INSTRUCTION MANUAL

BAS-341F
BAS-342F

Please read this manual before making using the machine.

Please keep this manual within easy reach for quick reference.

PROGRAMMABLE ELECTRONIC PATTERN SEWER

Thank you very much for buying a BROTHER sewing machine. Before using your new machine, please read the safety
instructions below and the explanations given in the instruction manual.

With industrial sewing machines, it is normal to carry out work while positioned directly in front of moving parts such as
the needle and thread take-up lever, and consequently there is always a danger of injury that can be caused by these
parts. Follow the instructions from training personnel and instructors regarding safe and correct operation before
operating the machine so that you will know how to use it correctly.

SAFETY INSTRUCTIONS
1 Safety indications and their meanings

This instruction 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 the
DANGER instructions will almost certainly result in death or severe injury.

The instructions which follow this term indicate situations where failure to follow the
C AU T I O N 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”.)

i BAS-341F, 342F
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 face plate 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
from sources of strong electrical noise such as range of 5 to 35 during use.
high-frequency welders. Temperatures which are lower or higher than this
Sources of strong electrical noise may cause
problems with correct operation. may cause problems with correct operation.
The relative humidity should be within the range of
Any fluctuations in the power supply voltage 45% to 85% during use, and no dew formation
should be within 10% of the rated voltage for should occur in any devices.
the machine. Excessively dry or humid environments and dew
Voltage fluctuations which are greater than this formation may cause problems with correct
may cause problems with correct operation. operation.
The power supply capacity should be greater than Avoid exposure to direct sunlight during use.
the requirements for the sewing machine’s Exposure to direct sunlight may cause problems
electrical consumption. with correct operation.
Insufficient power supply capacity may cause
problems with correct operation. In the event of an electrical storm, turn off the
power and disconnect the power cord from the
The pneumatic delivery capability should be wall outlet.
greater than the requirements for the sewing Lightning may cause problems with correct
machine's total air consumption. operation.
Insufficient pneumatic delivery capability may
cause problems with correct operation.

Installation
Machine installation should only be carried out by Install the belt cover and the frame side cover to
a qualified technician. the machine head and motor.
Contact your Brother dealer or a qualified electrician If using a work table which has casters, the
for any electrical work that may need to be done. casters should be secured in such a way so that
they cannot move.
The sewing machine weighs more than 200 kg.
The installation should be carried out by two or Be sure to wear protective goggles and gloves
more people. when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your
Do not connect the power cord until installation is skin, otherwise inflammation can result.
complete, otherwise the machine may operate if
the foot switch is depressed by mistake, which Furthermore, do not drink the oil or eat the grease
could result in injury. under any circumstances, as they can cause
vomiting and diarrhoea.
Hold the machine head with both hands by two or
more people when tilting it back or returning it to its Keep the oil out of the reach of children.
original position.
Furthermore, after tilting back the machine head,
do not push the face plate side or the pulley side
from above, as this could cause the machine head
to topple over, which may result in personal injury
or damage to the machine.
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.

BAS-341F, 342F ii
 CAUTION
Sewing
This sewing machine should only be used by If using a work table which has casters, the
operators who have received the necessary casters should be secured in such a way so that
training in safe use beforehand. they cannot 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 objects against the machine while sewing, as this
a needle breaks, parts of the broken needle may may result in personal injury or damage to the
enter your eyes and injury may result. machine.
Set the needle to the needle up stop position If an error occurs in machine operation, or if abnormal
before turning off the power. noises or smells are noticed, immediately turn off the
If this is not done, the wiper may strike the needle, power switch. Then contact your nearest Brother
which might cause the needle to break. dealer or a qualified technician.
Turn off the power switch at the following times, If the machine develops a problem, contact your
otherwise the machine may operate if the foot nearest Brother dealer or a qualified technician.
switch is depressed by mistake, which could result
in injury.
• When replacing bobbin
• When not using the machine and when leaving
the machine unattended

Cleaning
Turn off the power switch before carrying out Be sure to wear protective goggles and gloves
cleaning, otherwise the machine may operate if when handling the lubricating oil and grease, so
the foot switch is depressed by mistake, which that they do not get into your eyes or onto your
could result in injury. skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease
under any circumstances, as they can cause
vomiting and diarrhoea.
Keep the oil out of the reach of children.

Maintenance and inspection

Maintenance and inspection of the sewing If the power switch and air need to be left on when
machine should only be carried out by a qualified carrying out some adjustment, be extremely
technician. careful to observe all safety precautions.
Ask your Brother dealer or a qualified electrician to Hold the machine head with both hands by two or
carry out any maintenance and inspection of the more people when tilting it back or returning it to its
electrical system. original position.
Turn off the power switch and disconnect the Furthermore, after tilting back the machine head,
power cord from the wall outlet at the following do not push the face plate side or the pulley side
times, otherwise the machine may operate if the from above, as this could cause the machine head
foot switch is depressed by mistake, which could to topple over, which may result in personal injury
result in injury. or damage to the machine.
• When carrying out inspection, adjustment and
Use only the proper replacement parts as
maintenance
specified by Brother.
• When replacing consumable parts such as the
rotary hook If any safety devices have been removed, be
absolutely sure to re-install them to their original
Disconnect the air hoses from the air supply and
positions and check that they operate correctly
wait for the needle on the pressure gauge to drop
to “0” before carrying out inspection, adjustment before using the machine.
and repair of any parts which use the pneumatic Any problems in machine operation which result
equipment. from unauthorized modifications to the machine
will not be covered by the warranty.

iii BAS-341F, 342F

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

Safety devices
Eye guard
Finger guard
Thread take-up cover
Belt cover , etc.

3 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.

Thread take-up cover

Belt cover

Eye guard

Finger guard

1971S

BAS-341F, 342F iv
 CONTENTS
1. NAME OF MAJOR PARTS .................................................................................................................... 1
2. SPECIFICATIONS ........................................................................................................................................... 2

3. PREPARATION .................................................................................................................................................. 3
3-1. Before setting up .............................................................................................................................................................. 3
3-2. Positioning ......................................................................................................................................................................... 4
3-3. Tilting the sewing machine head .................................................................................................................................. 4
3-4. Connecting the ground wire ........................................................................................................................................... 5
3-5. V-belt tension ..................................................................................................................................................................... 5
3-6. Installing the foot switch ............................................................................................................................................... 5
3-7. Installing the spool stand ................................................................................................................................................ 6
3-8. Installing the programmer (option) ............................................................................................................................... 6
3-9. Adjusting the air pressure ............................................................................................................................................... 7

4. LUBRICATION ...................................................................................................................................................... 8
4-1. Lubrication points ............................................................................................................................................................. 8

5. CORRECT USE ................................................................................................................................................... 9

5-1. Selecting the needle and thread ...................................................................................................................9
5-2. Installing the needle and urnning the sewing machine..................................................................................9
5-3. Threading the upper thread ........................................................................................................................ 10
5-4. Winding the lower thread ............................................................................................................................ 11
5-5. Replacing the bobbin case and threading the thread ................................................................................. 12
5-6. Sewing conditions and thread tension ........................................................................................................ 12
5-6-1. Sewing conditions .................................................................................................................................................... 12
5-6-2. Lower thread tension ............................................................................................................................................... 13
5-6-3. Upper thread tension ............................................................................................................................................... 13
5-6-4. Thread take-up spring height ................................................................................................................................... 13
5-6-5. Thread take-up spring tension.................................................................................................................................. 13
5-6-6. Pretension tension .................................................................................................................................................... 14

6. USING THE OPERATION PANEL ................................................................................................ 15

6-1. Explanation of panel .................................................................................................................................................... 15
6-2. Using the floppy disk ................................................................................................................................................... 17
6-3. Using the program R/W (Read/Write) switch ............................................................................................................. 19
6-4. Using the TEST switch (Checking the sewing pattern) ............................................................................................. 20
6-5. Using the emergency stop switch ............................................................................................................................... 21
6-6. Adjusting the sewing SPEED control ....................................................................................................................... 22
6-7. Changing the X-SCALE and Y-SCALE settings ........................................................................................................ 22
6-8. Using the bobbin thread counter ................................................................................................................................ 23
6-9. Using production counter ............................................................................................................................................ 24
6-10. Using single split mode ............................................................................................................................................. 25
6-11. Shifting a stitch pattern .............................................................................................................................................. 26

BAS-341F, 342F
7. SEWING .................................................................................................................................................................... 27
7-1. Before starting sewing.................................................................................................................................................... 27
7-2. Sewing operation ............................................................................................................................................................ 27

8. MAINTENANCE AND INSPECTION ........................................................................................ 29

8-1. Cleaning the shuttle hook ............................................................................................................................................. 29
8-2. Lubrication ........................................................................................................................................................................ 29
8-3. Draining the oil ................................................................................................................................................................ 30
8-4. Cleaning the control box air inlet port ......................................................................................................................... 30
8-5. Cleaning the eye guard ................................................................................................................................................. 31
8-6. Checking the needle ...................................................................................................................................................... 31

9. STANDARD ADJUSTMENTS .......................................................................................................... 32

9-1. Adjusting the needle bar height .................................................................................................................................... 32
9-2. Adjusting the needle bar lift amount ........................................................................................................................... 32
9-3. Adjusting the needle clearance ................................................................................................................................... 33
9-4. Adjusting the driver needle guard ...............................................................................................................................33
9-5. Adjusting the shuttle race thread guide ..................................................................................................................... 33
9-6. Adjusting the movable knife ......................................................................................................................................... 34
9-7. Adjusting the presser foot .............................................................................................................................................. 36
9-8. Changing the presser foot lift ....................................................................................................................................... 37
9-9. Adjusting the wiper .......................................................................................................................................................... 38
9-10. Adjusting the needle up stop position ...................................................................................................................... 38
9-11. Checking the input sensor and DIP switch input ................................................................................................... 39
9-12. Checking the input voltage ......................................................................................................................................... 40
9-13. Clearing all memory settings ..................................................................................................................................... 40

10. DIP SWITCH ..................................................................................................................................................... 41

10-1. Panel DIP switch functions ........................................................................................................................................ 41
10-2. DIP switches inside the control box ......................................................................................................................... 43

11. CHANGING SPECIAL FUNCTIONS AND

USING THE MEMORY SWITCHES ........................................................................................ 45
12. ERROR CODES ........................................................................................................................................... 50

13. GAUGE PARTS LIST ACCORDING TO SUBCLASSES ............................... 52

14. NOTES ON THE PROCESSING AND PRODUCTION

OF PLATE BLANKS ................................................................................................................................. 53
15. TROUBLESHOOTING .......................................................................................................................... 54

16. OPTIONS .............................................................................................................................................................. 58

BAS-341F, 342F
1. NAME OF EACH PARTS

1. NAME OF EACH PARTS

■ BAS-341F

Cotton stand

Emergency stop switch

Operation panel

Thread wiper switch

Programmer

Power switch

Solenoid valve Control box

Integrater

Presser lifter pedal Starting pedal

1917S

■ BAS-342F

Presser foot
Work clamp

Feed plate

1918S

BAS-341F, 342F
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 2. SPECIFICATIONS

2. SPECIFICATIONS
Stitch formation Single needle lock stitch
Sewing machine Lock stitch, pattern tacking sewing machine (with large shuttle hook)
Maximum pattern size BAS-341F: 250X 150 mm, BAS-342F: 300 X 200 mm
Maximum stitch number 20,000 (one pattern)
Stitch length 0.1 - 12.7 mm
Maximum sewing speed 2,500 rpm (When stitch length is 3 mm or less)
Feed mechanism Intermittent feed, pulse motor drive
Shuttle hook Double hook (Standard hook is sold separately)
Needle DP X 5, DP X 17, MR
Data storage method 3.5 floppy disk 2HD/1.44MB, 2DD
Test function Operation test function provided for use with low speed drive

Automatic stop function for activation in the event of misoperation realized with intermediate
Safety devices
stop function and safety circuits

Work clamp height Max.30 mm

Work clamp Unit work clamp (special order-separate work clamp)
Work clamp lift stroke 18 mm
Intermittent stroke 0 or 3 (Factory default) - 8 mm

Machine head: 80kg,

Weights
Control box: 10 - 20 kg (depending on destination)

Power supply Single-phase 110V, 220V, 240V, 3-phase 220V, 380V, 400V, 900VA
Motor Three-phase 400 W induction motor
Air pressure 0.50 MPa 1.8 l/ min
Power table Use sitting or standing

BAS-341F 1,200W X 1,220D X 860H mm (Sitting)-1,130H mm (Standing)

Machine dimensions
BAS-342F 1,200W X 1,270D X 860H mm (Sitting)-1,130H mm (Standing)

BAS-341F, 342F
2
3. PREPARATION

3. PREPARATION
CAUTION
Machine installation should only be carried out by Install the belt cover and the frame side cover to
a qualified technician. the machine head and motor.
Contact your Brother dealer or a qualified If using a work table which has casters, the
electrician for any electrical work that may need to casters should be secured in such a way so that
be done. they cannot move.
The sewing machine head weighs more than 200 Be sure to wear protective goggles and gloves
kg. The installation should be carried out by two or when handling the lubricating oil and grease, so
more people. that they do not get into your eyes or onto your
skin, otherwise inflammation can result.
Do not connect the power cord until installation is
Furthermore, do not drink the oil or eat the grease
complete, otherwise the machine may operate if
under any circumstances, as they can cause
the foot switch is depressed by mistake, which
vomiting and diarrhoea.
could result in injury.
keep the oil out of the reach of children.
Be sure to connect the ground. If the ground
connection is not secure, you run the risk of
receiving a serious electric shock.
Hold the machine head with both hands by two or
more peple when tilting it back or returning it to its
original position. Furthermore, after tilting back the
machine head, do not push the face plate side or
the pulley side from above, as this could cause the
machine head to topple over, which may result in
personal injury or damage to the machine.

3-1. Before setting up

1. Install the Y driving shaft guard (1) to the rear of the
arm with the bolt (2) and the spring washer (3).

2. Install the guard (4) to the table rear cover (5) with the
bolt (6), spring washer (7), flat washer (8) and nut (9).

1919S

BAS-341F, 342F
3
 3. PREPARATION

3-2. Positioning
Decide the position for the sewing machine. Loosen nuts
of four level adjusters (1). Lower the level adjusters and
secure them with nuts (2).
Turning the level adjuster counterclockwise will raise its
height and turning it clockwise will lower it.

1920S

3-3. Tilting the sewing machine head

1921S 1. Remove screws (1) at the back of the work table, and
remove table cover (rear) (2).

2. Remove bolt (3).

The bolts are used to fix the machine in shipping.
Generally they are needless after removing them
keep them in another place.
Gas spring

3. Stand at the front of the table and slowly raise the

machine (4). Then lock it.
4. When returning the machine to its former position,
release lock (5). The gas spring will guide the machine
1922S to its original position.

BAS-341F, 342F
4
3. PREPARATION

3-4. Connecting the ground wire

CAUTION
Be sure to connect the ground. If the ground connection is not secure, you run the risk of receiving a serious
electric shock.

Connection method for 3-phase power supply.

Red 3-phase
White power supply
Black Yellow/Green
Yellow/Greeen Connect to
ground
0064Q

3-5. V-belt tension

These should approximately 10 - 12 mm of slack when V-
belt is loaded at 9.8 N . To adjust, loosen the two nuts (1),
and shift the motor up or down.

1923S

3-6. Installing the foot switch

Insert the connector of the foot switch (2) into the
connector (3) of the control box (1).

1924S

BAS-341F, 342F
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 3. PREPARATION

3-7. Installing the spool stand

Install the spool stand (1) to the table.

(1)

0073Q

3-8. Installing the programmer (option)

[Vertical] [Flat]

(1)
(1)
(2)
(1)
(2)
(2)

(4)
(3)
1181S 1182S 1183S

1. Install the programmer support (2) to the work table with the two screws (1).
2. Insert the programmer connector (4) securely into the left side of the operation panel (3).

BAS-341F, 342F
6
3. PREPARATION

3-9. Adjusting the air pressure

1. Air pressure should be 0.5 MPa.
The air pressure can be adjusted by pulling up and
turning the control knob (2) on the integrator (1).
After adjustment is complete, push the control knob
(2) downward to lock it.
2. If water stands in the bottle of the integrator (1), turn
the drain cock (3) in the direction indicated by an arrow
to drain the water.
Note
Open the air cock (4) slowly.

1925S

BAS-341F, 342F
7
 4. LUBRICATION

4. LUBRICATION
CAUTION
Turn off the power switch before starting lubricating, otherwise the machine may operate if the foot switch is
depressed by mistake, which could result in injury.

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
diarrhoea.
Keep the oil out of the reach of children.

Note
• Fill the machine with oil when the oil level is down to about one-third full in the oil sight glass.
If oil is not added and the oil drops below this level, there is the danger that the machine may seize during
operation.
• Be sure to let the machine operate for a while after adding the oil.
• Use only specified Brother oil (Nisseki Mitsubishi Sewing Lube 10N; VG10) for the machine oil.

4-1. Lubrication points

1926S 1927S

1. Fill the arm-side oil tank with oil. 2. Fill the bed-side oil tank with oil.
(Fill the oil tank with sewing machine oil.)

1928S 1929S

3. Add a drop of oil to the shuttle hook race. 4. If using the liquid cooling tank (1), fill it with silicon oil
(100 mm2/S).

BAS-341F, 342F
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5. CORRECT USE

5. CORRECT USE
5-1. Selecting the needle and thread
Needle Thread Main application
DP X 5 #9 #100 - #60 Knitted wear Different needles and threads are used for different sewing
applications.
DP X 5 #16 #80 - #50 General clothing
Refer to the table at left for details on which needle.
DP X 17NY #19 #50 - #20 Denim
DP X 17 #21 #50 - #20 Denim
DP X 17 #25 #50 - #20 Leather•seat belts

5-2. Installing the needle and running the sewing machine

CAUTION
Turn off the power switch before installing the needle, otherwise the machine may operate of the foot switch is
depressed by mistake and serious injury could result.

■ Installing the needle ■ To turn the pulley by hand

Turning
Down
Press

1930S 1931S

Loosen the set screw (1), insert the needle (2) as far as Simply press in on the pulley (1) to turn it by hand. To
it will go so that the groove is facing toward you and turn the pulley, press lever (2) down.
then tighten the set screw (1). • After turning the pulley by hand, be sure to press the
lever down to return the pulley to the normal
operating position.

BAS-341F, 342F
9
 5. CORRECT USE

5-3. Threading the upper thread

CAUTION
Turn off the power switch before threading the thread, otherwise the machine may operate of the foot switch is
depressed by mistake and serious injury could result.

1932S
[When using cotton thread and spun yarn]

[With synthetic thread] [Threading in the upper thread breakage detector]

Real the thread from above once or

twice as the above figure.
1933S 1934S

■ Thread the upper thread correctly as shown in the illustration above.

Note
• Turn the machine pulley and raise the thread take-up lever (1) before threading the upper thread.
(This will make threading easier and it will prevent the thread from coming out at the sewing start.)
• When threading the thread through the needle, allow a distance of approximately 40 mm between the needle hole
and the end of the thread. If the trailing length of the thread is too long, it may cause the thread to.

BAS-341F, 342F
10
5. CORRECT USE

5-4. Winding the lower thread

CAUTION
Do not touch or place anything against any of the moving parts while winding the lower thread, otherwise
personal injury or damage to the machine may result.

1. Place the bobbin all the way onto the shaft.

2. Thread the thread as shown in the illustration at left,
wind the thread around the bobbin several times in the
direction of the arrow, and then press the bobbin
presser (1).
3. Turn on the power switch.
(1)
(The POWER indicator on the operation panel will
illuminate.)

1198S

1199S 1935S
4. Check that the needle is not touching the presser foot,
and then while pressing the STEP BACK switch (2),
depress the foot switch (3) to start the machine. Keep
depressing the foot switch (3) until the lower thread
stops being wound onto the bobbin.
Release the STEP BACK switch (2) after the machine
starts operating.
(2)
If you release the foot switch before winding is com-
pleted, depress it once more while pressing and hold-
ing the STEP BACK switch (2).
5. The bobbin presser (1) will automatically return to its
(5) original position after a set amount of thread (80 - 90%
of the bobbin capacity) has been wound on.
6. Release the foot switch (3).
7. Remove the bobbin, hook the thread onto the knife (4),
and then pull the bobbin in the direction of the arrow to
(4) cut the thread.
(1) 8. To wind more thread onto the bobbin, loosen the set
0106Q 0107Q screw (5) and pull the bobbin presser (1) outward.

<< If the thread winds onto the bobbin unevenly >>

If the thread winds onto the bobbin unevenly, loosen
(2) the nut (1) and turn the bobbin winder thread tension
stud (2) to adjust.
A Note
If the thread winds on as shown in A, turn the bobbin
winder thread tension stud (2) clockwise; if it winds on
as shown in B, turn the bobbin winder thread tension
(1) stud (2) counterclockwise.
B

0108Q

BAS-341F, 342F
11
 5. CORRECT USE

5-5. Replacing the bobbin case and threading the thread

CAUTION
If the power switch needs to be left on when carrying out replacing the bobbin, be extremely careful to observe
all safety precautions.
The machine may operate if the foot switch is depressed by mistake, which could result in injury.
(ex. Continuing sewing from a stopping point)

(2)
(3) 30 mm
(4)

1936S 0110Q 1202S

1. Pull the shuttle race cover (1) forward and then open the cover.
2. Lift the bobbin case latch and remove the bobbin case.
3. Insert a new bobbin into the bobbin case, and then pass the thread through the slot (2) and pull it out from the thread
hole (3). Check that the bobbin turns in the direction of the arrow when the thread is pulled at this time.
4. Pass the thread through the lever thread hole (4), and then pull out approximately 30 mm of thread.

5-6. Sewing conditions and thread tension

5-6-1. Sewing conditions
Specifications For heavy materials For medium materials

Upper thread # 20 or equivalent # 50 or equivalent

Lower thread # 20 or equivalent # 60 or equivalent
Upper thread tension (N) 1.5 - 2.0 0.5 - 1.0
Lower thread tension (N) 0.2 - 0.4 0.2 - 0.4
Thread take-up spring height 8 - 10 mm 6 - 8 mm
Thread take-up spring tension(N) 1.5 - 2.0 0.4 - 0.6
Needle DP X 17 # 21 DP X 5 # 16
Normal sewing speed 2000 rpm 2000 rpm

The sewing conditions given in the above table may need to be changed depending on the article being sewn.

BAS-341F, 342F
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5. CORRECT USE

5-6-2. Lower thread tension 5-6-3. Upper thread tension

Weaker Stronger
Stronger
(1) Weaker

Stronger
Weaker

0112S 1937S

Set the lower thread tension to as weak a tension as Turn the tension nut (2) (main tension) to adjust the tension
possible and so that the bobbin case drops by its own as appropriate for the material being sewn.
weight when the end of the thread is held. Turn the Furthermore, turn the thread nut (3) (sub-tension) to adjust
adjusting screw (1) to adjust the tension. the remaining length of upper thread to 35 - 40 mm.
Note
If the lower thread tension is too weak, it may not be
possible to cut the lower thread properly during thread
trimming.

5-6-4. Thread take-up spring height 5-6-5. Thread take-up spring tension

Lower
Higher

Stronger

Weaker
1938S 1939S

Loosen screw (4) and turn the entire thread take-up unit to Adjust the thread take-up spring tension by turning the
adjust so that the height of the thread take-up spring is 8 - tension stud (5) with a screwdriver.
10 mm

BAS-341F, 342F
13
 5. CORRECT USE

5-6-6. Pretension tension

1940S

1. Raise the work clamp (1) and open the main tension disc (2).
The thread take-up spring (3) should not operate when the thread is pulled in the direction of the arrow.
2. Set the thread tension for the thread breakage detector pretension (4) to approx. 5 g.
Weaken the thread tension for the machine head pretension (5) as much as possible.

Standard for balance of thread tension

Adjust the thread tensions so that the total tension for the pretensions (4) and (5) is lower than the tension for the thread
take -up spring.
When the thread breakage detector is activated, set to ON DIP switch A – 8.
(Detection precision : DIP switch B – 5, Refer to “ DIP SWTCH “.)

Note
If misoperation of the thread breakage detector continues, repeat the adjustment procedure above.
(Such misoperation is most likely to occur when synthetic fiber yarns are used.)

BAS-341F, 342F
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6. USING THE OPERATION PANEL

6. USING THE OPERATION PANEL

6-1. Explanation of panel
(5) (1)

(7)
(2)
(8)
(9)
(3)
(10)

(11)

(4)

(6) 1207S

(1) POWER indicator........................When the power is turned on, the indicator lights to show that the power is on.
(2) PROGRAM No. display ..............Displays the program number 00 - 99.
(3) Program select switch.................Used to select the program number when reading a program from or writing a
program to disk.
(4) Program Read/Write switch .......Used to read a program from floppy disk, or to write a newly programmed stitch
pattern to floppy disk.
Up to ten patterns (00 - 99) can be stored on each disk.
(5) Display screen.............................Used to display data such as menus, errors and memory switch settings.
(6) Menu switch.................................Used to select the desired menu (scale, speed, bobbin thread counter, split No.).
One of the indicators (7) - (11) illuminates to indicate the menu selected, and the
setting for that menu them appears on the display screen (5).
The illuminated indicator changes in the following order each time the switch is
pressed.

X-SCALE indicator (7) Y-SCALE indicator (8) SPEED indicator (9)

B.T. COUNTER indicator (10) SPLIT NO. indicator (11)

(7) X-SCALE indicator .....................Illuminates when X-scale mode has been selected using the menu switch (6).
(8) Y-SCALE indicator ......................Illuminates when Y-scale mode has been selected using the menu switch (6).
(9) SPEED indicator .........................Illuminates when speed mode has been selected using the menu switch (6).

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 6. USING THE OPERATION PANEL

(5)

(13)

(14)

(10)

(11)

(6) (12) (16) (15) (17)

1208S

(10) Bobbin Thread COUNTER............Illuminates when bobbin thread counter mode has been selected using the menu
indicator switch (6).
(11) SPLIT NO. indicator........................Illuminates when split No. mode has been selected using the menu switch (6).

(12) Dial .................................................The setting shown on the display screen (5) can be changed by turning this dial
while pressing the STEP BACK switch (17).

(13) Bobbin Thread SET switch.................Used to store the number of work pieces displayed in the bobbin thread counter
to floppy disk.

(14) Bobbin Thread CHANGE ..............Used to continue sewing after replacing the bobbin thread.
switch (An alarm will sound when the counter reads <000>. Sewing is not possible when
the counter reads <000>.) (Refer to "6-8. Using the bobbin thread counter".)

(15) TEST switch ...................................Used to move the feed mechanism only in order to confirm a programmed stitch
pattern.

(16) TEST indicator................................Lights when the TEST switch is pressed.

(17) STEP BACK switch........................ Used when winding a fresh bobbin, or when correcting a stitch pattern due to a
(RESET switch) broken needle thread.
Also used to reset error displays.

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6. USING THE OPERATION PANEL

6-2. Using the floppy disk

<Compatible types of floppy disk>

No. of stitches Write

Data type Data resolution Disk Format
programmed enabled
20,000 stitches per
300E type pattern 100 pattern
0.05 mm/pulse Yes
(300F type) Up to a maxi-mum
of 360,000 stitches 2HD 1.44 MB
Tajima embroidery
50,000 stitches per pattern 0.1 mm/pulse No
data
4,000 stitches per
pattern 10 patterns
Old 300A type 0.1 mm/pulse Yes
Up to a maximum of
40,000 stitches Automatically
2DD
2,000 stitches per formatted
pattern 10 patterns
Old 300 data 0.2 mm/pulse No
Up to a maximum of
20,000 stitches

• The above four types of data can all be read, but when writing to disk, all data is automatically converted to 300F,
300E data when writing to 2HD disks and 300A data when writing to 2DD disks.
• When using a 2HD disk, use a disk which has been pre-formatted as a 1.44 MB disk. (The programmer can be used
to format these disks. Refer to the programmer instruction manual for details.)
• TFD embroidery data can be embroidered after it has been converted by the programmer to BAS-300F and BAS-
300E data.
• Restriction on using 2DD floppy disks.
In order to maintain compatibility with the old 300A series, the following restrictions have been placed on the use of
the new functions which have been added to the E series.

Applicable
Restricted function A series (2DD) F, E series (2HD)
command
Resolution 0.1 mm/pulse 0.05 mm/pulse
2 types 4 types (400, 600, 800and [668] L
Low-speed conversion
(400 and 1,200 revolutions) 1,200 revolutions) [669] L
Split function [220] L
Not available Available
during embroidering [230] L
[221] L
Needle down stop for split Not available Available
[231] L
Expansion option output Not available Available

BAS-341F,342F
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 6. USING THE OPERATION PANEL

Setting the floppy disk

(2)

(5)
(4)
Unlocked writing possible

(3) Window open

(1)
(6)

locked writing possible

1209S 1210S 1211S

1. Turn on the power switch (1). The POWER indicator (2) will illuminate and the machine model number will appear on
the display screen.
2. Hold the disk (3) with the label up and the shutter to the front, and insert the disk into the drive (4). It will click into
place.
3. To eject the disk, press the eject button (5).

Note
• Slide the write protector (6) on the back of the disk up (the window opens) to lock the disk and prevent accidental
erasure of the disk contents.
• Inserting the disk into the drive upside down or backwards may damage the drive and will prevent reading or
writing of data.
• Be sure to store your disks away from any magnets or magnetic sources, including radios, televisions, tele-
phones, and other devices. Magnetism can erase or damage disk contents. Also, be careful to prevent
exposure of the disk to oil or dust.
• Be sure to make a copy of the floppy disk containing sewing data and keep the master floppy disk.
• When the R / W operation is not in operation, eject the floppy disk from the floppy disk drive and keep it in a case
for floppy disk only to prevent exposure of the disk to dust.
When the “E.4F” error (Reading error of sewing data) occurs very often;
1. Clean the floppy disk drive using the cleaning disk.
2. Read the sewing data. If the “E.4F” error occurs again, the floppy disk may be damaged. In this case, clean the floppy
disk drive with the cleaning disk again.
3. Read the sewing data from the master floppy disk and write it in a new floppy disk. Do not use any damaged floppy
disks again.
How to use the cleaning disk
1. Insert the cleaning disk into the floppy disk drive.
2. Select a program number (0-9), and press the “R/W” switch. If you select the same program number for cleaning every
time, the same location of the cleaning disk is used and the lifetime of the cleaning disk will become short. Next time
you clean it, select a different number.
3. After the cleaning is completed, the “E.4F” error appears. The error appears because the cleaning disk has no data.
This is normal.
4. Cancel the error and eject the cleaning disk.

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6. USING THE OPERATION PANEL

6-3. Using the program R/W (Read/Write) switch

Programmed stitch patterns stored on floppy disk can be read into memory, and newly programmed patterns can be
written to disk for permanent storage and later recall.
1212S
Insert the floppy disk (1) containing or which is to contain
the programmed stitch pattern.
(7)
To READ a pattern to memory
Press the program select switch (3) on the operation
panel. The program number will then appear in the
(1)
PROGRAM NO. display (2). After selecting the desired
program number, press the R/W switch (4). The disk drive
(5) indicator (5) will illuminate and a "P" will appear on the
PROGRAM NO. display (2) to indicate that the data is
being read. When the alarm sounds and the disk drive
indicator (5) turns off, the program number will then flash
in the PROGRAM NO. display (2) instead of the "P" to
indicate that the reading of the data is complete.

To WRITE a pattern to disk

(2) Press the program select switch (3) on the operation
panel to select the desired program number. After
programming the pattern using the stitch programmer,
(3) press the R/W switch (4) The disk drive indicator (5) will
illuminate and a "P." will appear on the PROGRAM NO.
display (2) to indicate that the data is being written. When
the alarm sounds and the disk drive indicator (5) turns off,
the program number will then flash in the PROGRAM NO.
display (2) instead of the "P" to indicate that the writing of
(4) the data is complete.

1213S

1214S 1215S If an error message is displayed

If an error message code is displayed in the display (7),
and alarm will sound.
Press the emergency stop switch (6) on the front of the
(7) machine to stop sewing machine operation, and then
refer to and follow the error code list on page 63.

Clearing the error

(8)
1. Turn the EMERGENCY STOP switch (6) clockwise
and then pull it forward to release it.
2. Press the STEP BACK (RESET) switch (8) on the
operation panel
(when memory switch No. 0d is ON).
If memory switch No. 0d is OFF, press the
EMERGENCY STOP switch (7) once more to release
it.

1941S

BAS-341F,342F
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 6. USING THE OPERATION PANEL

6-4. Using the TEST switch (Checking the sewing pattern)

Use the TEST switch to begin sewing again from any desired point when the thread breaks or the bobbin thread runs out.
1217S 1215S
1. Press the TEST switch (15). The indicator (16) will
light.
2. If the work clamp is raised, depress the work clamp
lifter pedal (2) to lower the work clamp.
3. Press the starting pedal (1).
(16)
Note
After the feed mechanism has returned to the
home position, it will then move the sewing start
position and the program number will stop
flashing.
This only occurs the first time that a program is
(15) (17) selected.
4. Press the starting pedal (1). (The needle will remain
stationary as the work clamp advances through the
pattern at low speed one stitch at a time. Press the
presser lifter pedal (2) to fast forward.
• If the STEP BACK switch (17) is pressed while moving
at low speed when memory switch No. 20 is ON, the
work clamp will move in the forward direction in steps
of 100 stitches.
5. When the work clamp reaches the desired position,
press the TEST switch (15). The work clamp will stop,
and the test indicator (16) will go out. If the work clamp
was stopped too early, press theTEST switch (15)
again to proceed.
• If the work clamp was stopped too late, press the
STEP BACK switch (17) to advance the work clamp
one stitch at a time.

1942S Resuming operation from a stopping poing

6. Sewing will start when the starting pedal (1) is
pressed.

BAS-341F, 342F
20
6. USING THE OPERATION PANEL

6-5. Using the emergency stop switch

Press the emergency stop switch to immediately stop the sewing machine during actual sewing or when in the test
mode.
Clearing the error
1941S
1. Turn the EMERGENCY STOP switch (6) clockwise
and then pull it forward to release it .
2. Press the STEP BACK (RESET) switch (17) on the
operation panel. (The buzzer will stop sounding.)
3. If you do not wish to resume sewing, press the
EMERGENCY STOP switch (6) once more to release
it, and then press the STEP BACK (RESET) switch
(17) so that the operation panel display flashes. The
sewing machine will then be ready for the next sewing
operation.
* If memory sewing No. 0d is OFF, press the EMER-
GENCY STOP switch (6) once more to release it.

(17)
1215S

1219S 1215S
Continuing sewing from a stopping point
If you press the EMERGENCY STOP switch after the
thread breaks or the bobbin thread runs out during sewing,
you can then resume swing from the point where the
thread broke or ran out.
1. Press the EMERGENCY STOP switch to release it.
2. Press the STEP BACK (RESET) switch (17) to trim
the thread.
3. Press the STEP BACK (RESET) switch (17) once
more.
(15) (17) (The sewing machine will move stitch by stitch in the
reverse direction while this switch is pressed.)
If the sewing machine moves back too far, press the
TEST switch (15) to move it forward again. Press the
TEST switch (15) again to stop the machine.
(18) 4. After you have reached the desired position, depress
1200S the starting pedal to start sewing.

BAS-341F,342F
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 6. USING THE OPERATION PANEL

6-6. Adjusting the sewing SPEED control

The sewing speed can be changed in steps of 100 rpm to the appropriate speeds for each stitch length setting.
1. Press the MENU switch (6) until the SPEED indicator
(9) illuminates.
2. While pressing the STEP BACK switch (17), turn the
dial (12) until the desired speed is displayed.
• The display will change in steps of 10 rpm.

(9)

(17)

(6) (12)

1220S 1215S

6-7. Changing the X-SCALE and Y-SCALE settings

1. Press the MENU switch (6) until the X-SCALE
indicator (7) or the Y-SCALE indicator (8) illuminates.
2. While pressing the STEP BACK switch (17), turn the
dial (12) until the desired ratio flashes on the display.
• The scale setting is displayed as a percentage.
(7) 3. The program number will flash, and after the home
(8) position is detected the flashing will stop.

(17)

(6) (12)

1221S 1215S

BAS-341F, 342F
22
6. USING THE OPERATION PANEL

6-8. Using the bobbin thread counter

Set the bobbin thread counter to display the number of pieces of the selected pattern which can be sewn with the amount
of thread on the bobbin to avoid running out of bobbin thread in the middle of a patern.

(5)

(13)

(14)

(10)

(6) (12) (17)

1222S

1. Press the MENU switch (6) until the B.T. COUNTER indicator (10) illuminates.
• The bobbin thread counter can be set to any number from <001> to <999>. If the counter is set to <000>, sewing
continues irrespective of the amount of bobbin thread remaining.

2. While pressing the STEP BACK switch (17), turn the dial (12) to set the number of articles to be embroidered.

3. Insert the floppy disk and press the bobbin thread SET switch (13). An alarm will beep twice. This will record the
number of work pieces shown in the counter (5) to the disk.

4. The number shown in the counter (5) will decrease one each time the stitch pattern is completed. When the number of
patterns shown in the counter is sewn, the counter (5) will red <000>, and an alarm will sound. (The sewing machine
will not start even if the start switch is pressed.)

5. Press the bobbin thread change switch (14) and replace the bobbin. The alarm will stop, and the number of work
pieces set in step 3 will be displayed again in the counter (5).

BAS-341F,342F
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 6. USING THE OPERATION PANEL

6-9. Using production counter

Both PRO. NO. and B.T. COUNTER displays are available for the five-digit PRODUCTION counter.

(5)

(13)
(2)
(14)

(10)
(11)

(6) (12) (16) (15) (17) 1223S

1. While pressing the TEST switch (15), press the B.T. SET switch (13) The B.T. COUNTER indicator (10) and the SPLIT
NO. indicator (11) will both illuminate, and the production counter value will appear on the program number display (2)
and on the display screen (5).
• Press the B.T. CHANGE switch (14). The PRODUCTION counter will display <00000>.
• The production counter can be set to a value between <00000> and <99999> by turning the dial (12) while
pressing the STEP BACK switch (17).

2. Depress the start switch to start embroidering.

3. Press the TEST switch (15) or the MENU switch (6). The TEST indicator (16) will switch off and the contents of each
display screen will return to the normal display.

BAS-341F, 342F
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6. USING THE OPERATION PANEL

6-10.Using single split mode

By using single split mode, it is possible to change up to 100 patterns immediately.

(5)

(17)

(6) (12)

1224S 1225S
1215S

1. Move DIP switch B No. 1 to the ON position. This will activate single split mode.
(Refer to "10.DIP SWITCH".)

2. Turn on the power read in the patterns which have been programmed for split sewing.

3. Press the MENU switch (6) until the SPLIT NO. indicator (11) is illuminated. "1" will then appear in the display screen
(5). Then, while pressing the STEP BACK switch (17), turn the dial (12) to change the contents appearing on the
display screen (5) in order.
(Example) If three patterns have been programmed for split sewing, the number on the display screen changes in
the following order: "1" “2" "3" "1" "2" ...

4. When the starting switch is pressed, only the pattern displayed on the display screen (5) will be sewn.

Note
As to split sewing, refer to the instruction manual of the “electronic programmable pattern tacker programmer”.

BAS-341F,342F
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 6. USING THE OPERATION PANEL

6-11. Shifting a stitch pattern

• Programs which have already been programmed can be moved up, down and to the left and right.
(However, such patterns will be reset if the power supply is turned off or the program number is changed.)
• The feed position can be set to the any position desired.

(5)

(7)
(2)
(8)

(10)

(4)

(6) (12) (16) (15)

1226S 1943S

1. After the program data has been read, depress the start switch to move the feed mechanism to the sewing start
position. If you carry out the following procedure while the program number display (2) is flashing (if the start switch
has not been depressed) (The feed position can be set to any position, but it will not be possible to move the
stitch pattern.

2. Press the MENU switch (6) until the B.T. COUNTER indicator (10) illuminates.

3. Press and hold the TEST switch (15) and press the R/W switch (4). The test indicator (16) will light, and < > will
appear in the counter (5).

4. Press the MENU switch (6) so that either the X-SCALE indicator (7) or Y-SCALE indicator (8) illuminates.

5. Turn the setting dial (12) to move the feed mechanism one pulse at a time.
• If the setting dial is turned counterclockwise while the X-SCALE indicator is illuminated, the feed mechanism will
move to the right.
• If the setting dial is turned clockwise while the X-SCALE indicator is illuminated, the feed mechanism will move to
the left.
• If the setting dial is turned counterclockwise while the Y-SCALE indicator is illuminated, the feed mechanism will
move up.
• If the setting dial is turned clockwise while the Y-SCALE indicator is illuminated, the feed mechanism will move
down.

6. When the TEST switch (15) is pressed after the above fine adjustments have been made, the TEST indicator (16) and
display window (5) will both switch off and movement of the stitch pattern will be completed.

Note
When moving the stitch pattern, the sewing start position can be moved to any desired point within the sewing area,
but if the pattern goes outside the sewing area, an error will occur during sewing and you will not be able to sew the
pattern. Give consideration to the pattern as a whole when moving it.

BAS-341F, 342F
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7. SEWING

7. SEWING
CAUTION
Turn off the power switch at the following times, otherwise the machine may operate if the foot switch is
depressed by mistake, which could result in injury.
• When replacing the bobbin and needle
• When not using the machine and when leaving the machine unattended
Do not touch any of the moving parts or press any objects against the machine while sewing, as this may result
in personal injury or damage to be machine.

7-1. Before starting sewing....

• Check that the needle bar is at the highest position.
Turn the machine pulley so that the index mark (1) on
the pulley is almost aligned with the point where belt
cover U and belt cover D meet.

* If the machine is started while the index mark (1) is not

correctly aligned, error message "E-22" will be
displayed (only when memory switch No.14 is on).

1944S

7-2. Sewing operation

1. Turn the power switch on.
(The power indicator on the operation panel will light.)
2. Insert the floppy disk (3).
3. Press the PRO. No. selection switch (4) to select the
desired program number.
4. Press R/W switch (5).
The floppy disk drive indicator will light and the
(6) PROGRAM NO. display (6) will show a “P” while
(3) the data is being read. When reading is completed,
(4) an alarm will sound and the indicator will go out,
then the PROGRAM NO. display (6) will blink the
program number.

(5)

1229S 1213S

BAS-341F,342F
27
7. SEWING

5. Step on the presser lifter switch (2) to raise the presser

foot.
6. Insert the work piece under the work clamp, and press
the presser lifter switch (2) to lower the clamp.
7. Press the starting pedal (1).
Note
The work clamp will return to the origin, and will
then advance to the sewing start position and
blinking will stop. This is only required the first
time a program is sewing.
8. Press the starting pedal (1) again to start sewing.
After sewing is completed, the thread cutter will
automatically operate, then the work clamp will rise.

1942S

Note
When the power is turned on after once being turned off, the same pattern of sewing can be continued since the
machine will stores the sewing data from the last time.

BAS-341F, 342F
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8. MAINTENANCE AND INSPECTION

8. MAINTENANCE AND INSPECTION

CAUTION
Turn off the power switch before starting any cleaning work, otherwise the machine may operate if the foot
switch is depressed by mistake, which could result in injury.

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
diarrhoea. Keep the oil out of the reach of children.

8-1. Cleaning the shuttle hook

(5)

1936S 1945S 1946S

1. Pull the shuttle hook cover (1) 2. Open the large shuttle hook set 3. Clean all the dust and thread ends
forward to open, and then remove claw (2) in the direction indicated from around the driver (5), the top
the bobbin case. by the arrow, and then remove the of the shuttle hook thread guide
large shuttle hook (3) and the inner and the shuttle race.
shuttle hook (4).

8-2. Lubrication
Note
• Fill the machine with oil when the oil level is down to about one-third full in the oil sight glass.
• If oil is not added and the oil drops below this level, there is the danger that the machine may seize during
operation.
• Be sure to let the machine operate for a while after adding the oil.
• Use only specified Brother oil (Nisseki Mitsubishi Sewing Lube 10N; VG10) for the machine oil.

1926S 1927S

1. Fill the arm-side oil tank with oil. 2. Fill the bed-side oil tank with oil.

BAS-341F,342F
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 8. MAINTENANCE AND INSPECTION

3. If using the liquid cooling tank (1), fill it with silicon oil
(100 mm²/S).

1929S

8-3. Draining the oil

1. Remove and empty the waste oil container (1)
whenever it is full.
2. After emptying the waste oil container (1), screw it
back into its original position.

1947S

8-4. Cleaning the control box air inlet port

Use vacuum cleaner to clean the filter in the air inlet port
(2) of the control box (1) at least once a month.
* If the machine is used while the air inlet port is blocked,
the inside of the control box will overheat.
When this happens, the overheating error code (“E-d”)
will be displayed and you will not be able to operate
the sewing machine.

1948S

BAS-341F,342F
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8. MAINTENANCE AND INSPECTION

8-5. Cleaning the eye guard

Wipe the eye guard clean with a soft cloth.
Note
Do not use solvents such as kerosene thinner to clean
the eye guard.

1235S

8-6. Checking the needle

Always check that the tip of the needle is not broken
before starting sewing.

1236S

BAS-341F,342F
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 9. STANDARD ADJUSTMENTS

9. STANDARD ADJUSTMENTS
CAUTION
Maintenance and inspection of the sewing Hold the machine head with both hands when
machine should only be carried out by a qualified tilting it back or returning it to its original position.
technician. Furthermore, after tilting back the machine head,
do not push the face plate side or the pulley side
Ask your Brother dealer or a qualified electrician to
from above, as this could cause the machine head
carry out any maintenance and inspection of the
to topple over, which may result in personal injury
electrical system.
or damage to the machine.
Turn off the power switch and disconnect the
If the power switch needs to be left on when
power cord from the wall outlet at the following
carrying out some adjustment, be extremely
times, otherwise the machine may operate if the
careful to observe all safety precautions.
foot switch is depressed by mistake, which could
result in injury. If any safety devices have been removed, be
• When carrying out inspection, adjustment and absolutely sure to re-install them to their original
maintenance positions and check that they operate correctly
• When replacing consumable parts such as the before using the machine.
rotary hook and knife

9-1. Adjusting the needle bar height

(1)

a A

1237S 1949S

Turn the machine pulley to move the needle bar to the lowest position. Then remove the rubber plug, loosen the screw
(2) and then move the needle bar up or down to adjust so that the second reference line from the bottom of the needle
(reference line A) is aligned with the lower edge of the needle bar bush (1).
* If using a DP X 5 needle, use the highest reference line (reference line a).

9-2. Adjusting the needle bar lift amount

a A(1)

b B

1239S 1950S

Turn the machine pulley to raise the needle bar from the lowest position until the lowest reference line on the needle
(reference line B) is aligned with the lower edge of the needle bar bush (1). Then loosen the screw (2) and move the
driver (3) to adjust so that the tip of the shuttle hook is aligned with the needle center line.
* If using a DP X 5 needle, use the second reference line from the top of the needle (reference line b).

BAS-341F, 342F
32
9. STANDARD ADJUSTMENTS

9-3. Adjusting the needle clearance

0.01 - 0.08 mm

0138Q 1951S

Turn the machine pulley to align the tip of the shuttle hook with the needle center line. Then loosen the set screw (1)
and turn the eccentric shaft (2) to adjust so that the clearance between the needle and the shuttle hook is 0.01 - 0.08 mm.

9-4. Adjusting the driver needle guard

Needle center line

Tip

(1)

0135Q 1242S 1952S

Turn the machine pulley to align the tip of the shuttle hook with the needle center line. Then loosen the set screw (2)
and turn the eccentric shaft (3) to adjust so that the driver needle guard (1) contacts the needle. If the needle contact
pressure is too great, skipped stitches may occur. On the other hand, if the driver needle guard (1) is not touching the
needle, the tip of the inner shuttle hook will obstruct the needle, resulting in an excessively high amount of friction.

9-5. Adjusting the shuttle race thread guide

1953S

The needle groove of the shuttle race thread guide (1) should be aligned with the center of the needle plate hole, and the
needle center and section A should be aligned.
Note
If the shuttle race thread guide is in the wrong position, thread breakages, soiled thread or catching of the thread may occur.

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 9. STANDARD ADJUSTMENTS

9-6. Adjusting the movable knife

1954S 1955S

Loosen the nut (2) and move thread trimmer rod L (3) to the left or right to adjust so that the V section A of the movable
knife (1) is aligned with the index mark B on the needle plate when the machine is at the stop position.

■ Replacing the movable and fixed knives

1956S

1957S

1. Remove the screws (1) and the feed plate (2). Then tear off the auxiliary plate sheet (3). Remove screws (4) and (5),
and needle plate (6). Now disconnect the thread cutter connecting rod (7) from stud (8). (Figure is BAS-342F.)

BAS-341F, 342F
34
9. STANDARD ADJUSTMENTS

1958S

2. Remove the movable knife, and replace it with a new movable knife. Now check the cutting edge of the movable
knife (9) and the fixed knife (10). If necessary, use the provided movable knife washer (11) (T=0.4, T=0.5, T=0.6) to
adjust the knives so that they cut properly. (Figure is BAS-342F.)

<Adjusting the engagement of the movable knife and fixed knife>

1247S 0149S
Fig. 1
Movable knife
A B C D
Cutting (9)
edge
Fixed knife
Cutting edge
Cutting edge

Cutting edge

0148Q 0150Q

A. After the movable knife and fixed knife are properly engaged, tighten the screw as shown in Fig.1.
B. Turn the movable knife (in the direction of the arrow) while the screw is still tightened.
C. Loosen the screw.
D. Turn the movable knife (in the direction of the arrow) while the screw is still loosened.
Repeat above steps A, B, C and D four or five times to maintain the cutting performance of the knife.

3. Install the fixed knife (10) 0.5 mm away from needle

hole plate (12).

1959S

BAS-341F, 342F
35
 9. STANDARD ADJUSTMENTS

1960S

4. Fit the thread cutter connecting rod (7) on connecting lever pin (8), and install needle plate (6).(Figure is BAS-342F.)
* When fitting the connecting rod (7) on the connecting lever pin (8) and before tightening screws (4) and (5), move the
needle plate back and forth a little bit to confirm that the movable knife (9) is pulled by the connecting rod (7).

5. Stick the auxiliary plate sheet (3).

When sticking, adjust the edge of auxiliary plate sheet
to the ridgeline in the rear chamfering of needle sub
panel (12).
* One month is a standard to replace the sheet.

Chamfering

1961S

9-7. Presser foot adjustment

Turn the pulley by hand to lower the presser foot to the down position, and then proceed with the steps below.

1962S
1. Loosen screw (1), set the bottom of the presser foot
(2) lightly against the work piece, and then tighten
screw (1).
Note
If the presser foot is lowered too far, the work piece will
shift when sewing. Also, if the presser foot is too high,
skipped stitches may occur.
2. Turn the pulley by hand, and make sure the needle
enters the center of the needle hole in the presser foot
(2). If the needle is not aligned with the center of the
needle hole, remove cap (3), loosen screw (4), and
turn the presser foot (presser bar) to adjust.
If the needle projects past the presser foot
when the presser foot is raised, injury may
Turning result.
Down
Press ■ To turn the pulley by hand
Simply press in on the pulley (1) to turn it by hand. To
turn the pulley, press lever (2) down.
• After turning the pulley by hand, be sure to press
the lever down to return the pulley to the normal
operating position.

1931S

BAS-341F, 342F
36
9. STANDARD ADJUSTMENTS

9-8. Changing the presser foot lift

<Standard presser foot lift is 3 mm (max. 8 mm). >

(9)

3 - 5 mm
(8)

(6)

0.5 - 1 mm
(7)
1252S 1963S 1254S

Adjusting presser foot lift to 3 - 5mm

1. Loosen the screw (2) and open the intermittent cover (3).
2. Loosen the nut (4) and adjust the intermittent presser connecting rod (5) position.
(When the intermittent presser connecting rod is raised, the lift will increase. When lowered, the lift will decrese.)

Adjusting presser foot lift to 5 - 8 mm

1. Turn the upper shaft to set the presser foot to its lowest point. Loosen the screw (9) of intermittent presser arm (R) (8).
Adjust the clearance between the presser lifter (6) and the presser bar bush (7) to 0.5 - 1 mm.
2. Loosen the nut (4) and adjust the intermittent presser connecting rod (5) position.
(When the intermittent presser connecting rod is raised, the lift will increase. When lowered, the lift will decrese.)
3. Loosen the presser foot screw and adjust the height of the presser foot so that it is 0.5mm above the top of the
material being sewn when the presser foot is lowered.

1964S

If vertical movement of the presser foot is not required

1. Remove the face plate (10).
2. Remove the stud screw (11) and re-attach the intermitte connecting rod (12) to the upper screw hole (14) of the
intermittent presser arm F (13).

BAS-341F, 342F
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 9. STANDARD ADJUSTMENTS

9-9. Adjusting the wiper

(4)
(3)
(1)
(2)
(2) (5)
(6)

approx. approx. 2 mm
112 mm
1257S 15 mm 1258S 1259S

1. When the thread wiper solenoid plunger (1) is driven to the full stroke, the wiper (2) should be 15 mm in front of the
needle center. Loosen screws (3) and shift the entire solenoid bracket (4)up or down to adjust.
The standard height from the solenoid bracket (4) bottom to the needle plate top is approximately 112 mm.
2. When the wiper (2) is operated and aligned with the center of the needle bar, the distance from the wiper (2) to needle
tip should be approximately 2 mm. Loosen screw (5) and move the wiper (2) in or out to adjust. As shown in Fig. A,
make sure the wiper (2) does not strike the presser foot (6) or needle.
Note
Check that the wiper (2) is not touching the finger guard.

9-10. Adjusting the needle up stop position

• The needle up stop position has been adjusted so that
the tip of the needle stops 17.5 – 19.5 mm above the
top of the needle plate.
• If adjustment is necessary, loosen the screw (2) at the
"U" mark of the machine pulley (1) and adjust the
position of the machine pulley (1). The machine pulley
(1) stops later if it is turned clockwise, and it stops
earlier if it is turned counterclockwise.

Note
• The screw (3) is used by the needle down
detection function and should not be loosened.
• The screw (4) is a screw for detecting the machine
top position, and should not be loosened.
• If the index mark is not inside the mark when be
displayed (when memory switch No.14 is on). Turn
the machine pulley to move the index mark to the
correct position and then start the sewing machine.

1965S

BAS-341F, 342F
38
9. STANDARD ADJUSTMENTS

9-11. Checking the input sensor and DIP switch input

(5)

(7) (4)

(1)

(3)

(6) (2)
1273S 1274S

1. When the SPLIT NO. indicator (1) is illuminated and the R/W switch (3) is pressed while the TEST switch (2) is being
pressed, the X-SCALE indicator (4) will illuminate and the state of the X home position signal will appear on the display
screen (5).
When sensor is ON When sensor is OFF

1282S 1283S

2. Each time the MENU switch (6) is pressed, a different indicator will illuminate and the operating condition for the
corresponding item will appear on the display screen.
• When X-SCALE indicator is illuminated : X home position sensor
• When Y-SCALE indicator is illuminated : Y home position sensor
• When SPEED indicator is illuminated : Needle up signal (synchronizer)
• When B.T. COUNTER indicator is illuminated : 24-section signal (synchronizer)
• When SPLIT ON. indicator is illuminated : Needle down signal (synchronizer)

3. If the settings for DIP switch A at the side of the operation panel are changed at this time, the number of the changed
switch will appear in the top row of the program number display (7).

1284S

4. If the settings for DIP switch B are changed at this time, the number of the changed switch will appear in the bottom
row of the program number display (7).

1285S

5. Press the TEST switch (2). The display will return to normal.
Note
You need to move the DIP switch while the power is still turned on in order to check the DIP switch operation.
However, the power must always be turned off before DIP switch settings can be changed.

BAS-341F, 342F
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 9. STANDARD ADJUSTMENTS

9-12. Checking the input voltage

1. Turn on the power switch.
2. Press the menu switch (1) until the X-SCALE indicator (2) illuminates.

(1)
(2) 1276S
1275S

3. While pressing the TEST switch (3), press the R/W switch (4)

(3)
(4)

1278S
1277S

4. If the input voltage is normal, the input voltage conditions will be shown in the display as indicated at right.

200-V specifications 090 - 110

"100" is displayed when the input voltage is 200 V.
220-V specifications 100 - 120

230-V specifications 105 - 125 "110" is displayed when the input voltage is 100 V (for
100-V, 380-V, 400-V 100 - 120 100-V specs.), 380 V (for 380-V specs.).

5. Press the TEST switch (3) once more to return the display to the normal condition.

9-13. Clearing all memory settings

If the sewing machine stops operating normally, the cause may be that an incorrect memory setting may have been
made by means of the memory switch, for instance. In such cases, carry out the following procedure to clear the memory,
and also check the DIP switch settings.
While pressing the R/W switch (1), turn on the power. This will clear all of the memory setting.
Note
This operation causes memory switch settings to be returned to their initial settings, and also clears all contents of the
memory such as sewing datas.

(1)
1279S
1278S

BAS-341F, 342F
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10. DIP SWITCH

10. DIP SWITCH

Note
All DIP switches are set to OFF at the time of shipment.
When changing DIP switch, the power must be off.

10-1. Panel DIP switch functions

1224S

DIP switch A

SW No. When ON

A-1 After sewing is complete, the work clamp is raised by the operator and does not rise automatically.

• Various setting combinations for DIP switch No. 2, No. 3 and No. 4 can be used to change the way the work clamp is
raised and lowered.
• The operation mode can be changed using the two-stage work clamp switch. (Special order)

SW SW SW
Type Function of work clamp pedal
A-2 A-3 A-4

- - - Pneumatic Work clamp and presser foot rise and lower simultaneously.
Only work clamp rises and lowers; presser foot lowers when starting
ON - - Pneumatic
switch is pressed.
- ON - Pneumatic For split-type presser foot, the left/right order changes alternately.
Only work clamp rises and lowers; presser foot lowers when starting
ON ON - Pneumatic
switch is pressed.
- - ON Pneumatic Work clamp and presser foot rise and lower simultaneously.
Lowers in the order right work clamp, left work clamp, presser foot;
ON - ON Pneumatic
reverse order when rising.
Lowers in the order left work clamp, right work clamp, presser foot;
- ON ON Pneumatic
reverse order when rising.
Lowers in the order left and right work clamp, presser foot; reverse order
ON ON ON Pneumatic
when rising.

BAS-341F, 342F
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 10. DIP SWITCH

DIP switch A

SW No. When ON

A-5 After sewing is completed, work clamp does not automatically rise (only in split mode)

A-6 Clamping force output is produced (Inner clamping device available as an option)

Single-pedal operation using the starting switch; when the starting switch is pressed, the work clamp
A-7
drops, and when it is released, sewing starts.

A-8 Thread breakage detector device is activated

DIP switch B

SW No. When ON

B-1 Single split mode activated

B-2 Feed movement when not using work clamp, activated

B-3 Thread is not trimmed after an emergency stop.

B-4 Needle cooler output is produced.

When a rotating-type thread breakage detector device is used, detection precision is increased from 8 to 14.
B-5
When a fiber-type thread breakage detector device is used, detection precision is increased from 5 to 10.

B-6 Fiber-type thread breakage detector device is ON, and DIP switch A - 8 is ON (available as an option)

When using a 3-stage pedal

B-7
If DIP switch A -2 is ON at the same time, the presser foot will drop at the same time that work clamp drop.

B-8 Feeding speed is switched to high speed.

BAS-341F, 342F
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10. DIP SWITCH

10-2. DIP switches inside the control box

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

Main circuit board

1966S

■ DIP switch C
C-1 C-2 C-3 Model setting

- - -

ON - - BAS-311E

- ON - BAS-326E

ON ON - BAS-343E

- - ON BAS-341F

ON - ON BAS-342F

- ON ON

ON ON ON BAS-311EL

SW No. When ON

C-4 Controlled sewing area becomes 1200 mm X 400 mm

For pneumatic type, set to ON when the connection has been changed so that the work clamp remains
C-5
raised when the power is turned off.
C-6 When using an air-driven intermittent work clamp

C-7 -

C-8 -

BAS-341F, 342F
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 10. DIP SWITCH

DIP switch D

SW No. When ON

D-1 The first two stitches at the sewing start will be sewn at low speed (approx. 260 rpm)

D-2 The last two stitches at the sewing end will be sewn at low speed (approx. 260 rpm)

D-3 -

D-4 The last two stitches at the sewing end will be sewn at low speed (approx. 700 rpm)

D-5 -

D-6 Slow-speed sewing at the sewing start will be canceled

When the upper shaft is stopped, the motor will change direction and the needle bar will return
D-7
to the vicinity of the needle up stop position*
D-8 During an emergency stop, the thread is trimmed and the needle bar stops in the raised position.

* When the motor operates in reverse to raise the needle, the thread take-up will stop at a position which is lower than
its normal stopping position. As a result, the thread take-up will rise slightly at the sewing start, and this may result in
the thread pulling out under certain conditions.

BAS-341F, 342F
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11. CHANGING SPECIAL FUNCTION AND USING THE MEMORY SWITCHES

11. CHANGING SPECIAL FUNCTIONS AND

USING THE MEMORY SWITCHES
The functions of the switches on the operation panel can be changed to carry out special functions.
* All of the memory switches are set to OFF at the time of shipment.
Note
The following are special uses. All of the memory switch is usually set to OFF.

(5)

(7)
(3)
(6)

(4)

(1) (2) 1281S

1. Turn on the power switch.

2. While pressing the TEST switch (1), press the STEP BACK switch (2) to switch to setting mode.
3. Press the program select switch (4) so that the number displayed on the display screen (3) matches the switch number
(00 - 3F) for the function that you would like to select from the table.
4. Press the STEP BACK switch (2) to switch the setting appearing in the display screen (5) from OFF to ON.

1286S

If pressed once more:

1287S

If the B.T. CHANGE switch (6) is pressed at this time, all memory switch settings will be changed to OFF.
5. Press the TEST switch (1). The display will return to normal.
Note
The following steps set the memory switch settings separately for each program number.
6. Once the program data has been read from the floppy disk, change to memory switch setting mode and then press the
B.T SET switch (7). The buzzer will sound twice, and the current memory switch settings will be written to the floppy
disk.

BAS-341F, 342F
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 11. CHANGING SPECIAL FUNCTION AND USING THE MEMORY SWITCHES

Memory switches (00 - 0F)

Switch No. When ON

When moving to the home position, the feed plate moves in the order X Y and the start position
memo-00
moves in the order Y X.
When moving to the home position, the feed plate moves in the order Y X and the start position
memo-01
moves in the order X Y.
The forward position becomes the home position, and movement is in the order Y X and
memo-02 X Y.
Use when there is an obstacle at the center of the work clamp.
memo-03 Eject device operates. (Eject device is available by special order.)

memo-04 Needle stops in up position during emergency stop. (Needle normally stops in down position.)

memo-05 When sewing is finished, the feed plate moves via the machine home position to the start position.

memo-06 After the final stitch, the work clamp rises and then the feed plate returns to the start position.

memo-07 Intermittent work clamp is not used (does not rise).

When using an inner clamping device, the clamping presser is ON for 1/4 and OFF for 3/4 of the
memo-08
pattern. (Inner clamping device is available as an option.)
memo-09 Changes the wiper to air drive. (Air wiper is availabe as an option.)

memo-0A Jog feeding becomes faster during programming.

memo-0b ON when a two-stage tensioner is used. (Two-stage tensioner is available as an option.)

memo-0c Single-pedal operation by means of two-stage work clamp switches. DIP switch A-2 is ON

memo-0d Clearing the emergency stop switch action is carried out using the STEP BACK switch.

memo-0E Test feeding is carried out at the same speed as normal sewing. (For checking feed operation)
After sewing is finished, the work clamp automatically opens and closes once. (practice operation)
memo-0F
If memo-0E is ON, the work clamp opens and closes twice.

BAS-341F, 342F
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11. CHANGING SPECIAL FUNCTION AND USING THE MEMORY SWITCHES

Memory switches (10 - 1F)

Switch No. When ON

memo-10 Milling device can be used (available as an option)

memo-11 Bobbin thread counter and production counter are adjusted when thread is trimmed.
Work clamp is lowered by pressing work clamp first stage switch twice, without using work clamp
memo-12 second stage switch. When DIP switch A-2 is ON, work clamp lowers in the order right left;
when OFF, work clamp lowers in the order left right. Order is opposite when rising.
When work clamp is lowered, the starting switch causes locking; if the switch is released before
locking, the work clamp rises
memo-13
When DIP switch A - 2 is ON, work clamp lowers in the order right left; when OFF, work clamp
lowers in the order left right. Order is opposite when rising
memo-14 Needle up error detected.
ON when machine is equipped with signal tower indicator. (This indicator is available by special
memo-15
order.)
memo-16 ON when machine is equipped with thread nipper. (Thread nipper is available by special order.)

memo-17 ON when machine is equipped with reset switch. (Reset switch is available by special order.)
Starting switch causes work clamp to drop in order right left forward control is in the same
order as starting, and for backward control the work clamp rises in the order left right using
memo-18
work clamp first stage switch (when DIP switch A-2 is ON). When OFF, the left and right orders are
reversed.
Produces two work clamp signal outputs (right and left work clamp) so that a two-position air valve
memo-19
can be used. (Two-position air valve is available by special order.)
When using a triple pedal (DIP switch B-7 is also ON), the right is used exclusively to detect the
home position. If DIP switch A-7 is OFF, the left pedal causes left and right work clamps to be raised
memo-1A
and lowered simultaneously. If ON, the left pedal causes the left work clamp to be raised and
lowered, and the right work clamp lowers when starting pedal to sew.
memo-1b KE430C single foot pedal can be used. DIP switch A-7 is ON.

memo-1c Bobbin thread counter is decremented at the start of sewing.

When using an air pressure drop detection switch. (This detection switch is available by special
memo-1d
order.)
Changes the split number automatically by using an external switch. (Use option connector P3 on
memo-1E
the operation panel.)
Program number is changed automatically by using outside switch. (Use optional connector P3 on
memo-1F
the operation panel.)

BAS-341F, 342F
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 11. CHANGING SPECIAL FUNCTION AND USING THE MEMORY SWITCHES

Memory switches (20 - 2F)

Switch No. When ON

During feed test operation, jump feeding 100 stitches at a time is possible using the STEP BACK
memo-20
switch.
After the home position is detected and the machine moves to the sewing start position, the work
memo-21
clamp rises automatically.
memo-22 When extended option output No. 1 is ON, the sewing machine starts automatically.

memo-23 Set to ON when the bobbin changer is being used. (This part is available by special order.)
Feed operation is enabled even if no cassette has been set when the eject device is being used
memo-24
(memo-03 is ON).
memo-25 -

memo-26 -

memo-27 -

memo-28 -.

memo-29 -

memo-2A -

memo-2b -

memo-2c -

memo-2d -

memo-2E -
When the input voltage is being checked, the display shows the temperature of the heat sink on the
memo-2F
main circuit board instead of the voltage.

Extended option output

Use the programmer (option).
Required controls for pressing motion and automatic stacking of sewing can be implemented according to various
functions of the machine.
For detail of the extended option output, please consult with your local Brother Sales Office.

BAS-341F, 342F
48
11. CHANGING SPECIAL FUNCTION AND USING THE MEMORY SWITCHES

Memory switches (30 - 3F)

Turn the dial while pressing the STEP BACK switch to change the values.
Possible Initial
Switch No. Units Value
Explanation
setting range
Time until feed mechanism starts moving after work clamp has
memo-30 1 - 999 X 10ms 10 lifted.
Changes the feed speed.
memo-31 1-4 - 1
1 (Fast) 4 (Slow)
Changes the possible sewing speed for a given stitch length.
1 (Fast) 7 (Slow)
1 (2,700/3 mm), 2 (2,600/3 mm), 3 (2,500/3 mm),
memo-32 1-7 - 3 4 (2,300/3 mm), 5 (2,000/3 mm), 6 (1,800/3 mm), 7 (1,200/3 mm)
Settings 1 and 2 are outside the warranty specification at the
time of shipment from the factory.)
Changes the feed timing.
memo-33 1 - 10 X 7.5 5 1 (Fast) 5 (standard) 10 (Slow)
memo-34 1-5 stitch 1 Number of low-speed stitches sewn at 400 rpm at sewing start.
memo-35 10 - 60 ms 40 -
The solenoid ON time when the presser foot is raised changes.
memo-36 1-3 - 1 (Standard) 1 3 (Upper limit)
Automatically corrects the gear speed when reading 2DD disks.
0 : No automatic correction
1 : Read as BAS-311A data
memo-37 0-3 - 0
2 : Read as BAS-326A data
3 : Read as BAS-341A, 342A data
ex. Read BAS-326A data by BAS-342F / Set memo-37=2
Changes the length of time from inserting the cassette until
automatic
memo-38 1 - 20 X 100 ms 1 starting when the eject device is being used and automatic starting has
been set (memo-03 and DIP switch A-7 are also both ON).
Changes the reference point for enlargement and reduction using
the operation panel.
0 : Sensor home position
1 : Center of work clamp
2 : Upper-left corner of work clamp
3 : Lower-left corner of work clamp
memo-39 0 - 11 - 0 4 : Upper-right corner of work clamp
5 : Lower-right corner of work clamp
6 : Sewing start point, 7 : Sewing end point
8 : Upper-left corner of sewing pattern
9 : Lower-left corner of sewing pattern
10 : Upper-right corner of sewing pattern
11 : Lower-right corner of sewing pattern
Changes the speed limit for the given sewing pitch when the
maximum speed remains constant.
1 : Speed limit is increased for the given sewing pitch and the
sewing speed for that pitch is increased.
2 : Standard
3 : Speed limit is decreased for the given sewing pitch and the
memo-3A 1-3 - 2 sewing speed for that pitch is decreased.
Note
If sewing slippage occurs in places where a large sewing pitch is
used, reduce the setting to 3.
Furthermore, sewing slippage may occur in some cases if setting
1 is used.
memo-3b - - 0 -
memo-3c - - 0 -
memo-3d - - 0 -
memo-3E - - 0 -
memo-3F - - 0

BAS-341F, 342F
49
 12. ERROR CODES

12. ERROR CODES

Note
• If an operation problem occurs, a buzzer will sound and an error code will appear on the display screen; if a
programmer is connected, an error message will appear on the screen.
• Wait 10 seconds or more after turning the power off before turning it back on again.

Code Cause Remedy

E.10 Emergency stop switch was pressed. Press the emergency stop switch once more to cancel.
Press the emergency stop switch once more to cancel.
Emergency stop switch was pressed during
E.11 The STEP BACK switch can then be used to resume
sewing.
sewing.
Emergency stop switch is being continually
E.12 Turn off the power and check.
pressed, or emergency switch connection error.
Turn off the power, and then turn the machine pulley to
Problem with machine motor stopping, or check if the machine has locked up. Check the
E.20
synchronizer connection error. synchronizer connection. Check if connectors P14, P15
or P16 are disconnected.
Turn off the power and check the ground wire
E.21 Machine motor operation error.
connection.
Turn the pulley to align the index mark with the needle
E.22 Needle up stop position error.
up stop position. Check the V-belt tension.
Data is outside possible sewing area due to
E.30 Check the enlargement or reduction ratio setting.
enlargement or reduction ratio setting.
Data pitch exceeds 12.7 mm due to enlargement or
E.31 Check the enlargement or reduction ratio setting.
reduction ratio setting.
E.32 No end code was input into sewing data. Input an end code, or change the program number.
Insert a floppy disk. If floppy disk is already inserted,
Floppy disk is not inserted, disconnected cord
E.40 turn off the power and check the connections of cords
inside operation panel, or malfunction of drive.
inside the operation panel.
Program number is invalid, no data, or floppy disk is
E.41 Check the floppy disk.
not formatted.
Floppy disk changed from readable disk when
E.43 setting the bobbin thread or when setting the Replace with a readable floppy.
memory switch.
E.4F Other error when reading floppy disk. Replace the floppy disk and repeat the operation.

E.50 Floppy disk is write-protected. Remove the write-protection.

E.51 Insufficient space on floppy disk. Use a different floppy disk.

E.52 Floppy disk cannot be formatted Replace the floppy disk and repeat the operation.

E.5F Floppy disk write error. Repeat the operation.

E.60 Data backup is not possible. Turn off the power, wait a while and then turn it back on.
If the error appears continually, contact a qualified
E.61 Data cannot be backed up service technician.
E.70 Overlapping option output numbers. Change the option output number.
Thread breakage error detected by rotating-type
E.80 Thread the upper thread. Sewing can then resume.
thread breakage detector device.
Upper thread breakage error detected by optical
E.81 Thread the upper thread. Sewing can then resume.
fiber-type sensor.

BAS-341F, 342F
50
12. ERROR CODES

■ Error codes [E.9 * ] - [E.F * ]

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

Code Cause Remedy

Abnormal drop in power supply voltage, or power Turn off the power and check the input voltage.
E.90 was turned on again immediately after it was turned After turning off the power, wait 3 seconds or more
off. before turning it on again.
E.91 Abnormal rise in power supply voltage. Turn off the power and check the input voltage.

Starting switch was pressed without any valid

E.A0 Re-read the sewing data.
sewing data loaded.

Home position point was not detected within a Turn off the power and check the X-Y feed and the
E.A1 certain time during home position detection. home position sensor connection.

E.c0 Motor PROM is not correctly inserted. Turn off the power and check.

The box cooling fan (at the left when looking from Turn off the power and check whether any thread
E.c1 the front) is not operating. scraps have built up.

E.c2 Heat sink of control circuit board is abnormally hot. Turn off the power and clean the air intake port of the box.

E.c3 Abnormal current detected in X pulse motor. Turn off the power and contact a qualified service technician.

E.c4 Abnormal current detected in X pulse motor. Turn off the power and contact a qualified service technician.

The box cooling fan (at the right when looking from Turn off the power and check whether any thread
E.c5 the front) is not operating. scraps have built up.

E.d0 Air pressure drop error. Turn off the power and check.

E.E0 Main PROM is not correctly inserted. Turn off the power and check.

E.E1 Communication error detected by control circuit board. Turn off the power, wait a while and then turn it back on.

E.E2 Communication error detected by panel circuit board. Turn off the power, wait a while and then turn it back on.

E.E3 Bad connection in cable between panel and box. Turn off the power and check.

Power relay is not operating (malfunction of power Turn off the power and contact a qualified service
E.F0 supply circuit board). technician.

Bad connection in cable between power supply

E.F1 Turn off the power and check.
circuit board and main circuit board.

E.F2 Abnormal current detected in power supply circuit board. Turn off the power and contact a qualified service technician.

REFERENCE segment LED alphabet

Panel display

Text display A B C D E F 6 H L O

BAS-341F, 342F
51
 13. GAUGE PARTS LIST ACCORDING TO SUBCLASSES

13. GAUGE PARTS LIST ACCORDING TO SUBCLASSES

The following parts are available for the BAS-341F.342F for adding further flexibility to the range of applications.

Model BAS-341F,342F
Subclass -21 -22
Use
Heavy materials Medium materials
Part name
Needle hole plate
Needle hole plate E Needle hole plate F
(Φ2.6) (Φ2.2)
S10212-101 S10213-001
0182Q
Shuttle hook assembly Shuttle hook assy Shuttle hook assy
W / BOX
W /BOX S15663 W /BOX S15662
(LB) (LA)
0188Q SA1894-001 SA1892-001
Large shuttle hook
Large shuttle hook B Large shuttle hook A
152686-101 152682-101
0189Q

Tension spring
Tension spring B Tension spring
144588-001 145519-001
0191Q

Bobbin case assembly

Bobbin case Bobbin case
assembly LB assembly LA
S15903-401 S15902-401
0183Q

Needle bar thread guide

Needle bar thread Needle bar thread
guide A guide A
S02438-001 S02438-001
1639S

Needle
DP x 17#21 DP x 5#16
145646-021 107415-016
0193Q

Feed plate BAS-341F

Feed plate C
1972S
S47138-101

BAS-342F
Feed plate N
1967S SA1513-001
Work clamp
Work clamp A Work clamp A
S42843-001 S42843-001
1288S

Spring
Spring Spring
107606-001 104525-001
0190Q

BAS-341F, 342F
52
14.NOTES ON THE PROCESSING AND PRODUCTION OF PLATE BLANKS

14. NOTES ON THE PROCESSING AND

PRODUCTION OF PLATE BLANKS

Plate blank Plate blank

After processing After processing

1968S

* Chamfer other corners of the reverse side of the plate blank with a thickness of C0.3 or thicker, and finish the corners
with fine sand paper.
Please carry out the following points to chamfer the reverse side of the plate blank when using the plate blank for any
supplementary processing of material.

*Cross-section A-A’

Point at which to use

Use fine sand paper sand paper, etc.
or similar material
to acquire a smooth
surface for this section.

1969S 1970S

BAS-341F, 342F
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 15. TROUBLESHOOTING

15. TROUBLESHOOTING
Problem Cause Check Remedy Page

Work clamp operation Sliding part of the work Grease the sliding part of
is sluggish. clamp lubrication the work clamp.
Presser does not rise.
Presser lifter air tube is Straighten the bend in the
Presser lifter air tube
bent or damaged. tube or replace the tube.

Work clamp operation Sliding part of the work Grease the sliding part of
is sluggish. clamp lubrication the work clamp.
Presser does not drop.
Presser lifter air tube is Straighten the bend in the
Presser lifter air tube
bent or damaged. tube or replace the tube.

Presser lift amount is Incorrect position of Distance between work clamp Adjust the work clamp lift
37
incorrect. presser arm lever F. and top of needle plate amount.

Solenoid-type work clamp Work clamp pressure is Check the setting of the Increase the setting value
lifts up without clamping of the memory switch 49
the material. too light. memory switch (memo-35). (memo-35).

The thread wiper is Clearance between thread Adjust the height of the
38
Thread wiper does not obstructing the needle. wiper and needle tip thread wiper.
operate correctly.
Thread wiper position is Adjust the operating distance
Thread wiper position 38
incorrect. of the thread wiper.

Lower thread winds to Bobbin winder thread Bobbin winder thread Adjust the height of the
tension stud heights is 11
one side. incorrect. tension stud height thread tension stud.

Lower thread winding Bobbin presser position Adjust the position of the
Thread winding amount 11
amount is incorrect. is incorrect. bobbin presser.

Stitches being skipped Refer to “Skipped Refer to “Skipped

at the sewing start. stitches occur”. stitches occur”.

Thread slips out of the Uneven upper thread

Upper thread length Adjust the sub-tension. 13
needle. length.

Position of shuttle race Position of shuttle race Adjust the position of the
33
thread guide is incorrect thread guide shuttle race thread guide

BAS-341F, 342F
54
15. TROUBLESHOOTING

Problem Cause Check Remedy Page

Upper thread tension is Adjust the upper thread

Upper thread tension 13
too strong. tension.

Needle is installed Install the needle so that the

Needle direction 9
incorrectly. groove is facing forward.

Thread is too thick for Use the correct thread

Thread and needle 12
the needle. for the needle.
Thread take-up spring Thread take-up spring Adjust the tension and
Upper thread breaks. tension and height are height of the thread take- 13
incorrect. tension and height up spring.
Damaged or burred File smooth or replace
shuttle hook, needle hole Damage or burring
plate or needle. the affected part.

Thread melting Use a thread cooling

Thread edge 10
(synthetic thread) device.

Pass the thread correctly

Thread path is incorrect. Thread 10
along the thread path.

Lower thread tension is Adjust the lower thread

Lower thread tension 13
too strong. tension.
Lower thread breaks.
Corners of needle hole File smooth or replace
plate or bobbin case Damage
are damaged. the affected part.

Clearance between needle Adjust the needle clearance.

and shuttle hook tip is too Needle clearance 33
great. the affected part.

Incorrect needle and Adjust the needle bar lift

Needle bar lift amount 32
shuttle hook timing. amount.

Driver is contacting needle Clearance between Adjust the driver needle

Skipped stitches occur. 33
more than is necessary. driver and needle guard.

Needle is bent. Bent needle Replace the needle.

Needle is installed Install the needle so that the

Needle direction 9
incorrectly. groove is facing forward.

Adjust the needle clearance.

Needle clearance 33
the groove is facing forward.
Needle is touching the
shuttle hook.
Adjust the needle bar lift
Needle bar lift amount 32
amount.

Needle breaks. Needle is bent. Bent needle Replace the needle.

Select the correct needle for

Needle moves about. Needle and thread the sewing conditions. 12
Reduce the sewing speed

Use the correct needle

Needle is too thin. Needle and thread 12
for the material.

BAS-341F, 342F
55
 15. TROUBLESHOOTING

Problem Cause Check Remedy Page

Sharpen or replace the

Fixed knife is blunt. Fixed knife blade
fixed knife.

Shuttle race thread Adjust the position of the

33
guide position shuttle race thread gudie.
Movable knife does not
pick up the thread.
Adjust the needle bar lift
Needle bar lift amount 32
amount.
Upper thread is not
trimmed. The movable knife does not pick Skipped stitches at Refer to “Skipped
up the thread because of skipped
stitches at the sewing end. sewing end stitches occur”.

Movable knife position Adjust the position of the

Movable knife position 34
is incorrect. movable knife.

Turn the sub-tension nut

Sub-tension is too weak. Sub-tension 13
to adjust the tension.

Thread take-up spring Thread take up spring Adjust the tension and
tension and height are height of the thread take- 13
incorrect. tension and height up spring.

Incorrect needle and Adjust the needle bar lift

Thread jamming. Needle bar lift amount 32
shuttle hook timing. amount.
Shuttle race thread guide Shuttle race thread Adjust the position of the
is not separating the 33
threads. guide position shuttle race thread guide.

Shuttle race thread Shuttle race thread Adjust the position of the
guide is not separating 33
the threads. guide position shuttle race thread guide.

Poor seam finish on Upper thread is not Upper thread tension Adjust the upper thread
13
reverse side of material. properly tight. tension.

Uneven upper thread Upper thread length Adjust the sub-tension.

13
length.

Upper thread tension is Upper thread tension Adjust the upper thread
13
too weak. tension.

Incorrect thread Lower thread tension is Lower thread tension Adjust the lower thread
13
tightness. too weak. tension.
Thread take-up spring Thread take-up spring Adjust the tension and
tension and height are height of the thread take- 13
incorrect. tension and height up spring.

BAS-341F, 342F
56
15. TROUBLESHOOTING

Problem Cause Check Remedy Page

Improper tension and height Thread take-up spring Adjust the tension and
height of the thread take- 13
of thread take-up spring tension and height up spring.

Improper adjustment of Adjust the sub tension.

sub tension 13
Unstable upper thread sub tension
length
Needle up stop position See “Unstable needle
fluctuates. up stop position”.

Sharpen or replace the

Fixed knife is blunt. Fixed knife blade
fixed knife.

Inadequate adjustment Adjust the tension of the

Tension pulley position V belt using the tension 5
of V belt tension pulley
Unstable needle up
stop position
Electrical trouble Refer to the details for [E.
50
22] in the error code table.

BAS-341F, 342F
57
 16. OPTION

16. OPTION
■ Programmer assy Used to create sewing patterns for the BAS-300E series.
It can also be used to display error messages.

■ Inner clamp device Used for efficient sewing around labels, emblems and tape;
operates by air together with the outer presser, so material
slippages will not occur.

■ One-touch clamping device Allows the clamp to be replaced quickly and easily, without the
need for extra tools. The positioning adjustment that has been
previously required for other clamps is no longer necessary.

■ Milling device This device can be used to cut a variety of objects such as
grooves, holes, and outlines shapes in plastic or aluminum
sheets.

■ Automatic bobbin changer When the amount of bobbin thread remaining becomes low, this
device automatically replaces the bobbin. This reduces the need
for tasks such as checking the amount of bobbin thread remaining
and replacing bobbins, so that productivity can be increased.

■ Snap fastener and hook This attachment is for holding snap fasteners and hooks.
attachment device

■ Needle thread presser device This allows the upper thread to be securely placed under the
material for the first stitch at the sewing start.

BAS-341F, 342F
58
16.OPTION

■ Thread breakage detector Available as rotary type or fiber type, stops sewing when a thread
breakage is detected and warns the operator.

■ Needle cooler This is a pneumatic-type needle cooler which prevents the thread
breaking due to heat. It is particularly useful when sewing thicker
materials at high sewing speeds.

■ OT Presser Use according to particular sewing needs in order to provide an

even clamping force.

■ Soft presser At the first stage, the work clamp applies only a spring force so
that the material can be positioned. Then at the second stage, air
pressure provides a full clamping force.

■ Cassette presser This allows the operator to hold two clamps so that the
preparation for the next operation can be carried out while sewing
is in progress.
Overlapping operations are thus possible, which can greatly boost
productivity.

■ Play prevention work clamp This work clamp prevents any play from occurring in the clamp.

■ Thread wiper the side Wipes the upper thread away to the side when an inner clamping
device is being used.

■ Air wiper device The thread wiper is driven by a pneumatic cylinder.

Allows the upper thread tension to be switched between two

■ 2-step thread tension device settings at any position desired by using the programmer.

BAS-341F, 342F
59
 INSTRUCTION MANUAL

15-1, Naeshiro-cho, Mizuho-ku, Nagoya 467-8561, Japan. Phone: 81-52-824-2177

Printed in Japan 151-V41,42

SA1929-001
2002.11. H (1)