructions could cause injury when using the machine or physical damage
to equipment and surroundings.

Symbols

..……… This symbol ( ) indicates something that you should be careful of. The picture inside the triangle
indicates the nature of the caution that must be taken.
(For example, the symbol at left means “beware of injury”.)

..……… This symbol ( ) indicates something that you must not do.

..……… This symbol ( ) indicates something that you must do. The picture inside the circle indicates the
nature of the thing that must be done.
(For example, the symbol at left means “you must make the ground connection”.)

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 [2] Notes on safety

DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the cover of the control box. Touching areas where high voltages are present can result in severe
injury.

CAUTION
Environmental requirements
Use the sewing machine in an area which is free The ambient temperature should be within the range
from sources of strong electrical noise such as of 5°C to 35°C during use.
electrical line noise or static electric noise. Temperatures which are lower or higher than this
Sources of strong electrical noise may cause may cause problems with correct operation.
problems with correct operation.
The relative humidity should be within the range of
Any fluctuations in the power supply voltage should 45% to 85% during use, and no dew formation
be within ±10% of the rated voltage for the machine. should occur in any devices.
Voltage fluctuations which are greater than this may Excessively dry or humid environments and dew
cause problems with correct operation. formation may cause problems with correct
The power supply capacity should be greater than operation.
the requirements for the sewing machine's power In the event of an electrical storm, turn off the power
consumption. and disconnect the power cord from the wall outlet.
Insufficient power supply capacity may cause Lightning may cause problems with correct
problems with correct operation. operation.
The pneumatic delivery capability should be greater
than the requirements for the sewing machine's total
air consumption.
Insufficient pneumatic delivery capability may cause
problems with correct operation.

Installation
Machine installation should only be carried out by a All cords should be secured at least 25 mm away
qualified technician. from any moving parts. Furthermore, do not
Contact your Brother dealer or a qualified electrician excessively bend the cords or secure them too firmly
for any electrical work that may need to be done. with staples.
If this is not observed, fire or electric shocks may
The sewing machine weighs approximately 120 kg. result.
Installation of the sewing machine and adjustment of
the table height should be carried out by four or Install belt covers to the machine head.
more people.
Do not connect the power cord until installation is If using a work table which has casters, the casters
complete. If this is not done, the sewing machine should be secured in such a way so that they cannot
may operate if the start switch is pressed by mistake, move.
which could result in serious injury. Be sure to wear protective goggles and gloves when
Hold the machine head with both hands when tilting handling the lubricating oil, so that it does not get
it back or returning it to its original position. into your eyes or onto your skin.
In addition, do not subject the machine head to extra If care is not taken, inflammation can result.
force while it is tilted back. Furthermore, do not drink the lubricating oil. Diarrhea
If this is not observed, the machine head may or vomiting may result.
become unbalanced and fall over (together with the Keep the oil out of the reach of children.
table), and serious injury or damage to the sewing
machine may result.
Be sure to connect the ground. If the ground
connection is not secure, you run a high risk of
receiving a serious electric shock, and problems with
correct operation may also occur.

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 CAUTION
Sewing
This sewing machine should only be used by If using a work table which has casters, the casters
operators who have received the necessary training should be secured in such a way so that they cannot
in safe use beforehand. move.
The sewing machine should not be used for any Attach all safety devices before using the sewing
applications other than sewing. machine. If the machine is used without these
Be sure to wear protective goggles when using the devices attached, injury may result.
machine. Do not touch any of the moving parts or press any
If goggles are not worn, there is the danger that if a objects against the machine while sewing, as this
needle breaks, parts of the broken needle may enter may result in personal injury or damage to the
your eyes and injury may result. machine.
Turn off the power switch at the following times. If If an error occurs in machine operation, or if
this is not done, the sewing machine may operate if abnormal noises or smells are noticed, immediately
the start switch is pressed by mistake, which could turn off the power switch. Then contact your nearest
result in serious injury. Brother dealer or a qualified technician.
• When threading the needle If the machine develops a problem, contact your
• When replacing the needle nearest Brother dealer or a qualified technician.
• When not using the machine and when leaving the
machine unattended

Cleaning
Turn off the power switch before carrying out this Be sure to wear protective goggles and gloves when
operation. If this is not done, the sewing machine handling the lubricating oil, so that it does not get into
may operate if the start switch is pressed by mistake, your eyes or onto your skin.
which could result in serious injury. If care is not taken, inflammation can result.
Furthermore, do not drink the lubricating oil. Diarrhea
or vomiting may result.
Keep the oil out of the reach of children.

Maintenance and inspection

Disassembly, assembly, maintenance and inspection Hold the machine head with both hands when tilting
of the sewing machine should only be carried out by it back or returning it to its original position.
a qualified technician. In addition, do not subject the machine head to extra
Ask your Brother dealer or a qualified electrician to force while it is tilted back.
carry out any maintenance and inspection of the If this is not observed, the machine head may
electrical system. become unbalanced and fall over (together with the
table), and serious injury or damage to the sewing
Turn off the power switch and disconnect the power machine may result.
cord at the following times. If this is not done, the
sewing machine may operate if the start switch is Be sure to wear protective goggles and gloves when
pressed by mistake, which could result in serious handling the lubricating oil and grease, so that they
injury. do not get into your eyes or onto your skin, otherwise
inflammation can result.
• When carrying out inspection, adjustment and
Furthermore, do not drink the oil or eat the grease
maintenance
under any circumstances, as they can cause
• When replacing consumable parts such as the
vomiting and diarrhea.
loopers and knife
Keep the oil out of the reach of children.
Turn off the power switch before inserting or
Use only the proper replacement parts as specified
removing the plug, otherwise damage to the control
by Brother.
box could result.
If any safety devices have been removed, be
Disconnect the air hoses from the air supply and wait
absolutely sure to re-install them to their original
for the needle on the pressure gauge to drop to “0”
positions and check that they operate correctly
before carrying out inspection, adjustment and repair
before using the machine.
of any parts which use the pneumatic equipment.
Any problems in machine operation which result
If the power switch and air need to be left on when
from unauthorized modifications to the machine will
carrying out some adjustment, be extremely careful
not be covered by the warranty.
to observe all safety precautions.

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 [3] Warning labels
The following warning labels appear on the sewing machine.
Please follow the instructions on the labels at all times when using the machine. If the labels have been
removed or are difficult to read, please contact your nearest Brother dealer.

1 2

Do not touch the knife or press any Safety devices

3 objects against the machine while Devices such as eye guard, finger guard,
sewing, as this may result in personal needle bar guard, needle guide cover and
injury or damage to the machine. belt cover

Be careful not to get your hands Be careful not to get your hands caught
4 caught when returning the machine
5 when moving the feed base backward.
head to its original position after it
has been tilted.

Be sure to connect the ground. If the Direction of operation

6 ground connection is not secure, you
7
run a high risk of receiving a serious
electric shock, and problems with
correct operation may also occur.

High temperature warning display

8

Needle bar guard

Eye guard

Needle guide cover

Finger guard

0534B
0302B 0330B

RH-9820
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 0332B 0331B

Belt cover
(Rear)

0333B

0486B

0334B 0485B

RH-9820 v

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 CONTENTS
1. MACHINE SPECIFICATIONS....... 1 5. DISASSEMBLY........................... 38
2. FUNCTION SETTINGS ................. 2 5-1. Covers and presser foot mechanism.................................39
5-2. Upper shaft motor unit mechanism....................................40
2-1. List of special functions when power is turned on...............2
5-3. Feed mechanism.................................................................41
2-2. List of advanced functions.....................................................3
5-3-1. Feed base unit ..........................................................41
2-3. Memory switch setting method (Advanced)........................4
5-3-2. X feed unit..................................................................42
2-4. List of memory switch settings..............................................5 5-3-3. Y feed unit..................................................................42
2-5. Error history checking method............................................14 5-4. Lower thread tension mechanism......................................43
2-6. Input checking method ........................................................15 5-5. Spreader mechanism..........................................................44
2-7. Output checking method.....................................................18 5-6. Looper mechanism..............................................................45
2-8. Software version checking method....................................21 5-7. Needle bar rocking mechanism .........................................46
3. READING/WRITING DATA ........ 22 5-8. Looper base mechanism ....................................................47

3-1. Precautions when handling CF cards (commercially 5-9. Needle bar mechanism.......................................................48
available).............................................................................22 5-10. Lubrication..........................................................................49
3-2. Structure of a CF card folder...............................................22 5-11. Zigzag and thread take-up mechanisms.........................51
3-3. Data read/write mode..........................................................23 5-12. Upper shaft mechanism....................................................52
3-4. Reading parameter data from the CF card .......................24 5-13. Cutter mechanism .............................................................53
3-5. Writing parameter data to the CF card ..............................24
6. ASSEMBLY................................. 54
3-6. Reading memory switch data from the CF card...............24
6-1. Cutter mechanism ...............................................................55
3-7. Writing memory switch data to CF cards...........................24
6-2. Needle bar mechanism (1) .................................................57
3-8. Writing error log data to the CF card..................................25
6-3. Zigzag mechanism ..............................................................59
3-9. Updating the main control program....................................25
6-4. Upper shaft mechanism......................................................61
3-10. Updating the panel control program ................................25
6-5. Thread take-up mechanism................................................64
4. MECHANICAL DESCRIPTIONS .. 26 6-6. Needle bar mechanism (2) .................................................65
4-1. Upper shaft and Needle bar mechanisms.........................26 6-7. Y feed mechanism...............................................................69
4-2. Zigzag and thread take-up mechanisms...........................27 6-8. Looper base mechanism ....................................................73
4-3. Needle bar rocking mechanism..........................................28 6-9. Needle bar rocking mechanism .........................................79
4-4. Feed mechanism.................................................................29 6-10. Lower shaft mechanism....................................................85
4-5. Presser foot mechanism .....................................................30 6-11. Looper mechanism ...........................................................90
4-6. Cloth opening mechanism ..................................................31 6-12. Spreader mechanism........................................................92
4-7. Cutter mechanism................................................................32 6-13. Upper thread trimmer mechanism...................................94
4-8. Looper mechanism..............................................................32 6-14. Threading mechanism ......................................................95
4-9. Spreader mechanism..........................................................33 6-15. Feed base mechanism .....................................................97
4-10. Upper thread trimmer mechanism...................................33 6-15-1. Feed base.............................................................97
4-11. Upper tension release mechanism..................................34 6-15-2. X feed shaft holder.............................................104
4-12. Upper thread take-up mechanism ...................................34 6-16. X feed mechanism ..........................................................107
4-13. Lower thread release and lower thread take-up 6-17. Lower thread tension mechanism..................................109
mechanisms.......................................................................35
6-18. Upper shaft motor mechanism.......................................111
4-14. Gimp thread take-up mechanism
6-19. Covers ..............................................................................115
<-01 specifications only>...................................................35
6-20. Work clamp plate mechanism........................................117
4-15. Lower thread trimmer mechanism...................................36
6-21. Lower thread trimming mechanism...............................121
6-22. Upper cover mechanism (upper thread tension release
and upper thread take-up mechanisms
and upper thread path)........................................................... 127

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 6-22. Routing the harnesses ....................................................129 7-25-1. Replacing the movable knife and fixed knife....169
6-23. Routing the air tubes........................................................131 7-25-2. Adjusting the cutting pressure ...........................170
《Solenoid valve tubes and functions》........................133 7-25-3. Adjusting the meshing amount..........................170
6-24. Lubrication and greasing and routing the oil tubes.......135 7-25-4. Adjusting the thread nipper assembly and
opener..................................................................171
7. ADJUSTMENTS......................... 141
7-25-5. Adjusting the thread handler..............................173
7-1. Adjusting the heights of the spreaders and loopers .......141
7-26. Replacing and adjusting the movable knife and fixed
7-2. Adjusting the zigzag width (stitch width) ..........................142
knife (for the lower thread and gimp)
7-3. Adjusting the zigzag base line position............................143 <-02 specifications>.........................................................174
7-4. Adjusting the needle and looper timing............................146 7-26-1. Replacing the movable knife and fixed knife ...174
7-5. Adjusting the looper stroke................................................147 7-26-2. Adjusting the cutting pressure...........................174
7-6. Adjusting the height of the needle bar..............................148 7-26-3. Adjusting the movable knife
7-7. Adjusting the clearance between the loopers and installation position..............................................175
needle ...............................................................................149 7-26-4. Adjusting the position of the sub clamp...........176
7-8. Adjusting the needle guard ...............................................149 7-26-5. Differences from older models .........................177
7-9. Adjusting the spreader installation positions....................150 7-27. Adjusting the gimp trailing length
7-10. Adjusting the spreader timing .........................................151 <-02 specifications only> ................................................179

7-11. Adjusting the height of the throat plate...........................152 7-28. Adjusting the position of the lower thread presser
<-02 specifications only> ................................................180
7-12. Changing the cutting length (Replacing the hammer) .153
7-29. Adjustment of the phase for the take-up roller cam......181
7-13. Adjusting the cutting surface of the hammer.................154
7-30. Adjusting the needle bar and looper base turning
7-13-1. Filing the cutting surface of the hammer ..........154
center................................................................................182
7-13-2. Adjusting the contact between the knife and the
7-31. Adjusting the upper thread loosening amount..............183
hammer...............................................................155
7-32. Adjusting the lower thread loosening amount...............184
7-14. Adjusting the axial play of the hammer..........................155
7-33. Adjusting the looper base home position ......................185
7-15. Making the cutter driving shaft and driving shaft presser
move together..................................................................156 7-34. Adjusting the feed base X home position and Y home
position..............................................................................187
7-16. Replacing the knife and adjusting its position ...............157
7-35. Adjusting the needle up signal home position for the
7-16-1. Replacing the knife.............................................157
upper shaft and upper shaft motor.................................189
7-16-2. Making fine adjustments to the knife position....158
7-36. Adjusting the upper shaft stop position..........................191
7-17. Adjusting the cutting pressure ........................................160
7-37. Installing (replacing) the sub clamp on the left side......192
7-18. Adjusting the work clamp lift amounts ...........................161
7-19. Adjusting the work clamp positions................................162
8. ELECTRICAL MECHANISM...... 197
8-1. Precautions while carrying out adjustments....................197
7-20. Adjusting the positions of the work clamp plates..........163
8-2. Inside the control box and operation panel structure .....198
7-21. Adjusting the cloth opening amounts.............................164
8-3. Description of fuses ...........................................................199
7-22. Adjusting the upper thread feeding amount..................165
8-4. Description of connectors..................................................200
7-23. Adjusting the lower thread feeding amount
<-01 specifications only>.................................................166 8-4-1. Connector positions................................................200
7-24. Replacing and adjusting the upper movable knife........166 8-4-2. Symptoms when there are poor connections......203
7-24-1. Replacing the upper movable knife...................166 8-5. Troubleshooting .................................................................206
7-24-2. Adjusting the upper movable knife....................167 8-5-1. Troubleshooting procedure...................................206
7-24-3. Adjusting the position of the thread trimmer lever 8-5-2. Diagnosis flowchart................................................207
bracket .................................................................168 8-5-3. Remedy ..................................................................210
7-25. Replacing and adjusting the movable knife and fixed
knife (for the lower thread and gimp)
9. ERROR CODES......................... 219
<-01 specifications>.........................................................169
10. TROUBLESHOOTING ............. 225

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 1. MACHINE SPECIFICATIONS

1. MACHINE SPECIFICATIONS

Lower thread trimmer

Thread trimmer Long type Short type
-00 O - -
-01 O O -
1
-02* O - O
*1:
-02 specifications are divided into L1422 to L3422 specifications
depending on the sewing lengths, so please specify the sewing
length when ordering.
*2:
This is not covered by specification designations, but compatibility
is possible by replacement of gauge parts. (Ask the place of
purchase for details.)

SPECIFICATIONS RH-9820-00 RH-9820-01 RH-9820-02

Use Men’s clothes, ladies’ clothes Jeans and work clothes
Sewing speed 1,000 - 2,500 rpm (Setting possible in units of 100 rpm)
Without bartack Without bartack Without bartack
Taper bartack Taper bartack Taper bartack
Sewing shape Straight bartack Straight bartack Straight bartack
Round bartack Round bartack Round bartack
Circular stitch Circular stitch
2
L1422: 14 - 22 mm *
L1826: 18 - 26 mm
Eyelet buttonholes：8 - 50mm Eyelet buttonholes：8 - 42mm
Sewing length L2230: 22 - 30 mm
Straight buttonholes：5 - 50 mm Straight buttonholes：5 - 42 mm
L2634: 26 - 34 mm *2
2
L3442: 34 - 42 mm *
Stitch pitch 0.5 - 2.0 mm
Zigzag width 1.5 - 5.0 mm (Max. 4.0 mm with mechanism, Max. 1.0 mm with software)
Taper bartack length 0 - 20 mm
Work clamp height Standard 12 mm (up to 16 mm possible) 16 mm
Starting method Foot switch (treadle type, 2-pedal type) or hand start switch
Feed mechanism Intermittent feed by three pulse motors (X, Y, θ)
Needle DO x 558 80 - 120 Nm (Schmetz 558)
Safety devices Built-in emergency stop function and automatic stopping device which stops the machine when the
safety circuit is activated
Upper shaft motor AC servo motor (4-pole, 550 W)
Main regulator: 0.5 MPa
Air pressure
Hammer pressure regulator: 0.4 MPa
Air consumption 43.2 l/min (8 cycles/min)
Power supply Single-phase 100V/220V, Three-phase 200V/220V/380V/400V 400 VA
Weight Machine head: Approx. 120 kg, Operation panel: Approx. 0.6 kg
Control box: 14.2 - 16.2 kg (Varies depending on destination)

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 2. FUNCTION SETTINGS

2. FUNCTION SETTINGS
2-1. List of special functions when power is turned on
This section contains a list of functions and the key operations which are used to call the setting mode for the functions.
4421Q

Push the power switch at the ON side

to turn on the power.

5056Q

1 Memory switch setting mode (Standard) 6 Output checking function

Refer to the Instruction manual. Refer to “2-7. Output checking method”.

2 Memory switch setting mode (Advanced) 7 Software version display function

Refer to “2-3. Memory switch setting method (Advanced)”. Refer to “2-8. Software version checking method”.
3 Data initialization function 8 Data read/write mode

Refer to the Instruction manual. Refer to “3-3. Data read/write mode”.

4 Error log display function 9 Home position adjustment mode

Refer to “7-33. Adjusting the looper base home position”

“7-34. Adjusting the feed base X home position and Y
Refer to “2-5. Error history checking method”. home position”.
5 Input checking function 10 Upper shaft stop position adjustment mode

Refer to “2-6. Input checking method”. Refer to “7-36. Adjusting the upper shaft stop position”.
0676B - 0680B 0681B - 0685B

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 2. FUNCTION SETTINGS

2-2. List of advanced functions

This section contains a list of advanced functions and the key operations which are used to call the setting mode for the
functions.

4550Q

1 Production counter setting mode

Refer to the Instruction manual.

Data read/write mode

Refer to “3-3. Data read/write mode”.

0708B 0709B

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 2. FUNCTION SETTINGS

2-3. Memory switch setting method (Advanced)

The settings for the memory switches are valid for all programs.

1 While pressing the TEST key and the PROGRAM key, push the POWER switch at the ON side (1).
(A)

(B)

* The mode will switch to memory switch mode.

* The memory switch number (A) will appear in the top part of
the display, and the setting (B) for that number will appear in
the bottom part of the display.
0598B 0322B

2 Select the number (A) for the memory switch that you would like to change the setting for.

(A)

(B)

* If you press and hold the F key while pressing the or key at this
time, only the memory switches whose current setting values are
0413B
different from the default values will appear. 0323B

3 Change the memory switch setting (B).

* If you would like to return the setting which is currently being displayed
to the default value, press the RESET key.
* If the memory switch setting is different from the original setting, the
display will flash.
0414B

4 Apply the changed setting.

The setting for the memory switch will be stored and (B) will stop flashing
and illuminate steadily.

NOTE:
The changed settings will be enabled after memory switch mode has been
0415B
exited.

5 Repeat steps 2 to 4 above to change other memory switch settings.

6 [To exit memory switch mode]

Normal sewing machine operation will then be possible.

0448B

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 2. FUNCTION SETTINGS

2-4. List of memory switch settings

Memory switches which have a “*” in the default value column (050, 752, 850, 851, 852 and 853) are ignored when memory
switch initialization is carried out.
The settings for these memory switches are only changed when the ENTER key is pressed in memory switch mode.

For operator
Setting Default
No. Setting items
range value
Switching between 1-pedal and 2-pedal operation
* Displayed when using a hand start switch or 2-pedal foot switch
When the start switch is pressed, the work clamp is lowered and the sewing machine
001 1 2
starts.
When the start switch is pressed, the work clamp is lowered.
2
After that, the sewing machine starts operating when the start switch is pressed.
F key assignment
OFF The Help screen is displayed while the F key is being pressed.
300 OFF
Operates as a 7th shortcut key.
1 - 40
* The numerals indicate the parameter numbers.
Parameter checking column (1) in automatic mode

301 1 Shows the sewing length. 1

2 Shows the sewing pitch. (1)
0222B
Parameter checking column (2) in automatic mode

302 3 Shows the sewing speed. (2) 3

4 Shows the number of stitches. 0222B

Display screen contrast

303 15
0 - 30 The higher the value, the greater the contrast.
Number of eyelet buttonholes when the fly indexer is used
* This is displayed when the fly indexer is enabled.
500 2
The number of eyelet buttonholes can be set.
2-9
* If the number of buttonholes is 5 or more, a cloth feed bar (sold separately) is required.
Fly setting position when the fly indexer is used
* This is displayed when the fly indexer is enabled.
501 The material (fly) setting position is always at the left edge. 2
1
After sewing is finished, the cloth feed bar returns to the left edge.
2 The material (fly) setting position repeatedly alternates between the left and right edges.

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 2. FUNCTION SETTINGS

Work clamp settings

Setting Default
No. Setting items
range value
Sewing machine starting procedure
* This is not overwritten by CF card data.
050 *
Hand start switch or 2-pedal foot switch
Treadle
Delay time for 1-pedal operation when cutting before sewing is set (ms)
* This is displayed when 1-pedal operation is being used.
051 When carrying out automatic sewing with cutting before sewing, the hammer operates 0
0 - 800 only after the set delay time has passed.
Setting can be carried out in units of 50 ms.
Work clamp operating position for treadle
* This is displayed when treadle operation is being used.
052 115
When a smaller value is set, the amount that the treadle is depressed to reach the work
105 - 125
clamp operating position becomes smaller.
Sewing machine starting position for treadle
* This is displayed when treadle operation is being used.
053 155
When a smaller value is set, the amount that the treadle is depressed to reach the
135 - 175
sewing machine starting position becomes smaller.
Work clamp raising operation position for treadle
* This is displayed when treadle operation is being used.
054 75
When a larger value is set, the amount that the treadle is depressed backward to reach
65 - 85
the work clamp raising operating position becomes smaller.
Work clamp operation standby for treadle
* This is displayed when treadle operation is being used.
After the work clamp has been lowered, the work clamp is raised when the treadle is
OFF
055 moved to the neutral position. OFF
After the work clamp has been lowered, the work clamp is held in the lowered position
ON even when the treadle is moved to the neutral position, and the work clamp is raised
when the treadle is depressed backward.
Work clamp down operation when feed base is forward
When the feed base moves to the forward setting position after sewing is finished, the
OFF
work clamp moves while it is still raised.
056 OFF
When the feed base moves to the forward setting position after sewing is finished, the
ON work clamp moves while being lowered at the same time, and once the work clamp
finishes moving, it is raised.
Work clamp raising allowed during test feeding
OFF Raising of the work clamp is not allowed during test feeding.
The work clamp can be raised during test feeding when the following operations are
carried out.
(A) For hand start switch or 2-pedal foot switch operation: Press the work clamp switch.
057 (B) For treadle operation: Depress the treadle backward. OFF
ON
When test feeding is carried out again, the following operations must be carried out to
lower the work clamp.
(A) For hand start switch or 2-pedal foot switch operation: Press the work clamp switch.
(B) For treadle operation: Depress the treadle.
Work clamp operation after automatic sewing is finished
OFF After automatic sewing is finished, work clamp is raised.
After automatic sewing is finished, work clamp remains lowered.
058 To raise the work clamp, carry out the following operations. OFF
ON (A) For hand start switch or 2-pedal foot switch operation: Press the work clamp switch.
(B) For treadle operation: Depress the treadle backward.
* When using the fly indexer, this function is disabled.

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 2. FUNCTION SETTINGS

Upper shaft control settings

Setting Default
No. Setting items
range value
Needle up stop when operation is paused
150 OFF Upper shaft stops immediately when sewing is paused. ON
ON Upper shaft stops at needle up stop position when sewing is paused.
Upper shaft speed correction (rpm)
151 Correction can be carried out with respect to the setting speed. 0
-30 - 30
Setting can be carried out in units of 10 rpm.
Upper shaft final stitch speed (rpm)
152 The speed for the final stitch can be set. 800
700 - 900
Setting can be carried out in units of 10 rpm.
Upper shaft speed immediately before stopping (rpm)
153 The speed immediately before stopping can be set. 350
250 - 450
Setting can be carried out in units of 10 rpm.
Current limit value during upper shaft acceleration
154 8
1-8 When a larger value is set, a larger amount of current flows during acceleration.
Current limit value during upper shaft deceleration
155 1
1-8 When a larger value is set, a larger amount of current flows during deceleration.
Upper shaft stopping distance (°)
156 When a larger value is set, the interval for stopping control becomes longer. 11
2.5 - 17.5
Setting can be carried out in units of 0.5°.
Brake release speed when upper shaft stops
157 3
1-5 When a larger value is set, the brake is released more quickly.

NOTE:
Do not change the settings for Nos. 151 - 157 unless specifically instructed to by the manufacturer.

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 2. FUNCTION SETTINGS

Feed control settings

Setting Default
No. Setting items
range value
Feed timing correction (°)
250 When a smaller value is set, the feed timing is advanced. 0
-20 - 20
Setting can be carried out in units of 2°.
Automatic upper shaft deceleration to emphasize feeding
OFF Normal
251 The proportional feed time for each stitch is reduced from normal in order to prevent OFF
ON needle deflection.
* This may be limited by the sewing speed.
Y axis test feeding speed correction when feed base changes to forward setting (Hz)
When a smaller value is set, the test feeding speed in the Y axis direction becomes
252 -2500
-3500 - 0 slower.
Setting can be carried out in units of 100 Hz.
X axis test feeding speed correction (Hz)
When a smaller value is set, the test feeding speed in the X axis direction becomes
253 0
-300 - 0 slower.
Setting can be carried out in units of 50 Hz.
Y axis test feeding speed correction (Hz)
When a smaller value is set, the test feeding speed in the Y axis direction becomes
254 0
-2500 - 0*1 slower.
Setting can be carried out in units of 50 Hz.
θ axis test feeding speed correction (Hz)
255 When a smaller value is set, the test feeding speed in the θ axis direction becomes 0
-500 - 0 slower.
Setting can be carried out in units of 50 Hz.
Number of home position start cycles
256 OFF After sewing is finished, home position detection is not carried out. OFF
1-9 Home position detection is carried out for the number of sewing cycles set.
X axis home position detection speed correction (ms)
When a larger value is set, the home position detection speed in the X axis direction
257 0
0 - 2.0 becomes slower.
Setting can be carried out in units of 0.1 ms.
Y axis home position detection speed correction (ms)
When a larger value is set, the home position detection speed in the Y axis direction
258 0
0 - 2.0 becomes slower.
Setting can be carried out in units of 0.1 ms.
θ axis home position detection speed correction (ms)
259 When a larger value is set, the home position detection speed in the θ axis direction 0
0 - 2.0 becomes slower.
Setting can be carried out in units of 0.1 ms.
*1… If the version of the main control program (MN) is 1.0.00, the range will be “-1000 to 0”.

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 2. FUNCTION SETTINGS

Panel operation settings

Setting Default
No. Setting items
range value
Disabling program mode
OFF Normal
350 OFF
Switching to program mode is disabled.
ON
Shortcut keys are also disabled.
Disabling cycle program mode
351 OFF Normal OFF
ON Switching to cycle program mode is disabled.
Disabling changing of production counter
352 OFF Normal OFF
ON Changing the production counter is disabled.
Disabling changing of sewing speed
353 OFF Normal OFF
ON Changing the sewing speed (parameter No. 01) is disabled.
Disabling changing of program number
OFF Normal
354 OFF
Changing the program number is disabled.
ON
* However, the steps in cycle programs can be changed.
Disabling changing to cutting before sewing
OFF Normal
355 Changing to cutting before sewing is disabled. OFF
ON * If cutting before sewing is the current setting before this is changed, the setting will
change automatically to no cutting.
Disabling changing to cutting after sewing
OFF Normal
356 Changing to cutting after sewing is disabled. OFF
ON * If cutting after sewing is the current setting before this is changed, the setting will
change automatically to no cutting.

User program settings

Setting Default
No. Setting items
range value
Maximum sewing speed (rpm)
450 A limit to the maximum sewing speed can be set. 2500
1000 - 2500
Setting can be carried out in units of 100 rpm.
Maximum number of cycle programs
451 The number of effective cycle programs can be set. 9
0-9
* If cycle programs are never used, it can be useful to set this to 0.
Production counter when using cycle programs
452 OFF The counter is updated each time a buttonhole is sewn. OFF
ON The counter is updated each time a single cycle is completed.
Maximum cutting space (mm)
This sets the maximum value for the cutting space.
453 * If setting this to 0.8 mm, adjust so that the needle plate and the throat plate do not 0.5
0.5 - 0.8
interfere with each other. (Refer to “7-20. Adjusting the positions of the work clamp
plates”.)
Maximum straight bartack length (mm)
This sets the maximum straight bartack length.
454 * If setting this to 9 mm, adjust so that the needle plate and the throat plate do not 6
6-9
interfere with each other. (Refer to “7-20. Adjusting the positions of the work clamp
plates”.)
Additional zigzag width when no cutting is set (mm)
When sewing using no cutting, the value set here is added automatically to the zigzag
455 0
0 - 1.0 width.
Setting can be carried out in units of 0.1 mm.

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 2. FUNCTION SETTINGS

Device settings
Setting Default
No. Setting items
range value
Hammer on time (ms)
When a larger value is set, the period of contact between the hammer and the knife
becomes longer.
550 25
25 - 200 Setting can be carried out in units of 5 ms.
Note: If this is set to a larger value than necessary, it will shorten the useful life of
the hammer and the knife.
Hammer home position recognition height
In the standby condition, an error (E650) will occur if the value which is read by the
551 160
150 - 170 hammer position sensor is less than this value.
* This setting is enabled when hammer home position error checking is enabled.
Hammer home position error checking
Hammer home position error checking disabled
552 OFF ON
* This is used when there is a problem with the hammer position sensor.
ON Hammer home position error checking enabled
Verification of hammer raised position using timer (ms)
Verification of the hammer raised position is carried out based on the hammer position
OFF
sensor.
553 OFF
Verification of the hammer raised position is carried out based on the timer.
50 - 500 Setting can be carried out in units of 50 ms.
* This is used when there is a problem with the hammer position sensor.
Verification of hammer lowered position using timer (ms)
Verification of the hammer lowered position is carried out based on the hammer position
OFF
sensor.
554 OFF
Verification of the hammer lowered position is carried out based on the timer.
100 - 500 Setting can be carried out in units of 100 ms.
* This is used when there is a problem with the hammer position sensor.
Upper thread remaining amount increase (mm)
OFF Normal
555 By delaying the upper thread trimming timing by the amount set, it is possible to increase OFF
1-3 the amount of upper thread remaining from normal.
Setting can be carried out in units of 1 mm.
Upper thread tension release off timing (ms)
* This is only displayed for -00 and -01 specifications.
When a larger value is set, the upper thread release off timing is delayed after upper
556 50
thread trimming.
0 - 100
Setting can be carried out in units of 2 ms.
* This is only enabled for -00 and -01 specifications.
Upper thread tension release off timing (ms)
* This is only displayed for -02 specifications.
When a larger value is set, the upper thread release off timing is delayed after upper
557 50
thread trimming.
0 - 100
Setting can be carried out in units of 2 ms.
* This is only enabled for -02 specifications.
Disabling use of lower thread trimmer
* This is only displayed for -01 and -02 specifications.
558 OFF Normal (lower thread trimmer operates) OFF
Operation of the lower thread trimmer is disabled.
ON
* This is only enabled for -01 and -02 specifications.
Verification of lower thread trimming off using timer (ms)
* This is only displayed for -01 and -02 specifications.
Verification that the lower thread trimmer is off is carried out based on the lower thread
OFF
trimming off sensor.
559 OFF
Verification that the lower thread trimmer is off is carried out based on the timer.
Setting can be carried out in units of 5 ms.
5 - 50
* This is used when there is a problem with the lower thread trimming off sensor.
* This is only enabled for -01 and -02 specifications.

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 2. FUNCTION SETTINGS

Setting Default
No. Setting items
range value
Lower thread trimming timing (ms)
* This is only displayed for -02 specifications.
560 When a larger value is set, the lower thread trimming timing is delayed by more. 0
0 - 100 Setting can be carried out in units of 5 ms.
* This is only enabled for -02 specifications.
Upper thread breakage detector (option)
* This is not overwritten by CF card data.
561 OFF
OFF Upper thread breakage detector is disabled.
ON Upper thread breakage detector is enabled.
Number of stitches before upper thread breakage is detected
562 * This is displayed when the upper thread breakage detector is enabled. 5
1-9 Upper thread breakage detection starts after the set number of stitches has been sewn.
Number of stitches for upper thread breakage judgment
563 An upper thread breakage error occurs when the upper thread breakage signal is 4
2-7
continuously on for the set number of stitches.
Upper thread nipper device (option)
* This is not overwritten by CF card data.
564 OFF
OFF Upper thread nipper device is disabled.
ON Upper thread nipper device is enabled.
Upper thread nipper device closing timing correction (mm)
* This is displayed when the upper thread nipper device is enabled.
565 0
When a larger value is set, the upper thread nipping timing is delayed by more.
-10 - 10
Setting can be carried out in units of 1 mm.
Lapel device (option)
* This is not overwritten by CF card data.
OFF Lapel device is disabled.
566 OFF
Lapel device is enabled.
ON * When a straight buttonhole program is selected, the sub-hammer is lowered.
* The material setting position is automatically set to the forward position.
Program number loaded based on straight buttonhole sensor
* This is displayed when the lapel device is enabled.
567 OFF Normal OFF
When there is no material underneath the straight buttonhole sensor, the program
1 - 20
number which has been set is loaded, and the sub-hammer is lowered.
Program number for sub-hammer to be always lowered
* This is displayed when the lapel device is enabled.
OFF Normal
568 When the program number that has been set is sewn, the sub-hammer is always OFF
lowered.
1 - 20
* This is not affected by the status of the straight buttonhole sensor or the program
settings (eyelet pattern).
Error checking for straight buttonhole sensor
* This is displayed when the lapel device is enabled.
OFF Error checking disabled
Error checking enabled
569 An error (E942) occurs in the following cases. OFF
(A) When there is material underneath the sensor and an attempt is made to sew a
ON
straight buttonhole program
(B) When there is no material underneath the sensor and an attempt is made to sew an
eyelet buttonhole program

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 2. FUNCTION SETTINGS

Setting Default
No. Setting items
range value
Sub-hammer on time (ms)
* This is displayed when the lapel device is enabled.
When a larger value is set, the period of contact between the sub-hammer and the knife
570 becomes longer. 5
5 - 100 Setting can be carried out in units of 5 ms.
Note: If this is set to a larger value than necessary, it will shorten the useful life of
the sub-hammer and the knife.
No cutting operation using straight buttonhole sensor
OFF Normal
571 OFF
When sewing when there is no material underneath the straight buttonhole sensor, no
ON
cutting is carried out, regardless of the cutting operation setting on the panel.
Fly indexer (option)
* This is not overwritten by CF card data.
572 OFF
OFF Fly indexer is disabled.
ON Fly indexer is enabled.
* If No. 567 and No. 568 have both been set, only the setting for No. 567 will be enabled.
* If No. 567 and No. 569 have both been set, only the setting for No. 567 will be enabled.
* If No. 568 and No. 569 have both been set, both settings will be enabled.
* If No. 567 and No. 568 and No. 569 have all been set, only the setting for No. 567 will be enabled.

Error processing settings

Setting Default
No. Setting items
range value
Time before buzzer stops sounding (seconds)
OFF When an error occurs, the buzzer keeps sounding until the error is cleared.
650 OFF
When an error occurs, the buzzer sounds for the set time and then stops.
5 - 15
It can be set in units of 5 sconds.
Pulse motor energization status when a non-resettable error occurs
651 OFF When a non-resettable error occurs, pulse motor energization is turned off. OFF
ON When a non-resettable error occurs, pulse motor energization remains on.
Checking errors caused by box fan stopping
* The box fan is not currently installed.
652 OFF
OFF No checking of errors caused by box fan stopping.
ON Checking of errors caused by box fan stopping.

Assembly and maintenance settings

Setting Default
No. Setting items
range value
Continuous sewing permission
OFF Normal
750 OFF
Continuous sewing is allowed.
ON
Continuous sewing can be carried out by keeping the start switch pressed.
Continuous sewing interval (ms)
* This is displayed when continuous sewing is allowed.
751 1000
The continuous sewing interval can be set.
0 - 2500
Setting can be carried out in units of 100 ms.
X cutting position correction value (mm)
* This is not overwritten by CF card data.
752 *
The setting value is added as the X cutting position correction value for all programs.
-0.50 - 0.50
Setting can be carried out in units of 0.05 mm.

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 2. FUNCTION SETTINGS

Specifications and destination settings

Setting Default
No. Setting items
range value
Machine head specifications
* This is not overwritten by CF card data.
NOTE: Always be sure to set this to match the machine head specifications.
850 *
-00 Sets to -00 specifications.
-01 Sets to -01 specifications.
-02 Sets to -02 specifications.
Work clamp size
* This is only displayed for -02 specifications.
* This is not overwritten by CF card data.
NOTE: Always be sure to set this to match the work clamp specifications.
Sets to L1422 specifications.
L1422
The setting range for the sewing length will be 14 - 22 mm.
Sets to L1826 specifications.
851 L1826 *
The setting range for the sewing length will be 18 - 26 mm.
Sets to L2230 specifications.
L2230
The setting range for the sewing length will be 22 - 30 mm.
Sets to L2634 specifications.
L2634
The setting range for the sewing length will be 26 - 34 mm.
Sets to L3442 specifications.
L3442
The setting range for the sewing length will be 34 - 42 mm.
Circular stitch work clamp
* This is only displayed for -00 and -01 specifications.
* This is not overwritten by CF card data.
852 NOTE: Always be sure to set this to match the work clamp specifications. *
OFF When using a normal (not circular stitch) work clamp
When using a circular stitch work clamp
ON
Parameters only for circular stitches will be displayed when programming.
Language
* This is not overwritten by CF card data.
English
Japanese
Chinese
Spanish
German
853 *
French
The language can be selected from 12 available languages.
Italian
Turkish
Portuguese
Indonesian
Vietnamese (Ver. 1.1.00 or later)
Russian (Ver. 1.1.00 or later)
Sewing fold point correction value (mm)
OFF Normal
Straight buttonholes can be formed with the eyelet knife still installed.
854 At this time, the sewing fold point will be 6 mm forward of the normal point. OFF
6 In addition, the maximum sewing length for straight buttonholes will be 6 mm smaller
than normal.
* This is enabled when sewing straight buttonholes.

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 2. FUNCTION SETTINGS

2-5. Error history checking method

The past error history can be checked by the following procedure.

1 While holding down the key, push the POWER switch at the ON side (1).

(A)

The error history (A) will be displayed. (The display starting from the left
side will be: history number, error code and production counter.)

0979B 0718B

2 When the or key is pressed, the history numbers will change.

* Up to 64 history events can be recorded, starting from the latest to be

recorded. (No. 1 will be the latest error that has occurred.)
0413B

3 [To exit error history checking mode]

The sewing machine will change to home position detection standby.

0448B

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 2. FUNCTION SETTINGS

2-6. Input checking method

Use this to check for any malfunctions of the operation panel keys, circuit boards or sensors, and for checking for broken cords
and for adjusting sensor positions. This checks if the CPU is reading signals from the key and the sensor correctly.

1 Release the air.

2 While holding down the key, push the POWER switch at the ON side (1).

0980B The mode will switch to input checking mode. 0732B

3 Select the check number (A) to be checked.

(A)

0413B 0732B

4 Refer to the input check list for key and sensor responses.

5 [To return to normal operation]

Press the POWER switch at the OFF side to turn off the power, turn on the air, and then turn the power back on.

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 2. FUNCTION SETTINGS

<Input check list>

No. Check item Checking method Judgment
1 Power supply voltage → Normally around 100%
Move the feed base to the left and Left area: No switching ON/OFF
2 X axis home position sensor
right by hand. Right area: Switches ON/OFF
Left direction: Up
Move the feed base to the left and Right direction: Down
3 X axis encoder signal
right by hand. * When the power is turned on, the
position will be 0.
Move the feed base forward and Forward area: OFF
4 Y axis home position sensor
back by hand. Backward area: ON
Forward direction: Up
Move the feed base forward and Backward direction: Down
5 Y axis encoder signal
back by hand. * When the power is turned on, the
position will be 0.
Counterclockwise turning area: No
6 θ axis home position sensor Turn the looper base by hand. switching ON/OFF
Clockwise turning area: Switches ON/OFF
Counterclockwise direction: Up
Clockwise direction: Down
7 θ axis encoder signal Turn the looper base by hand.
* When the power is turned on, the
position will be 0.
When depressed backward: About 48
8 Treadle analog value Operate the treadle. When at neutral position: About 100
When depressed forward: About 190
ON: When pressed
9 Work clamp switch Press the work clamp switch.
OFF: When not pressed
ON: When pressed
10 Start switch Press the start switch.
OFF: When not pressed
STOP switch connection ON: Connected
11 →
signal OFF: Not connected
ON: When pressed
12 STOP switch Press the STOP switch.
OFF: When not pressed
ON: Normal condition
13 Machine head safety switch Tilt back the machine head.
OFF: Machine head is tilted back
14 Hammer position sensor → Normally around 190
Lower thread trimming OFF Turn the lower thread trimming ON: When cylinder is off
15
sensor cylinder on and off manually. OFF: When cylinder is on
ON: Fan is not operating
16 Fan lock detection signal →
OFF: Fan is operating
Turn the upper shaft pulley by ON: Inner zigzag
17 Zigzag sensor
hand. OFF: Outer zigzag
Turn the upper shaft pulley by ON: Raised
18 Needle up signal
hand. OFF: Not raised
Turn the upper shaft pulley by ON: Lowered
19 Needle drop signal
hand. OFF: Not lowered
Normal rotation: Up
Reverse rotation: Down
Turn the upper shaft pulley by * Normally within the range of 0 - 179.
20 Upper shaft encoder signal
hand. However, an unstable value may be
displayed just before a single rotation
is completed.

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 2. FUNCTION SETTINGS

No. Check item Checking method Judgment

21 key
22 key
23 ENTER key
24 Shortcut 1 key
25 Shortcut 2 key
26 Shortcut 3 key
27 Shortcut 4 key
28 Shortcut 5 key
29 Shortcut 6 key
30 AUTO key ON: When pressed
Press the corresponding key.
31 TEST key OFF: When not pressed
32 MANUAL key
33 CYCLE key
34 PROGRAM key
35 RESET key
36 THREAD key
37 FRONT/BACK key
38 BEFORE key
39 AFTER key
40 F key
Upper thread breakage Move the upper thread back and ON: No moving back and forth
41
detection signal forth inside the sensor. OFF: Moving back and forth
Straight buttonhole position Move the sub-hammer up and ON: When sub-hammer is lowered
42
sensor down by hand. OFF: When sub-hammer is raised
Eyelet buttonhole position Move the sub-hammer up and ON: When sub-hammer is raised
43
sensor down by hand. OFF: When sub-hammer is lowered
Place material underneath the ON: No material underneath sensor
44 Straight buttonhole sensor
straight buttonhole sensor. OFF: Material underneath sensor
Feed plate home position ON: Installed
45 Install the feed plate.
sensor OFF: Not installed
Feed plate drive cylinder left Turn the feed plate drive cylinder ON: When cylinder is off
46
sensor on and off manually. OFF: When cylinder is on
Feed plate drive cylinder Turn the feed plate drive cylinder ON: When cylinder is on
47
right sensor on and off manually. OFF: When cylinder is off
ON: Connected
48 External input signal 1 →
OFF: Not connected
ON: Connected
49 External input signal 2 →
OFF: Not connected
50 Sensor input 1 This is a spare signal for special orders.
51 Sensor input 2 (Applicable for main control program (MN) version 1.2.00 and later)

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 2. FUNCTION SETTINGS

2-7. Output checking method

Use this to check for any malfunctions of the circuit boards, and for checking for problems with drive mechanisms and broken
cords. This checks if the CPU output signal is working correctly.
NOTE:
When checking operation, the mechanisms may be obstructed and become damaged, so remove the left and right work clamp
plates (Z) before checking output.

0749B

1 While holding down the key, push the POWER switch at the ON side (1).

The sewing machine will switch to starting standby mode.

0981B

2 Press the start switch (2).

The feed base will move to the home position.

0982B

3 Select the check number (A) to be checked.

(A)

* Refer to the output check list for the details of signals being checked.
0413B 0731B

4 Press the start switch (2).

The operation corresponding to the signal being checked will be carried

out.

0982B

5 [To return to normal operation]

Press the POWER switch at the OFF side to turn off the power, and then turn the power back on.

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 2. FUNCTION SETTINGS

<Output check list>

No. Check item Operation
1 Work clamp The work clamp will be lowered while the start switch is being pressed.
2 Spreader The spreader will open while the start switch is being pressed.
Upper thread
3 The thread take-up lever will be lowered while the start switch is being pressed.
take-up
Lower tension The lower tension will be released for 0.1 seconds.
4
release * An error will not occur if the machine head is tilted back.
The gimp thread will be pressed for 0.1 seconds.
5 Gimp clamp
* -02 specifications only
The buzzer will sound for 0.7 second, and then the work clamp will be lowered, the
spreader will open and the feed base will move +20 mm in the Y axis direction. The feed
6 X-axis motor base will then oscillate in the X axis direction within a range of -6 mm to +6 mm.

It will stop when the start switch is released.

The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
spreader will open. The feed base will then oscillate in the Y axis direction within a range
7 Y-axis motor of 0 mm to +65 mm.

It will stop when the start switch is released.

The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
spreader will open. The looper base will then oscillate in the θ axis direction within a range
8 θ-axis motor of -49.5° to +364.5°.

It will stop when the start switch is released.

The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
upper shaft motor will start.
It will stop when the start switch is released.
The upper shaft encoder value (stop position) will be displayed immediately after the
upper shaft stops.
9 Upper shaft motor Normally a value of about 166 should be displayed.
The speed (1000 - 2500 rpm) can be changed using the and keys while the upper
shaft is stopped.
NOTE:
Remove the thread before carrying out this check in order to prevent needle
breakages.
The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
hammer will be lowered.
10 Hammer NOTE:
This operation is dangerous, so check to make sure that there are no hands or
other objects underneath the hammer before carrying out the check.
Upper thread The buzzer will sound for 0.7 second, and then the θshaft will turn 180° and upper thread
11
trimming trimming will turn on.
-01 specifications:
The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
spreader will open, and then theθshaft will turn 135° and lower thread trimming will
Lower thread
12 turn on.
trimming
-02 specifications:
The buzzer will sound for 0.7 second, and then the spreader will open, and then the
θshaft will turn 180°and lower thread trimming will turn on.
13 Buzzer The buzzer will sound while the start switch is being pressed.

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 2. FUNCTION SETTINGS

No. Check item Operation

14 Panel indicators The 11 panel indicators will illuminate one by one.
Upper tension
15 The upper tension will be released while the start switch is being pressed.
release
The buzzer will sound for 0.7 second, and then the work clamp will be lowered, the
spreader will open and the feed will move +20 mm in the Y axis direction. The feed will
then oscillate in the X axis direction within a range of -6 mm to +6 mm.
16 X axis encoder
It will stop when the start switch is released.
* Encoder offset is measured and displayed during operation.
The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
spreader will open. The feed will then oscillate in the Y axis direction within a range of 0
mm to +65 mm.
17 Y axis encoder
It will stop when the start switch is released.
* Encoder offset is measured and displayed during operation.
The buzzer will sound for 0.7 second, and then the work clamp will be lowered and the
spreader will open. The looper base will then oscillate in the θ axis direction within a range
of -49.5° to +364.5°.
18 θ axis encoder
It will stop when the start switch is released.
* Encoder offset is measured and displayed during operation.
Upper thread
The upper thread nipper device will be lowered while the start switch is being pressed.
19 nipper device
* Only with the upper thread nipper device
vertical movement
Upper thread
nipper device The upper thread nipper device will move forward while the start switch is being pressed.
20
forward/back * Only with the upper thread nipper device
movement
Upper thread
The upper thread nipper device will open while the start switch is being pressed.
21 nipper device
* Only with the upper thread nipper device
opening/closing
After the feed base has moved forward, the sub-hammer will be lowered.
22 Sub-hammer
* Only with the lapel device
Indexer feed plate
The feed plate auxiliary clamp arm of the fly indexer will turn on while the start switch is
auxiliary clamp
23 being pressed.
arm
* Only with the fly indexer
Indexer chuck The chuck of the fly indexer will turn on while the start switch is being pressed.
24
* Only with the fly indexer
The feed plate of the fly indexer will move to the right while the start switch is being
Indexer feed plate
25 pressed.
* Only with the fly indexer
26 Valve output 1
27 Valve output 2 This is a spare signal for special orders.
28 Valve output 3 (Applicable for main control program (MN) version 1.2.00 and later)
29 Valve output 4

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2-8. Software version checking method

1 While holding down the key, push the POWER switch at the ON side(1).

(A)

The control program versions (A) will be displayed.

MN … Main control program
MT … Motor control program
PL … Panel control program

When the F key is pressed, the IPL versions (B) will be displayed.

(B)

MN … Main IPL 0721B

0983B
0452B PL … Panel IPL 0710B

2 [To exit version checking mode]

The sewing machine will change to home position detection standby.

0448B

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 3. READING/WRITING DATA

3. READING/WRITING DATA
3-1. Precautions when handling CF cards (commercially available)
・ Use CF cards with a capacity of 32, 64, 128 or 256 MB.
・ Do not attempt to disassemble or modify the CF cards.
・ Do not forcibly bend, drop or scratch CF cards or place heavy objects on top of them.
・ Do not allow CF cards to come into contact with liquids such as water, oil, solvents or drinks.
・ Use and store the CF cards in places that are free from strong magnetic fields and electronic interference.
・ Do not use or store the CF cards in places which are subject to vibration, shocks, direct sunlight, dust from items such as
thread scraps, high humidity, sudden changes in temperature, or strong magnetic fields from equipment such as speakers.
・ Do not subject the CF cards to vibration or shocks or remove them from the sewing machine while data reading or writing is
in progress.
・ The data on the CF cards may become lost or corrupted due to some malfunction or accident. It is recommended that you
make backups of important data.
・ Be sure to turn off the power for the sewing machine before inserting and removing CF cards.
・ CF cards are already formatted at the time of purchase, so do not reformat them.
・ The recommended CF cards are commercially-available ones from SanDisk or HAGIWARA SYS-COM. CF cards from
other manufacturers can be used, but different formatting methods may mean that reading from or writing to such cards
may not be possible.

For more information, refer to the documentation provided with the CF card.

* This product is compatible with CF cards that have been formatted using the FAT16 method. Cards that have been
formatted using the FAT32 method cannot be used.
TM
* CF is a trademark of SanDisk Corporation.
* Company names and product names appearing in this manual are trademarks or registered trademarks of the
respective owners. However, no TM or other similar symbols appear in the main text of this manual.

3-2. Structure of a CF card folder

Data type Folder name Filenames

E*******.LDT ← Error log
M*******.LDT ← Memory switches
Error logs \BROTHER\ISM\ISMDC00\ISMLDT00\
* ****** is a name unique to the sewing
machine.
Memory switches \BROTHER\ISM\ISMDC00\ ISMMSW.SEW
Parameter data As above ISMUPG.SEW
Main control
\BROTHER\ISM\ISMSYS\ ISM03MN.MOT
program
Panel control
As above ISM03PL.MOT
program

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 3. READING/WRITING DATA

3-3. Data read/write mode

1 With the power turned off, insert the CF card into the CF slot.

Small holes

NOTE:
・ Make sure the CF card is facing the correct way.
(The side with the notches should be facing toward the left,
and the side with the small holes should be facing toward
the CF slot when the card is inserted.)
・ Always be sure to keep the cover closed except when
Notches inserting and removing the CF card. If this is not done,
dust may get inside and cause problems with operation.
0750B

2 While pressing the TEST key and the F key, push the POWER switch at the ON side(1). 0725B

The mode will switch to data read/write mode.

* You can switch to data read/write mode by pressing
the TEST key and the F key together, even when in
0984B
test mode.

3 Select the desired read/write code (A). (Refer to <Read/write code list> given below.)

(A)

0413B 0727B

4 [To exit data read/write mode]

0448B

<Read/write code list>

Code Setting items
R1 Parameter data is read from the CF card.
W2 Parameter data is written to the CF card.
R3 Memory switch settings are read from the CF card.
W4 Memory switch settings are written to the CF card.
R5 The main control program is read from the CF card and used to update the firmware version.
W6 The error log is written to the CF card.
R7 The panel control program is read from the CF card and used to update the firmware version.

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 3. READING/WRITING DATA

3-4. Reading parameter data from the CF card

1. Select R1 in data read/write mode.

2. Press the ENTER key.
The parameter data for all programs on the CF card will be read.
Once reading is complete, a “COMPLETED” message and the power off symbol
will be displayed.
0723B 3. Push the POWER switch to the OFF side to turn off the power, and then turn the
power back on again.

3-5. Writing parameter data to the CF card

1. Select W2 in data read/write mode.

2. Press the ENTER key.
The parameter data for all programs in the sewing machine will be written to the
CF card.
Once writing is complete, the buzzer will sound.
3. Press the TEST key.
0727B
Data read/write mode will end.

3-6. Reading memory switch data from the CF card

1. Select R3 in data read/write mode.

2. Press the ENTER key.
The memory switch data will be read from the CF card (except for some memory
switch data).
* Memory switch data relating to specifications and devices (050, 561, 564,
566, 572, 752, 850, 851, 852 and 853) will not be read.
0724B
Once writing is complete, a “COMPLETED” message and the power off
symbol will be displayed.
3. Push the POWER switch to the OFF side to turn off the power, and then turn the
power back on again.

3-7. Writing memory switch data to CF cards

1. Select W4 in data read/write mode.

2. Press the ENTER key.
All memory switch data from the sewing machine will be written to the CF card.
Once writing is complete, the buzzer will sound.
3. Press the TEST key.
Data read/write mode will end.
0728B

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 3. READING/WRITING DATA

3-8. Writing error log data to the CF card

1. Select W6 in data read/write mode.

2. Press the ENTER key.
The error log in the sewing machine will be written to the CF card.
The memory switch settings will also be written at this time.
However, the file destination will be different from the one mentioned in “3-7.”

0729B
above.
Once writing is complete, the buzzer will sound.
3. Press the TEST key.
Data read/write mode will end.

3-9. Updating the main control program

1. Select R5 in data read/write mode.

2. Press the ENTER key.
A confirmation message will be displayed.
3. Press the ENTER key. (If you press the RESET key, the operation will be
canceled.)
0725B Firmware updating will start. (It should take about one minute.)
Once writing is complete, an “UPDATED SUCCESSFULLY” message and the
power off symbol will be displayed.
4. Push the POWER switch to the OFF side to turn off the power, and then turn the
power back on again.

3-10. Updating the panel control program

1. Select R7 in data read/write mode.

2. Press the ENTER key.
A confirmation message will be displayed.
3. Press the ENTER key. (If you press the RESET key, the operation will be
canceled.)
Firmware updating will start. (It should take about three minutes.)
Once writing is complete, a “COMPLETED” message and the power off symbol
0726B
will be displayed.
4. Push the POWER switch to the OFF side to turn off the power, and then turn the
power back on again.

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 4. MECHANICAL DESCRIPTIONS

4. MECHANICAL DESCRIPTIONS
Each mechanism operates in the order of the numbers shown in the illustration.

* <number> indicate the flow of operations that occur separately from each other.

4-1. Upper shaft and Needle bar mechanisms

1. Motor assembly
2. Lower shaft
3. Upper shaft
4. Upper shaft crank 0658B

5. Needle bar crank

6. Crank rod unit
7. Needle bar clamp
8. Spacer
9. Needle bar

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 4. MECHANICAL DESCRIPTIONS

4-2. Zigzag and thread take-up mechanisms

0659B

1. Upper shaft
2. Hypoid gear
3. Orthogonal shaft

4. Zigzag cam <4> Roller take-up cam

5. Zigzag fork <5> Thread take-up roller
6. Zigzag connecting rod <6> Thread take-up
7. Zigzag crank
8. Zigzag driving lever
9. Zigzag lever
10. Zigzag horizon link
11. Needle bar block bracket
12. Needle bar block
13. Needle bar guide

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 4. MECHANICAL DESCRIPTIONS

4-3. Needle bar rocking mechanism

0660B
1. Pulse motor R
2. Theta M pulley assembly
3. Timing belt D

4. Looper pulley assembly <4> Driving looper shaft assembly

5. Looper base assembly <5> Vertical shaft timing pulley U assembly
<6> Timing belt U
<7> Needle bar gear block unit

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 4. MECHANICAL DESCRIPTIONS

4-4. Feed mechanism

<X direction>

1. Pulse motor X
2. Feed gear
3. Idler gear
4. X rack
5. X feed shaft holder N
6. X feed guide shaft A, B
7. X feed shaft holder S 0661B
8. Y feed guide shaft
9. Feed base

<Y direction>

0662B
1. Pulse motor Y
2. Driving gear 20
3. Idler gear
4. Timing pulley
5. Y Timing belt
6. Y driving shaft holder, Belt holder
7. Y shaft
8. Y bearing
9. Y guide shaft
10. Feed base

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 4. MECHANICAL DESCRIPTIONS

4-5. Presser foot mechanism

<When work clamp is lowered>

1. Clamp cylinder 16X10
2. Clamp cylinder rod
3. Clamp cylinder rod pin
4. Clamp driving lever
5. Clamp lever shaft
6. Clamp lever B
7. Clamp lever
8. Clamp arm
9. Work clamp

0663B

<When work clamp is raised>

Because the air is bled from the clamp cylinder, the force from the spring (1) has the opposite effect from when lowered.

1. Spring
2. Clamp cylinder 16X10
3. Clamp cylinder rod
4. Clamp cylinder rod pin
5. Clamp driving lever
6. Clamp lever shaft
7. Clamp lever B
8. Clamp lever
9. Clamp arm
10. Work clamp

0783B

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 4. MECHANICAL DESCRIPTIONS

4-6. Cloth opening mechanism

<After operation>

0664B

1. Opening cylinder assembly 16X15

2. Opening cylinder rod
3. Opening cylinder rod pin
4. Opening driving lever
5. Opening connecting rod
6. Slide block
7. Fulcrum lever plate
8. Rocker lever
9. Work clamp plate

a. Bolt
b. Extension spring
c. Opening stopper plate

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 4. MECHANICAL DESCRIPTIONS

4-7. Cutter mechanism

1. Cylinder 63X100
2. Cylinder rod
3. Cutter lever
4. Cutter link
5. Cutter arm assembly
6. Cutter arm slide block
7. Driving shaft presser
8. Cutter driving shaft
9. Hammer bracket assembly
10. Hammer

a. Knife bracket unit

b. Knife
c. Spring extension
0665B

4-8. Looper mechanism

1. Lower shaft
2. Lower shaft cam
3. Lower shaft cam collar
4. Looper lever assembly
5. Looper driving plate
6. Looper driving shaft
7. Looper link clamp
8. Looper link unit
9. LS holder base assembly
10. Looper

0666B

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 4. MECHANICAL DESCRIPTIONS

4-9. Spreader mechanism

1. Lower shaft
2. Lower shaft cam
3. Spreader lever A
4. Spreader lever B
5. Slide block
6. Spreader link shaft
7. Spreader link base
8. Spreader cam link
9. Spreader driving cam
10. Spreader

0667B

4-10. Upper thread trimmer mechanism

1. Upper thread trimmer cylinder

2. Hammer
3. Thread trimmer lever bracket
4. Upper movable knife

0668B

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 4. MECHANICAL DESCRIPTIONS

4-11. Upper tension release mechanism

0669B

1. Upper tension release solenoid

2. Bolt
3. Tension release pin

4-12. Upper thread take-up mechanism

0670B

1. Cylinder assembly 10-30

2. Cylinder joint A

3. Collar B <3> Rubber cushion

4. Thread take-up lever driving plate <4> Impact support shaft
5. Thread take-up lever plate <5> Spring compression A

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 4. MECHANICAL DESCRIPTIONS

4-13. Lower thread release and lower thread take-up mechanisms

<-01>

1. Lower thread tension release solenoid

2. Lower solenoid shaft
3. Lower thread take-up guide lever
(thread take-up)
4. Tension release pin (tension release)

<-00, -02：Lower thread release only >

1. Lower tension release solenoid

2. Lower solenoid shaft
3. Lower thread release plate
4. Tension release pin (tension release)

0671B

4-14. Gimp thread take-up mechanism <-01 specifications only>

1. Feed bar (Y direction operation)

0672B
2. Gimp thread take-up guide collar
3. Gimp thread take-up G-E plate
4. Gimp thread take-up guide plate

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 4. MECHANICAL DESCRIPTIONS

4-15. Lower thread trimmer mechanism

<-01>

0673B

Refer to “Principle of the

1. Cylinder assembly 16X30 B
thread handler” in “7-25-5.
2. Thread trimmer lever
Adjusting the thread handler”
3. Thread cutter lever arm
for details about the thread
4. Thread trimmer arm
handler [A].

<-02>

0674B

1. Cylinder 16X30 assembly B

2. Thread trimmer lever J assembly
3. Thread trimmer lever arm B
4. Movable knife driving plate

5. Thread trimmer link A assembly <5> Thread trimmer link B assembly

6. Movable knife L <6> Movable knife R

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 5. DISASSEMBLY

5. DISASSEMBLY
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the
wall outlet before opening the cover of the control box. Touching areas where high voltages are present
can result in severe injury.

CAUTION
Disassembly should only be carried out by a Use only the proper replacement parts as
qualified technician. specified by Brother.
Turn off the power switch and disconnect the If any safety devices have been removed, be
power cord at the following times. If this is not absolutely sure to re-install them to their
done, the sewing machine may operate if the original positions and check that they operate
start switch is pressed by mistake, which could correctly before using the machine.
result in serious injury. Any problems in machine operation which
Disconnect the air hoses from the air supply result from unauthorized modifications to the
and wait for the needle on the pressure gauge machine will not be covered by the warranty.
to drop to “0” before carrying out inspection,
adjustment and repair of any parts which use
the pneumatic equipment.
Be sure to wear protective goggles and gloves
when handling the lubricating oil and grease,
so that they do not get into your eyes or onto
your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the
grease under any circumstances, as they can
cause vomiting and diarrhea.
Keep the oil out of the reach of children.

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 5. DISASSEMBLY

Disassemble the parts in the order shown in the illustration.

5-1. Covers and presser foot mechanism

1079B

* Start with the machine head in its upright position.

1. Screw (Loosen) 14. Screws [4 pcs]
2. Needle 15. Needle guide cover
3. Screws [9 pcs] 16. Screws [5 pcs]
4. Top cover 17. Rear cover
5. Screws with washers [4 pcs] 18. Shoulder screw
6. Belt cover 19. Wave washer
7. Screws [2 pcs] 20. Zigzag window cover
8. Plain washers [2 pcs] 21. Work clamp plate R assembly
9. Eye guard 22. Work clamp plate L assembly
10. Screws [4 pcs]
11. Main plate (Tilt back the machine head.)
12. Socket bolts [2 pcs] 23. Screws [3 pcs]
13. Needle bar guard
24. Cam cover

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 5. DISASSEMBLY

5-2. Upper shaft motor unit mechanism

1080B

* Start with the machine head in its upright position.

1. Screws [2 pcs]
2. Belt guide
3. Socket bolts with washers [2 pcs]

(Tilt back the machine head.)

4. Socket bolt with washer [1 pcs]
5. Upper shaft motor unit

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 5. DISASSEMBLY

5-3. Feed mechanism

5-3-1. Feed base unit

1081B

* Carry out the following with the machine head in the upright position.
1. Screw (Loosen)
2. Hammer
3. Socket bolt (Loosen)
4. Knife
5. Truss screws [2 pcs]
6. Feed base cover U
7. Shoulder screws [2 pcs]
8. Bending washers [2 pcs]
9. Plate pressers [2 pcs]
10. Flat screws [12 pcs]
11. Feed base cover R
12. Feed base cover L
13. Socket bolts with washers
[2 pcs]
14. Set screws [4 pcs] (Loosen)
15. X feed guide shafts [2 pcs]
(Pull forward to remove)
16. Feed base unit

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 5. DISASSEMBLY

5-3-2. X feed unit

1082B

* Carry out the following with the machine head tilted back.
17. Socket bolts [3 pcs]
18. X feed assembly

5-3-3. Y feed unit

* Disassemble the “5-2. Upper shaft motor unit mechanism” before disassembling the “5-3-3. Y feed unit”.

1083B

* Start with the machine head in its upright position.

19. Socket bolt (Loosen) (Return the machine head to its
20. Y shaft holder upright position.)
22. Y shaft (Pull backward to remove)
(Tilt back the machine head.)
21. Socket bolt (Loosen) (Tilt back the machine head.)
23. Socket bolts [3 pcs]
24. Y feed assembly

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 5. DISASSEMBLY

5-4. Lower thread tension mechanism

1084B

* Carry out the following with the machine head tilted back.
1. Socket bolts [3 pcs]
2. Lower thread guide adjust assembly

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 5. DISASSEMBLY

5-5. Spreader mechanism

* Carry out the disassembly procedure in “5-4. Lower thread tension mechanism” before the disassembly
procedure in “5-5. Spreader mechanism”.

1085B

* Carry out the following with the machine head tilted back.
1. Screw
2. Tube support B
3. Screw (Loosen)
4. Set screws [2 pcs] (Loosen)
5. Spreader lever shaft
6. Screws [2 pcs]
7. Spreader lever B assembly
8. Spreader lever shaft
9. Spreader lever A assembly

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 5. DISASSEMBLY

5-6. Looper mechanism

* Carry out the disassembly procedure in “5-5. Spreader mechanism” before the disassembly procedure in
“5-6. Looper mechanism”.

1086B

* Carry out the following with the machine head tilted back.
1. Screw (Loosen)
2. Socket bolt (Loosen)
3. Looper driving shaft
4. Looper driving shaft bracket
5. Set screws [2 pcs] (Loosen)
6. Looper lever shaft
7. Looper lever assembly

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 5. DISASSEMBLY

5-7. Needle bar rocking mechanism

* Carry out the disassembly procedure in “5-2. Upper shaft motor unit mechanism” before the disassembly
procedure in “5-7. Needle bar rocking mechanism”.

1077B
* Start with the machine head tilted back.
1. Socket bolts with washers (Return the machine head to its
[2 pcs] upright position.)
2. Tension pulley D assembly 8. Socket bolts with washers
3. Socket bolts [2 pcs]
[2 pcs]
4. Motor stopper 9. Tension pulley U assembly
5. Socket bolts with washers 10. Socket bolt (Loosen)
[4 pcs]
11. Set screws [2 pcs] (Loosen)
6. Pulse motor assembly R
7. Timing belt D (Tilt back the machine head once
more.)
12. Driving looper shaft assembly
13. Vertical shaft timing pulley U
assembly
14. Timing belt U

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 5. DISASSEMBLY

5-8. Looper base mechanism

* Carry out the disassembly procedure in “5-5. Spreader mechanism” and the “5-6. Looper mechanism”
before the disassembly procedure in “5-8. Looper base mechanism”.

1078B

* Carry out the following with the machine head tilted back.
1. Socket bolts [2 pcs]
2. Partition
3. Screw (Loosen)
4. Looper pulley (screw type)
5. Looper base unit

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 5. DISASSEMBLY

5-9. Needle bar mechanism

* Carry out the following with the

machine head in the upright
position.
1. Socket bolts [4 pcs]
2. Slide block guide F
3. Screws [2 pcs]
4. Needle bar guide support
plates [2 pcs]
5. Needle bar guide springs
[2 pcs]
6. Needle bar guides [2 pcs]
7. Plain washers [2 pcs]
8. Set screws [2 pcs] (Loosen)
9. Needle bar guide collars
[2 pcs]
10. Set screw
11. Shoulder screw
12. Tension spring, Needle thread
holder plate, Needle guide A
13. Screws [2 pcs] (Loosen)
14. Needle bar assembly
(Pull out from the top)
15. Needle bar clamp [2 pcs]
16. Washers [2 pcs]
17. Rubber cap
18. Set screws [3 pcs] (Loosen)
19. Needle bar crank, Crank rod
unit
20. Slide block
21. Socket bolts [5 pcs]
1088B
22. Slide block guide D
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 5. DISASSEMBLY

5-10. Lubrication

1089B

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 5. DISASSEMBLY

1. Screw 22. Oil gauge window

2. Cord holder 23. Screw
3. Felt 24. Cord holder #5
4. Screw 25. Screws [4 pcs]
5. Tube support B 26. Oil plate assembly
6. Felt 27. Screw
7. Felt 28. Cord holder (NK-3N)
8. Wick 29. Screw
9. Wick 30. Cord holder (4N)
10. Cord holders (7N) [4 pcs] 31. Screw
11. Screws [4 pcs] 32. Cord holder
12. Oil tube 33. Screw
13. Tube clip spring 34. Cord holder (NK-3N)
14. Socket bolts [2 pcs] 35. Socket bolts [2 pcs]
15. Sub-tank assembly 36. Tube support assembly
16. Screw
17. Cord holder (NK-3N) (From this point on, disassemble
18. Screws [3 pcs] after the disassembly in “5-13.
19. Cord holders #10 [3 pcs] Cutter mechanism” has been
20. Lower shaft cover done.)
assembly
37. Socket bolt
21. Felt
38. Tube guide
39. Felt assembly

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 5. DISASSEMBLY

5-11. Zigzag and thread take-up mechanisms

* Carry out the following with the

machine head in the upright position.
<Zigzag mechanism>
1. Screw (Loosen)
2. Needle bar block bracket
(screw type)
3. Set screws [2 pcs] (Loosen)
4. Zigzag cam (Slide to remove
from zigzag fork.)
5. Set screws [2 pcs] (Loosen)
6. Zigzag coaxial rock shaft
1090B
(Pull out)
7. Spacer
8. Set screw (Loosen)
9. Zigzag fork support shaft
(Pull out)
10. Zigzag unit (Remove the whole
unit from the side of the arm
main plate.)
11. Needle bar block collar

<Thread take-up mechanism>

12. Set screw (Loosen)
13. Thread take-up L support shaft
(Pull out)
14. Thread take-up lever unit
(Remove the roller from the
grooved cam and lift upward.)
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 5. DISASSEMBLY

5-12. Upper shaft mechanism

1091B

* Carry out the following with the machine head in the upright position.
1. Screw 11. Pulley
2. Set screw (Loosen) 12. Set screws [2 pcs] (Loosen)
3. Set screws [2 pcs] 13. Set screws [2 pcs] (Loosen)
(Loosen) 14. Set screws [2 pcs] (Loosen)
4. Set screws [2 pcs] 15. Set screws [2 pcs] (Loosen)
(Loosen) 16. Orthogonal shaft unit
5. Set screws [2 pcs] (Pull out from the rear cover.)
(Loosen) 17. Pulley base
6. Set screws [2 pcs] 18. Take-up cam roller
(Loosen) 19. Gear
7. Upper shaft unit 20. Zigzag cam
(Pull out from the back.)
8. Pinion
9. Screws [3 pcs]
10. Plain washers [3 pcs]

NOTE:
The bearing unit (16) and the bearing inner rings <A> and <B> are joined with adhesive, so avoid
disassembling them if possible.

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5-13. Cutter mechanism

1092B

* Start with the machine head in its upright position.

1. Screws [2 pcs] (Tilt back the machine head.)
2. Cutter sensor assembly 14. Set screws [2 pcs] (Loosen)
3. Set screws [2 pcs]
15. Cylinder support shaft (Pull out)
(Loosen)
4. Cutter arm pin (Pull out) (Return the machine head to the
5. Set screw (Loosen)
upright position once more.)
6. Cylinder rod shaft
(Pull out) 16. Cylinder assembly
7. Set screw (Loosen) (Lift up to remove)
8. Cutter lever shaft 17. Socket bolts [4 pcs]
(Pull out) 18. Hammer bracket assembly
9. Cutter lever assembly 19. Socket bolts [3 pcs]
10. Set screws [2 pcs] 20. Cutter driving shaft unit
(Loosen) (Pull down to remove)
11. Set screws [2 pcs] 21. Socket bolt
(Loosen) 22. Knife bracket unit
12. Cutter arm shaft (Pull out) 23. Eccentric pin
13. Cutter arm assembly

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 6. ASSEMBLY

6. ASSEMBLY
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the
wall outlet before opening the cover of the control box. Touching areas where high voltages are present
can result in severe injury.

CAUTION
Assembly should only be carried out by a Use only the proper replacement parts as
qualified technician. specified by Brother.
Turn off the power switch and disconnect the If any safety devices have been removed, be
power cord at the following times. If this is not absolutely sure to re-install them to their
done, the sewing machine may operate if the original positions and check that they operate
start switch is pressed by mistake, which could correctly before using the machine.
result in serious injury. Any problems in machine operation which
If the power switch needs to be left on when result from unauthorized modifications to the
carrying out some adjustment, be extremely machine will not be covered by the warranty.
careful to observe all safety precautions.
Disconnect the air hoses from the air supply
and wait for the needle on the pressure gauge
to drop to “0” before carrying out inspection,
adjustment and repair of any parts which use
the pneumatic equipment.
Be sure to wear protective goggles and gloves
when handling the lubricating oil and grease,
so that they do not get into your eyes or onto
your skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the
grease under any circumstances, as they can
cause vomiting and diarrhea.
Keep the oil out of the reach of children.

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 6. ASSEMBLY

・ Assemble each part in the order shown in the illustration.

・ Parts indicated by are part of the same assembly.

6-1. Cutter mechanism

* Carry out assembly steps <1> to <8> in “6-25. Lubrication and greasing and routing the oil tubes” before
carrying out the assembly in “6-1. Cutter mechanism”.
* Refer to the detailed descriptions on the next page for details on A to D in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Insert so
that the D
ground
surface
touches. A

Place onto the

cutter sensor pin
(18). B

Insert
Refer to “7-14. from
Adjusting the top of
axial play of arm.
the hammer”.

Adjust so that the cutter

driving shaft (2) turns
smoothly with no play, and <For -00, -01,
then fully tighten the two -02-L2634,
<For L3442
socket bolts (4).
-02-L1422, specifications>
L1826, L2230
specifications>

Refer to “7-16-2.
Making fine adjustments
to the knife position”.
Install so
that it is
not
twisted.

<Used with
-02-L1422, L1826,
L2230 specifications>

0785B

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 6. ASSEMBLY

1. Bush cutter lever shaft 18. Cutter sensor pin 36. Cutter arm pin
19. Set screw 37. Set screws [2 pcs]
2. Cutter driving shaft 20. Cutter arm slide block 38. Hammer bracket assembly
3. Guide block 21. Cutter arm pin 39. Socket bolts [4 pcs]
4. Socket bolts [2 pcs] 22. Set screws [2 pcs] 40. Knob screw
(Temporarily tighten) 23. Cutter arm (Temporarily tighten)
5. Bolts [2 pcs] 41. Cutter sensor assembly
6. Nuts [2 pcs] 24. Cutter arm shaft 42. Screws [2 pcs]
7. Extension spring 25. Set screw collar 43. Eccentric pin
8. Spring hook pin U 26. Set screws [2 pcs] 44. Knife garbage joint
9. Driving shaft presser 27. Set screws [2 pcs] 45. Block stopper plate
10. Spring hook pin D 46. Screw (Temporarily tighten)
11. O Ring 28. Cutter link 47. Knife block holder
12. Bush cutter shaft assembly 29. Cutter arm pin 48. Socket bolt
30. Set screws [2 pcs] (Temporarily tighten)
13. Socket bolts [3 pcs] 31. Cutter lever 49. Knife bracket
50. Knife trash tube
14. Cylinder rod 32. Cutter lever shaft 51. Socket bolts [3 pcs]
15. Cylinder 33. Set screw (Temporarily tighten)
34. Cylinder rod shaft
16. Cylinder support shaft 35. Set screw <-02-L1422, L1826, L2230
17. Set screw specifications only>
52. Hammer spacer
53. Set screw

A Apply adhesive (Threebond 1373B) to the outer circumference of the bush cutter lever shaft (1), and
then press-fit it within the press-fitting dimensions shown in the illustration so that the hole (A) is facing
directly downward.

0786B

B Assemble as shown in the C Tighten the Set screw (19) D Insert the cutter arm pin
illustration. so that the cutter sensor pin (29) so that the “-” side
(18) protrudes by about 1.0 protrudes from the end of
±0.5 mm. the lever by about 1.0±0.3
mm.
(When at maximum retraction)

0787B 0788B 0789B

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 6. ASSEMBLY

6-2. Needle bar mechanism (1)

* Refer to “Adjusting the pressure of the needle bar gear block” on the next page.

Push the needle bar gear block (5) in

as far as it will go. If it is not properly
inserted, oil leaks will occur.

Apply sealant (Threebond 1212) to the outer

circumference of the bearing.
* Apply a small amount of sealant evenly
over the outer circumference. If the sealant
is not applied evenly over the whole
surface, oil leaks will occur.

1. Bearing
2. Bearing

3. Pulley flange
4. Screws [4 pcs]
0790B 5. Needle bar gear block

6. Needle bar gear nut

7. Screw
8. Gear nut cover

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 6. ASSEMBLY

Adjusting the pressure of the needle bar gear block

Secure the needle bar gear nut (6), and then while pushing the needle bar gear block (5) with a force of 78.4 N,
tighten the screw (7).
NOTE:
If pressure is not applied, it will not be possible to adjust the turning center for the needle bar and looper
base, and this will cause problems with sewing such as skipped stitches.

0791B

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 6. ASSEMBLY

6-3. Zigzag mechanism

* Refer to the detailed descriptions on the next page for details on A and B in the illustration.

Refer to “7-2. Adjusting the zigzag width (stitch width).”

Adjust so
that there
is no play.
B

Adjust so that
there is no
play. Align the end
of the shaft
with the edge
of the arm.

Adjust so
A that there
Refer to “7-3. Check the
is no play.
Adjusting the direction of
zigzag base line installation.
position” when
fully tightening.

0849B

59 RH-9820

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 6. ASSEMBLY

1. Zigzag connecting rod 20. Needle bar block collar

assembly
2. Shoulder screw 21. Zigzag fork 28. Zigzag crank
3. Nut
4. Zigzag crank screw
5. Nut 22. Zigzag fork support shaft 29. Spacer
6. Plain washer 23. Set screw 30. Set screws [2 pcs]
7. Nut 31. Needle bar block bracket
(Temporarily tighten) 24. Wick 32. Screw
25. Felts [6 pcs]
8. Zigzag eccentric pin 26. Cap4
9. Needle position control 27. Zigzag coaxial rock shaft
plate assembly

10. Wicks [2 pcs]

11. Wick
12. Felts [4 pcs]
13. Felt
14. Zigzag horizon link
15. Zigzag lever

16. Needle bar clamp

17. Socket bolt
18. Zigzag driving lever
19. Socket bolt (Temporarily
tighten)

A Install the two wicks (10) and the wick (11) as shown in the illustration. Push in the felt (13) so that the
wick will not pull out, and then push in the four felts (12) so that they do not protrude from the end of the
shaft. After this, install the socket bolt (17) so that it faces as shown in the illustration.

Insert into the groove

and then tie.
Groove

Groove

0851B

B Install the wick (24) as shown in the illustration.

Next, push the six felts (25) into the end of the shaft so that they do not protrude.

0850B

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 6. ASSEMBLY

6-4. Upper shaft mechanism

* Refer to the detailed descriptions on pages 62 and 63 for details on A to C in the illustration.
* For parts with screw stops, install so that the screw at the front in the turning direction is at the screw stop
position.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

A B

B
C

C
A

A B

A Place against
the bearing
collar (15) and
then tighten.

Place the zigzag cam (24)

against the gear (25)
and then tighten.
Refer to “7-29.
B Adjustment of
the phase for
the take-up
roller cam”
when
A assembling.
0821B

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 6. ASSEMBLY

1. Bearing 11. Pinion 22. Retaining ring C

2. Bearing collar 12. Set screws [2 pcs] 23. Orthogonal shaft
13. Set screws [2 pcs] 24. Zigzag cam
3. Bearing 25. Gear
4. Upper shaft crank 14. Bearing 26. Take-up cam roller
15. Bearing collar 27. Pulley base
5. Screw 28. Set screws [2 pcs]
6. Set screw 16. Internal retaining ring 29. Set screws [2 pcs]
7. Upper shaft 17. Set screws [2 pcs] 30. Set screws [2 pcs]
18. Timing pulley assembly 31. Set screws [2 pcs]
8. Spacer 19. Set screws [2 pcs] 32. Set screws [2 pcs]
20. Bearing 33. Pulley
9. Bearing 21. Bearing 34. Plain washers [3 pcs]
10. Balance collar 35. Screws [3 pcs]

A The outer circumferences of the bearings touch the sewing machine arm and the orthogonal shaft (23)
touch the inside of the bearings, so avoid removing them if possible.
If removing them, apply adhesive (Threebond 1373B) to the outer circumferences of the bearings, and
apply adhesive (Threebond 1401) to the inside of the bearing on the orthogonal shaft (23). Be sure to
wipe away any excess adhesive from the bearings at this time to avoid letting the adhesive get inside
the mechanism.

B Upper shaft and orthogonal shaft pressure adjustment

<Adjusting the pressure of the upper shaft>
1) While pushing the upper shaft crank (4) in the direction of the arrow with a force of 98 N, push the bearing
collar (2) in the direction of the arrow with a force of 98 N, and then tighten the two set screws (12).

0822B

2) While pushing the upper shaft crank (4) in the direction of the arrow with a force of 29.4 N, push the end
of the balance collar (10) against the upper shaft crank (4) with a force of 29.4 N, and then tighten the two
set screws (13).

0823B

3) While pushing the end of the bearing collar (15) in the direction of the arrow with a force of 29.4 N, tighten
the two set screws (17).

0824B

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 6. ASSEMBLY

<Adjusting the pressure of the orthogonal shaft>

While pushing the pulley base(27) in the direction of the arrow with a force of 98 N, push the orthogonal shaft
(23) in the direction of the arrow with a force of 98 N, and then tighten the two set screws (28).
* This adjustment should be carried out immediately after applying adhesive to the orthogonal shaft (23) and to
the inside of the bearing (20) and (21).

0825B

C Hypoid gear installation adjustment

1) Set the gear (25) to the position shown in the illustration, and then tighten the two set screws (29). Align the
set screw (29) at the front in the turning direction with the screw stop on the orthogonal shaft (23). (The arrow
shows the direction of rotation.)

0826B

2) Align the marks on the pinion (11) and the gear (25) as shown in the illustration. Next, align the set screw (30)
at the front of the pinion (11) in the turning direction with the screw stop on the upper shaft (7), and then
provisionally tighten the two set screws (30) so that the pinion (11) can still move in the axial direction. (The
arrow shows the direction of rotation.)

0827B

3) Push the pinion (11) against the gear (25) and adjust the backlash so that it is 0.05 mm or less, and then fully
tighten the two set screws (30).
<Adjusting the backlash>
Adjust the backlash so that it is zero at the point where it is at a minimum when the gear (25) is turned a full
rotation.
NOTE:
If the amount of backlash is too small, the rotation torque will increase and this will cause the gear (25) to
become worn. Furthermore, if the amount of backlash is too large, the operating noise will increase, so be
sure to adjust the backlash correctly.

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 6. ASSEMBLY

6-5. Thread take-up mechanism

Insert the roller (4) into the groove in the thread take-up cam, and then insert the thread take-up L support
shaft (8).
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Insert the wick (1) into the groove, Apply adhesive (3M DP-125
wind it around and then tie it. clear) and then install.
* Be sure to wipe away any
excess adhesive.

Application location
0829B
Tie.
0830B

0828B

Push in the felt (10) so that the wick 1. Wick

(1) touches the thread take up lever 2. Oil tube
support shaft (8). 3. Fastening band
4. Roller
5. Roller shaft
6. Set screw
7. Thread guide
8. Thread take-up L support shaft
9. Set screw
0831B 10. Felt

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 6. ASSEMBLY

6-6. Needle bar mechanism (2)

* Refer to the detailed descriptions on pages 66 to 68 for details on A to F in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Refer to “7-30.
Adjusting the
needle bar and
looper base
turning center”
when fully
tightening.

Refer to “7-6. Adjusting the

height of the needle bar” when
A
fully tightening.
F

F
E

Install so that
the needle bar
moves up and
down smoothly
and the amount
of play when
the needle bar
turns is as small
as possible.

0832B

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 6. ASSEMBLY

1. Needle bar bush U 13. Slide block 27. Needle bar guide support
assembly 14. Crank rod unit plates [2 pcs]
2. Needle bar bush holder 15. Screw (Left-hand thread) 28. Screws [2 pcs]
base C 16. Set screws [3 pcs] (Fully 29. Needle bar bracket screws
3. Socket bolts [3 pcs] tighten) [2 pcs] (Temporarily tighten)
(Temporarily tighten) 17. Needle bar clamp 30. Needle guide A
18. Plain washer 31. Needle thread holder plate A
4. Oil plate 19. Plain washer 32. Tension spring
5. Screws [2 pcs] 20. Needle bar clamp 33. Shoulder screw
6. Oil stopper 21. Needle bar assembly L 34. Needle
7. Felt holder assembly (Insert from above) 35. Set screw, SM
8. Socket bolts [2 pcs] 22. Needle bar guide collars 36. Slide block guide F
9. Slide block guide D [2 pcs] 37. Socket bolts [4 pcs]
23. Set screws [2 pcs] 38. Needle bar guard
10. Socket bolts [5 pcs] 24. Needle bar guide washers 39. Socket bolts [2 pcs]
11. Needle bar crank [2 pcs]
12. Set screws [3 pcs] 25. Needle bar guides [2 pcs]
(Temporarily tighten) 26. Needle bar guide springs
[2 pcs]

A Be careful of the position of the hole (a) when assembling.

At face plate 0833B

B Make sure that the direction of the groove (b) C Align the white painted marks on the needle
is correct when assembling. bar block (c), needle bar guide washer (d) and
needle bar gear (e) before installing.

White
Thread path painted
hole is at the marks
back.

Viewed from the front 0834B 0835B

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 6. ASSEMBLY

D Slide block guide D installation

1) Provisionally tighten the four socket bolts (10)

so that the slide block guide D (9) can still
move.
2) While pushing the slide block guide D (9) gently
from the face plate side toward the arm
installation surface, tighten the fifth socket bolts
(10) (f) from the side of the arm.
3) Fully tighten the four socket bolts (10).

Face plate side Right side

0836B

E Slide block guide F installation

1) Provisionally tighten the three socket bolts (37)

so that the slide block guide F (36) can still
move.
2) While pushing the slide block guide F (36)
gently from the face plate side toward the arm
installation surface, tighten the fourth socket
bolts (37) (g) from the side of the arm.
3) Fully tighten the three socket bolts (37).

Face plate side Right side

0837B

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 6. ASSEMBLY

F Needle bar crank forward/back adjustment

1) Align the screw stop of the needle bar crank

(11) with the side where the two set screws (12)
are on the upper shaft crank (h) (where the set
screw (12) (j) is), and then provisionally tighten
the two set screws (12) (i) and (j) so that the
needle bar crank (11) can still move back and
forth.
2) Pull out the crank rod unit (14) slightly.
3) Push the place indicated by to gently push
the Slide block (13) against slide block guide D
(9) so that the upper shaft crank (h) can still
turn easily, then tighten the set screw (12) (j)
through the hole in the side of the arm, and
then tighten the other set screw (12) (i)”. After
this, turn the upper shaft crank (h) and
provisionally tighten the third set screw (12) on
the opposite side.

* After assembling, check that the upper shaft

crank (h) turns easily. If the slide block (13) is
pushed too firmly, the upper shaft torque will
become stiffer.

0838B

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 6. ASSEMBLY

6-7. Y feed mechanism

* Refer to the detailed descriptions on pages 70 to 72 for details on A to F in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .
NOTE:
After carrying out this procedure, be sure to adjust the Y home position while referring to “7-35. Adjusting
the needle up signal home position for the upper shaft and upper shaft motor”.

Assemble so that the

flanges are on the
inside.
F

Install so that the motor

Install the timing belt. B connectors are facing as

indicated by the arrow.

0839B
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 6. ASSEMBLY

1. Ball bearings [2 pcs] 14. Retaining rings C [2 pcs] 26. Socket bolts [2 pcs]
2. Ball bearing stoppers 15. Ball bearings [2 pcs] 27. Socket bolt
[2 pcs] 16. Retaining ring C (Temporarily tighten)
3. Screws [2 pcs] 17. Y pulley shaft R
4. Y position sensor 18. Y timing pulley assembly 28. Driving gear 20
5. Screw 19. Retaining ring C 29. Set screws [2 pcs]
20. Set screws [2 pcs] 30. Pulse motor Y assembly
6. Ball bearings [2 pcs] 21. Y pulley support
7. Retaining ring E 31. Washers [4 pcs]
8. Y pulley shaft F 22. Socket bolts with washers 32. Socket bolts [4 pcs]
9. Y timing pulley assembly [2 pcs] 33. Y feed base
10. Timing belt (Temporarily tighten)
11. Idler gear 40 23. Socket bolt 34. Socket bolts [3 pcs]
12. Set screws [2 pcs] (Temporarily tighten) 35. Y shaft
13. Set screws [2 pcs] 24. Y driving shaft holder 36. Y shaft holder
25. Belt holder 37. Socket bolt
38. Socket bolt

A
1) Push the Y pulley shaft F (8) and the Y timing
pulley assembly (9) in the direction of the arrow
so that there is no play in the parts, and then
tighten the two set screws (12).
2) Align the idler gear 40 (11) with the two set
screws (12) of the Y timing pulley assembly (9),
and then push it toward the side where the ball
bearing (6) are and tighten the two set screws
(13).

0840B

B Assemble as shown in the C Assemble as shown in the D Place the pulse motor Y
illustration. illustration. assembly (30) against the
idler gear 40 (11) so that
the amount of backlash is
0.03 mm or less, and then
tighten the four socket
bolts (32).

0841B 0842B 0843B

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 6. ASSEMBLY

E Belt tension adjustment

Repeat steps1 to 3 to adjust the belt tension until it
is within the ranges given below.
・ When using a new belt: 80 - 90 N
・ When reusing an old belt: 60 - 70 N

1) Loosen the two screws (b) of the Y pulley

support assembly (a).
2) Use the adjustment screw (c) to adjust the belt
tension.
3) Tighten the two screws (b) of the Y pulley
support assembly (a).

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
Measurement position shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 10 mm and a span length of 120 mm.

0844B
0845B

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 6. ASSEMBLY

F Standard installation of motor unit

<Y shaft and Y shaft holder installation positions>

Align the end (A) of the Y shaft holder (36) and
the reference line (B) on the Y shaft (35), and
then tighten the socket bolt (37).

0846B
0847B

<Y shaft and Y driving shaft holder installation positions>

Align the end (C) of the Y driving shaft holder
(24) and the reference line (D) on the Y shaft
(35), and then tighten the socket bolt (38).

Front

0848B
0847B

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 6. ASSEMBLY

6-8. Looper base mechanism

* Refer to the detailed descriptions on pages 75 to 78 for details on A to F in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Refer to “7-8.
Refer to “7-24-2. Adjusting Adjusting the
the upper movable knife”. needle guard”.

Refer to
“7-24-2. Refer to “7-1. Adjusting the heights of the
Adjusting spreaders and loopers” and “7-7. Adjusting
the upper the clearance between the loopers and
movable needle”.
knife”.

Refer to “7-11
Adjusting the
height of the
C
throat plate”.
Refer to “7-28.
Adjusting the position
of the lower thread
presser <-02
B
specifications only>”.

A
Refer to “7-24-3.
Adjusting the
position of the thread
trimmer lever
bracket”.

Longer
end
F
E

1093B
G I
K
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 6. ASSEMBLY

1. Wick 32. Shoulder screw <-00 and -01 specifications only>

62. Upper movable knife A
2. Spreader cam link 33. Spreader driving cam 63. Screw (Temporarily tighten)
3. Collar 64. Upper movable knife base
4. Shoulder screw 34. LS holder base 65. Screw (Temporarily tighten)
5. Screw
(Temporarily tighten) 35. Holder presser shaft <-02 specifications only>
6. Spreader link base 36. Set screw 66. Upper movable knife B
7. Shoulder screw 37. LS slide guide 67. Screw (Temporarily tighten)
38. Plain washer [2 pcs] 68. Spring
8. Wick 39. Nut 69. Screw
9. Wick 40. Screw (Temporarily tighten) 70. Nut
10. Eye looper 41. Thread trimmer lever 71. Lower thread presser J
11. Looper R bracket assembly
12. Spreader L 42. Pin 72. Screw (Temporarily tighten)
13. Spreader R 43. Support shaft base
14. Spreader stopper L 44. Socket bolts [2 pcs] 73. Looper base oil plate assembly
15. Spreader stopper R 45. Set screw 74. Screws [2 pcs]
16. Screw [4 pcs] 46. Spring
(Temporarily tighten) 47. Thread guide plate 75. Wick
17. Spring guide shaft 48. Spring guide shaft 76. Felt
18. Twist spring L 49. Nut 77. Fastening bands [2 pcs]
19. Twist spring R 50. Collar 78. Gimp thread waste plate
20. Needle guard U 51. L thread take-up spring
21. Plain washer support 79. Oil tube
22. Socket bolt 52. Screw (Temporarily tighten) 80. Cord holder
(Temporarily tighten) 53. Thread take-up spring 81. Screw
54. L thread take-up spring
23. Felt support <-00 specifications only>
24. Wick 55. Screw (Temporarily tighten) 82. Gimp thread guide C
25. Looper link 56. L thread take-up spring 83. Screw
26. Collar support
27. Shoulder screw 57. Screw with washer <-01 and -02 specifications only>
28. Plain washer 58. Vertical pin 84. Gimp thread clamp plate
29. Screw (Temporarily tighten) 59. Set screw 85. Collar
30. Looper link clamp (Temporarily tighten) 86. Spring
31. Collar 60. Throat plate 87. Plain washer
61. Screw (Temporarily tighten) 88. Screw
89. Gimp thread guide C
<Gimp thread guide C-J for -02
specifications>

90. Screw

91. Ball bearings [2 pcs]

92. Looper base
93. Looper pulley assembly
94. Screw

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 6. ASSEMBLY

A Tie one end of the wick (1) once, and then push that end into the hole (a) in the support shaft base (43).
* Push in so that the knot does not protrude from the hole (a).

(Viewed from the front) (Viewed from the right) 1184B

B
1) Tie one end of the wick (8) once, and then push that end into the hole (b) in the LS holder base (34).
* Push in so that the knot does not protrude from the hole (b).
2) Tie the other end of the wick (8) to one end of the wick (9), and then wind them around the LS holder
base (34) as shown in the illustration.
* Tie the wicks twice to form the knot.
* Wind so that the knot is directly below the hole (c) and so that it does not protrude to the outside.
* Wind the wick (8) and the wick (9) so that they are positioned as shown in the illustration.

(Viewed from the left) (Viewed from the front)

1185B

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 6. ASSEMBLY

C D
Hook the longer end of twist spring R (19) onto 1) Push the felt (23) into the hole in the looper link
spreader R (13), and pass the shorter end through (25).
the hole in the LS holder base (34) as shown in the 2) Tie the wick (24) around the looper link (25) as
illustration. shown in the illustration.
* Make a double knot in the wick (24), and
then cut off the excess length so that the
ends are 2 - 3 mm in length.

1094B 1095B

E F
Hook the thread take-up spring (53) onto the hook 1) Hook the wick onto the hook (e) of the L thread
(d) of the L thread take-up spring support (54) as take-up spring support (56) as shown in the
shown in the illustration. illustration.
2) Raise the end of the hook (e) of the L thread
take-up spring support (56) so that it touches the
support shaft base (43), and then tighten the
screw with washer (57) at that position.
* This will prevent the wick from pulling away.

1096B 1097B

RH-9820 76

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 6. ASSEMBLY

G
1) Tie the wick (75) around the wick release plate (78) as shown in the illustration.
* Make a double knot in the wick, and then set the wick so that the distance from the knot to the end is
as shown in the illustration, and cut off any excess length.
2) Install the felt (76) to the wick release plate (78) with the two cable ties (77).
* Cut the ends of the two cable ties (77) so that a length of 0 to 2 mm remains.

(Viewed from the front) (Viewed from the right)

1186B

H Pass the wick (9) and the wick (75) through the I Push the five wicks (g) into the hole (h) as
oil tube (79) as shown in the illustration, and shown in the illustration, and then install the
then pass them through the hole (f). cord presser (80) and secure it by tightening
the screw (81).

1187B 1188B

77 RH-9820

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 6. ASSEMBLY

J
1) Apply adhesive (Threebond 1373B) to the
outer circumferences of the two ball bearings
(91).

2) Insert the two ball bearings (91) into the top

and bottom of the looper base mounting hole
(i) in the bed.
* Insert the two ball bearings (91) securely
until their surfaces (j) are fully touching.
* Wipe away any excess adhesive at this
time.

3) Insert the looper base assembly (k).

1098B
1099B
1100B

K Looper base pressure adjustment

1) Gently screw the looper pulley assembly (93)
onto the threaded section (l) of the looper base.

2) Secure the looper pulley assembly (93) so that

it will not turn, and then push the back of the
looper base (92) at a point 20 mm to the left of
center with a force of 70 N.
3) Tighten the screw (94).

1101B

RH-9820 78

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 6. ASSEMBLY

6-9. Needle bar rocking mechanism

* Refer to the detailed descriptions on pages 80 to 84 for details on A to G in the illustration.

B E

0922B

79 RH-9820

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 6. ASSEMBLY

1. Bearing 11. Internal retaining ring 22. Timing belt

2. Set screws [2pcs] 12. Bearing 23. Motor stopper
(Temporarily tighten) 13. Internal retaining ring 24. Socket bolts [2 pcs]
3. Set screw collar 14. Tension pulley U
4. Bearing 15. Retaining ring C 25. Internal retaining ring
5. Internal retaining ring 16. Timing pulley holder 26. Bearing
6. Socket bolt (Temporarily assembly 27. Internal retaining ring
tighten) 28. Tension pulley
7. Vertical shaft timing pulley 17. Socket bolts with washers 29. Retaining ring C
U assembly [2 pcs] 30. Timing pulley holder assembly
8. Timing belt
9. Driving looper shaft 18. Theta M pulley assembly 31. Socket bolts with washers
assembly 19. Set screws [2 pcs] [2 pcs]
10. Rubber cap 20. Pulse motor assembly R

21. Socket bolts with washers

[4 pcs]

A Push the driving looper shaft B Place the timing belt (8) onto the needle bar gear block (a)
assembly (9) from the lowered to and the vertical shaft timing pulley U assembly (7).
the raised position, then push the
set screw collar (3) down to clamp
the bearing (4), and then tighten
the two set screws (2).

0923B 0924B

C Place the timing belt (22) onto the looper base D Align the screw (c) at the left side of the theta
(b), driving looper shaft assembly (9) and the M pulley assembly (18) with the screw stop on
theta M pulley assembly (18). the driving looper shaft assembly (9). In
addition, set the clearance between the theta M
pulley assembly (18) and pulse motor
assembly R (20) to 2 mm.

0925B 0926B

RH-9820 80

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 6. ASSEMBLY

E Belt tension adjustment for needle bar gear block belt

1) Place the timing belt (8) onto the needle bar

gear block (a) and the vertical shaft timing
Measurement position pulley U assembly (7), and then provisionally
install tension pulley U (14) so that it is gently
pressing against the timing belt (8).
2) Pull tension pulley U (14) in the direction of the
arrow to adjust the belt tension so that it is
within the ranges given below.
・ When using a new belt: 80 - 90 N
・ When reusing an old belt: 60 - 70 N

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 10 mm and a span length of 219 mm.

NOTE:
If you do not have a belt tension gauge, adjust
so that the amount of deflection is
approximately 3 mm when a pressure of 5 N is
applied to the middle of the span (the
0927B measurement position shown in the illustration).

81 RH-9820

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 6. ASSEMBLY

F Belt tension adjustment for driving looper belt

<Standard installation when belt is tensioned>

Attach the timing belt (22) so that the distance

from reference line (A) (for installation: 65 °
position) on the looper base (b) to reference line
(B) on the bed is 5 mm or less when (d) of the
theta M pulley assembly (18) is touching against
the motor stopper (23), and then adjust tension
pulley (28) to the appropriate tension.

<Belt tension adjustment>

1) Place the timing belt (22) onto the looper base
(b), driving looper shaft assembly (9) and theta
M pulley assembly (18), and then provisionally
install the tension pulley (28) so that it is gently
pressing against the timing belt (22).
2) Pull the tension pulley (28) in the direction of
the arrow to adjust the belt tension so that
it is within the ranges given below.
・ When using a new belt: 80 - 90 N
Measurement ・ When reusing an old belt: 60 - 70 N
Measurement
position position
3) Check that the mechanism is at the <Standard
installation when belt is tensioned> position
given above at this time. If the reference lines
are more than 5 mm apart, readjust the
mechanism.

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 10 mm and a span length of 136 mm.

NOTE:
If you do not have a belt tension gauge, use a
push-pull gauge to push tension pulley (28) in
the direction of the arrow with a force of 65
1197B
0928B
N, and then tighten the two socket bolts with
0929B washers (31).

RH-9820 82

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 6. ASSEMBLY

G Looper base and needle bar gear block position adjustment

1) Loosen the socket bolt (6) of the vertical shaft

timing pulley U assembly (7).
2) Turn the needle bar gear block (a) until the
socket bolt (6) of vertical shaft timing pulley U
assembly (7) is toward the front when the
thread guide (e) on the needle bar is at the
back.

3) Turn the looper base (b) until reference line (B)

on the bed is aligned with reference line (C) (0°:
left side) on the looper base.

4) Install the positioning gauge (f) to the end of

the needle bar gear block (a) with the screw
(g). (The thread guide (e) on the needle bar
should be all the way in [on the right side in
the illustration].)
* Install the positioning gauge (f) so that it is
pushed up to the top-left.

5) Turn the needle bar gear block (a) in the

direction of the arrow until the positioning
gauge (f) touches the end (h) of the cutter
driving bushing.
* The underside of the positioning gauge (f)
should touch the end (h).

0930B
0931B
1195B
1196B

83 RH-9820

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 6. ASSEMBLY

6) Push the vertical shaft timing pulley U assembly

(7) up gently until it touches the bearing (1),
and then tighten the socket bolt (6).

0932B

RH-9820 84

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 6. ASSEMBLY

6-10. Lower shaft mechanism

* Refer to the detailed descriptions on pages 86 to 89 for details on A to C in the illustration.

Press-fit into the arm

after assembling.
Press-fit into the arm
after assembling.

0933B

85 RH-9820

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 6. ASSEMBLY

1. Bearing 9. Lower shaft 20. Bearings [2 pcs]

2. Bearing collar 10. Set screws [2 pcs] 21. Retaining ring C
11. Set screws [2 pcs] 22. Tension pulley collar
3. Bearing 12. Set screws [2 pcs]
4. Bearing collar 23. Socket bolt (Temporarily tighten)
13. Internal retaining ring 24. Timing belt (For lower shaft -
5. Bearing 14. Bearings [2 pcs] upper shaft motor) (Temporarily
6. Lower shaft tension 15. Internal retaining ring tighten)
pulley A 16. Idler pulley 25. Timing belt
7. Lower shaft tension 17. Collar (For upper shaft - lower shaft)
pulley B 26. Lower shaft cover assembly
8. Socket bolts with 18. Idler pulley shaft 27. Screws [2 pcs]
washers [3 pcs] 19. Set screw 28. Lower shaft cam
29. Set screws [2 pcs]
(Temporarily tighten)

A Lower shaft pressure adjustment

1) Set so that the amount of protrusion is 24.8 mm, and then tighten the two set screws (10) of the bearing
collar (2) against the lower shaft (9). (This is to prevent the shaft from protruding when installing the lower
shaft cam (28).)
2) While pushing the lower shaft (9). in the direction of arrow (A) with a force of 29.4 N, tighten the two set
screws (11) of the bearing collar (4).
3) Push the back of lower shaft tension pulley B (7) gently in the direction of arrow (B) and tighten the two
set screws (12).

0934B

RH-9820 86

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 6. ASSEMBLY

B Belt (upper shaft - lower shaft) installation and belt tension adjustment

<If the belt (lower shaft – upper shaft motor) is not installed (if installing the upper shaft motor later)>

1) Place the timing belt (24) (for lower shaft –

upper shaft motor) into the groove (C) in lower
shaft tension pulley B (7).

2) Loosen the socket bolt (23) of the tension

pulley assembly (a).
3) Place the timing belt (25) (for upper shaft -
lower shaft) onto the upper shaft timing pulley
(b), idler pulley (16), lower shaft tension pulley
B (7) and tension pulley assembly (a).
Measurement position

4) Use a spanner to turn the hexagonal part (c) of

the eccentric shaft of the tension pulley
assembly (a) in the direction of the arrow to
adjust the belt tension to within the ranges
given below, and then tighten the socket bolt
(23).
・ When using a new belt: 170 - 190 N
・ When reusing an old belt: 140 - 170 N

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 15 mm and a span length of 198 mm.

NOTE:
If you do not have a belt tension gauge, adjust so
that the amount of deflection is approximately 2
mm when a pressure of 5N is applied to the middle
of the span (the measurement position shown in
0935B
0936B
the illustration).
0937B

87 RH-9820

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 6. ASSEMBLY

<If the belt (lower shaft – upper shaft motor) is installed (if the upper shaft motor is already installed)>

1) Turn the upper shaft pulley (d) to the needle up

stop position.
(Align the pulley groove (E) with the arm
reference line (D).)

2) Remove the face plate (e) and the rubber cap

(f), and then insert the accessory pin (g) into
the groove (G) of the crank from the hole (F) in
the arm to secure the upper shaft. (Upper shaft
0° position)

3) Hold the timing pulley (h) of the upper shaft

motor still with your hand so that the screw on
the timing pulley (h) is in the position shown in
the illustration, and then place the timing belt
(25) (for upper shaft - lower shaft) onto the
upper shaft timing pulley (b), idler pulley (16),
lower shaft tension pulley B (7) and tension
pulley assembly (a).

4) Use a spanner to turn the hexagonal part (c) of

the eccentric shaft of the tension pulley
assembly (a) in the direction of the arrow to
adjust the belt tension to within the ranges
Measurement position given below, and then tighten the socket bolt
(23).
・ When using a new belt: 170 - 190 N
・ When reusing an old belt: 140 - 170 N

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 15 mm and a span length of 198 mm.

0941B
0938B
0939B
0940B 1198B

RH-9820 88

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 6. ASSEMBLY

C Lower shaft provisional installation position

* This position is the provisional position for the lower shaft until the procedure in “7-5. Adjusting the looper
stroke” is carried out.

1) Turn the upper shaft pulley (d) to the needle up

stop position.
(Align the pulley groove (E) with the arm
reference line (D).)

2) Align the index mark (I) of the lower shaft cam

(28) with the hole (H) in the bed.

3) Push the lower shaft cam (28) against the end

of the bearing collar (2), and then provisionally
tighten the two set screws (29).

Should be no clearance. 0941B

0942B
0943B

89 RH-9820

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 6. ASSEMBLY

6-11. Looper mechanism

* Refer to the detailed descriptions on the next page for details on A in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .
Refer to “7-4. Adjusting
the needle and looper
timing”.

Check that
the looper
driving plate
(14) turns
smoothly
through 360°
with no play.

1. Felt
2. Roller
3. Roller shaft
4. Set screw
5. Wick
6. Wick
7. Oil tube
8. Wick
9. Oil tube
10. Looper tube clamp B
11. Screw
12. Looper tube clamp A
13. Screw
14. Looper driving plate
15. Shafts [2 pcs]
16. Set screws [2 pcs]
17. Looper lever

18. Looper lever shaft

19. Set screws [2 pcs]

20. Looper driving shaft bracket

21. Looper driving shaft
22. Socket bolt 1076B
23. Screw (Temporarily tighten)

RH-9820 90

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 6. ASSEMBLY

1102B
A Install the wicks as shown in the illustration.

・ Tie in two knots.

Fold twice and pass
・ Cut the ends at a
through the hole.
length 2 mm from the
knots.

(Viewed from directly above)

・ Tie in two knots.

・ Cut the ends at a
length 2 mm from the
knots.

・ Tie once.
・ Pass the knot through (Viewed from underneath)
the tube.

(Viewed from the left) (Viewed from the front)

・ Tie once.
・ Pass the knot through
the tube.

(Clearance)

1103B 1104B

91 RH-9820

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 6. ASSEMBLY

6-12. Spreader mechanism

* Refer to the detailed descriptions on the next page for details on A and B in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

1. Felt
2. Spreader tube clamp
3. Screw
4. Wick
5. Oil tube
6. Fastening bands [2 pcs]
7. Wick

8. Retaining ring C
9. Shaft
10. Retaining ring C
11. Shaft
12. Set screws [2 pcs] B The larger
13. Slide blocks [2 pcs] bevelled
Refer to “7-10. surface should
14. Spreader lever A Adjusting the be on the
spreader timing”. inside.

15. Spreader link shaft

16. Spreader lever B

17. Spreader lever shaft

18. Set screws [2 pcs]
19. Eccentric pin
20. Screw (Temporarily tighten)
21. Plain washers [2 pcs]
22. Screws [2 pcs] (Temporarily tighten)
23. Screw (Fully tighten) 1105B

RH-9820 92

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 6. ASSEMBLY

A Install the wicks as shown in the illustration.

Cut at 0 - 2 mm.

*
1 Tighten so that the
Tie.
1 two fastening bands
*
(6) are not lifted up.

Tie.

1
* Set to 1
mm or less.

*1: Cut the ends at a

length 4 mm from
the knots.
1027B

B Align the top of the spreader link base (b) with the reference line (a) on the spreader link shaft (15), and
then tighten the screw (23).

1028B

93 RH-9820

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 6. ASSEMBLY

6-13. Upper thread trimmer mechanism

* Install in the positions shown in the illustration.

Clearance：

(When at
maximum
extension)

1. Cylinder assembly
2. Socket bolts [2 pcs]
3. Hammer
4. Hammer guide plate
5. Socket bolts [2 pcs]
6. Cylinder setting plate

7. Socket bolts [2 pcs] 0985B

RH-9820 94

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 6. ASSEMBLY

6-14. Threading mechanism

* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Tighten the shoulder screw (11)

followed by the nut (12) so that the
gimp thread take-up driving plate (9)
and the gimp thread tale-up plate (10)
move smoothly with no play.

Make sure the direction is correct.

Make sure the direction is

correct.

95 RH-9820 0944B

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 6. ASSEMBLY

1. 2 pedal thread guide pipe <-00 and -02 specifications only>

2. Screws [2 pcs] 18. Gimp thread guide J
3. Pipe clamp plate 19. Socket bolts [2 pcs]
4. Screws [2 pcs]
<-02 specifications only>
5. Thread guide pipe 20. O Ring [2 pcs]
6. Thread guide pipe support
7. Screw 21. Retaining ring E
22. Solenoid
<-01 specifications only> 23. Screws [2 pcs]
24. Gimp thread shaft
8. Washer 25. Set screws [2 pcs]
9. Gimp thread take-up 26. Tension disc
G-E plate 27. Gimp thread clamp
10. Gimp thread take-up guide 28. Screws [2 pcs]
plate 29. Gimp thread clamp plate
11. Shoulder screw 30. Socket bolts [2 pcs]
12. Nut
13. Springs [2 pcs] 31. Thread guide pipe
14. Gimp thread guide 32. Thread guide pipe support
15. Screw 33. Screw
16. Gimp thread take-up
G-holder

17. Socket bolts [2 pcs]

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 6. ASSEMBLY

6-15. Feed base mechanism

* Refer to the detailed descriptions on pages 102 and 103 for details on A to K in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .
6-15-1. Feed base
＊2

H I

E ＊1

G J
C ＊1
G

＊3

＊2
H

F
＊3

K B
0986B

97 RH-9820

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 6. ASSEMBLY

1. Retaining ring C [4 pcs] 50. Clamp cylinder support 99. Nut (Temporarily tighten)
2. Ball bearings [4 pcs] 51. Set screw 100. Bolt
3. Retaining ring C [4 pcs] 52. Retaining ring E 101. Opening cylinder stopper
4. Retaining ring C 53. Cylinder rod pin
5. Ball bearing 54. Retaining ring E 102. Spring washer
6. Retaining ring C 55. Spring 103. Screws [2 pcs]
7. Y bearing 56. Cylinder screw
8. Y guide shaft 104. Nut (Temporarily tighten)
9. Set screws [2 pcs] 57. Joint [2 pcs] 105. Bolt
10. Clamp lever shaft 58. Opening cylinder rod 106. Opening cylinder stopper
11. Clamp driving lever 59. Opening driving lever L
12. Screw (Temporarily tighten) assembly 107. Spring washer
13. Crank lever B 60. Retaining ring E 108. Screws [2 pcs]
14. Socket bolt 61. Cylinder rod pin B 109. Plate guide B
15. Clamp lever shaft 62. Retaining ring E 110. Flat screws [3 pcs]
16. Clamp driving lever 63. Fulcrum lever plate 111. Plate guides A [5 pcs]
17. Screw (Temporarily tighten) 64. Slide block 112. Flat screws [10 pcs]

<-01 and -02 specifications only>

18. Crank lever B 65. Rocker lever
19. Socket bolt 66. Washer
67. Retaining ring E 113. Thread trimmer cylinder
20. Cylinder rod 68. Cylinder support plate
21. Auxiliary clamp 114. Nut
connecting rod 69. Retaining ring E 115. Nut
<-02 specifications only>

22. Retaining ring E 70. Shoulder screw [3 pcs] 116. Thread trimmer cylinder claw
23. Cylinder rod pin 71. Cylinder screw 117. Joint
24. Retaining ring E 118. Sensor
25. Joint [2 pcs] 72. Joints [2 pcs] 119. Cylinder
26. Auxiliary clamp S holder 73. Opening cylinder rod
27. Retaining ring E 74. Opening driving lever R 120. Socket bolts [2 pcs]
28. Pin assembly
29. Retaining ring E 75. Retaining ring E
<-01 specifications only>

30. Cylinder 76. Cylinder rod pin B 121. Collar

77. Retaining ring E 122. Retaining ring C
31. Screw 78. Fulcrum lever plate 123. Gimp thread take-up guide
32. Washer 79. Slide block shaft
33. Retaining ring C 80. Rocker lever
81. Washer 124. Set screw
34. Spring hook 82. Retaining ring E 125. Feed base plate spring
35. Clamp cylinder rod 83. Cylinder 126. Screws [2 pcs]
36. Air bolster
37. Joint 84. Retaining ring E Route the air tubes and harnesses
38. Cylinder 85. Shoulder screw [3 pcs] here. (Refer to pages 99 - 101.)
86. Speed nut
39. Clamp cylinder support 87. Screw (Temporarily tighten) 127. Feed base cover L
40. Set screw 88. Stopper plate 128. Flat screws [6 pcs]
41. Retaining ring E 89. Opening stopper plate 129. Plate presser
42. Cylinder rod pin 90. Washer 130. Bending washer
43. Retaining ring E 91. Screw (Temporarily tighten) 131. Shoulder screw
44. Spring 92. Speed nut 132. Feed base cover R
93. Screw (Temporarily tighten) 133. Flat screws [6 pcs]
45. Spring hook 94. Stopper plate 134. Plate presser
46. Clamp cylinder rod 95. Opening stopper plate 135. Bending washer
47. Air bolster 96. Washer 136. Shoulder screw
48. Joint 97. Screw (Temporarily tighten) 137. Feed base cover U
49. Cylinder 98. Spring 138. Truss screws [2 pcs]

＊1：Refer to “7-18. Adjusting the work clamp lift amounts”.

＊2：Refer to “7-21. Adjusting the cloth opening amounts”.
＊3：Refer to “7-20. Adjusting the positions of the work clamp plates”.
RH-9820 98

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 6. ASSEMBLY

Routing the air tubes and harnesses <-00 specifications>

The air tubes and harnesses are numbered as shown in the illustration. Check the number of each air tube and
harness to make sure that they are routed correctly as shown in the illustration.

0987B

99 RH-9820

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 6. ASSEMBLY

Routing the air tubes and harnesses <-01 specifications>

The air tubes and harnesses are numbered as shown in the illustration. Check the number of each air tube and
harness to make sure that they are routed correctly as shown in the illustration.

0988B

RH-9820 100

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 6. ASSEMBLY

Routing the air tubes and harnesses <-02 specifications>

The air tubes and harnesses are numbered as shown in the illustration. Check the number of each air tube and
harness to make sure that they are routed correctly as shown in the illustration.

0989B

101 RH-9820

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 6. ASSEMBLY

A Turn the feed base (a) upside down. Place the B Place the retaining rings C (4) onto one side of
four retaining rings C (1) onto one side of the the ball bearing (5), then apply adhesive
four ball bearings (2), then apply adhesive (Threebond 1373B) to the ball bearing (5) and
(Threebond 1373B) to the four ball bearings then insert it into the Y bearing (7).
(2) and then insert them into the four holes (b). * Wipe away any excess adhesive at this
* Wipe away any excess adhesive at this time.
time.

* Install so that the layout of the balls (c) is in * Install so that the layout of the balls (d) is in
an “X” pattern on the installation surface as an “X” pattern on the installation surface as
shown in the illustration. shown in the illustration.

Installation
surface
Installation
surface
0990B 0992B
0991B 0993B

C Assemble as shown in the illustration. D Assemble as shown in the illustration.

(最縮時)

(When at maximum retraction)

0994B 0995B

E Assemble as shown in the illustration. F Assemble as shown in the illustration.

(When at maximum retraction) (When at maximum retraction)

0996B 0997B

RH-9820 102

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 6. ASSEMBLY

G
Set the clamp lever shaft (10) so that the amount
of protrusion at the end is as shown in the
illustration, then assemble crank lever B (13) so
that there is no clearance between it and the inside
of the clamp lever shaft (10), and then tighten the
socket bolt (14).
(The left side is the same.)
(Right side ) 0998B

H Assemble while referring to the finished assembly diagram shown below.

(Left side ) (Right side ) 0999B

1000B
I <For -02 specifications only>
Install to the feed base (a) as shown in the illustration below.

(Viewed from underside)

J <For -02 specifications only> K <For -01 and -02 specifications only>
Install so that the centers of the pin holes (e) Install at the distance shown in the illustration.
and (f) are at the distance shown in the
illustration.

(When at maximum retraction)

(When at maximum retraction)

1001B 1002B

103 RH-9820

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 6. ASSEMBLY

6-15-2. X feed shaft holder

* Refer to the detailed descriptions on pages 105 and 106 for details on A to D in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .
* Apply the grease specified by Brother (Shin Lube EJ manufactured by Nippon Steel Chemical
Corporation) in the places indicated by .

A B
1003B
D

1. Ball bearings [4 pcs] 13. X feed shaft holder S

2. Ball bearing stoppers 14. Washers [2 pcs]
[4 pcs] 15. Socket bolts [2 pcs]
3. Screws [4 pcs]
4. X feed guide shaft B Install the feed base to the bed here.
5. X feed guide shaft A
6. Gears [2 pcs] 16. Y feed guide shafts [2 pcs]
7. Socket bolts [4 pcs] 17. Set screws [4 pcs]
8. Set screw 18. Set screws (8, 12) [2 pcs] (Fully tighten)
(Temporarily tighten) 19. Set screws (11, 15) [4 pcs] (Fully tighten)
9. X feed shaft holder N
10. Washers [2 pcs] <-01 specifications only>
11. Socket bolts [2 pcs] 20. Cylinder screw
(Temporarily tighten)
12. Set screw
(Temporarily tighten)

RH-9820 104

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 6. ASSEMBLY

A
1) Apply adhesive (Threebond 1373B) to the four
ball bearings (1).

2) Insert the four ball bearings (1) into the holes in

the bed so that the layout of the balls (a) is in
an "X" pattern on the base of the bed as shown
in the illustration.

3) While pushing the four ball bearing stoppers (2)

onto the base of the bed, tighten the four
screws (3).
* At this time, insert the projections (b) of the
four ball bearing stoppers (2) into the
grooves (c) and check that the ball bearing
stoppers (2) are flush with the bed surface.
Base of
bed

(Viewed from directly to

the left)

1108B
1004B

B
Install the two gears (6) to X feed shaft holder N
(9) so that the gear (6) with the shorter distance
between the thread hole and the edge is on the
right.
* While pushing the two gears (6) in the
direction of the arrow at this time,
tighten the four socket bolts (7).

(Viewed from the side)

1005B

105 RH-9820

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 6. ASSEMBLY

C
1) Place the feed base unit onto the bed.
2) Insert the Y feed guide shaft (16) on the left
side into the hole (d) in the bed so that the end
with the screw stop goes in first, and pass it
through the two ball bearings (1).

3) Align the screw stop on the Y feed guide shaft

(16) with the screw hole in X feed shaft holder
N (9).
4) Align the end of the Y feed guide shaft (16) with
the end of X feed shaft holder N (9), and then
tighten the two set screws (17).
Align the edges.

5) Install the Y feed guide shaft (16) on the right

side also by following steps 2 to 4 above.

1006B

D <For -01 specifications only>

Install the Cylinder screw (20) in the position shown in the illustration.

1007B

RH-9820 106

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 6. ASSEMBLY

6-16. X feed mechanism

* Refer to the detailed descriptions on the next page for details on A to C in the illustration.
* Apply the grease specified by Brother (Shin Lube EJ manufactured by Nippon Steel Chemical
Corporation) in the places indicated by .

Apply adhesive to the

outer circumferences of
Apply adhesive to the
the two bearings (2) and
outer circumferences of
then install.
the two bearings (2) and
then install.
Install so that the motor B
connectors are facing as
indicated by the arrow.

0963B
C

1. Internal retaining rings [2 pcs]

Install the X idler gear
2. Bearings [2 pcs]
shaft (3) so that there is A 3. X idler gear shaft
no play in the axial
direction and so that it 4. Idler gear
turns smoothly. 5. Set screws [2 pcs]
6. Idler gear
7. Set screws [2 pcs]
(Temporarily tighten)
8. Feed gear
9. Set screws [2 pcs]
10. Pulse motor X assembly
11. Plain washers [4 pcs]
12. Socket bolts [4 pcs]
13. X motor support

14. Socket bolts [3 pcs]

107 RH-9820

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 6. ASSEMBLY

A Assemble as shown in the B Place the pulse motor X assembly (10) against the idler
illustration. gear (4) so that the amount of play is 0.02 mm or less
within a range of 130° as shown in the illustration, and
then tighten the two set screws (9).

0964B 0965B

C Standard installation of motor unit (idler gear adjustment)

1) Place the feed base (c) onto the bed (b) so that
Y feed guide shaft (a) is positioned in the center
of the hole in the front of the bed (b).

2) Loosen the two set screws (7) of the idler gear

(6) in order to engage the X rack (e) and the
idler gear (6) while the X rack (d) and the idler
gear (4) are engaged in the standard position.
3) Set so that the screw stop (A) of the pulse
motor X assembly (10) and the two set screws
(9) of the feed gear (8) are in the positions
shown in the illustration.
4) While pushing the idler gear (4) and idler gear
(6) to engage them with the X racks (d) and (e)
at opposite sides, install the motor unit (f).
5) Tighten the two set screws (7) so that there is
no thrust play in the idler gear (6).

* If only removing the motor unit (f), steps 2 and

5 in the adjustment procedure for the idler gear
(6) can be omitted. (If carrying out any
disassembly or assembly which changes the
positions of the X racks or if re-adjusting the
backlash, carry out the full procedure.)

0966B
0967B
0968B

RH-9820 108

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 6. ASSEMBLY

6-17. Lower thread tension mechanism

* Refer to the detailed descriptions on the next page for details on A in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Refer to “7-32.
Adjusting the lower
thread loosening
amount”.

Refer to “7-23. Adjusting the lower thread feeding

amount <-01 specifications only>”.

0969B
109 RH-9820

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 6. ASSEMBLY

[-00 and -02 specifications only] [-01 specifications only]

1. Spring pin 1. Spring pin

2. Stopper 2. Stopper
3. Lower thread release plate 3. Lower thread take-up guide
4. Spring lever
5. Retaining ring C 4. Spring
6. Lower thread guide B 5. Retaining ring C
7. Screws [2 pcs] 6. Lower thread guide B
8. Lower thread guide A 7. Screws [2 pcs]
9. Screws [2 pcs] 8. Lower thread guide A
9. Screws [2 pcs]
10. Tension discs [2 pcs]
11. Tension disc presser 10. Tension discs [2 pcs]
12. Spring 11. Tension disc presser
13. Washer 12. Spring
14. Tension nut 13. Washer
15. Tension stud 14. Tension nut
15. Tension stud
16. Tension release pin
17. Nut (Temporarily tighten) 16. Tension release pin
18. Solenoid cushion 17. Nut (Temporarily tighten)
19. Washer 18. Solenoid cushion
20. Solenoid shaft 19. Washer
21. Solenoid 20. Solenoid shaft
22. Plain washers [2 pcs] 21. Solenoid
23. Spring washers [2 pcs] 22. Plain washers [2 pcs]
24. Bolts [2 pcs] 23. Spring washers [2 pcs]
25. Solenoid setting plate 24. Bolts [2 pcs]
26. Plain washers [2 pcs] 25. Solenoid setting plate
27. Socket bolts [2 pcs] 26. Plain washers [2 pcs]
28. (Not used for -00 and -02 27. Socket bolts [2 pcs]
specifications) 28. Lower thread guide C
29. (Not used for -00 and -02 29. Screws [2 pcs]
specifications) 30. Lower thread guide adjusting
30. Lower thread guide adjusting plate plate

31. Socket bolts [3 pcs] 31. Socket bolts [3 pcs]

A
[For -00 and -02 specifications] [-01 specifications]
Insert the longer end of the spring (4) into the Insert the longer end of the spring (4) into the spring
spring pin (1), and insert the shorter end into the pin (1), and insert the shorter end into the notch in the
notch in the lower thread release plate (3). lower thread take-up guide lever (3).

0970B

RH-9820 110

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 6. ASSEMBLY

6-18. Upper shaft motor mechanism

* Refer to the detailed descriptions on pages 112 to 114 for details on A to C in the illustration.

NOTE:
・ Check that the Y feed motor assembly and the pulse motor R assembly are installed before carrying out
this procedure.
If they are not installed, install them first.
・ After carrying out the procedure in “C Standard installation of upper shaft motor unit and belt tension
adjustment”, be sure to carry out the adjustments in “7-35. Adjusting the needle up signal home position for
the upper shaft and upper shaft motor” and “7-36. Adjusting the upper shaft stop position”.

B A

0852B

1. Motor assembly
2. Socket bolts [5 pcs]
3. Timing pulley
4. Set screws [2 pcs]
5. Motor holder

6. Socket bolts with washers [3 pcs]

7. Motor cover
8. Belt guide
9. Screws [2 pcs]

111 RH-9820

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 6. ASSEMBLY

A Install so that the cord (a) is in the position B Align the screw at the front of the timing pulley
shown in the illustration. (3) in the direction of rotation with the screw
stop on the motor shaft (b), and then tighten
the screw so that the shaft projects by 0.5 - 1.0
mm.

Screw stop
side

0853B 0854B

C Standard installation of upper shaft motor unit and belt tension adjustment

<If the belt (upper shaft - lower shaft) is not installed>

1) With the machine head tilted back, hold the
upper shaft motor unit (c) at the front, and place
the positioning pin (e) at the rear of the
machine head into the slot (A) in the motor
holder (d).
2) Provisionally screw in the socket bolt with
washer (f) until it is almost fully tightened.
3) Return the machine head to its original position.

4) Provisionally screw in the two remaining socket

bolts with washers (g) at the back of the
machine head until they are almost fully
tightened, and then place the motor on the
lower shaft side.
5) Place the belt (h) onto the lower shaft timing
pulley (i) and the motor pulley (j).
6) Insert a screwdriver into the gap between the
motor holder (d) and the bed (k) and move the
upper shaft motor unit (c) to the left to adjust
the tension of the belt (h) to within the range
given below.
• When using a new belt: 130 - 140 N
• When reusing an old belt: 90 - 100 N
7) Tighten the two socket bolts with washers (g).
8) Tilt back the machine head and fully tighten the
Measurement position
socket bolt with washer (f) at the front.

* Be sure to use a belt tension gauge to measure

the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 15 mm and a span length of 92 mm.
0855B

RH-9820 112

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 6. ASSEMBLY

<If the belt (upper shaft - lower shaft) is installed>

1) Remove the face plate (l) and the rubber cap

(m), and then insert the accessory pin (n) into
the groove (C) in the upper shaft crank from the
hole (B) in the arm to stop the upper shaft from
turning. (Upper shaft 0° position)

2) Remove the motor cover (7) if it is installed to

the upper shaft motor unit (c).
3) With the machine head tilted back, hold the
upper shaft motor unit (c) at the front, and then
place the belt (h) onto the motor pulley (j) so
that the D cut section (D) of the encoder is
facing directly to the right.
4) Place the positioning pin (e) at the rear of the
machine head into the slot (A) in the motor
holder (d).

5) Provisionally screw in the socket bolt with

washer (f) until it is almost fully tightened.
6) Return the machine head to its original position.

(Continued on next page)

0975B

113 RH-9820

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 6. ASSEMBLY

7) Provisionally screw in the two remaining socket

bolts with washers (g) at the back of the
machine head until they are almost fully
tightened, and then place the motor on the
lower shaft side.
8) Insert a screwdriver into the gap between the
motor holder (d) and the bed (k) and move the
upper shaft motor unit (c) to the left to adjust
the tension of the belt (h) to within the range
given below.
• When using a new belt: 130 - 140 N
• When reusing an old belt: 90 - 100 N
Measurement position
* Be sure to use a belt tension gauge to measure
the belt tension, and measure at the position
shown in the illustration.
* The belt tension gauge should be set to
measure a unit weight of 0.04 kg/m, a belt width
of 15 mm and a span length of 92 mm.

9) Tighten the two socket bolts with washer (g).

10) Tilt back the machine head and fully tighten the
socket bolt with washer (f) at the front.
11) Check that the D cut section (D) of the encoder
is facing directly to the right ± 10° at this
time.
* If it is not in this position, repeat steps 3 to
10. (If it is not in the correct position, the
adjustment in “7-35. Adjusting the needle up
signal home position for the upper shaft and
upper shaft motor” will not be possible.)

NOTE:
If you do not have a belt tension gauge, adjust
so that the amount of deflection is
approximately 1 mm when a pressure of 5 N is
applied to the middle of the span (the
measurement position shown in the illustration).
0856B

RH-9820 114

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 6. ASSEMBLY

6-19. Covers

1064B

115 RH-9820

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 6. ASSEMBLY

1. Cam cover
2. Screws [3 pcs]
3. Needle guide cover
4. Screws [4 pcs]
5. Main plate
6. Screws [4 pcs]
7. Eye guard assembly
8. Plain washers [2 pcs]
9. Screws [2 pcs]
10. Zigzag window cover
11. Wave washer
12. Shoulder screw
13. Rear cover
14. Screws [5 pcs]
15. Belt cover
16. Screws with washers [4 pcs]
17. Top cover assembly
18. Screws [9 pcs]
19. Needle bar guard
20. Socket bolts [2 pcs]
21. Switch cover
22. Screws with washers [3 pcs]

RH-9820 116

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 6. ASSEMBLY

6-20. Work clamp plate mechanism

* Refer to the detailed descriptions on pages 119 and 120 for details on A to D in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

B A D C

B A C
D

C
A D
B

Refer to “7-26-4. Adjusting the position of the

1008B sub clamp”.

117 RH-9820

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 6. ASSEMBLY

1. Opening slide block 26. Opening slide block

2. Slide block support plate 27. Slide block support plate
3. Screws [2 pcs] 28. Screws [2 pcs]
4. Needle plate L 29. Needle plate R
5. Flat screws [2 pcs] 30. Flat screws [2 pcs]
6. Clamp shaft holder 31. Clamp shaft holder
7. Screws [2 pcs] 32. Screws [2 pcs]
8. Cloth guide L 33. Cloth guide R
9. Screw 34. Screw

10. Bending washer 35. Bending washer

11. Work clamp L 36. Cloth work clamp R
12. Clamp support pin 37. Clamp support pin
13. Work clamp plate L 38. Work clamp plate R
<-01 specifications only> <-01 specifications only>
14. Nut 39. Nut
15. Clamp arm L 40. Clamp arm R

16. Socket bolt (Temporarily tighten) 41. Socket bolt (Temporarily tighten)
17. Clamp lever L 42. Clamp lever R

18. Clamp fulcrum shaft 43. Clamp fulcrum shaft

19. Retaining rings C [2 pcs] 44. Retaining rings C [2 pcs]
20. Set screws [2 pcs] 45. Set screws [2 pcs]
<-02 specifications only>
<-00 specifications only>

21. Plate spring 46. Cloth work clamp A

22. Screw 47. Sub auxiliary clamp wrist
23. Thread trimmer B 48. Socket bolt (Temporarily tighten)
24. Thread trimmer A 49. Auxiliary clamp arm
25. Screw
50. Retaining rings C
51. Spring

RH-9820 118

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 6. ASSEMBLY

A Cloth work clamp L sideways position adjustment

1) Set so that the clearance between the clamp shaft holder (6) and clamp lever L (17) is at the distance
shown in the illustration.
2) After adjusting, tighten the two set screws (20).

1009B

B Cloth work clamp L forward/back adjustment

1) Loosen the socket bolt (16) and then adjust the forward/back position of clamp arm L (15).
2) Next, adjust cloth work clamp L (11) so that its side is flush with the side of needle plate L (4).
3) Once adjustment is complete, tighten the socket bolt (16).

(Viewed from directly to the left)

1010B

119 RH-9820

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 6. ASSEMBLY

C Cloth work clamp R sideways adjustment

1) Set so that the clearance between the clamp shaft holder (31) and clamp lever R (42) is at the distance
shown in the illustration.
2) After adjusting, tighten the two set screws (45).

1011B

D Cloth work clamp R forward/back adjustment

1) Loosen the socket bolt (41) and then adjust the forward/back position of clamp arm R (40).
2) Next, adjust the cloth work clamp R (36) so that its side is flush with the side of needle plate R (29).
3) Once adjustment is complete, tighten the socket bolt (41).

(Viewed from directly to the right)

1012B

RH-9820 120

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 6. ASSEMBLY

6-21. Lower thread trimming mechanism

<-01 specifications>
* Refer to the detailed descriptions on pages 123 and 124 for details on A to E in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .
Refer to “7-25. Replacing and
adjusting the movable knife and fixed
knife (for the lower thread and gimp)
<-01 specifications>”.

Refer to “7-25.
Replacing and
adjusting the
movable knife and
fixed knife (for the
lower thread and
gimp) <-01
specifications>”.

1013B
C
A
121 RH-9820

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 6. ASSEMBLY

1. Bush thread trimmer arm 25. Flat screws [3 pcs]

2. Screws [2 pcs] 26. Movable knife collar
3. Nut 27. Thread nipper opener
4. Spring hook 28. Shoulder screw
5. Screws [2 pcs] 29. Opener spring
30. Screws [2 pcs]
6. Roller
7. Retaining ring 31. Fixed knife
8. Thread trimmer link lever 32. Fixed knife plate spring
assembly 33. Fixed knife plate spring U
34. Thread guide plate
9. Shoulder screw 35. Socket bolts [2 pcs]
10. Nut 36. Fixed knife setting bracket
11. Fixed knife bracket
12. Flat screws [2 pcs] 37. Screws [2 pcs]
13. Thread trimmer arm (Temporarily tighten)

14. Pin 38. Opener pin

15. Spring hook 39. Thread nipper D
16. Screw 40. Thread nipper U
17. Thread cutter lever arm 41. Screws [2 pcs]
42. Nuts [2 pcs]
18. Socket bolt 43. Thread nipper M
(Temporarily tighten)
19. Spring 44. Screws [2 pcs]
(Temporarily tighten)
20. Pin 45. Work clamp plate U
21. Thread handler 46. Screws [2 pcs]
22. Flat screw
(Temporarily tighten)
23. Screw
(Temporarily tighten)
24. Movable knife

RH-9820 122

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 6. ASSEMBLY

A Spring hook installation

1) Provisionally tighten the nut (3) about halfway
onto the spring hook (4).
2) Install the spring hook (4) to the cloth work
clamp plate (a), and then tighten the nut (3)
until the end of the spring hook (4) is flush with
the top surface of the cloth work clamp plate
(a).
* Install the spring hook (4) so that the hole
(Top)
(b) is facing in the direction shown in the
illustration.
Should be flush

(Bottom)

1014B

B Install the pin (14) so that it projects by the C Install the spring hook (15) so that it faces in
distance shown in the illustration. the direction shown in the illustration.

1015B 1016B

123 RH-9820

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 6. ASSEMBLY

D Insert the end of the opener spring (29) into E Install all parts so that the edges are aligned as
the notch (c) of the thread nipper opener (27). shown in the illustration.

Align the edges.

1017B 1018B

RH-9820 124

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 6. ASSEMBLY

<-02 specifications>
* Refer to the detailed descriptions on the next page for details on F and G in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

Refer to “7-26. Replacing

and adjusting the movable
knife and fixed knife (for the
lower thread and gimp) <-02
specifications>”.

Refer to “7-26.
Replacing and
adjusting the
movable knife
and fixed knife
(for the lower
thread and gimp)
<-02 F
specifications>”. 1019B

125 RH-9820

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 6. ASSEMBLY

1. Knife support washer 15. Shoulder screw

2. Flat screws [2 pcs] (Temporarily tighten)
3. Bush thread trimmer arm 16. Nut (Temporarily tighten)
4. Screws [2 pcs] 17. Movable knife driving plate
5. Nut
6. Spring hook 18. Roller
7. Screws [2 pcs] 19. Retaining ring
8. Thread trimmer link A 20. Thread trimmer link lever J
assembly assembly
9. Thread trimmer link B
assembly 21. Shoulder screw
10. Wave washer 22. Nut
11. Movable knife R
23. Pin
12. Thread handler 24. Spring hook
13. Screws [2 pcs] 25. Screw
14. Movable knife L 26. Thread cutter lever arm

27. Socket bolt

(Temporarily tighten)
28. Spring
29. Work clamp plate JU
30. Screws [2 pcs]

F Spring hook installation

1) Provisionally tighten the nut (5) about halfway

onto the spring hook (6).
2) Install the spring hook (6) to the cloth work
clamp plate (a), and then tighten the nut (5) to
the position shown in the illustration.
* Check that the end of the spring hook (6) is
not protruding from the surface of the cloth
(Top)
work clamp plate (a).
* Install the spring hook (6) so that the hole
(b) faces in the direction shown in the
illustration.
(Bottom)

1020B

G
Install the pin (23) so that it projects by the
distance shown in the illustration.

1021B

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 6. ASSEMBLY

6-22. Upper cover mechanism (upper thread tension release and upper
thread take-up mechanisms and upper thread path)
* Refer to the detailed descriptions on the next page for details on A to C in the illustration.
* Apply the grease specified by Brother (MOLYKOTE LONGTERM W2 manufactured by Dow Corning
Corporation) in the places indicated by .

C 0857B

Refer to “7-31.
Adjusting the
upper thread After installing the
loosening B Socket bolt (16),
amount”.
tighten the two screws
(4) so that the cylinder
moves smoothly.

127 RH-9820

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 6. ASSEMBLY

1. Cylinder assembly 23. Screws [2 pcs] 42. Screws [2 pcs]

2. Cylinder joint A 43. Upper thread guide A
3. Cylinder setting plate A 24. Tension discs [2 pcs] 44. Screw
25. Tension disc presser
4. Screws [2 pcs] 26. Tension disc presser 45. Thread guide discs [2 pcs]
(Temporarily tighten) 27. Tension spring 46. Pre-tension spring B
28. Washer 47. Tension nut
5. Thread take-up lever 29. Tension nut 48. Tension stud
driving plate 30. Tension stud U
6. Thread take-up lever plate 49. Thread guide rod A
7. Collar A 31. Set screw 50. Sewing thread retainer guide
8. Washer 32. Tension release pin 51. Screws [2 pcs]
9. Socket bolt 52. Sewing thread retainer guide
10. Nut 33. Solenoid cushion 53. Screws [2 pcs]
11. Screw 34. Washer 54. Thread spool pin
12. Thread take-up lever base 35. Nut 55. Nut
36. Bolt 56. Rubber cap
13. Screws [2 pcs] 37. Upper thread tension release
14. Collar B solenoid
15. Washer 38. Plain washers [2 pcs]
16. Socket bolt 39. Spring washers [2 pcs]
40. Bolts [2 pcs]
17. Plain washer 41. Solenoid setting plate
18. Compression spring
19. Impact support shaft
20. Retaining ring C
21. Button clamp A
22. Impact support plate

A Assemble as shown in the illustration.

(When cylinder is at maximum retraction) 0858B

B Assemble as shown in the illustration. C Install the thread spool pin (54) so
that the holes face in the direction
shown in the illustration.

Holes

(When cylinder is at
0859B 0860B
maximum retraction)

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 6. ASSEMBLY

6-23. Routing the harnesses

Route the harnesses from the various parts in the order shown in the table below.
Upper tension release
Stop switch solenoid

<1> Cord holder

Cutter sensor <2> Cord bush
<3> Cord holder
Main valve harness
<4> Cord holder
<5> Cord holder
Relay harness <6> Fastening band
<7> Cord holder
<8> Cord holder
<9> Cord holder
<10> Cord holder
<11> Cord holder
<12> Cord holder
<13> Cord holder
Upper thread <14> Cord holder
solenoid harness
1106B [A]-[G]：Indicates holes
[H]：Indicates a gap

Routing order
1 2 3 4 5 6 7 8 9
Part name
Stop switch <1> <2> <3> <4> <5> [A] <8>
Cutter sensor <6> <7> [A] <8>
Upper tension release solenoid [A] <8>
Main valve harness <8> <9> [B] [E] <12> [F] <13> <14> [G]
Relay harness <9> [B] [E] <12> [F] <13> <14> [G]
Upper thread solenoid harness <9> [B] [E] <12> [F] <13> <14> [G]

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 6. ASSEMBLY

Y sensor

Gimp thread solenoid

Lower tension release Safety switch

solenoid

X motor
θ motor

Fan

Upper shaft motor

Y motor

1107B

Routing order
1 2 3 4 5 6 7 8 9
Part name
Gimp thread solenoid [C] [E] <12> [F] <13> <14> [G]
Y sensor <10> [D] <11> <13> <14> [G]
Lower tension release solenoid [E] <12> [F] <13> <14> [G]
Safety switch <11> <13> <14> [G]
X motor <13> <14> [G]
Y motor [G]
θmotor [G]
Upper shaft motor [H]
Fan [G]

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 6. ASSEMBLY

6-24. Routing the air tubes

Cutter cylinder
Insert the air tubes (No. 5 and No. 6) of the cutter cylinder (a) into the elbows (b) in the bed base.
* Insert the air tubes into the elbows (b) with the same numbers.

1065B

Upper thread cutter cylinder

1) Pass the air tubes (No. 13 and No. 14) of the upper thread cutter cylinder (c) through the hole in the bed
and out through the bottom.
2) Secure the air tubes with the cord holder (d).

3) Pass the air tubes (No. 13 and No. 14) through the hole in the bed as shown in the illustration below.

4) Pass the air tubes (No. 13 and No. 14) out through the bottom of the bed into the side of the arm, and
then pass them out through the side of the arm.

(Left side of arm) 1066B

1067B
1068B

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 6. ASSEMBLY

Valve unit
1) Pass the air tube (No. 1) of the valve unit (e) from the side marked with “1” into the hole in the side of the
arm and out into the bottom of the bed.

2) Pass the air tube (No. 1) through the hole in the bed and out from the rear of the bed.

1069B
1070B

Cutting scraps
1) Secure the air tube (f) for cutting scraps with the cord holder (g).
2) Pass the air tube (f) for cutting scraps through the hole and out from the rear of the bed.

3) Secure the air tube (No. 1) for the valve unit (e) and the air tube (f) for cutting scraps with the tube
presser (h).

1071B
1072B

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 6. ASSEMBLY

Upper tension release cylinder

Pass the air tube (i) for the upper tension release cylinder through the hole in the arm and out from the side
of the rear cover.

(Left side of arm)

1073B

Connecting the air tubes 《Solenoid valve tubes and functions》

Insert the air tubes onto the nipples of the solenoid valve
assembly (j). Label
* There are numbers marked on each air tube. Insert the air No. Solenoid valve type
tubes onto nipples with corresponding numbers. 1 For upper thread take-up
2 For upper thread trimming
Insert the plug (4).
3 For cloth spreading (+ for
1
auxiliary clamp arm * )
4 For cloth work clamp
5 For lower thread trimming *2
1
* : Auxiliary clamp arm is for -02 specifications
only.
2
* : The solenoid valve for label No. 5 is not
present in specifications without a lower
thread trimmer.

1074B

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 6. ASSEMBLY

Securing the air tubes

Secure the air tubes and the harnesses with the cord holders (k) (2 places).

Tubes and harnesses from the feed base

1075B

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 6. ASSEMBLY

6-25. Lubrication and greasing and routing the oil tubes

* <1> to <8> should be done before carrying out the assembly procedure in “6-1. Cutter mechanism”.
* Refer to the detailed descriptions on pages 136 to 140 for details on A to J in the illustration.

E C

I
G 1029B

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 6. ASSEMBLY

<1> Oil tube 14. Cord holder (NK-3N) 38. Cord holder (NK-3N)
<2> Felt assembly 15. Screw 39. Screw
(Attach with glue) 16. Tube support 40. Sub-tank assembly
<3> Tube guide 17. Socket bolts [2 pcs] 41. Socket bolts [2 pcs]
<4> Socket bolt 18. Cord holder (NK-3N) 42. Tube clip spring
<5> Wick 19. Screw 43. Oil tube (<6>)
<6> Oil tube 20. Cord holder (Push into sub-tank)
<7> Cord holder #5 21. Screws [2 pcs] 44. Cord holders (7N) [4 pcs]
<8> Screw 22. Cord holder 45. Screws [4 pcs]
23. Screw 46. Wick
1. Wick 24. Cord holder (NK-3N) 47. Wick
2. Oil tube 25. Screw 48. Felts [2 pcs]
3. Oil joint S 26. Oil plate assembly 49. Felt
4. Collar 27. Screws [4 pcs] 50. Tube support B
5. Oil joint S 28. Cord holder #5 51. Screw
6. Collar 29. Screw 52. Felt
7. Oil tube 30. Oil gauge window 53. Cord holder #5
31. Felt 54. Screw
8. Cord holder (NK-3N) 32. Lower shaft cover assembly
9. Screw 33. Screws [2 pcs]
34. Cord holders #5
10. Wick 35. Screw
11. Oil joint S 36. Cord holders #10 [2 pcs]
12. Collar 37. Screws [2 pcs]
13. Oil tube

A Install the oil tube (7) and the oil tube (13) to the tube support (16) as shown in the illustration.

Align the
edges

1030B

B Secure the oil tube (13) with the cord holder (NK-3N) (18) as shown in the illustration.

1031B

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 6. ASSEMBLY

C Cord holder (20) installation

1) Install the cord holder (20) so that the side with
the wider hook is on the right as shown in the
illustration, and then while gently pushing it in
the direction of the arrow, tighten the two
screws (21) to secure it in place.
Wide
Narrow side
side

2) Secure the oil tube (7) behind the cord presser

(20) and the stop switch cord (a) with the cord
presser (22).

1032B

D Tapping in the oil pot window

1) Insert the oil tube (6) and the oil tube (b)
coming from the oil plate assembly (26) into the
oil tank.

2) Check that the wick (c) is attached to the base

of the oil tank, and then tap in the oil gauge
window (30).

1033B

E Inserting the wicks

1) Insert the four wicks (d) into the arm relay hole
(e).
* Insert the four wicks (d) securely into the
holes as far as they will go.
* A list of the four wicks (d) is as follows.
・Wick (1)
・Wick (10)
・Felt presser assembly (7) in “6-6. Needle
bar mechanism (2)”
・Wick (11) in “6-3. Zigzag mechanism”

2) Push in the felt (31).

1034B

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 6. ASSEMBLY

F Installing the lower shaft cover assembly

1) Pass the oil tube (43) through the hole (f) in the
lower shaft cover assembly (32).

2) Pass the oil tube <1> from the arm through the
felts.

1035B

G
1) Secure the oil tube (43) with the cord holder #5
(34).
2) Install the two cord holders #10 (36) as guides
for routing the oil tube (43).

3) Connect the oil tube (43) to the sub-tank

assembly (40).
* Make sure that the wick <5> does not cover
the hole.
Maintain a
clearance

1036B

H Secure the oil tube (g) coming from the sub tank assembly (40) with the four cord holders (44).

1037B

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 6. ASSEMBLY

I
1) Insert the wicks (46) and (47) into the hole in
the bed as far as they will go.

2) Push the two felts (48) into the positions shown

in the illustration.

3) Insert the four wicks mentioned below into the

bed hole (h).
・ Thin wick (i) coming from sub tank assembly
(40)
・ Wick (6) and wick (8) (j) of “6-11. Looper
mechanism”
・ Wick (4) (k) of “6-12. Spreader mechanism”

4) Push the felt (49) into the bed hole (h).

5) Secure the oil tubes with the tube support B

(50).

1038B
1039B
1040B

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 6. ASSEMBLY

J
1) Pass the thicker oil tube (l) through the
underside of the bed.

2) Pass the oil tube (l) through the hole (m), (n) in
the bed and out from the looper base side.

3) Push the felt (52) in through the hole (o) in the

bed so that it is touching the wick.
4) Secure the oil tube (l) with cord holder #5 (53).

1041B
1042B

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 7. ADJUSTMENTS

7. ADJUSTMENTS
CAUTION
Maintenance and inspection of the sewing machine Disconnect the air hoses from the air supply and wait
should only be carried out by a qualified technician. for the needle on the pressure gauge to drop to “0”
Ask your Brother dealer or a qualified electrician to before carrying out inspection, adjustment and repair
carry out any maintenance and inspection of the of any parts which use the pneumatic equipment.
electrical system. If the power switch and air need to be left on when
Turn off the power switch and disconnect the power carrying out some adjustment, be extremely careful to
cord at the following times. observe all safety precautions.
If this is not done, the sewing machine may operate if If any safety devices have been removed, be
the start switch is pressed by mistake, which could absolutely sure to re-install them to their original
result in serious injury. positions and check that they operate correctly before
• When carrying out inspection, adjustment and using the machine.
maintenance
• When replacing consumable parts such as the
loopers and knife

7-1. Adjusting the heights of the spreaders and loopers

Spreader height

(When viewed from directly above) (When viewed from the front)
0481B

1. Remove the work clamp plates. (Refer to “3-19. Installing and removing the work clamp plates” in the instruction manual.)
2. Check the following.
• Check that the spring (3) causes the spreader L (1) to move smoothly without any play between the spreader stopper L
(4) and the LS holder base (5).
• Check that the spring (3) causes the spreader R (2) to move smoothly without any play between the spreader stopper R
(6) and the LS holder base (5).
3. If the spreaders do not move smoothly or if there is play in their movement, loosen the set screws (7) and move the spreader
stopper L (4) or spreader stopper R (6) up or down to adjust.
4. Once adjustment is complete, securely tighten the set screws (7).

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 7. ADJUSTMENTS

Looper height

0483B

Adjust so that the positions of the eye looper (8) and the looper R (9) are as follows.
• The clearance <a> between the eye looper (8) and the spreader L (1) should be equal to the thickness of the lower thread
(looper thread).
• The clearance between the looper R (9) and the spreader R (2) should be as small as possible (so that the two parts do not
touch).
<Adjustment method>
1. Loosen the set screws (10), and then move the eye looper (8) or the looper R (9) up or down to adjust.
2. Check that the spreader L (1) and the spreader R (2) move smoothly by the force of the springs (3).
3. Once adjustment is complete, securely tighten the set screws (10).

7-2. Adjusting the zigzag width (stitch width)

The zigzag width can be adjusted to between 1.5 - 4 mm. It is set to 3 mm at the time of shipment from the factory.
* If the zigzag width is set to 3.2 mm or more, replace the throat plate (optional part).

1.5mm - 4mm
0967Q 0474B

1. Turn the cover (1) to open it.

2. Use the accessory socket wrench to loosen the zigzag width adjustment nut (2).
3. Move the adjustment screw (3) up or down along the slot to adjust.
* The zigzag width becomes smaller as the adjustment screw (3) is moved upward.
* The zigzag width becomes larger as the adjustment screw (3) is moved downward.
* There are index marks at the 2 mm and 3 mm zigzag width positions. Align the middle of the adjustment screw (3) with the
index marks.
4. Once adjustment is complete, securely tighten the adjustment nut (2), and then close the cover (1).

NOTE:
• If the zigzag width has been increased, carry out the following readjustments.
“7-4. Adjusting the needle and looper timing”, “7-5. Adjusting the looper stroke”, “7-6. Adjusting the height of the needle bar”,
“7-7. Adjusting the clearance between the loopers and needle”, “7-8. Adjusting the needle guard”, “7-9. Adjusting the
spreader installation positions”, “7-10. Adjusting the spreader timing”.
• The index marks are a guide to the zigzag width. Lower the needle onto a piece of paper or similar to accurately measure
the zigzag width.

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 7. ADJUSTMENTS

7-3. Adjusting the zigzag base line position

Preparing a short customized needle
Prepare a short needle as described below in order to make very small holes in a piece of paper while checking the needle drop
position.

1. Use a grinder or similar to grind the tip of the

middle middle currently-used needle until the length of the needle is 15
mm.
2. Sharpen the tip of the needle.

NOTE:
Sharpen the needle so that the tip of the needle is in the
middle.

Sharpen tip
0563B

3. Place a piece of paper (1) underneath the work clamps.

4. Turn the upper shaft pulley (2) to set the needle to its
lowest position.
5. Move the needle up or down to adjust the installation
position of the needle so that the tip of the needle makes a
hole with a width of about 0.5 mm in the paper (1) when
the needle comes to the needle down position.

Hole width approx. 0.5 mm

0564B

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 7. ADJUSTMENTS

Adjusting the zigzag base line position

The zigzag base line is on the inside of the zigzag.
If you change the zigzag width, only the outer needle drop position will change, and the zigzag base line (inner base line) will not
change.

1. Move the needle bar gear block (θ) to the home position.
* The home position for the needle bar gear block (θ) is
when the bed index mark (1) and the looper base index
mark (2) are aligned.

0329B

2. Install the short customized needle (3).

(Refer to “Preparing a short customized needle” on the
previous page.)

0562B

0431B 3. Move the feed base (4) forward (to near the sewing start
position) by hand.
4. Place a piece of paper (5) underneath the work clamps.
* Secure the piece of paper so that it will not move.
5. Turn the upper shaft pulley (6) to lower the needle so that it
makes a small hole in the paper (5).
6. Turn the upper shaft pulley (6) in reverse to return the
needle to its original position (needle up position).
7. Turn the needle bar gear block (needle bar) (7) by hand
180 degrees.
8. Turn the upper shaft pulley (6) to lower the needle so that it
makes a small hole in the paper (5).
* If the inner needle drop positions (A) are not aligned,
carry out the adjustments in steps 9 - 12 on the next
page.

(Continued on next page)

0475B

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 7. ADJUSTMENTS

<Zigzag base line position adjustment>

9. Remove the face plate (8), and then loosen the socket bolt
(9).

0476B

10. Open the cover (10), and then remove the cap (11).
11. Insert a flat-tipped screwdriver into the hole and turn the
zigzag eccentric pin (12) to adjust the zigzag base line
position.
12. Tighten the socket bolt (9).
13. Repeat steps 4 - 12 until the inner zigzag base line is
aligned correctly.
14. Once adjustment is complete, return the cap (11), cover
(10) and face plate (8) to their original positions.

0434B

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 7. ADJUSTMENTS

7-4. Adjusting the needle and looper timing

NOTE:
The needle bar moves through two needle drop cycles for each single turn of the upper shaft pulley. The needle drop
movement toward the left side (knife cutting side) is called the “inside sewing position”, and the needle drop movement
toward the right is called the “outside sewing position”. In addition, the amount of movement involved when the needle bar
rises from its lowest position until the tip of the looper at either the left or right is aligned with the center of the needle is called
the “loop stroke”.
The left and right loop strokes must be the same as each other. This section describes the adjustments to be carried out so that
the left and right loop strokes are the same.
* Before carrying out these adjustments, set the zigzag width (stitch width). (Refer to “7-2. Adjusting the zigzag width (stitch
width)”.)

Lowest position When center of needle is

of needle bar aligned with tip of looper

=
(Inside sewing (Outside sewing
position) position)

0484B

1. Remove the two socket bolts (1), an then remove the needle bar guard (2).
2. Turn the upper shaft pulley (3) to set the needle bar to its lowest position at the inside sewing position.
3. Use calipers to measure the length from the edge of the needle bar (4) to the top of the needle bar bush holder base (5).
4. Next, turn the upper shaft pulley (3) until the tip of the eye looper (6) is aligned with the needle center (7).
5. In the same was as in step 3, use calipers to measure the length from the edge of the needle bar (4) to the top of the needle
bar bush holder base (5).
6. Calculate the difference <a> between the value obtained in step 5 and the value obtained in step 3.
7. Repeat steps 2 - 6 and calculate the difference <a'> for the outside sewing position in the same way as for the inside sewing
position.
* For the inside sewing position, align the tip of the eye looper (6) with the needle center (7), and for the outside sewing
position, align the tip of looper R (8) with the needle center (7).

8. Loosen the screw (9).

9. Move the LS holder base (10) to the left or right to adjust
so that length <a> and length <a'> are the same.
10. Once adjustment is complete, securely tighten the screw
(9).

(Viewed from the front)

0487B 0488B

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 7. ADJUSTMENTS

7-5. Adjusting the looper stroke

The standard looper stroke is 2.7 mm. (It may be preferable to change this depending on the material and thread.)
* Carry out the adjustment in “7-4. Adjusting the needle and looper timing” before making this adjustment.

0489B

1. Turn the upper shaft pulley (1) to set the needle bar to the needle drop position at the inside sewing position.
2. At this position, use calipers to measure the length from the edge of the needle bar (2) to the top of the needle bar bush
holder base (3).
3. Add 2.7 mm to the value obtained in step 2 above, and set the width of the calipers to the resulting value.
4. Turn the upper shaft pulley (1) until the edge of the needle bar (2) touches the edge of the calipers, and stop turning the
upper shaft pulley (1) at that point (A).

Moves to left

Moves to right

Push against Should be no gap

0490B 0327B 0491B

5. Tilt back the machine head.

6. Loosen the two set screws (5) of the lower shaft cam (4).
7. With the upper shaft pulley (1) stopped, turn the lower shaft cam (4) to adjust so that the tip of the eye looper (6) is aligned
with the needle center (7).
8. Once adjustment is complete, push the lower shaft cam (4) against the surface of the bearing collar (8), and then securely
tighten the two set screws (5).

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7-6. Adjusting the height of the needle bar

The standard height for the needle bar is 2.5 mm. (It may be preferable to change this depending on the material and thread.)

0497B

0328B 0450B 0496B

1. Remove the face plate.

2. Turn the upper shaft pulley until the tip of the eye looper (1) is aligned with the top edge of the needle hole in the needle
center (2) when the needle is at the inside sewing position.
3. Loosen the two screws (4) of the top and bottom needle bar clamps (3).
4. Lower the needle bar (5) 2.5 mm from the position where the tip of the eye looper (1) is aligned with the top edge of the
needle hole.
5. In order to make the needle bar turn smoothly, adjust so that there is no play in the needle bar, but so that there is enough of
a gap between the needle bar clamps (3) and the needle bar feed rock link (6) for oil to get into.
6. Once adjustment is complete, securely tighten the two screws (4) and install the face plate.

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 7. ADJUSTMENTS

7-7. Adjusting the clearance between the loopers and needle

If the needle count has been changed, always be sure to check the clearance between the needle and the loopers, and adjust
the clearances if necessary. These adjustments should be made for both the inside sewing position and outside sewing
position.

0.01 - 0.08mm

(Inside sewing position) (Outside sewing position)

0492B 0493B

Turn the upper shaft pulley (1) so that the tips of both the left and right eye loopers (2) are aligned with the needle center, and
then loosen the set screws (3) and adjust the clearances between the needle and the tips of the eye loopers (2) to 0.01 - 0.08
mm.
* These clearances must be uniform while the looper base is rotating (through 360 degrees). If they are not uniform, adjust
the center of rotation of the needle bar. (The center of rotation is already adjusted at the time of shipment from the factory.)
* After making this adjustment, carry out the adjustment procedures given in “7-9. Adjusting the spreader installation
positions”.

7-8. Adjusting the needle guard

If the needle count has been changed, always be sure to check the position of the needle guard, and adjust the position if
necessary. This adjustment should be made for both the inside sewing position and outside sewing position.

(Inside sewing position) (Outside sewing position)

0498B 0499B

Turn the upper shaft pulley (1) so that the tips of both the left and right loopers (2) are aligned with the needle center, and then
loosen the screw (5) and adjust the needle guard (3) so that it touches the needle (4).

NOTE:
If it crosses the needle more than necessary, it will place a load on the needle and this may cause the needle to break.
Alternatively, if it does not cross the needle at all, the tips of the loopers will interfere with the needle and skipped stitches
may occur.

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7-9. Adjusting the spreader installation positions

0494B

1. Loosen the set screw (4) and adjust spreader stopper L (5) so that the relative positions of the U-shaped part at the tip of
spreader L (1) and the lower thread guide hole (3) in the eye looper (2) are as shown in the illustration below.
2. Once adjustment is complete, tighten the set screw (4).
3. Loosen the set screw (8) and adjust the spreader stopper R (9) so that the top edge of the tip of spreader R (6) is aligned
with the top edge of the tip of looper R (7).
4. Once adjustment is complete, tighten the set screw (8).

NOTE:
Spreader L (1) and spreader R (6) should not protrude above the eye looper (2) or looper R (7) respectively. If they do,
skipped stitches or needle breakages may occur.

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 7. ADJUSTMENTS

7-10. Adjusting the spreader timing

Spreader R (1) (at inside sewing position) and spreader L (2) (at outside sewing position) must touch the spreader stoppers (3)
and (4) respectively and stop moving immediately before the needle bar reaches its lowest position.
* Adjustment can be carried out more easily if it is done in manual mode.

0500B 0501B

1. Tilt back the machine head.

2. Loosen the two screws (5), and then loose the set screw (6).
3. Turn the eccentric pin (7) to adjust.
4. After adjusting, tighten the set screw (6) and the two screws (5) in that order.

NOTE:
Make sure that spreader R (1) and spreader L (2) do not obstruct the needle after adjustment.

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7-11. Adjusting the height of the throat plate

<-00 and -01 specifications>

<-02 specifications>

(Viewed from the front)

(Viewed at an angle from above-right)

0560B 0561B

1. Remove the right-side work clamp plate (1).

2. Turn the looper base (2) so that it faces as shown in the illustration.
3. Loosen the screw (3), and then move gimp thread guide C (5) to a position where it will not obstruct turning of the screw (4).
4. Loosen the screw (4) by about 10 turns.
5. Loosen the set screw (6).
6. Move the vertical pin (7) to adjust the height of the throat plate (8) as follows.
<For -00 and -01 specifications>
Adjust so that the top of the throat plate (8) and the top of the needle plate (9) are at the same height.
<For -02 specifications>
Adjust so that the top of the throat plate (8) is 0.4 - 0.6 mm lower than the top of the needle plate (9).
NOTE:
• If the position of the throat plate (8) is too high, it may obstruct the movable knife and damage it.
• Press down gently on the throat plate (8) from above while adjusting it. If the adjustment is carried out while the throat
plate (8) is lifted up, the correct adjustment result will not be obtained.
7. Once adjustment is complete, tighten the screws that were loosened and return all other parts to their original positions.

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 7. ADJUSTMENTS

7-12. Changing the cutting length (Replacing the hammer)

The cutting length is determined by the length of the hammer. File or replace the hammer in order to change the cutting length.

<For -00, -01, -02-L2634/L3442 specifications> <For -02-L1422/L1826/L2230 specifications>

0463B

1. Loosen the knob screw (1), and then remove the hammer (2).
2. [If grinding the hammer (Refer to Figure A)]
Use a grinder to grind section <b> of the hammer so that cutting length + 1.5 mm = <a>.
3. [If installing a new hammer]
Push the hammer against the positioning pin (3) (or the hammer spacer (4)), and then tighten the knob screw (1).

NOTE:
If the knife that was being used previously is replaced by a knife with a different number, replace the hammer also. If the
same hammer is used for two or more different types of knife, different knife incisions will be formed on the hammer, and this
may cause problems with the accurate cutting of the material or may damage the knife.

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 7. ADJUSTMENTS

7-13. Adjusting the cutting surface of the hammer

<Adjustment procedure>
1. Remove the hammer. (Refer to the previous page for
instructions on removing the hammer.)
2. Check the cutting surface of the hammer. Refer to the
illustration at left, and if the cutting surface looks like (b) -
(d), file the cutting surface so that the knife incision is
made evenly on the cutting surface.
(a) Knife incision is correct
(b) Knife incision is too deep
(c) A different knife was used which produced an
overlapping knife incision
(d) Partial knife incision which is not being made
completely
3. If the material cannot be cut cleanly even though the
hammer has been ground correctly, also check whether
the tip of the knife is worn.
* If the tip is worn, replace the knife.
* Do not use the old hammer after the knife has been
replaced. If the same hammer is used, it may damage
the tip of the knife.

0504B

7-13-1. Filing the cutting surface of the hammer

The cutting pressure over the whole of the hammer should be
uniform so that the material will be cut cleanly. File the cutting
surface of the hammer so that the knife incision will be uniform
over the whole of the hammer.
* The hammer can be filed until a height of 20 mm remains.
* Use a flat file for filing the hammer.

Filing the cutting surface of the hammer on which the

knife incision is overlapping or has shifted
1. Grip the hammer in a vise.
2. Use the flat file to file the cutting surface of the hammer
until the knife incision disappears.

Filing the cutting surface of the hammer in which knife

incision is deep
1. Grip the hammer in a vise.
2. Use the flat file to file the cutting surface of the hammer
smoothly until a single knife incision can still be seen
faintly.
0505B
* Once filing is complete, install the hammer.

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7-13-2. Adjusting the contact between the knife and the hammer
The knife incision can be seen more clearly if the cutting surface of the hammer is filled over with a marker pen or similar.
1. Operate the hammer three times with the knife making a mark on it each time.
2. If the knife incision is not uniform, file the hammer. (Refer to the previous page for details on filing the hammer.)
3. Repeat steps 1 and 2 until the knife incisions are uniform.

<Contact adjustment method using thin paper>

The following method can also be used to adjust the contact.
1. Loosen the four screws (1).
2. Insert some thin paper into either of the gaps A or B
between the hammer bracket (2) and the cutter driving
shaft (3).
3. Tighten the four screws (1).
* Push the hammer bracket (2) in the direction of arrow
C and firmly upward in the direction of D shown in the
illustration so that there is no gap between the hammer
bracket (2) and the cutter driving shaft (3), and then
tighten the screws.
(This operation will position the hammer bracket (2))
accurately by pushing the pin (4) of the hammer
bracket (2) against the hole side of the cutter driving
shaft (3).)

0464B

7-14. Adjusting the axial play of the hammer

If there is too much axial play in the hammer, carry out the
following adjustment.
1. Loosen the two nuts (1).
2. Tighten the two screws (2) slightly to adjust while checking
the amount of play.
3. When the hammer bracket (3) is pushed downward by
hand, check that the built-in extension spring (4) causes it
to return correctly.
* If the hammer bracket (3) does not return correctly, it
may obstruct the work clamps and damage may result.
4. Once adjustment is complete, tighten the two nuts (1).

0470B

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7-15. Making the cutter driving shaft and driving shaft presser move together
The cutter driving shaft (2) and driving shaft presser (3) are linked by an extension spring (4) so that the hammer bracket (1) can
be positioned by being pushed down by hand when aligning the needle with an eyelet buttonhole that has already been made
in the material in order to resume sewing. If this extension spring (4) has been damaged, or if the return speed of the cutter is
too slow, the cutter driving shaft (2) and the driving shaft presser (3) can be made to move together as a single unit.

0502B 0503B

1. Turn the cock (5) in the direction of the arrow to close it and stop the supply of air.
2. Press the button (6) to release the air.
NOTE:
When the air is released, the hammer may lower by its own weight.
3. Remove the upper cover (7) and the face plate (8).

0473B 0472B

4. Lower the cylinder rod (9) to align the screw (A) of the cutter driving shaft (2) with (B) inside the face plate.
5. Use a commercially-available set screw (6) (M6 with a length of 6mm or less) to secure (A) and (B) together.
* Tighten the set screw (10) securely. If the set screw (10) is loose and protrudes from the surface of the cutter driving shaft
(2), damage may result.
6. Install the face plate (8) and the upper cover (7), and then open the cock (5) to resume the supply of air.

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7-16. Replacing the knife and adjusting its position

7-16-1. Replacing the knife

CAUTION
Do not operate the sewing machine while a knife and hammer with numbers that are different from those which have
been set in programs.
If this is not observed, damage to sewing machine parts or the needle or serious injury may occur.

0467B

<For -00, -01, -02-L2634/L3442 specifications> <For -02-L1422/L1826/L2230 specifications>

0466B 0468B

1. Check that there is no gap between the block stopper plate (1) and the knife (2), and then loosen the socket bolt (3) and
remove the knife (2).
2. Place the new knife to be installed against the block stopper plate (1), and then tighten the socket bolt (3).

NOTE:
• When replacing the knife, use the parameter settings to change the eyelet pattern to the pattern that corresponds to the
knife number (4) that is given on one side of the knife. (Refer to “5-3-1. Parameter list” in the instruction manual.)
• Replace the knife and hammer as a set. If the same hammer is used for two or more different types of knife, different knife
incisions will be formed on the hammer, and this may cause problems with the accurate cutting of the material or may
damage the knife.

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7-16-2. Making fine adjustments to the knife position

Adjust the knife position so that it cuts the material cleanly at the inside sewing position and around the eyelet.
* Before carrying out this adjustment, check that the procedure in “7-3. Adjusting the zigzag base line position” has been
completed correctly.
* The knife position can be adjusted independently in the forward/back direction and tilt direction.

<Adjustment procedure>
1. Install the short customized needle (1).
(Refer to “7-3. Resetting the data (initialization)” in the
instruction manual for details on the short customized
needle (1).)
2. Set the air pressure at the hammer pressure adjustment
regulator on the underside of the table to about 0.2 MPa.
15mm (Refer to “7-17. Adjusting the cutting pressure”.)
* This is so that the knife will not make several
overlapping incisions in the hammer and so that the
paper for checking the needle drop does not become
pierced while adjusting the knife position.
0417B

0397B 3. Press the AFTER key (2) on the operation panel to set the
cutting method to “cutting after sewing”.

0431B 4. Place a piece of paper (3) underneath the work clamps.

5. Start the sewing machine and trace the needle drop
position around the eyelet hole.
6. Check that the needle drop positions around the eyelet
hole and the knife cutting position overlap uniformly.
* Checking will be easier if the cutting position value (A)
in the parameter settings is set to “0”. (Refer to “5-3-1.
Parameter list” in the instruction manual.)
7. If they do not overlap uniformly, turn off the power and
carry out the adjustment in steps 8 - 13.
* Once adjustment is complete, repeat steps 4 - 6 to
check, and if further adjustment is needed, repeat step
7.

0555B (Continued on next page)

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<Forward/back position adjustment>

0557B

<For -00, -01, -02-L2634/L3442 specifications> <For -02-L1422/L1826/L2230 specifications>

0556B

8. Loosen the socket bolt (4), and move the knife position forward or back to adjust.
9. Once the knife position has been determined, securely tighten the socket bolt (4).
10. Loosen the screw (5), push the block stopper plate (6) against the knife, and then tighten the screw (5).
* The block stopper plate (6) is a guide for showing the current position of the knife, so be sure to move the block stopper
plate (6) so that it is touching against the knife.

0558B <Tilt adjustment>

11. Loosen the socket bolts (7), (8) and (9).
12. Turn the eccentric pin (10) to adjust.
* Fine adjustments can also be made by turning
centering on the pivot (11).
13. Once adjustment is complete, tighten the socket bolts (9),
(8) and (7) in that order.

(Viewed from directly above the knife base)

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NOTE: Relationship between needle drop position and eyelet pattern at the eyelet
0559B
When switching between cutting before sewing or no cutting
Eyelet pattern a x b and cutting after sewing, the needle drop position at the inside
sewing position will change automatically in accordance with
the eyelet pattern as shown in the illustration.

Needle drop c x d
Eyelet pattern
Knife axb Cutting before Cutting after
No. sewing or no cutting sewing
1 2.1 x 3.2 1.7 x 2.7 2.5 x 3.8
2 2.8 x 4.3 2.4 x 3.9 3.2 x 4.9
3 3.0 x 4.6 2.6 x 4.1 3.4 x 5.2
Needle drop c x d 4 3.2 x 5.4 2.8 x 4.9 3.6 x 6.0
5 Straight Straight Straight
6 3.8 x 4.3 3.4 x 3.8 4.2 x 4.9

Cutting before sewing Cutting after sewing

7-17. Adjusting the cutting pressure

Set the cutting pressure to the minimum pressure that still
allows the material to be cut.
* Set to between 0.1 - 0.6 MPa. (It is set to 0.4 MPa at the
time of shipment from the factory.)

<Adjustment method>
Turn the knob (1) of the hammer pressure adjustment
regulator on the underside of the table to adjust the air
pressure.

NOTE:
• Do not increase the cutting pressure more than necessary.
If the pressure is too high, it will wear out the hammer and
damage the knife.
• If the material cannot be cut cleanly, do not increase the
cutting pressure to too high a pressure.
Check the timing between the knife and the hammer.
(Refer to “7-13-2. Adjusting the contact between the knife
and the hammer”.)

0469B

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7-18. Adjusting the work clamp lift amounts

Adjust the work clamp lift amount <a> to one of the values given below.
<For -00, -01 specifications>: 12 mm
<For -02 specifications>: 16 mm
* The work clamp lift amount <a> is the value which includes the play in crank lever B (1) and the clamp lever (2).
* Carry out adjustment for both the left and right work clamps. (The following describes how to adjust the lift amount for the
right-side work clamp.)
1. Remove the two screws (3), and then remove feed base
cover U (4).
2. Remove the six screws (5) and the shoulder screw (6),
and then remove feed base cover R (7) at the right side.

0508B

(Viewed from directly to the right)

0509B

3. Insert a block with a thickness of 12 mm or 16 mm or a gauge (10) in between the support point of work clamp R (8) and the
needle plate (9).
4. Loosen the screw (12) of the clamp driving lever (11).
5. Push section (B) of crank lever B (1) upward so that the tip (13) is pressed against the end of clamp lever R (2) as shown in
the illustration.
6. While holding the parts in the position in step 5, tighten the screw (12).
NOTE:
Check that work clamp R (8) is pressed securely against the block or the gauge (10).
7. Install feed base cover R (7) and feed base cover U (4).
* Adjust the lift amount for the left-side work clamp in the same way.

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7-19. Adjusting the work clamp positions

The positions of the work clamps relative to the needle plate can be adjusted forward, back and sideways.
* Adjust the left and right work clamps so that they are both positioned at an equal distance from the needle drop position.
(The following describes how to adjust the position of the right-side work clamp.)

(Viewed from directly to the right)

0511B

<Forward/back adjustment>
1. Loosen the socket bolt (1), and then move the position of the clamp arm (2) forward or back to adjust.
2. Next, adjust so that the side of work clamp R (3) is parallel to the side of the needle plate (4).
3. Once adjustment is complete, tighten the socket bolt (1).

<Sideways adjustment>
1. Loosen the two set screws (5), and then adjust the sideways position of the clamp lever (6).
2. Once adjustment is complete, tighten the two set screws (5).

* Adjust the position for the left-side work clamp in the same way.

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7-20. Adjusting the positions of the work clamp plates

Adjust the positions of the work clamp plates (3) so that the throat plate (1) and needle plates (2) do not touch during sewing.
The standard adjustment is when there is a gap of 0.8 mm between the throat plate (1) and the needle plates (2) (when the
cutting space is set to "0").
* Carry out adjustment for both the left and right work clamps. (The adjustment method described below is for the position of
the right-side work clamp plate (3).)
* Carry out adjustment with the work clamp plates (3) installed.

0512B 1. Use the parameter settings to set the cutting space to “0”.
(Refer to “5-3-1. Parameter list” in the instruction manual.)
* If you press shortcut key 3 (4), you can then change
the value simply by pressing the / keys (5).
2. Press the TEST key (6) to turn on test mode, and then
start test operation. (Refer to “5-4. Checking the sewing
pattern in test mode” in the instruction manual.)
3. Press and hold the start switch (7) until the feed base
moves to the position where the straight section of the
sewing shape is sewn, and then release the start switch
(7).

Straight section

(when using a 2-pedal 0513B

foot switch)
0462B

Narrow gap
Wide gap

(Viewed from the front) (Viewed from directly above)

4. Check that there is a gap of 0.8 mm between the throat plate (1) and needle plate R (2).
5. If it is not 0.8 mm, remove feed bar cover L (8) and feed bar cover R (9), loosen the nut (10), and then turn the bolt (11) to
adjust the gap.
6. Once adjustment is complete, tighten the nut (10).
7. Press the RESET key (12), and then press the STOP switch (13) to end test mode.
* Adjust the gap between the throat plate (1) and needle plate L in the same way.

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7-21. Adjusting the cloth opening amounts

Adjust so that the opening amounts for the left and right work clamp plates (1) are equal.
* The cloth opening amounts should always be 0.8 mm or more on each side.

0515B <Opening amount measurement method>

1. Press the TEST key (2) to turn on test mode, and then
start test operation. (Refer to “5-4. Checking the sewing
pattern in test mode” in the instruction manual.)

(When using a
2-pedal foot switch)
2. Depress the start switch (3).
* Check that the feed base moves and that the work
clamp plates (1) at left and right both open. This
opening amount is <a>.

0516B

Cloth opening amount = <b> - <a>

0517B

3. Use calipers to measure <a> (at both left and right).

4. Turn off the power for the sewing machine.
* The gap <a> will become wider. This opening amount is <b>.
5. Lower the work clamps, and then use calipers to measure <b> (at both left and right).
(Cloth opening amount = <b> - <a>)
6. Calculate the cloth opening amounts for both sides.
7. Carry out adjustment if the two cloth opening amounts are not the same, or if the cloth opening amount at either side is lower
than 0.8 mm. (Refer to following page.)

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<Cloth opening amount adjustment>

0518B

8. Loosen the screw (4).

9. Insert a screwdriver into the notch in the side of the feed base, and turn the adjustment screw (5) to adjust.
10. After tightening the screw (4), measure the opening amounts once more.
11. Repeat steps 2 - 10 until the left and right cloth opening amounts are equal to each other.

7-22. Adjusting the upper thread feeding amount

It is necessary for enough of an upper thread feeding amount to be maintained so that the amount of upper thread is sufficient
for stitches to be formed accurately at the sewing start.
NOTE:
The thread take-up lever (1) operates at the same time as sewing ends, and it stops operating at the same time as the feed
base starts moving when the start switch is pressed.

More thread

Less thread

0477B

1. Loosen the screw (2).

2. Move the thread take-up lever (1) up or down to adjust the upper thread feeding amount.
3. Once adjustment is complete, securely tighten the screw (2).

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7-23. Adjusting the lower thread feeding amount <-01 specifications only>
It is necessary for enough tension to be applied to the lower thread during the time from when the upper thread is picked up by
the eye looper at the first stitch until spreader L finishes opening, without the lower thread being pulled out by the thread nipper,
so that the first stitch can be sewn correctly at the sewing start.

0399B
1. After automatic sewing is finished, switch to manual mode
and then press the start switch. (Refer to “7-6. Manual
sewing (manual mode)” in the instruction manual.)
2. Turn the upper shaft pulley and check the condition of the
lower thread.

<If adjustment is necessary>

3. Turn off the power, and then tilt back the machine head.
4. Loosen the two screws (1), and then move lower thread
guide C (2) in the direction of the arrow to adjust.
* If it is moved to the right, the lower thread feeding
amount will increase, and if it is moved to the left, the
amount will decrease.
5. Once adjustment is complete, securely tighten the two
screws (1).

Becomes less Becomes more

7-24. Replacing and adjusting the upper movable knife

7-24-1. Replacing the upper movable knife
1. Remove the screw (1), and then remove the upper
movable knife (2).
2. Install the new upper movable knife with the screw (1).

<-00 and –01 specifications> <-02 specifications>

<-00 and -01 specifications> <-02 specifications>

0401B

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7-24-2. Adjusting the upper movable knife

The upper movable knife (1) is adjusted so that only the upper thread that is in front of looper L (2) is cut. If two of the upper
thread loops (front and back) are cut, the upper thread trailing length will become too short and skipped stitches may occur at
the sewing start.
* If this adjustment is carried out in manual mode, the upper thread trimming operation can be checked step by step, which
will make adjustment easier.

1. Turn the upper shaft pulley to set the needle to the lowest
position at the outside sewing position.
2. Loosen the screw (3), and then adjust the gap <a>
between the tip of the upper movable knife (1) and the
needle to 0.1 - 0.4 mm.
3. Turn the upper shaft pulley to set the needle to its highest
position (needle up stop position) at the outside sewing
position.
4. Loosen the screw (4), and then adjust the position of the
upper movable knife (1) so that it is in between the throat
(Viewed from directly to the right) plate (5) and spreader L (6) without touching either of
them.
5. Move the upper movable knife (1) sideways by hand and
check that it does not touch either the throat plate (5) or
spreader L (6).
6. Once adjustment is complete, tighten the screws (4) and
(3) in that order.

0403B

NOTE: Upper thread trimming timing

<-00 and -01 specifications>
When the upper movable knife (1) has returned to its original
position, the upper thread is trimmed at position A.
<-02 specifications>
When the upper movable knife (1) starts moving, the upper
thread is trimmed at position B.

<-00 and -01 specifications> <-02 specifications>

0565B

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7-24-3. Adjusting the position of the thread trimmer lever bracket

The position of the needle must be adjusted so that it does not obstruct the upper movable knife when it is at the maximum
zigzag width for the outside sewing position.

0545B
1. Loosen the nut (1).
2. Turn the screw (2) to adjust <a> in the illustration to 12
mm.
3. Turn the looper base (3) and check that the thread trimmer
lever bracket (4) moves underneath the thread trimmer
hammer (5) without obstructing any other parts.
4. Once adjustment is complete, securely tighten the nut (1).

(Viewed from the front)

0546B

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7-25. Replacing and adjusting the movable knife and fixed knife (for the
lower thread and gimp) <-01 specifications>
7-25-1. Replacing the movable knife and fixed knife
0519B
1. Remove the two screws (1), and then remove work clamp
plate U (2).

<Movable knife replacement>

2. Remove the three screws (3), and then remove the
movable knife (4).
3. Install the new movable knife, and then tighten the three
screws (3).

<Fixed knife replacement>

4. Remove the two screws (5), and then remove the fixed
knife (6).
5. Install the new fixed knife (6), fixed knife plate spring (7),
fixed knife plate spring U (8) and thread guide plate (9) on
top of each other in that order, and then tighten the two
screws (5).

* After replacing the knives, carry out the adjustments from

“7-25-2. Adjusting the cutting pressure” to “7-25-5.
Adjusting the thread handler”. Once adjustment is
complete, install work clamp plate U (2).

0520B

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7-25-2. Adjusting the cutting pressure

Adjust the cutting pressure to a suitable pressure so that the threads are trimmed cleanly.
NOTE:
Do not apply excessive pressure. Excessive pressure will cause the knives to become worn or damaged.

0521B

1. Push the thread trimmer arm (1) as far as it will go in the direction of the arrow [A].
2. Loosen the two screws (2).
3. With the thread trimmer arm (1) pushed as far as it will go, move the fixed knife setting bracket (6) along the guide groove in
the direction of arrow [B] to adjust so that the position where the tip of the fixed knife (3) and the movable knife (4) first start
touching is immediately above the mark (5).
4. Once adjustment is complete, securely tighten the two screws (2).

7-25-3. Adjusting the meshing amount

1. Turn the thread trimmer link lever (1) in the direction of the
arrow until it touches the screw (2).
2. Loosen the socket bolt (3).
3. Adjust the position of the thread trimmer arm (7) so that
the tip of the fixed knife (6) is directly above the index mark
(5) on the movable knife (4).
4. Once the adjustment is complete, securely tighten the
socket bolt (3).

NOTE:
• When tightening the socket bolt (3), check that the thread
trimmer lever arm (8) and the thread trimmer arm (7) move
smoothly with no play.
• If the meshing amount is too small, problems with the
lower thread nipper will occur and the thread will be pulled
out at the sewing start.

0522B

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7-25-4. Adjusting the thread nipper assembly and opener

The lower thread must pass through thread nipper D (1) and the gimp thread must pass through thread nipper U (2). Therefore,
check that the thread nipper assembly (3) is installed in the correct position and that the thread nipper opener (4) moves
correctly.
NOTE:
The lower thread must be securely held by thread nipper D (1) at the sewing start.

(Side view of thread nipper assembly (3) and the thread handler (7) viewed from position A)

0523B

1. Loosen the two screws (5), and then move the thread nipper assembly (3) along the dotted line [A] in the illustration in the
direction of the arrow [B] to adjust.
* Adjust so that the gap <a> between the thread nipper assembly (3) and the thread handler (7) is as narrow as possible
without the two parts touching when the thread trimmer arm (6) is turned in the direction of the arrow [C].
NOTE:
• If the gap <a> is too wide, problems with the lower thread nipper will occur and the thread will be pulled out at the sewing
start.
• If the thread nipper assembly (3) is installed at an angle, thread nipper D (1) may touch the throat plate and fail to open,
and problems with the lower thread nipper will occur and the thread will be pulled out at the sewing start.

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2. The lower thread must go over the projection (9) on thread

nipper M (8) and be held securely. To make sure this
happens, check that the operations in (a), (b) and (c)
below are all correct.

0552B

0553B (a) Thread nipper D (1) should open by 0.3 mm or more

when the thread nipper opener (4) pushes down on the
opener pin (10).

(b) Thread nipper D (1) should close immediately before

the thread is trimmed.

0.3 mm
or more

(c) Thread nipper D (1) should not open when the thread
trimmer arm (6) returns after thread trimming, so that
the thread nipper opener (4) returns without going over
the opener pin (10).

3. Once adjustment is complete, securely tighten the two

0554B screws (5).

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7-25-5. Adjusting the thread handler

The lower thread and gimp are securely separated and guided by the thread handler (1), after which the lower thread needs to
go smoothly into thread nipper D (2), while the gimp needs to go smoothly into thread nipper U (3).
NOTE: Principle of the thread handler
When the thread trimmer arm operates, the throat plate (4) turns 45 degrees. This causes the gimp to sit on top of the
projection (5) of the throat plate (4) so that a difference in height is created between the lower thread and the gimp, and a
triangular shape (A) is formed between the two threads and the final stitch. The thread handler (1) goes into this triangular
shape (A) to separate the lower thread and gimp.

Gimp Lower thread

Gimp
Material

Lower thread

Lower
thread
Gimp

Gimp

Lower thread

0525B

<Adjustment method>
* If this adjustment is carried out in manual mode, the lower thread trimming operation can be checked step by step, which will
make adjustment easier.
1. Use the parameter settings to set the stitch pitch to 2.0 mm and reduce the total number of stitches. (Refer to “5-3-1.
Parameter list” in the instruction manual.)
2. In manual mode, depress the start switch, and then turn the upper shaft pulley to sew manually as far as the final stitch.
(Refer to “7-6. Manual sewing (manual mode)” in the instruction manual.)
3. With the needle bar at the needle up stop position, depress the start switch one press at a time.
* The thread trimming operation will be carried out one step at a time.
4. Loosen the pan screw (6) and the screw (7), and then use the pan screw (6) as a pivot to turn the thread handler (1) to
adjust.
5. Once adjustment is complete, securely tighten the pan screw (6) and the screw (7).

NOTE:
If the height of the throat plate (4) has been changed, the triangular shape (A) defined by the final stitch, lower thread and
gimp will change, and so you should adjust the thread handler (1).

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7-26. Replacing and adjusting the movable knife and fixed knife (for the
lower thread and gimp) <-02 specifications>
7-26-1. Replacing the movable knife and fixed knife
1. Remove the two screws (1), and then remove work clamp
plate U (2).

2. Remove the nut (3).

3. Remove the shoulder screw (4), and then remove
movable knife L (5) and movable knife R (6).
4. Install the new knives, and then install the shoulder screw
(4).
5. Adjust the cutting pressure (see below), and then tighten
the nut (3).
6. Install work clamp plate U (2).

0526B

7-26-2. Adjusting the cutting pressure

Adjust the cutting pressure to the minimum pressure at which
thread trimming can be carried out cleanly.

1. Loosen the nut (1).

2. Turn the shoulder screw (2) to adjust the cutting pressure.
NOTE:
If the shoulder screw (2) is tightened as far as it will go,
the movable knives will no longer operate. Gradually
loosen the shoulder screw (2) to a point where the
movable knives turn smoothly.
3. Once adjustment is complete, securely tighten the nut (1).

0527B

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 7. ADJUSTMENTS

7-26-3. Adjusting the movable knife installation position

(Viewed from directly above)

(Viewed from the side at position B)

(Viewed from underneath)

0528B

1. Remove work clamp plate U. (Refer to “7-26-1. Replacing the movable knife and fixed knife”.)
2. Loosen the screw (1).
3. Turn the movable knife driving plate (4) so that the tip [A] of movable knife R (3) and the corner [C] of the needle plate (2) are
aligned.
4. Turn thread trimmer lever arm B (7) until the thread trimmer link lever J assembly (5) touches against the screw (6), and then
tighten the screw (1).
5. Once adjustment is complete, install work clamp plate U.

NOTE:
Check that the movable knife driving plate (4) and thread trimmer lever arm B (7) turn smoothly with no play.

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 7. ADJUSTMENTS

7-26-4. Adjusting the position of the sub clamp

Trimming of the lower thread and gimp is carried out when the work clamps rise. The sub clamp ensures that the material does
not move during thread trimming, in order to maintain a stable thread length after trimming.

1. Loosen the socket bolt (1).

2. Adjust the installation position of the sub clamp wrist (4)
with respect to the article being sewn so that the button
clamp (2) moves above the needle plate (3).
3. Once adjustment is complete, securely tighten the socket
bolt (1).

0530B

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 7. ADJUSTMENTS

7-26-5. Differences from older models

RH-9820 RH-981A

-00,-01 1189B 1190B

-00,-01
-02: L2634, L3442 -02: L5, L6, L7
-02:L1422,L2230
L1826 -02: L1, L2, L3, L4
(Position when S
(Position when S
hammer is being used)
hammer is being used)

* In order to ensure
Knife installation
interchangeability with the * Because there is a shift of
position
RH-981A hammer, install the 10 mm, the S-- hammer is
hammer spacer (SA6800-001) to offset.
the hammer mounting bracket
when using a S-- hammer. (Refer
to “7-16-1. Replacing the knife”.)

1192B

1191B L5, L6, L7

L3442
L1, L2, L3, L4
L2634
L2230 L1
L1826 L2, L5
L1422 The maximum L3, L6
lengths for each L4, L7
size are aligned with
point P.

Needle plate
8 (Cutting range)

position viewed
from work clamp
plate

Knife positions are aligned.

Advantage： The left and right movable knives do not

need to be replaced.
Note：The feed base position when the material is set Advantage： The feed base position when the
back varies depending on the size. material is set back s the same
for all sizes.
・Needle plate L and R ・Needle plate L and R
L specifications ・Work clamp L and R ・Movable knife L and R
changed
・Specification harness
(replacement Total 4 points
parts) ・Work clamp L and R
Total 7 points

Other settings Settings for memory switch No. 851 changed －

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 NOTE:
When the material is set back and when the knife is lowered, the position of the feed base varies depending on L specifications (size).

L1826 L1422 L2230 L2634 L3442

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Knife
position
shifted

RH-9820
Cutting
Cutting Cutting Cutting range Cutting
range range range range

Feed base shifted Feed base shifted

178
7. ADJUSTMENTS
 7. ADJUSTMENTS

7-27. Adjusting the gimp trailing length <-02 specifications only>

The gimp is pressed against the material by means of the twisting of the first 2 - 3 stitches at the sewing start, and is then pulled
out continuously. Because of this, if strong tension is applied to the gimp when the feed base is at the sewing position and the
gimp trailing length (<a> in the illustration below) becomes extremely short, the gimp may be pulled out of the stitches.
The gimp should be adjusted to as short a length as possible which will still allow the gimp to be securely wound around the
stitches at the sewing start and leave a length protruding from above the stitches.
NOTE: Principle of gimp pulling
When the looper base (1) turns back from 180 degrees to 0 degrees after the gimp has been trimmed, gimp thread guide
C-J (2) pulls the gimp to make it come out.
Adjustment of the gimp trailing length is necessary in the following cases.
• When the sewing length has been changed (the gimp is trimmed at the feed base home position, so the length of <b>
will change. As a result, the gimp trailing length <a> will also change.)
• When the type of gimp and the gimp tension have been changed (the gimp trailing length <a> will change.)

Gimp is trimmed

When looper base is turned 180 degrees When looper base has returned to 0 degrees

(Viewed from directly above)

0547B

0548B <Adjustment method>

1. Loosen the screw (3).
2. Move gimp thread guide J (4) in the direction of the arrow
[A] to adjust so that 2 - 4 mm of the gimp protrudes from
the seam at the sewing start.
3. Once adjustment is complete, securely tighten the screw
(3).

The gimp trailing length at the sewing end is uniform because of

thread trimming.

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 7. ADJUSTMENTS

7-28. Adjusting the position of the lower thread presser <-02 specifications only>
Adjust the lower thread presser (1) so that it securely holds the lower thread.

0549B
0550B
0551B

(Viewed from the front)

(Viewed from directly above) (Viewed from directly to the right)

1. Loosen the screw (4) and move the lower thread presser (1) up or down to adjust so that its top projects approximately 0.5
mm from the top of the thread groove (3) in the throat plate (2).
2. Check that the lower thread presser (1) does not cover the groove at the front of the throat plate (2).
* If the groove is covered, loosen the nut (5) and then turn the screw (6) to adjust.
3. Check that the front of the throat plate (2) and the lower thread presser (1) are overlapping by 0.5 - 1.0 mm after thread
trimmer lever bracket B (7) has operated.
* If adjustment is required, remove the lower thread presser base (8), loosen the nut (9), and then turn the screw (10) to
adjust.
4. Once adjustment is complete, tighten the nuts (5) and (9) that were loosened, and install the lower thread presser base (8).

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 7. ADJUSTMENTS

7-29. Adjustment of the phase for the take-up roller cam

0751B

1. Remove the upper cover (1).

2. Loosen the two set screws (3) of the take-up roller cam (2).
3. Remove the face plate (4).
4. Set the sewing machine to the stopped position.
5. Remove the rubber cap (5) and then insert the accessory pin (6).
* Check that the pin (6) is inserted into the groove (A) in the upper shaft crank at this time so that the upper shaft is secured
and cannot be turned.
6. Remove the upper shaft pulley (7).
7. Remove the rubber cap (8), and then insert the accessory pin (9) into the hole in the take-up roller cam (2).
8. Push the take-up roller cam (2) against the edge of the bearing (B), and then tighten one of the set screws (3).
9. Pull out the pins (6) and (9) and then tighten the other set screw (3).
10. Once adjustment is complete, install the rubber cap (8), rubber cap (5), upper shaft pulley (7), face plate (4) and upper cover (1)
in that order.

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 7. ADJUSTMENTS

7-30. Adjusting the needle bar and looper base turning center
The turning center for the needle bar and the looper base is accurately adjusted at the time of shipment from the factory.
If the sewing machine has been disassembled (such as when replacing the needle bar gear block unit, needle bar or looper base),
adjust the position of needle bar bush U (2) so that the clearance <a> between the needle and the tip of eye looper (1) remains
uniform while the looper rotates through 360°.
NOTE:
Before adjusting the position of the needle bar bush U (2), check that there is no play in the needle bar gear block and the
looper base. If there is any play, adjust while referring to “6-2. Needle bar mechanism (1): Adjusting the pressure of the needle
bar gear block” and “6-8. Looper base mechanism: Looper base pressure adjustment”.

Needle
Eye looper(1)

When looper base is at 0° When looper base is at 180°

Index mark

When looper base is at 90° When looper base is at 270°

0752B 0753B

<Adjustment>
1. Loosen the two bolts (3), and then remove the needle bar guard (4).
2. Turn the upper shaft pulley until the tip of the eye looper (1) is aligned with the center of the needle.
3. Turn the looper base (5) by hand and check that the distance A between the tip of eye looper (1) and the needle when the looper
base (5) is turned to 0° is the same as the distance B when the looper base is turned to 180°.
4. If there is a large difference between distance A and distance B, loosen the three bolts (6) and move the needle bar (7) gently
forward or back to adjust the position of needle bar bush U (2). Tighten the bolts (6), and then repeat the check in step (3).
5. Turn the looper base (5) by hand and check that the distance C between the tip of eye looper (1) and the needle when the
looper base (5) is turned to 90° is the same as the distance D when the looper base is turned to 270°.
6. If there is a large difference between distance C and distance D, loosen the three bolts (6) and move the needle bar (7) gently to
the left or right to adjust the position of needle bar bush U (2). Tighten the bolts (6), and then repeat the check in step (5).
7. Carry out the check in step 3 once more.

NOTE:
• Once adjustment is finished, turn the upper shaft pulley and check that the needle bar moves gently up and down.
• If a sheet of paper is placed under the needle and the needle drop position is adjusted so that the needle makes a single hole in the
paper, the distance <a> between the needle and the tip of eye looper (1) will still not be uniform.

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 7. ADJUSTMENTS

7-31. Adjusting the upper thread loosening amount

0754B

1. With the plunger (2) of the upper thread tension release solenoid (1) pushed all the way in, loosen the nut (5) and turn the bolt
(3) to adjust so that the clearance between the end of the bolt (3) and the solenoid setting plate (4) is 13.8 mm.
2. With the upper thread tension release solenoid (1) installed to the upper cover (6), check that the opening amount for the
tension discs (7) is 0.5 - 1 mm when the plunger (2) is pushed all the way in.
* Section (A) should be sealed at this time.

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 7. ADJUSTMENTS

7-32. Adjusting the lower thread loosening amount

0781B

1. Loosen the nut (1).

2. Turn the lower thread release plate (2) by hand or push the plunger (3) of the tension release solenoid from the back to turn the
lower thread release plate (2) until the tension release pin (4) is sitting on stepped part [A].
3. Turn the tension stud D (6) to adjust the height so that the opening amount for the tension discs (5) is 1 ± 0.3 mm at this time.
4. Tighten the nut (1).

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 7. ADJUSTMENTS

7-33. Adjusting the looper base home position

NOTE:
Before carrying out this adjustment, check that the adjustments in “6-9. Needle bar rocking mechanism: Belt tension adjustment
for driving looper belt” have been carried out correctly.

0749B

1. Remove the left and right work clamp plates (Z).

2. While holding down the and keys (1), push the

POWER switch at the ON side (2).

0763B

3. Press the start switch (3).

The motors will carry out home position detection, and then
the sewing machine will switch to home position adjustment
mode.
* At this time, “X” will appear in the display (A).
4. Press the or key (4) to change the display (A) to “θ”.
* When “θ” is displayed, the X and Y feed motors will be
turned off, so that the feed base can be moved by hand.

(A)

0972B
0819B

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 7. ADJUSTMENTS

5. Press the or key (1) to change the offset value (B).

The looper base (5) will move as the keys are pressed. Do
this until the looper base reference line (0°) <b> is aligned
with the bed reference line <a>.
* The setting range is -12.86 ° - +12.86° (in units of 0.64°).
6. Press the ENTER key (6).
The home position detection operation will be carried out,
and the offset value (B) will be saved.
NOTE:
(B) If you continue to the next step without pressing the
ENTER key (6), the offset value will not be changed.
7. Check that the bed reference line <a> and the looper base
reference line (0°) <b> are aligned.
* If they are not aligned, repeat steps 5 and 6 until they
are aligned.
8. Press the TEST key (7).
Home position adjustment mode will end and the sewing
machine will return to home position standby.

1194B
0764B
0733B

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 7. ADJUSTMENTS

7-34. Adjusting the feed base X home position and Y home position
NOTE:
* Before adjusting the X home position, check that the adjustment in “6-16. X feed mechanism: Standard installation position for
motor unit (idle gear adjustment)” has been carried out correctly.
* Before adjusting the Y home position, check that the adjustment in “6-7. Y feed mechanism: Standard installation of motor unit”
has been carried out correctly.

0749B

1. Remove the left and right work clamp plates (Z).

2. While holding down the and keys (1), push the

POWER switch at the ON side (2).

0763B

3. Press the start switch (3).

The motors will carry out home position detection, and then
the sewing machine will switch to home position adjustment
mode.
* At this time, “X” will appear in the display (A).
4. Press the or key (4) as necessary to change the
display (A) so that “Y” appears.
* “X” or “Y” should be displayed while this adjustment is
carried out.

(A) [When “X” is displayed]

The motor (θ) for driving the looper base will be turned off,
so that the looper base and needle bar gear block can
be moved by hand.
[When “Y” is displayed]
The X-feed motor, Y-feed motor and motor (θ) for driving
the looper base will all be turned on, so that the looper
base and needle bar gear block cannot be moved by
hand.
(B)

0972B
0819B

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 7. ADJUSTMENTS

5. [Adjusting the X home position]

(When the looper base is turned 0°)

(When the looper base is turned 180°)

0765B

Carry out the following adjustments so that the distances <a> (when the looper base is turned 0°) and <b> (when the looper
base is turned 180°) between the end of the projection on the throat plate (5) and the sides of feed base cover R (6) and feed
base cover L (7) on the feed base are equal.
5-1. Turn the looper base by hand and measure the distances <a> and <b>.

5-2. When you press the or key (1) to change the

offset value (B), the feed base (7) will move as the keys
are pressed. Repeat this step until distances <a> and <b>
are equal.
* The setting range is -2.00 - +2.00 mm (in units of 0.05
mm).

0818B

[Adjusting the Y home position]

Carry out the following adjustments so that the distance <c>
between the rear of the feed base (7) and the hollow in the bed
(8) is 18 ± 0.2 mm.
5-3. When you press the or key (1) to change the
offset value (B), the feed base (7) will move as the keys
are pressed.
* The setting range is -2.00 - +2.00 mm (in units of 0.05
mm).

0766B

(Continued on next page)

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 7. ADJUSTMENTS

6. Press the ENTER key (9).

The home position detection operation will be carried out,
and the offset value (B) will be saved.
NOTE:
If you continue to the next step without pressing the
ENTER key (9), the offset value will not be changed.
7. Check the results of the adjustments.
* If the adjustments are not correct, repeat steps 5 and 6.
* To continue with another adjustment, repeat the
adjustment procedure from step 4.
8. Press the TEST key (10).
Home position adjustment mode will end and the sewing
machine will return to home position standby.

0767B

7-35. Adjusting the needle up signal home position for the upper shaft and
upper shaft motor
NOTE:
• Before carrying out this adjustment, check that the adjustments in “6-18. Upper shaft motor mechanism: Standard installation of
upper shaft motor unit and belt tension adjustment)” and “6-10. Lower shaft mechanism: Belt (upper shaft - lower shaft)
installation and belt tension adjustment” have been carried out correctly.
• After carrying out this adjustment, be sure to carry out the procedure in “7-36. Adjusting the upper shaft stop position”.
0768B

1. Remove the face plate (1) and the upper cover (2).
2. Remove the rubber cap (3).
3. Insert the accessory pin (4) into the groove (6) in the balance collar from the hole (5) in the arm to stop the upper shaft from
turning. (Upper shaft: 22.5° position)

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 7. ADJUSTMENTS

4. While holding down the key (7), push the POWER

switch at the ON side (8).
The mode will switch to input checking mode.
5. Press the key (7) or key (9) to set the checking
signal (A) to “18 (needle up signal)”.

(A)

0769B
0784B

0770B 6. Tilt back the machine head and remove the motor cover (11)
0784B
from the upper shaft motor (10).
7. Loosen the bolt (12) for the needle up magnet of the motor
by 90° only.
NOTE:
Do not loosen the screw by more than 90°. If it is
loosened too much, the parts may touch the P. C. board
and damage may result.
8. Move the position of the slot (13) to the point where the
panel display (B) switches from “ON” to “OFF”, and tighten
the bolt (12) at that point.

(B)

9. Press the POWER switch at the OFF side (14) to turn off the
power.

0771B

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 7. ADJUSTMENTS

7-36. Adjusting the upper shaft stop position

Adjust the stop position so that upper thread loops are maintained when the upper thread is trimmed.

0973B 1. While holding down the and keys (1), push the
POWER switch at the ON side (2).

0974B 2. Press the start switch (3).

0820B The motors will carry out home position detection, and then
the work clamp will be lowered to the ready position and the
sewing machine will switch to upper shaft stop position
adjustment mode.
* In upper shaft stop position adjustment mode, the offset
value (A) is displayed.

(A)

3. Press the start switch (3) again until the upper shaft begins
to move.
4. After the upper shaft stops, check that the arm reference line
<a> and the upper shaft pulley reference line <b> are
aligned.

[If they are not aligned]

Press the or key (4) to change the offset value (A),
and then repeat step 3.
* The setting range is -5 ° - +10° (in units of 1°).
[If they are aligned]
Continue to the next step.

5. Press the ENTER key (5).

The offset value will be stored.
NOTE:
If you continue to the next step without pressing the
ENTER key (5), the offset value will not be changed.
6. Press the TEST key (6).
Upper shaft stop position adjustment mode will end and the
sewing machine will return to home position standby.

0772B

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 7. ADJUSTMENTS

7-37. Installing (replacing) the sub clamp on the left side

If necessary, the sub clamp can be removed from the right side and can be installed on the left side instead. In this case, the
following optional parts are required.

To install the sub clamp on the left side, first have the following
option parts ready.
Ref. No. Code Qty. Part name
(34) SA7152001 1 Sub clamp wrist L
(9) (10) SA5683001 2 Air hose (outer dia. 4
mm, inner dia. 2.5 mm,
length 750 mm)
* Be sure to remove the stickers (A) before using the air
hoses (9) and (10).

1167B

(Top)

1168B

1. Stop the air and then bleed the air. (Refer to “3-16. Adjusting the air pressure” in the instruction manual.)
2. Remove the feed base unit (1) from the bed. (Refer to “5-3. Feed mechanism”.)
3. Disconnect the air tubes (2) and (3) from the joints (4) and (5).
4. Remove retaining ring C (6).
(Continued on next page)

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 7. ADJUSTMENTS

(Bottom)
(Viewed from above) 1169B

5. Remove the two screws (7), and then remove the sub clamp cylinder assembly (8).
6. Replace the air hoses (2) and (3) with the optional air hoses (9) and (10).
7. Remove retaining ring C (11) and pull out the shaft (12).
8. Insert the shaft (12) into the sub clamp S holder (13) in the direction shown in the illustration, and then install retaining ring C
(11).
9. Set the joint (14) and the cylinder rod (15) so that they are facing as shown in the illustration.

(Top) (Bottom)

1170B

10. Insert the shaft (16) of the sub clamp connecting rod into the hole in the feed base, and then install retaining ring C (6).
11. Tighten the two screws (7).

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(Top)
1171B

12. Route the tubes as shown in the illustration, and then connect the air hose (9) to the joint (4) and the air hose (10) to the joint
(5).
13. Secure the air hoses (9) and (10) in four places using the four bead bands (17) as shown in the illustration.

Work clamp plate R assembly

(Viewed from the underside)

1172B

14. Loosen the socket bolt (18), and then remove the sub clamp wrist (19).
15. Remove the spring (20).
16. Remove retaining ring C (21), and then remove the sub clamp arm (22).
17. Remove retaining ring C (23), loosen the two set screws (24), and then remove clamp support shaft J (25) in the direction of
the arrow.

(Continued on next page)

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 7. ADJUSTMENTS

18. Remove retaining ring C (26), loosen

Work clamp plate L assembly the two set screws (27), and then
remove the clamp support shaft (28)
in the direction of the arrow.

(Viewed from the underside)

1173B

Work clamp plate L assembly

(Viewed from the underside)

1174B

19. Insert clamp support shaft J (25) in the direction of the arrow, and then install retaining ring C (26).
20. Place the sub clamp arm (22) onto clamp support shaft J (25) as shown in the illustration, and then install retaining ring C (21).
21. Tighten the two set screws (27) so that the clearance between the clamp shaft holder (29) and clamp lever L (30) is 2.5 ± 0.5
mm.
* Check that the sides of work clamp L (31) and needle plate L (32) are aligned at this time. If they are not aligned, loosen
the socket bolt (33) and adjust.
22. Install the button clamp (35) to the optional sub clamp wrist L (34).
23. Install sub clamp wrist L (34) to the sub clamp arm (22), and then secure it by tightening the socket bolt (36).
(Refer to “7-26-4. Adjusting the position of the sub clamp”.)
24. Install the spring (20) to the sub clamp arm (22) and the clamp shaft holder (29).

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Work clamp plate R assembly

(Viewed from the underside)

1175B

25. Insert the clamp support shaft (28) in the direction of the arrow, and then install retaining ring C (23).
26. Tighten the two set screws (24) so that the clearance between the clamp shaft holder (37) and clamp lever R (38) is 2.5 ± 0.5
mm.
* Check that the sides of work clamp R (39) and needle plate R (40) are aligned at this time. If they are not aligned, loosen the
socket bolt (41) and adjust.

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 8. ELECTRICAL MECHANISM

8. ELECTRICAL MECHANISM
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet
before opening the cover of the control box. Touching areas where high voltages are present can result in severe
injury.

8-1. Precautions while carrying out adjustments

Be sure to note the following cautions when opening the control box to carry out inspections and adjustments.

Electric shocks
High voltages can remain in large-capacity capacitors for up to 5 minutes in some circumstances, even when the power has
been turned off. Accordingly, wait at least 5 minutes after turning off the power before carrying out the following operations.
• Opening and closing the control box
• Replacing fuses
• Inserting and disconnecting connectors
• Measuring resistance values
• Any other tasks that may involve touching components inside the control box

Some inspection items require the control box to be open when the power is turned on and voltages are measured.
At such times, be extremely careful never to touch anywhere other than the specified locations. In addition, note that high
voltages may remain for up to 5 minutes after the power is turned off.
Injury
Be careful not to touch metallic objects such as the heat sink and cover when connecting and disconnecting connectors and
making measurements.

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 8. ELECTRICAL MECHANISM

8-2. Inside the control box and operation panel structure

Main P.C. board
Secured to the side. This is the P.C. board that controls sewing machine operation.
PMD P.C. board
Secured to the base plate. This P.C. board drives the pulse motors and solenoids.
Power supply motor P.C. board
Secured to the rear. This P.C. board generates the voltages that are required for control, and drives the upper shaft motor.
There are 8 fuses on this P.C. board.
Filters (3 places)
The filters at the air intake slots in the cover and control box (2 places) should be cleaned about once a month.
Conversion transformer (Two types are used depending on the power supply voltage specifications.)
This breaks down the power supply voltage into the voltages that are required for control operations.
NF P.C. board
This eliminates the electrical interference that is generated by the power supply line.
Panel P.C. board
Secured to the inside of the operation panel. This P.C. board is used for displaying the sewing machine status and for input
operations.

Control box Operation panel

Filter NF P.C. board

Power supply
motor P.C. board Panel P.C. board

Main P.C. board

Filter
Conversion
transformer PMD P.C. board

1199B 0692B

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8-3. Description of fuses

When replacing the fuses, be sure to use the fuses specified below.
If the components on the P.C. boards are damaged, the fuses may blow again soon even after they have been replaced.
No. Part name Parts code Symptom when fuse blows
Fuse 15AFB Sewing machine motor does not operate and [E130] is
F1 SA3794-001
(Glass tube fuse 15A-250V) displayed.
Feed mechanism does not operate and [E201] or
Fuse 6AFB [E211] is displayed.
F2 SA3759-001
(Glass tube fuse 6A-250V) θ pulse motor does not operate and [E220] is
displayed.
Thread trimming solenoid or digital tension/tension
Fuse 6AFB
F3 SA3759-001 release solenoid does not operate, and thread
(Glass tube fuse 6A-250V)
trimming or thread tightening problems occur.
Fuse 3AFB Communication problem with PMD P.C. board and
F4 616167-001
(Glass tube fuse 3A-250V) [E403] is displayed.
Fuse 3AFB Power indicator does not illuminate and nothing
F5 616167-001
(Glass tube fuse 3A-250V) operates.
Fuse 3AFB DC fan motor does not operate and [E740] is
F6 616167-001
(Glass tube fuse 3A-250V) displayed.
F7 Fuse 15AFB Power indicator does not illuminate and nothing
SA3794-001
F8 (Glass tube fuse 15A-250V) operates.

Power supply motor P.C. board

4590Q

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8-4. Description of connectors

A large number of problems are often caused by connectors that are not inserted correctly or which are contacting poorly.
As a result, check that all connectors are inserted correctly and that the pins and wires are crimped properly before carrying
out problem diagnosis.

8-4-1. Connector positions

Main P.C. board

1200B
*1
This is a spare signal for special orders.

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PMD P.C. board

0693B

Power supply motor P.C. board

4593Q

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Panel P.C. board

0694B

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8-4-2. Symptoms when there are poor connections

This divides the functions of the connectors into five sections, but some connectors have more than one function, so be sure
to refer to the trouble symptoms in other sections too.
Feed mechanism
Trouble symptom Connector No. and position

• The feed mechanism operates briefly but does not detect

the home position correctly.
• [E200] or [E210] is displayed.

5241Q

• Problems with feed mechanism moving forward and back.

• [E210] or [E211] is displayed.

4708Q

• Problems with feed mechanism moving to the left and right.

• [E200] or [E201] is displayed.

4709Q

• Feed motor does not operate.

• [E200] is displayed.

4710Q

θ pulse motor mechanism

Trouble symptom Connector No. and position

• The θ pulse motor operates, but the home position is not

detected correctly.
• [E220] is displayed.

0755B

• The θ pulse motor does not operate.

• [E220] or [E221] is displayed.

0756B

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Thread trimming mechanism

Trouble symptom Connector No. and position

• Gimp solenoid and lower thread solenoid do not operate.

(No error displayed)

0757B

Sewing operations
Trouble symptom Connector No. and position

• Power indicator does not illuminate and sewing machine

does not operate.
• Operation is unstable.

5244Q

• [E403] is displayed when the power is turned on and the

sewing machine does not start.

4717Q

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Other
Trouble symptom Connector No. and position

• DC fan motor does not operate.

• [E740] is displayed.

0758B

• Operation panel display is incorrect.

• Power indicator does not illuminate.
• Operation panel keys do not work.
• Backlight does not illuminate.

0759B

• Sewing machine does not start when foot switch is

depressed.

[Treadle]
Work clamp drops when depressed to the 1st step
Sewing machine starts when depressed to the 2nd step

[2 pedal]
Work clamp drops when work clamp switch (left) is depressed
Sewing machine starts when start switch (right) is depressed

5247Q

• After the power is turned on, [E055] is displayed.

5248Q

• After the power is turned on, [E450] is displayed.

5249Q

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 8. ELECTRICAL MECHANISM

8-5. Troubleshooting
8-5-1. Troubleshooting procedure
Carry out troubleshooting by following the procedure given below.

With the power turned off, check that all connectors are securely inserted while
1 Checking connectors referring to “8-4. Description of connectors”.

Carry out diagnosis while following the steps in “8-5-2. Diagnosis flowchart” on the next
2 Diagnosis flowchart page, and if a problem # is reached, continue to the next procedure.

Refer to “8-5-3. Remedy” for the item that corresponds to the problem #. Carry out the
3 Remedy inspections for the problems in the order of the numbers in the “Cause” column.

NOTE:
When replacing the fuses, be sure to use a fuse with the same material and rating.

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8-5-2. Diagnosis flowchart

Description of symbols

Setting and status

Switch operation Continued on previous/next page

Judgment OFF Power switch OFF

“Problem” symbol in the “8-5-3. Remedy” lists

0760B

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0761B

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0762B

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8-5-3. Remedy
Problem #1 The power indicator does not illuminate when the power is turned on.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. Malfunction of voltage select a. Check if there is a broken wire in the voltage Voltage select harness ***
harness *** select harness. (*** indicates voltage
b. Disconnect the connector at the transformer specifications)
For 200V specifications side, turn on the power and then measure the
voltage at the cord.
(The wiring position may vary depending on
the voltage specifications.)
OK if same as wall outlet voltage
Voltage
Pin No.
specifications
100V 6-8
110V 5-8
120V 4-8
200V 3-8
220V 2-8
240V 2-7
H220V 3-6
380V 2-3
400V 1-3
4876Q

2. Malfunction of transformer • For 100V, 200V, 220V specifications Transformer

1) OK if there is continuity between pins
100V, 200V, 220V specifications 1-8, 2-8, 3-8, 4-8, 5-8 and 6-8 of the
8-pin connector coming out from the
transformer. [Fig. A]
2) OK if there is continuity between pins
1-2, 3-4 and 5-6 of the 6-pin connector
coming out from the transformer.
[Fig. C]
3) OK if there is continuity between pins
1-2 and 4-5 of the 5-pin connector
4877Q
coming out from the transformer.
[Fig. D]
380V, 400V specifications • For 380V, 400V specifications
1) OK if there is continuity between pins
1-3, 2-3, 3-4 and 3-6 of the 6-pin
connector coming out from the
transformer.
[Fig. B]
2) OK if there is continuity between pins
1-2, 3-4 and 5-6 of the 6-pin connector
coming out from the transformer.
4878Q
[Fig. C]
3) OK if there is continuity between pins
1-2 and 4-5 of the 5-pin connector
coming out from the transformer.
[Fig. D]

4879Q

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Problem #1 The power indicator does not illuminate when the power is turned on.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
3. Malfunction of power cord Disconnect connector P9 (ACIN) on the power
supply motor P.C. board from the circuit board,
turn on the power, and then measure the voltage
between pins 3-4 of the cord-side connector.
OK if same as wall outlet voltage

After inspecting, turn off the power and insert

connector P9.

4880Q

4. Blown fuse Remove fuses F7 and F8 and check the Glass tube fuse
continuity. 15A-250V
OK if continuity
(If there is no continuity, replace the fuse and
then carry out the inspections in 5. )
5. Malfunction of power supply Disconnect connector P17 (M-MOTOR) of the Power supply motor P.C.
motor P.C. board main P.C. board, turn on the power, and then board
measure the voltages between the pins at the
cord-side connector.

OK if the voltages are as shown in the table

below.
Pin Nos. Normal
+ side − side voltage
1 3 +5V
2 4 +5V
6 5 +24V
7 5 +24V

After measuring, turn off the power, wait 5

minutes or more and then insert P14.
5085Q

6. Malfunction of main P.C. board With connector P17 (M-MOTOR) inserted into Main P.C. board
the main P.C. board, turn on the power and then
measure the voltages between the pins at the
cord-side connector.

OK if the voltages are as shown in the table

below.
Pin Nos. Normal
+ side − side voltage
1 3 +5V
2 4 +5V
6 5 +24V
7 5 +24V

After measuring, turn off the power.

5085Q

7. Malfunction of panel P.C. board Check that connector P1 (PANEL) is inserted Panel P.C. board
into the main P.C. board, and that connector Panel harness
CN5 (MAIN) is inserted into the panel P.C.
board.

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Problem #2 When the power is turned on, an error code is displayed.

Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. If [E025] or [E035] is displayed, 1) Check if the foot switch is still depressed. Treadle unit
the foot switch is still depressed. 2) Check that the setting for memory switch No. 2-pedal foot switch
050 is correct while referring to “2-3. Memory
switch setting method (Advanced)”.
3) Check if there is a harness short-circuit.
4) Check that connector P6 (FOOT) is inserted
into the main P.C. board.
5) Check the switch input while referring to “2-6.
Input checking method”.
2. If [E055] is displayed, there is a 1) Check that the machine head safety switch is Machine head safety switch
malfunction of the machine head OFF.
safety switch. 2) Check that connector P9 (HEAD-SW) is
inserted into the main P.C. board.
3) Check if there is a harness short-circuit.
4) Check the machine head safety switch input
while referring to “2-6. Input checking
method”.
3. If [E065] is displayed, one of the 1) Check that connector P1 (PANEL) is Panel P.C. board
keys on the operation panel is inserted into the main P.C. board, and that Panel harness
still depressed. connector CN5 (MAIN) is inserted into the
panel P.C. board.
2) Check the key input while referring to “2-6.
Input checking method”.
4. If [E110] is displayed, there is a 1) Turn the upper shaft pulley to move the
malfunction of the needle up needle bar to the needle up stop position.
signal. 2) Check that connector P5 (SYNC) is
connected to the power supply motor P.C.
board and that the synchronizer is
connected.
3) Check the zigzag sensor and needle up
signal input while referring to “2-6. Input
checking method”.
5. If [E403] is displayed, there is a 1) Check that connector P1 (MAIN) is inserted Main P.C. board
poor connection between the into the PMD P.C. board. PMD P.C. board
main P.C. board and the PMD 2) Check if there is a harness short-circuit.
P.C. board.
6. If [E401] is displayed, there is a 1) Check that connector P17 (M-MOTOR) is Harness
poor connection between the inserted into the main P.C. board, and that Power supply motor P.C.
main P.C. board and the power connector P6 (MAIN) is inserted into the board
supply motor P.C. board. power supply motor P.C. board. Main P.C. board
2) Check if there is a harness short-circuit.
7. If [E450] is displayed, the 1) Check that connector P3 (HEAD-M) is Machine head memory
machine head memory cannot inserted into the power supply motor P.C.
be verified. board.
2) Check if there is a harness short-circuit.
8. If [E700] is displayed, there is 1) Check that the power supply voltage at the
an abnormal rise in the power wall outlet is within the range of the
supply voltage. specification voltage +/- 10%.
2) Refer to check items #1-2 and #1-3.
3) Check the power supply voltage while
referring to “2-6. Input checking method”.
9. If [E705] is displayed, there is 1) Check that the power supply voltage at the
an abnormal drop in the power wall outlet is within the range of the
supply voltage. specification voltage +/- 10%.
2) Refer to check items #1-2 and #1-3.
3) Check the power supply voltage while
referring to “2-6. Input checking method”.
10. If [E740] is displayed, there is a 1) Check if there are any thread scraps blocking Fan motor assembly
malfunction of the cooling fan. the cooling fan.
2) Check that connector P8 (SENSOR1) is
inserted into the main P.C. board.
3) Check the fan signal input while referring to
“2-6. Input checking method”.

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Problem #3 Feed base does not move at all when the start switch is depressed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. Malfunction of treadle unit With connector P6 (FOOT) inserted into the main Treadle unit
P.C. board, turn on the power and then measure
the voltages between pins 2-3 at the cord-side
connector. (No. 2 +, No. 3 −)

OK if the voltage is approximately 2 V at neutral

and approximately 4 V when the foot switch is
depressed as far as it will go.

5086Q

2. Malfunction of 2-pedal foot Disconnect connector P6 (FOOT) from the main Foot switch
switch P.C. board, and check the continuity between Foot switch cord assembly
Malfunction of hand start switch pins 5-6 and 7-8 at the cord-side connector. Hand start switch

OK if normally ∞ Ω, and 0 Ω when the foot switch

is depressed.

Work Start
clamp 1201B

Problem #4 Feed base home position is shifted.

Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Incorrect home position adjustment Switch to home position adjustment mode and
adjust the position of the feed base while
referring to “7-34. Adjusting the feed base X
home position and Y home position”.
Sewing machine specifications and Check that the settings for memory switch No.
memory switch settings do not 850 and No. 851 are correct while referring to
match. “ 2-3. Memory switch setting method (Advanced)”.
Malfunction of encoder Check the mechanisms for the X axis, Y axis and Pulse motor X assembly
θ axis home position sensors while referring to Pulse motor Y assembly
“2-6. Input checking method”. Pulse motor θ assembly

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Problem #5 When the start switch is depressed, an error code [E200] is displayed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. If the X feed does not operate Remove fuse F2 from the power supply motor Fuse
and [E200] is displayed, there is P.C. board and check the continuity. 6A-250V
a blown fuse. OK if continuity
(If there is no continuity, carry out the inspections
in 2.)
2. If the X feed does not operate 1) Disconnect connector P9 (POWER1) from PMD P.C. board or power
and [E200] is displayed, there is the PMD P.C. board and measure the supply motor P.C. board
a malfunction of the PMD P.C. resistance between pins 1-2 at connector P9.
board or of the power supply OK if ∞ Ω; if 0 Ω, there is a malfunction of the
motor P.C. board. PMD P.C. board.
2) Measure the resistance between the fuse F2
terminal that is close to P6 (MAIN) and pin 2
of connector P7 (PMD) on the power supply
motor P.C. board. (D10 check)
OK if ∞ Ω
3) Disconnect connector P9 (POWER1) from
the PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +100 V
After measuring, turn off the power, wait 5
minutes or more and then insert P9.
4) Disconnect connector P2 (POWER2) from
the PMD P.C. board, and then measure the
voltage between pins 1-2 of the cord-side
connector.
OK if approx. +16 V
After measuring, turn off the power, wait 5
minutes or more and then insert P2.
5) Check that connector P1 (MAIN) is inserted
into the PMD P.C. board.

4884Q
3. If the feed mechanism does not 1) Disconnect connector P10 (XPM) from the Pulse motor assembly
move and [E200] is displayed, PMD P.C. board, and measure the resistance
there is a malfunction of the between pins 1-2 and 3-4 at the cord-side
pulse motor or cord. connector.
OK if 2−3 Ω
After measuring, insert P10.
2) If 1) is OK, there is a malfunction of the PMD PMD P.C. board
P.C. board.

4885Q

4. If the X feed moves slightly and 1) Check that connector P20 (X-ENC) is Pulse motor X assembly
then [E200] is displayed, there inserted into the main P.C. board.
is a malfunction of the X axis 2) Check the X axis home position sensor (encoder)
home position sensor (encoder). input while referring to “ 2-6. Input checking
method”.

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Problem #6 When the start switch is depressed, an error code [E210] is displayed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. If the feed mechanism does not 1) Disconnect connector P8 (YPM) from the Pulse motor Y assembly
move and [E210] is displayed, PMD P.C. board, and measure the resistance
there is a malfunction of the between pins 1-2 and 3-4 at the cord-side
pulse motor or cord. connector.
OK if 2-3 Ω
After measuring, insert P8.
2) If 1) is OK, there is a malfunction of the PMD PMD P.C. board
P.C. board.

4886Q
2. If the Y feed moves and then 1) Check that connector P8 (SENSOR1) is Y axis home position sensor
[E210] is displayed, there is a inserted into the main P.C. board.
malfunction of the Y axis home 2) Check the Y axis home position sensor input
position sensor (proximity while referring to “2-6. Input checking
sensor). method”.
3) If a metallic object is brought close to the Y
axis home position sensor and the LED
inside the sensor does not illuminate, there is
a malfunction of the sensor.

Problem #7 When the start switch is depressed, an error code [E220] is displayed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. If the θ pulse motor does not 1) Disconnect connector P3 (PPM) from the Pulse motor P assembly
move and [E220] is displayed, PMD P.C. board, and measure the resistance
there is a malfunction of the between pins 1-2 and 3-4 at the cord-side
pulse motor or cord. connector.
OK if 2-3 Ω
After measuring, insert P3.
2) If 1) is OK, there is a malfunction of the PMD PMD P.C. board
P.C. board.

4888Q

2. If the θ pulse motor moves 1) Check that connector P5 (P-ENC) is inserted Pulse motor P assembly
slightly and then [E220] is into the main P.C. board.
displayed, there is a malfunction 2) Check the θ axis home position sensor
of the θ shaft home position (encoder) input while referring to “2-6. Input
sensor (encoder). checking method”.

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Problem #8 Work clamp is not lowered during sewing.

Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Malfunction of valve or valve harness 1) Check that connector P12 (AIR1) is Valve harness
inserted into the main P.C. board.
2) Check the air.

Problem #9 Hammer does not operate (When set to cutting before sewing).
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Malfunction of valve or valve harness Check that connector P25 (AIR2) is inserted Valve harness
into the main P.C. board.

Problem # 10 Sewing machine does not operate during sewing and [E120] is displayed.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. Malfunction of sewing machine Check connector P4 (UVW) of the power Motor cable
motor cord supply motor P.C. board and the sewing
machine motor connector.
2. If the fuse (F1) on the power supply 1) If the fuse (F1) is blown, check the Power supply motor P.C.
motor P.C. board is blown, there is resistance values between all pins of the board
a malfunction of the main P.C. connector P4 (UVW) and the pins of the
board. fuse (∞ Ω) and replace the fuse.
2) If the fuse blows again, replace the power
supply motor P.C. board.
3. Sewing machine motor overheats 1) Turn off the power and let the sewing Motor cable
and the thermostat inside the motor machine stand for 30 minutes or more.
operates when the sewing machine 2) Turn the power back on; OK if operation is
is operated at short cycle. normal.

Avoid repeated sewing of sewing data that is

less than 15 stitches.

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Problem #11 An error code is displayed after the sewing machine operates.
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. If [E120] (Needle drop signal 1) Check that connector P5 (SYNC) is inserted Motor assembly CCD-9820
error), [E130] (Upper shaft signal into the power supply motor P.C. board and
error) or [E131] (Upper shaft that the synchronizer is connected.
signal error) is displayed after 2) If the needle drop signal or upper shaft
the sewing machine operates, encoder signal can be confirmed to be
there is a malfunction of the turning on and off while referring to “2-6.
synchronizer, interference is Input checking method”, then they are OK.
causing operating problems, or 3) Turn the pulley by hand and check that it
the sewing machine is turns smoothly.
incorrectly adjusted. 4) Check that connector P17 (M_MOTOR) is
inserted into the main P.C. board and that
connector P6 (MAIN) is inserted into the
power supply motor P.C. board.
5) Check the harness between connector P17
(M_MOTOR) of the main P.C. board and
connector P6 (MAIN) of the power supply
motor P.C. board.
6) Check that the ground wire is connected to a
secure ground and that there is no equipment
nearby that is generating strong electrical
interference.
2. If [E150] is displayed after the 1) Turn off the power and let the sewing
sewing machine operates, the machine stand for 30 minutes or more.
motor is abnormally overheating. 2) Turn the power back on; OK if operation is
normal.

Problem #12 Upper thread trimming does not operate.

Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Malfunction of valve or valve harness Check that connector P12 (AIR1) is inserted Valve harness
into the main P.C. board.

Problem #13 Needle does not stop in the up position. ([E111] is displayed.)
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
1. Incorrect adjustment Adjust while referring to “7-36. Adjusting the
upper shaft stop position”.
2. Malfunction of needle up signal Check the needle up signal input while referring
to “2-6. Input checking method”.
3. Malfunction of zigzag sensor 1) Check that connector P10 (SENSOR2) is Main P.C. board
inserted into the main P.C. board.
2) Check the zigzag sensor while referring to
“2-6. Input checking method”.
4. Malfunction of cord Refer to inspection #10.
5. Malfunction of power supply With connector P2 (POWER2) connected to the Power supply motor P.C.
motor P.C. board PMD P.C. board, measure the voltage at the cord. board
OK if approximately 30 V DC between pins 3-4.

4892Q

6. Malfunction of main P.C. board Main P.C. board

7. Malfunction of motor Motor

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Problem #14 Lower thread trimming does not operate.

Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Malfunction of valve or valve harness Check that connector P12 (AIR1) is inserted Valve harness
into the main P.C. board.

Problem #15 Hammer does not operate (when set to cutting after sewing).
Cause Inspection/Remedy/Adjustment Replacement if a malfunction
Malfunction of valve or valve harness Check that connector P25 (AIR2) is inserted Valve harness
into the main P.C. board.

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9. ERROR CODES
DANGER
Wait at least 5 minutes after turning off the power switch and disconnecting the power cord from the wall outlet before
opening the cover of the control box. Touching areas where high voltages are present can result in severe injury.

If a problem should occur with the sewing machine, the buzzer will sound and an error code and error message will appear in
the display.
Follow the remedy procedure to eliminate the cause of the problem.

0320B
0461B

Switch-related errors
Code Cause Remedy Page
1
E010 Stop switch was pressed during standby. Remove your finger from the stop switch (so that it is off). *

Press the RESET key to clear the error.

E011 Stop switch was pressed during sewing. * Press the key to move the feed mechanism so that *1
you can continue sewing.
The stop switch was still being pressed, or
Turn off the power, and check the stop switch if it was not
E015 there is a problem with the stop switch -
being pressed at the time.
connection.
Turn off the power and check the connection of the stop
E016 Problem with the stop switch connection. 200
switch connector P13 at the main P.C. board.
1
E024 Start switch is being pressed. Release the start switch (so that it turns off). *
Start switch was depressed after the power Turn off the power and check if the start switch is pressed.
E025 was turned on, or connection of start switch is If the start switch is not being pressed, check the switch 200
defective. connector P6 at the main P.C. board.
1
E034 Work clamp switch is being pressed. Release the work clamp switch (so that it turns off). *
Work clamp switch was depressed, or 1
E035 Turn off the power and check the work clamp switch. *
connection of work clamp switch is defective.
Turn off the power, and then return the machine head to
Machine head tilting was detected after the its original position.
E050 200
power was turned on. Check the connection of the machine head safety switch
connector P9 at the main P.C. board.
Turn off the power, and then return the machine head to
Machine head tilting was detected while the its original position.
E051 200
sewing machine was operating. Check the connection of the machine head safety switch
connector P9 at the main P.C. board.
Turn off the power, and then return the machine head to
Machine head tilting was detected when the its original position.
E055 200
power was turned on. Check the connection of the machine head safety switch
connector P9 at the main P.C. board.
An operation panel key was still being pressed Turn off the power and check that no keys are being
E065 -
when the power was turned on, or key is faulty. pressed.
1
* ：Refer to the reference page in “10. ERROR CODES” in the instruction manual.

219 RH-9820

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 9. ERROR CODES

Upper shaft motor-related errors

Code Cause Remedy Page

Turn the upper shaft pulley until the point where the error
display disappears. 201
E110 Needle up stop position error If the error display does not disappear, turn off the power
and check the connection of the synchronizer connector 217
P5 at the power supply motor P.C. board.

Turn off the power, and check the connection of the 201
E111 Needle up stop position error
synchronizer connector P5 at the main P.C. board. 217

201
Turn off the power, and check the connection of the
E120 Needle drop signal could not be detected. 216
synchronizer connector P5 at the main P.C. board.
217

Turn off the power, and then turn the upper shaft pulley
and check if the sewing machine has locked up. 201
Sewing machine motor stopped due to a
E130 Check that the upper shaft motor connector P4 and
problem, or synchronizer is faulty. 217
synchronizer connector P5 are connected at the power
supply motor P.C. board.
Turn off the power, and check the connection of the 201
E131 Synchronizer is faulty. synchronizer connector P5 at the power supply motor P.C.
board. 217

Turn off the power, and then turn the upper shaft pulley
and check if the sewing machine has locked up.
Problem detected with sewing machine motor
E132 Check that the upper shaft motor connector P4 and 201
operation.
synchronizer connector P5 are connected at the power
supply motor P.C. board.
Turn off the power, and then turn the upper shaft pulley
and check if the sewing machine has locked up.
Sewing machine motor stopping position is
E133 Check that the upper shaft motor connector P4 and 201
incorrect.
synchronizer connector P5 are connected at the power
supply motor P.C. board.
Turn off the power, and then turn the upper shaft pulley
and check if the sewing machine has locked up.
Sewing machine motor operated in reverse
E140 Check that the upper shaft motor connector P4 and 201
during sewing.
synchronizer connector P5 are connected at the power
supply motor P.C. board.
Turn off the power, and then turn the upper shaft pulley
and check if the sewing machine has locked up.
Sewing machine motor is overheating, or
E150 Check that the upper shaft motor connector P4 and 201
temperature sensor is faulty.
synchronizer connector P5 are connected at the power
supply motor P.C. board.

RH-9820 220

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 9. ERROR CODES

Feed mechanism-related errors

Code Cause Remedy Page

X-feed motor home position cannot be Turn off the power, and then check that the X-feed motor 200
detected. connector P10 is connected at the PMD P.C. board and
E200 201
Problem with X-feed motor or poor X home that the X pulse motor encoder connector P20 is
position sensor connection. connected at the main P.C. board. 214

Turn off the power, and then check if there are any
E201 X-feed motor stopped due to a problem.
problems in the X-feed direction.
-

Y-feed motor home position cannot be Turn off the power, and then check that the Y-feed motor 200
detected. connector P8 is connected at the PMD P.C. board and that
E210 201
Problem with Y-feed motor or poor Y home the Y pulse motor encoder connector P4 and sensor
position sensor connection. connector P8 are connected at the main P.C. board. 215

Turn off the power, and then check if there are any
E211 Y-feed motor stopped due to a problem.
problems in the Y-feed direction.
-

θ-feed motor home position cannot be Turn off the power, and then check that the θ-feed motor 200
detected. connector P3 is connected at the PMD P.C. board and that
E220 201
Problem with θ-feed motor or poor θ home the θ-feed motor encoder connector P5 is connected at
position sensor connection. the main P.C. board. 215

Turn off the power, and then check if there are any
E221 θ-feed motor stopped due to a problem. -
problems in the θ-feed direction.

221 RH-9820

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 9. ERROR CODES

Communication and memory-related errors

Code Cause Remedy Page

Connection error detected between the main Turn off the power, and then check that connector P17 on 200
E401 P.C. board and power supply motor P.C. the main P.C. board and connector P6 on the power
board when the power was turned on. supply motor P.C. board are properly connected. 201

Communication error detected between the Turn off the power, and then check that connector P16 on 200
E403 main P.C. board and PMD P.C. board when the main P.C. board and connector P1 on the PMD P.C.
the power was turned on. board are properly connected. 201

Communication error between main P.C. Turn off the power, and then check that the operation 200
E410
board and panel P.C. board detected. panel connector P1 is connected at the main P.C. board. 201

Communication error between main P.C. Turn off the power, and then check that connector P17 on 200
E411 board and power supply motor P.C. board the main P.C. board and connector P6 on the power
detected. supply motor P.C. board are properly connected. 201

No CF card is inserted. Turn off the power, and then insert a CF card into the CF
E420
(No messages are displayed.) card slot of the control box.
-

E422 Error occurred while reading CF card. Check the data on the CF card. -

E424 Insufficient free space on CF card. Use a different CF card. -

E425 Error occurred while writing to CF card. Use the specified type of CF card. -

Problem with flash memory on main P.C.

E430
board.
Turn the power off and then back on again. -

E440 Problem with EEPROM on main P.C. board. Turn the power off and then back on again. -

Turn off the power, and check the connection of the

Model selection cannot be read from the
E450 machine head memory connector P3 at the power supply 212
machine head memory.
motor P.C. board.
Data cannot be backed up to machine head
E451
memory.
Turn the power off and then back on again. -

E480 Problem with RAM on main P.C. board. Turn the power off and then back on again. -

[P.C. board and connector positions]

Power supply P.C. board PMD P.C. board Main P.C. board

0535B

RH-9820 222

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 9. ERROR CODES

Software-related errors

Code Cause Remedy Page

Press the RESET key to clear the error.
* This error is displayed when a power supply motor
Program version error between main and
E569*2 P.C.board for a different model is installed. 198
motor detected.
Replace with the power supply motor P.C.B. for the
RH-9820 as soon as possible.
E580 Error in EEPROM version detected. Turn off the power and carry out level 3 initialization. *3
E581 Error in memory switch version detected. Turn off the power and carry out level 2 initialization. *3
E582 Error in parameter data version detected. Turn off the power and carry out level 1 initialization. *3
2
* ：If the version of the main control program (MN) is 1.0.00, this error (E569) will not be displayed.
3
* ：Refer to “7-3. Resetting the data (initialization)” in the instruction manual.

Device-related errors

Code Cause Remedy Page

Thread the upper thread, and then press the RESET key
to clear the error.
E600 Upper thread breakage occurred. *4
* Press the key to move the feed mechanism so that
you can continue sewing.
Upper thread breakage detector is not Turn off the power and check the connection of the stop
E601 200
connected. switch connector P13 at the main P.C. board.
Turn off the power, and then check that the valve harness
Lower thread trimmer does not operate,
E630 connector P12 and sensor connector P10 are inserted at 200
or lower thread trimming sensor is faulty.
the main P.C. board.
Turn off the power, and then check that the hammer valve
Hammer is lowered, or hammer position
E650 harness connector P25 and hammer position sensor 200
sensor is faulty.
connector P3 are inserted at the main P.C. board.
Turn off the power, and then check that the hammer valve
Hammer is not lowered, or hammer
E651 harness connector P25 and hammer position sensor 200
position sensor is faulty.
connector P3 are inserted at the main P.C. board.
*4：Refer to the reference page in “10. ERROR CODES” in the instruction manual.

P.C. board-related errors

Code Cause Remedy Page

E700 Abnormal rise in power supply voltage. Turn off the power and check the input voltage. 212

Abnormal rise in sewing machine motor

E701
drive voltage.
Turn off the power, and then check the voltage. -

E705 Abnormal drop in power supply voltage. Turn off the power and check the input voltage. 212

Abnormal current detected in sewing Turn off the power, and then check if there are any
E710
machine motor. problems with the sewing machine.
-

E719 Problem detected with PMD P.C. board. Turn off the power, and then check the PMD P.C. board. -
Turn off the power, and then check that the cooling fan
E740 Cooling fan does not operate. -
sensor connector P8 is connected at the main P.C. board.

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 9. ERROR CODES

Optional device-related errors

Code Cause Remedy Page

Sub-hammer is not set even though
Turn off the power, and then check that connector P12
straight buttonhole program is being
E940
sewn. (Straight buttonhole position
and connector P24 on the main P.C. board are properly *5
connected.
sensor is not responding.)
Sub-hammer is not retracted even though
Turn off the power, and then check that connector P12
eyelet buttonhole program is being sewn.
E941
(Eyelet buttonhole position sensor is not
and connector P24 on the main P.C. board are properly *5
connected.
responding.)
Sewing machine is trying to sew an eyelet
buttonhole while there is no material
under the straight buttonhole sensor.
E942 Press the RESET key. *5
Sewing machine is trying to sew a straight
buttonhole while there is material under
the straight buttonhole sensor.
No response from feed plate home Turn off the power, and then check that connector P23
E950 position sensor while feed plate is being and connector P25 on the main P.C. board are properly *5
driven. connected.
Turn off the power, and then check that connector P23
No response from feed plate left sensor
E951
while feed plate is being driven.
and connector P25 on the main P.C. board are properly *5
connected.
Turn off the power, and then check that connector P23
No response from feed plate right sensor
E952 and connector P25 on the main P.C. board are properly *5
while feed plate is being driven.
connected.
*5：Refer to the instruction manuals for the corresponding devices.

If an error code that is not listed above appears or if carrying out the specified remedy does not solve the problem, contact the
place of purchase.

RH-9820 224

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 10. TROUBLESHOOTING

10. TROUBLESHOOTING
• If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly
installed.
• Please check the following points before calling for repairs or service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.

CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
Otherwise the machine may operate if the start switch is pressed by mistake, which could result in serious injury.

Problem Cause Remedy Page

Thread breaks Adjust the thread tension to the correct Instruction
Thread tension is too strong.
tension. manual
Install the needle so that it faces Instruction
Needle is not installed correctly.
correctly. manual
Select a thread which is suitable for the Instruction
Thread is too thick for the needle.
needle. manual
Adjust the clearance between the
Needle and looper adjustment is 141, 148
needle and looper, the needle bar height
incorrect. 149
or the looper and spreader height.
Needle, looper, spreader, throat plate or
Repair or replace the respective part(s).
thread path is damaged.
Instruction
Thread is not threaded correctly. Thread the thread correctly.
manual
Skipped stitches occur. Upper thread tension is too strong or too Adjust the upper thread tension to the Instruction
weak. correct tension. manual
Needle point is broken or bent. Replace with a new needle.
Clearance between needle and looper Adjust the clearance between the
149
tip is incorrect. needle and looper tip.
Needle, looper and spreader adjustment 141
Adjust correctly.
is incorrect. 146 - 151
Needle and needle guard adjustment is
Adjust the needle guard. 149
incorrect.
Repair with an oilstone or replace the
Eye looper tip is blunt.
looper with a new one.

Install the needle so that it faces Instruction

Needle is not installed correctly.
correctly. manual

Select a needle that is suitable for the Instruction

Needle is too thin.
sewing conditions. manual

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 10. TROUBLESHOOTING

Problem Cause Remedy Page

Broken needle
Needle is bent. Replace with a new needle.

Needle, looper and spreader adjustment 141

Adjust correctly.
is incorrect. 146 – 151
Needle guard is covering the needle too
far.
Adjust the needle guard. 149

Select a needle that is suitable for the Instruction

Needle is too thin.
sewing conditions. manual
Upper thread is not cut. Replace the upper movable knife with a
Upper movable knife is blunt. 166, 167
new one.
Upper movable knife does not move to
Instruction
the full stroke because air pressure is Adjust the air pressure.
manual
too weak.
Install the upper movable knife so that it
Upper movable knife is not picking up
cuts only one side of the upper thread 167
the upper thread.
loop.
Upper movable knife is not picking up Refer to the remedies given under
the upper thread because the last stitch “Skipped stitches occur” in this 225
is being skipped. troubleshooting chart.
Upper movable knife position is Adjust the position of the upper movable
167
incorrect. knife.
Lower thread is not cut. Replace the movable knife with a new
Movable knife is blunt. 169, 174
one.
Movable knife does not move to the full Instruction
Adjust the air pressure.
stroke because air pressure is too weak. manual
Adjust the position of the movable knife 170, 173
Movable knife position is incorrect.
or the thread handler. 175
Cutting pressure for lower thread Adjust to an appropriate cutting
170, 174
trimming is too weak. pressure.
Thread unravelling at Adjust the lower thread nipper (-01
171, 173
sewing start Lower thread is not being held. specifications) or the lower thread
180
presser (-02 specifications).
Upper thread length is too short after Instruction
Adjust the sub tension.
trimming. manual
Not enough upper thread is being fed Adjust the amount of upper thread being
165
out. fed out.
Material is not being cut Adjust the cutting pressure so that it is
Cutting pressure is too weak. 160
cleanly. strong enough.
Knife and hammer are not contacting
Grind the hammer surface. 154
properly.
Knife is blunt. Replace the knife with a new one. 157
Poor thread tightening Upper thread tension is too strong or too Adjust the upper thread tension to the Instruction
weak. correct tension. manual

Lower thread tension is too strong or too Adjust the lower thread tension to the Instruction
weak. correct tension. manual
Tension or stroke of thread take-up Adjust the tension and stroke of the Instruction
spring is incorrect. thread take-up spring. manual

RH-9820 226

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 SERVICE MANUAL

Printed in Japan RH-9820

I6100920B
2007. 03. B (1)

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