REFRIGERATOR

SERVICE MANUAL
CAUTION
PLEASE READ THE SAFETY PRECAUTIONS OF THIS MANUAL CAREFULLY
BEFORE REPAIRING OR OPERATING THE REFRIGERATOR

MODELS:

LSC27910SW /01
LSC27910ST /01
LSC27910TT /01
LSC27910SB /01
ECN (Engineering Change Number)

Rev.01
Change Base Compressor (due to Back Prone Loading transportation)
Items related to this change:
•Damper,Compressor (312A)
•Stopper,Compressor (314A)
•Base Assembly,Compressor (315A)
WARNINGS AND SAFETY PRECAUTIONS .......................................................................... 3

1. SPECIFICATIONS ............................................................................................................... 4

2. PARTS IDENTIFICATION ................................................................................................... 5

3. HOW TO INSTALL THE REFRIGERATOR ........................................................................ 6

4. HOW TO DISASSEMBLE AND ASSEMBLE...................................................................... 10

5. MICOM FUNCTION ............................................................................................................. 15

6. EXPLANATION FOR MICOM CIRCUIT .............................................................................. 25

7. ICEMAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR............................ 42

8. CIRCUIT .............................................................................................................................. 48

9. TROUBLE DIAGNOSIS ...................................................................................................... 49

10. EXPLODED VIEW ............................................................................................................. 88

-2-
 WARNINGS AND PRECAUTIONS FOR SAFETY
Please observe the following safety precautions to use the 8. Do not fray, damage, run over, kink, bend, pull out, or
refrigerator safely and correctly and to prevent accident or twist the power cord.
injury when servicing.
9. Please check for evidence of moisture intrusion in the
1. Be careful of an electric shock. Disconnect power cord electrical components. Replace the parts or mask with
from wall outlet and wait for more than three minutes before insulation tape if moisture intrusion was confirmed.
replacing PWB parts. Shut off the power whenever
replacing and rapairing electric components. 10. Do not touch the icemaker with hands or tools to
2. When connecting power cord, wait for more than five confirm the operation of geared motor.
minutes after power cord was disconnected from the wall
outlet. 11. Do not suggest that customers repair their
refrigerator themselves. This work requires special tools
3. Check if the power plug or card is pinched between the and knowledge. Non-professionals could cause fire,
refrigerator and the wall. If the cord is damaged, it could injury, or damage to the product.
cause fire or electric shock.
12. Do not store flammable materials such as ether,
4. If the wall outlet is ocerloaded, it may cause a fire. Use a benzene, alcohol, chemicals, gas, or medicine in the
dedicated circuit for the refrigerator. refrigerator.

5. Be sure the outlet is grounded. This is particulary 13. Do not put anything on top of the refrigerator,
important in wet or damp areas. especially something containing water, like a vase.

6. Use standard electrical components. 14. Do not put glass bottles full of water into the freezer.
The contents will freeze and break the glass period.
7. Make sure hooks are correctly engaged.
Remove dust and foreign materials from the housing and 15. When you scrap or discard the refrigerator, remove
connecting parts. the doors and dispose of it where children are not likely
to play in or around it.

-3-
 1. SPECIFICATIONS

LSC27910SW

LSC27910SW
LSC27910SB

LSC27910SB
LSC27910ST

LSC27910ST
LSC27910TT

LSC27910TT
MODELS

MODELS
SPECIFICATIONS SPECIFICATIONS

Color Super white Stainless Titanium Black Case Material Embo (normal)

Dimensions 36 x 33 x 70 in Door Material PCM Stainless VCM VCM

Net Weight 286.6 lbs Handle Type Vista

REFRIGERATOR
Capacity 27 cuft Display Graphic A-LG
Refrigerant R134a (185gr) Basket, Quantity 3 full + 1half
Climate class Temperate (N) Ice Tray & Bank AUTO ICE MAKER+ SPACE PLUS
Rated Rating 115V~ / 60Hz Magic Crisper Yes
Cooling System Fan Cooling Lamp Yes (1) 40W/Blue
GENERAL FEATURES

Temperature Control MICOM control Shelf 1 (Fix) + 2 (S/Out)

Full Automatic Tray meat Yes
Defrosting System
Heater Defrost Egg Bank No
Insulation Cyclo, Pentane Basket, Quantity 3 Plastic

FREEZER
Compressor LD72LACH PTC Starting Type Lamp Yes (1) 40W/Blue

Evaporator Fin Tube Type Shelf 3 EA (Wire)

Condenser Wire Condenser
Lubricanting Oil Polyol Ester 310 ± 10 cc
Drier MOLECULAR SIEVE XH-7
Capillary Tube ID Ø0.83
First Defrost 4 Hours
Defrost Cycle 13 - 70 Hours
Defrosting Device Heater, Sheath
Anti-freezing Heater Water Tank Heater

912 mm (35 29/32 in.)

908 mm (35 11/16 in.)
779 mm (305/8 in.)
830 mm (325/8 in.)
891 mm (355/16 in.)
1261 mm (495/8 in.)
724 mm (281/2
1771 mm (6911 /16 in.)

1741.5 mm (681/2 in.)

1746.5 mm (683/4 in.)
1771 mm (6911 /16 in.)

Front View Top View

-4-
 2. PARTS IDENTIFICATION

A G

B H

C J

K
B

L
D

E M

D
L
F

Use this page to become more familiar with the parts and features. Page references are included for your
convenience.
Note: This guide covers several different models.The refrigerator you have purchased may have some or
all of the items listed below. The locations of the features shown below may not match your model.

A Freezer Shelf I Refrigerator Lamp

Ice Bin
B For storage of ice cubes made by the icemaker. J Refrigerator Shelf
Do not store anything except ice in the ice bin.

C Freezer Lamp K Snack Pan

For storage of meat or fresh food.
D Freezer Door Rack L Refrigerator Door Rack
E Drawer M Vegetable Drawer
PWB Cover
F Base Grille
G Dairy Corner
For storage of dairy products Display Frame Water Tubes
such as butter and cheese.
Dispenser Lamp
H Water Filter
Ice & Water
Dispenser Button

-5-
 3. HOW TO INSTALL THE REFRIGERATOR
1. DOOR ALIGNMENT Adjust the level when the refrigerator door is lower than
the freezer door during the installation of the refrigerator.
Before adjust the doors, remove the Base Grille.

If the freezer compartment door is lower than Tools you need

the refrigerator compartment door, make them • Wrench 5/16 in (8 mm)
level by inserting flat blade screwdriver into the • Wrench 3/4 in (19 mm)
groove of the left leveling leg and rotating it
clockwise.

Height
Height difference
Keeper nut
difference

Wrench

Left leveling Height Adjustment Up

leg Height difference hinge pin
difference
Down

Using a ¾” (19 mm) wrench, turn the keeper nut clockwise

to lossen the keeper nut.
If the freezer compartment door is higher than the
refrigerator compartment door, make them level by Using a 5/16” (8 mm) wrench, turn the adjustment hinge pin
inserting flat blade screwdriver into the groove of clockwise or counterclockwise to level the refrigerator and
the right leveling leg and rotating it clockwise. freezer door.

After setting the level door, turn the keeper nut

counterclockwise to tighten.
Height
Do not over tightening the door adjustment screw. The
difference
hinge pin can be pulled out. (Adjustable range of height is a
maximum of ½” (1.27 cm)).

AFTER LEVELING THE DOOR HEIGHT

Left leveling leg
Height Make sure the front leveling legs are completely
difference touching the floor.

-6-
2. WATER FILTER

Before removing or installing water filter:

1. Take out the top shelf and move it to the lowest level.

2. Remove the lamp cover by pressing the tab under

the cover and pulling cover to the front.

3. IMPORTANT: Turn off household water supply.

Installing the water filter

Remove red cap from the filter and insert the two
tabs on the filter tip into the two slots in the
refrigerator filter receptacle. You should feel the filter
entering completely. Turn the filter to the right a quarter
turn clockwise to lock it into place. The locked symbol
will be lined up with the indicator arrow.

Removing the water filter:

1. For first-time installation, remove filter substitute cap After installing water filter
(A) by turning it counterclockwise a quarter turn and a) Replace the cover lamp and shelf to the initial
pulling it down. position.
2. For subsequent installation, remove old filter by b) Dispense 2.5 gallons (9.46 L) of water to purge the
slowly turning it to the left a quarter turn and pulling it system (dispense for approximately 5 minutes). Open
down. the refrigerator door and check the shelf area for
leaks.
c) After installing filter, turn on household water supply.

-7-
 3. HOW TO CONTROL THE AMOUNT OF WATER SUPPLIED TO ICEMAKER

3-1. Confirm the amount of water supplied to the icemaker

.
1. Pull out the ice bin shelf in the upper part of the freezer compartment.

Caution: •Do not put hands or tools into the chute to confirm
the operation of geared motor.
It may damage the refrigerator or hurt your hands.

2. Turn on the electricity after connecting water pipe.

1) Press the test switch under the icemaker for two seconds as shown below.
2) The bell rings (ding ~ dong), the ice tray rotates, and water comes out the icemaker water tube.
3) The water is supplied into the tray two or three times. The amount is small each time.
Put a container under the ice tray and press test switch.
4) When the ice tray rotates,the water in it will spill. Collect the spilled water and discard it.
5) When ice tray has finished rotation, water comes out the water tube. Check the amount that goes into the ice tray. (Refer
to the drawing below. The optimum amount is 110cc. (Almost 4 oz.)).

* It is acceptable is the adjusted water level is less than the optimum level.

-8-
3-2 Control the amount of water supplied to the icemaker.
Caution: • Unplug the power cord from the wall outlet and wait at least three minutes before removing the main PWB cover.
310 Volts are present in the control panel.

Water Supplying Time Control Option

SWITCH
WATER SUPPLY TIME NOTE
SW2 SW1
OFF OFF 6.5s FACTORY SETTING
OFF ON 5.5s
ON OFF 7.5s
ON ON 8.5s

1) The water supplying time is set at five seconds when the refrigerator is deivered.
2) The amount of water supplied depends on the setting time and water pressure (city water pressure).
3) If the ice cubes are too small, increase the water supplying time. This happens when too little water is supplied into the ice
tray.
4) If the ice cubes stick together, decrease the water supplying time. This happens when too much water is supplied into the ice
tray.

Caution: When adjusting the amount of water supplied, adjust step by step. Otherwise the water may spill over.

3. When the adjustment of the control switch for the amount of water supplied is complete, check the level of water in the ice.

-9-
 4. HOW TO DISASSEMBLY AND ASSEMBLE
1. REMOVING AND REPLACING (2)
REFRIGERATOR DOORS (1)

Before remove the doors, remove the Base Grille.

To remove the right (refrigerator) door:

(4) (3) (5)
(7)

(1) (5) (6)

(2) (6) Rivet
(7)

Type 1 Type 2
(3)
(4)
(5)
(3) 1. Open the door. Remove the top hinge cover screw (1).
Rivet 2. Use a flat blade screwdriver to pry back the hooks
Type 1 (not shown) on the cabinet underside of the cover (2).
(4) (5) Lift up the cover.
Type 2 3. Disconnect all the wire harnesses (3).
4. Remove the grounding screw (4).
1. Open the door. Remove the top hinge cover screw (1).
5. Rotate hinge lever (5) counterclockwise. Lift the top
2. Use a flat blade screwdriver to pry back the hooks hinge (6) free of the hinge lever latch (7).
(not shown) on the cabinet underside of the cover (2).
Lift up the cover. NOTE: Regardless the type of hinge lever (5);
type1: without rivet or type 2: with rivet the
3. Rotate the hinge lever (3) clockwise. Lift the top hinge
removal process is the same.
(4) free of the hinge lever latch (5).
NOTE: Regardless the type of hinge lever (3); CAUTION: When lifting the hinge free of the latch,
type1: without rivet or type 2: with rivet the be careful that the door does not fall forward.
removal process is the same.

4. Lift the door from the lower hinge pin. 6. Lift the door from the lower hinge pin being careful to
pull the water lines through the lower hinge pin.
5. Place the door, inside facing up, on a nonscratching
surface. 7. Place the door, inside facing up, on a nonscratching
surface.
CAUTION: When lifting the hinge free of the latch,
be careful that the door does not fall forward.

Removing the left (freezer) door with water line

connection.

• Pull up the water feed tube while pressing area

(Figure 1) as shown in the figure below.

• NOTE:If a tube end is deformed or abraded, trim the

part away. Disconnecting the tube under the door
causes about 0.5 liters water to flow out. Put a large
container at end of tube to prevent water from draining
onto the floor.

Figure 1

- 10 -
Reinstalling the rigth (Refrigerator) door 2. HANDLE REMOVAL

(1) • Loosen the set screws with a 3/32” (2.38 mm) Allen
wrench and remove the handle.
(2)
NOTE: If the handle mounting fasteners need to be
tightened or moved, use a 1/4” (6.35 mm) Allen wrench.
(3) (3)
(4)
(5) Rivet

(4)
(5) Mounting
Type 2 fasteners
Type 1

1. Place the door onto the lower hinge pin.

2. Fit top hinge (4) over hinge lever latch (5) into
place. Rotate lever (3) counterclockwise to secure
hinge.
NOTE: Regardless the type of hinge lever (3);
type1: without rivet or type 2: with rivet the Set screw
removal process is the same.
3. Hook tab on switch side of corner under edge of wire
opening in cabinet top. Position cover (2) into place.
Insert and tighten cover screw (1).

Reinstalling the left (Freezer) door

(2)
(1)

Allen Wrench

(3)
(4)
(7)

(5) (5)
(6) (6)
(7)
Rivet

Type 1 Type 2

1. Feed the water tubes through the lower hinge pin and
place the door onto the lower hinge pin.

2. Fit top hinge (6) over hinge lever latch (7) and into
place. Rotate lever (5) clockwise to secure hinge
NOTE: Regardless the type of hinge lever (5);
type1: without rivet or type 2: with rivet the
removal process is the same.
3. Install the grounding screw (4) and connect all the
wire harnesses (3).
4. Hook tab on door switch side of cover (2) under edge
of wire opening in cabinet top. Position cover into
place. Insert and tighten cover screw (1).
5. Reconnect the water tubes by inserting the tubes into
the connectors.

- 11 -
3. FAN SHROUD GRILLE 4. ICEMAKER ASSEMBLY

1. Loose one screw with a screwdriver blade. 1. Dispenser Model

2. Disassembly of an upper grille fan: Hold upper part of an
upper grille fan (U) and pull forward carefully. 1) How to disassemble:
3. Disassembly of a lower grille fan: Hold upper part of a (1) Remove ice bin from the freezer compartment.
lower grille fan and pull forward carefully. (2) Loose the screw on the upper part of icemaker bracket.
4. Disassembly of an upper freezer shroud: Hold lower part, (3) Disconnect icemaker bracket so that it can slide forward.
oull forward and disconnect housing A and B. (4) Disconnect icemaker housing and sensor housing.
5. Check foam sticking conditions around a shroud, upper (5) Disconnect icemaker horizontally by pressing bracket hook
freezer and lower freezer during assembling. If damaged part. (Don’t disassemble further. The set value may be
torn, or badly stuck, assemble with a new one afer sealing changed).
well.
2) The assembly is the reverse order of the above disassembly.

- 12 -
5. WATER VALVE DISASSEMBLY

• Disassembly
1. Pull out tube while pressing collets and disassemble it.
• Assembly
1.Insert tube until you can see only one line.
2. After inserting, pull out tube to check if it is properly
inserted.

Collet
Tube

Insert Line

- 13 -
7. DISPENSER

2) Remove the Display Frame moving out with both hands

in one side and make the same process in the other side
and pulling it forward like shows the picture.

- 14 -
5. MICOM FUNCTION
1. MONITOR PANEL
1-1. Display Second Function

2
1 Display Power Saving Mode

1. Buzzer sound mute Mode

The buzzer sound is set to OFF.

It activates by sounding the recognition sound of “Ding ~” after pressing and holding ICE PLUS” button more than 5
seconds. It inactivates when resetting the mode power.

2. Display OFF mode.

Display off mode puts the display into standby mode until the door is opened.
To put the display into Display off Mode, press and hols the FRZ. TEMP. and ICE PLUS buttons simultaneously for 5 seconds
until the Ding~sounds. (Use both buttons for this to work.) When Display off Mode is activated, the display remains OFF unless a
door is opened or a button is pressed. The display will return to the OFF position after 30 seconds inactivity.
To remove the display from Display off Mode, press and hold the FREEZER and ICE PLUS buttons simultaneously for 5 seconds
until the Ding~sounds. The Display off Mode default setting is OFF after a power interruption.

- 15 -
2. DESCRIPTION OF FUNCTION
2-1. FUNCTION OF TEMPERATURE SELECTION

Base

º º º º º

º º º º º

º º

Press the button to cycle through the settings in this order: (Medium) (Medium High) (High) (Low)

2-1-1 Lock Function (dispenser and display button lock)

1. In power application of refrigerator, the LOCK text is turned off at the right side of lock graphic of display with the lock
release status.
2. If you wish lock the controls, push on the ALARM/LOCK button for more than 3 seconds, after this time, the LOCK
graphic on the display will be turned on.
3. The buzzer sound and control panel and dispenser function is not performed even if pressing display button ather than
lock key in the lock status.
4. If you wish unlock the controls, press the ALARM/LOCK button more than 3 seconds. The LOCK graphic on the display
will be turned off.

- 16 -
2-1-2. Filter condition display function

1. There is a replacement indicator light for the water filter cartridge on the dispenser.
2. Water filter needs replacement once six months.
3. Water filter light and FILTER RESET HOLD 3 SECONDS text turn n to tell you need to replace the filter soon.
4. After replace the filter, press and hold the lock button more than 3 seconds.
Then water filter light and FILTER RESET HOLD 3 SECONDS text turn off with reset status.

2-2. Dispenser use selection

•
• ´ll

2-3. ICE PLUS

Please select this function for prompt freezer.
• Function is repeated folloing below whenever pressing ICE PLUS
•The arrow mark graphic remains at the On status after flickering 4 times when selecting Special Refrigeration ICE PLUS.
• ICE PLUS function automatically turns off if a fixed time passes.

2-4 Dispenser Light

• Dispenser switch or dispenser light button turn the dispenser light in the dispenser on and off.
• The dispenser light Function is repeated following below whenever pressing LIGHT/FILTER button.
• If dispenser light continuously turns on more than 7 minutes with dispenser light button, the dispenser light turns off
automatically by compulsion.

- 17 -
2-5 ICE PLUS
1. Ice Plus increases the cooling speed in the freezer by running the fan and the compressor simultaneously.
2. Ice Plus is released if the power fails and is restored.
3. The temperature setting is not changed when Ice Plus is selected.
4. You can change the temperature in the freezer and the refrigerator even if Ice Plus has been selected and is in progress.
5. The refrigerator operates independently of the Ice Plus setting and operation.
6. At the end of the Ice Plus cycle, the freezer defaults to its original setting.
7. If frost removal starting time is arrived during Ice Plus, Ice Plus operation is done only for the remaining time after
completion of frost removal when the Ice Plus operation time passes 90 minutes. If passing 90 minutes, Ice Plus operation
is done only for 2 hours after completion of frost removal.
8. If pressing Ice Plus button during frost removal, the Ice Plus LCD or LED is turned on but if pressing the Ice Plus,
compressor operates after the remaining time has passed.
9. If selection Ice Plus within 7 minutes (delay for 7 minutes of compressor) after the compressor stops, compressor
operates after the remaining time has passed.
10. The freezer fan motor operates at the high speed of RPM during operation of Ice Plus.

2-6 Control of variable type of freezing fan

2-7 Control of cooling fan motor

- 18 -
2-8. Door opening alarm

Closing

2-9. Ringing of button selection buzzer

2-10 Ringing of compulsory operation, compulsory frost removal buzzer

2-11 Defrost function

1. Defrost is performedwhenever total operation time of compressor becomes 7 - 50 hour.
2. In providing initial power (or returning power failure), frost removal starts whenever total operation time of compressor
becomes 4 - 5 hours.
3. Defrost is completed if temperature of a defrost sensor becomes more than 5°C after starting defrost. The defrost cycle will
fail if the refrigerator does not reach a temperature of 5°C (9°F) two hours into the defrost cycle.
4. The defrost cycle will not operate of the defrost sensor fails, arcs, or shorts cut.

2-12 Refrigerator lamp automatically off

- 19 -
2-13 Sequential operation of built-in product
Built-in products such as compressor, frost removal heater, freezing room fan, Cooling Fan and step motor damper are
sequentially operated as follows for preventing noise and part damage occurred due to simultaneous operation of a lot of
parts in applying initial power and completing test.

ºC
º

º
º

- 20 -
2-14. Failure Diagnosis Funtion

F4
F3
TROUBLE CODE
INDEX F2
F1

- 21 -
- 22 -
2-15. Test Function

ºC

- 23 -
2.16. Function of dispenser and water dispenser built-in

- 24 -
6. EXPLANATION FOR MICOM CIRCUIT
1. Explanation for PWB circuit

- 25 -
- 26 -
•
•
•

- 27 -
- 28 -
- 29 -
 º º

- 30 -
- 31 -
- 32 -
- 33 -
 º º º º
º º º º
º º º º
º º º º
º º º º
º º º º
º º º º
º º º º
º º º º
º º º º
º º º º

º º

- 34 -
•

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º‫﷨‬ º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

º º º º º º º º º º
º º º º º º º º º º

- 35 -
 OPTION

CON9

A 6
HEATER,SHEET
(DUCT-DOOR)

CC11* IC13* 5
104 10 M54563FP
IC1 MICOM

P11(INT1)
18 2 19 D107
4 10

19 3 18 D108
P12
3 9
20 4 17
P13 D109
2 8
21 5 16
P14 D110
1 7

22 6 15
CON5 D111
P15
11
6

23 7 14 D112
P16
10 5
11
L101 L102 L103 L104 L105 L106
IC14* (ÉÙ}) (ÉÙ}/) (ÉÙ) (ÉÙ/) (ÉÙ) ()
KID65003AF
9

P17
24 2 15 R29
9 4
360,1/2W L107 L108 L109 L110 L111 L112
(É¥}) (É¥}/) (É¥) (É¥/) (É¥) (¹ON)
R19

P20
25
4.7K
3 14 R30
8
3
360,1/2W L113 L114 L116
L115 L117
(¼L) (<) (p¼L) (FILTER) (Light)
R20
27 4.7K 4 13 R31
P21
360,1/2W
7 2
8 D101 D102 D103 D104 D105 D106 1N4148X6

R21*
28 2K 12 5 R22* R23 SW101 SW102 SW103 SW104 SW105 SW106
P22
2K
6
CC31* 100
102 1
IC14-1*

- 36 -
 º º

º º

º º

º º

º º
º º
º º

º º

º º

º º

º º

º º

º º

º º

►
►
►
►
►

- 37 -
2. PWB parts diagram and list

- 38 -
2-2 PWB Display

CON101
D107
10 D108
9 D109
8 D110
7 D111
6 D112

L101 L102 L103 L104 L105 L106

4
L107 L108 L109 L110 L111 L112

3
L113 L114 L115 L116 L117

D101 D102 D103 D104 D105 D106 1N4148X6

1 SW101 SW102 SW103 SW104 SW105 SW106

- 39 -
2-3 PWB Main Assembly

Part 1 BD1
D3SBA60 TRANS D3
+12V

1 RL3
10
R3(PRC) CM3
CE1
56K,2W 473
R2(PRC) 47uF +16V
8 /630V
560K /450V
L2 1/2W D1
15mH FB1 FR107 R8
32mH 2
12 D4 1.8K
RF2
R9* 1/4W 9.1KF
CM2 D2 RL3 1K
1/4W
220nF FR107 1/4W IC3
R5 5
275VAC CC3*
CE3 224/50V
R1(PRC) 82,1/4W 1000uF
330K, 1W R4 CE2
CE4 /25V
FUSE2 6.8K
1/4W
22uF
1000uF
/50V
250V/5A /35V
IC4 RF3
4 KIA431 2.4KF
4 1/4W
4
1
3 8
2
L1
5mH 8 R6
IC2 680, 1/4W
5

CM1 STR IC5

G6351 Rocp 64 VDD
CC1* 7805 55
471
1,1W Varef

CC5* CE5 CC6*

VA1 CC4*
220uF
3 104 104
/16V
104
CC2
FUSE1 221/2KV 32 Vss
250V/15A 54 Vass

TAB1 TAB2 26
TEST

CON1 9

RUNNING CAPACITOR
7
IC6*
STRATING CAPACITOR COMP RY1 KID65003AF
9
C-FAN OLP (ALE15B12)

5 D5
IN4004 16 1 1 P70
P.T.C ASSY (AIN10)
OPTION R-DOOR S/W RY2
E F C D DH1-Q,(ALE15B12)
R-LAMP
3 D6
H/BAR R-LAMP IN4004 15 2 2
P71
DOOR S/W
1 (AIN11)
R-LAMP
OPTION RY3

PIPE HEATER
CON2 (ALD112)

7
14 3 3 P72
(AIN12)
DISP' HEATER RY4
(ALE15B12)

5 D7
4
FUSE-MELTING IN4004 13 4

TOSHIBA TMP87C841N(IC1)
(72 °C) DEF-HEATER P73
(AIN13)
RY5
3 ALZ12B12

D8
1 IN4004 12 5 5 P74
(AIN14)

JP1
A B
RY6
11 (ALE15B12)
F-DOOR
SWITCH
CON3 D9
M 9 IN4004 11 6 6 P75
(AIN15)
AUGER MOTOR
F-LAMP RY7
(ALD112)

7
DISPENSER SOLENOID 10 7 7
LEVER S/W CUBE P76
RY8 8
(ALD112)
IC7*
5 9 KID65003AF
ICE 16 1 8
P77
RY9
(ALD112)

3
WATER 15 2 9
P00
RY10
(ALD112)

1
PILOT CR1 14 3 10
P01
SOLENOID RY11
VALVE CON4 (ALD112)

9
SOLENOID 0.1uF+120
/250VAC 13 4 11
DISPENSER P02

OPTION 7 RY12
G5SB-14

H/BAR-HEATER 5
12 5 12
P03

(OPTION1) RY14 (ALD112)

11 6 13
DISP-LAMP 3 P04
JP2
8
R12*
10K

R10(PRC) 1 4 R11 15
P06
56K/2W 100 CC7*
2 3 IC8 223
1 D10 D11 TLP762JF
IN4007 IN4148

+12V

IC7-1*
RY13 KID65003AF
A G5SB-14 R13
10 7 4.7K
14 P05

30
XIN
CSTS4.00MG03
R14*

OSC1
1M

XOUT
31

R IC9
4.7K
R15

1 3 29
RCR1 KIA7042 RESET
CC9*
180KJ +2.5 °C CC8* 2 104
104
56KJ +2 °C

33KJ +1.5 °C R16*

10K P60
18KJ +1 °C 56
(AIN0)
12KJ RCR1
+0.5 °C 10K
10KJ 0 °C 0
8.2KJ -0.5 °C S/W2
R24* R25*
4.7K 4.7K
5.6KJ -1 °C
2 16
P07
3.3KJ -1.5 °C
1 17
2KJ -2 °C P10

470J -2.5 °C
R73* R74* R75* R76*
4.7K 4.7K 4.7K 4.7K
8 CS
Vcc 1 P33
36
7 SK
NO 2
BR93LC46RF-W

P32
35
IC12*

CC30*
104 6 DI
NO 3 P31
34
5 4 DO
GND P30
33

Q6
A106M

37
R27 P34

1K
BUZZER R77*
220
CE16
+
R26
1K 47uF Q7
/25V C106M R78*
4.7K 51
P52

- 40 -
 Part 2
R28* OPTION
41 4.7K
P40
CC10*
SW1 CON9
223
A 6
HEATER,SHEET
(DUCT-DOOR)
CC11* IC13* 5
104 10 M54563FP

P11 (INT1)
18 2 19 D107
4 10

19 3 18 D108
P12
3 9
20 4 17
P13 D109
2 8
21 5 16
P14 D110
1 7

22 6 15
CON5 D111
P15
11
6

23 7 14 D112
P16
10 5
11
L101 L102 L103 L104 L105 L106
IC14*
KID65003AF
9

P17
24 2 15 R29
9
4
360,1/2W L107 L108 L109 L110 L111 L112

R19
4.7K
3 14 R30 3
TOSHIBA TMP87C841N(IC1)

25
P20 8
360,1/2W L113 L114 L116
L115 L117
(FILTER) (Light)
R20
27 4.7K 4 13 R31
P21
360,1/2W
7 2
8 D101 D102 D103 D104 D105 D106 1N4148X6

R21*
28 2K 12 5 R22* R23 SW101 SW102 SW103 SW104 SW105 SW106
P22
2K
6
CC31* 100
102 1
IC14-1*

RT1*
63 R32* 10KF
P67 4
(AIN7) CC12* 2K CE6
223 10uF RT-SENSOR
/50V
5
RW1
57 (OPTION2) R72* 26.1KF
P61
(AIN1) CC32* 2K 2
223
CE18
10uF WT-SENSOR
/50V
3
RF1
16.2KF
1
(R)J1
R33*
(R)J2 CON6
62
1
P66
(AIN6) CC13* 2K CE7 F-SENSOR
223 RD1 10uF 2
26.1KF /50V
61 R34*
P65 3
(AIN5) CC14*
2K CE8 D-SENSOR
223 R36
10uF 4
/50V
P47 48 R35 2K
5 A
CC15*
223
2K
6 B F-DOOR S/W
R40
Q2
330 KTB1151
D12
FR107 L3
R41 1mH
R37*
1.5K
4.7K 7
R38 1/2W
P54 53 3.9K CE9
C-FAN PWM Q3
D13
220uF
CC16*
FR107 223 3 4
R39 KTC3198 /25V
10K
8 1 C-FAN
R43
2
R42 4.7K
P51 50 2K
C-FAN LOCK 9
CC17*
102
OPTION
R47* Q4 D14
330 KTB1151
FR107
L4
R44* 1mH
4.7K R48
1.5K 12
R45 1/2W
P53 52 3.9K CE10
F-FAN PWM D15 CC18*
Q5 220uF
FR107 223
R46* KTC3198 /25V 3 4
10K
11 1 F-FAN
R49 R50 2
P50 4.7K
49 2K
F-FAN LOCK 10
CC19*
102

A CON7
1 DAMPER,HEATER
2 OPTION
F H/BAR-DOOR S/W
R52*
47 2K E
P46 R51
3 C
CC20* 2K
D
R-DOOR S/W
223
RR1*
4
58 R53* 26.1KF
P62
(AIN2) 2K
5 R1-SENSOR
CC21* CE11
223 RR2 10uF 6
R54* 26.1KF /50V
P63 59
7
(AIN3)
CC22* 2K CE12 R2-SENSOR
223 IC10 10uF 8
TA7774P /50V
9,16
15
9
A
CE13 1,2
1uF
+
/50V 14 A STEPPING
R55 R56 R57* 10
10K 10K 10K
P35
38 ST/OP 8
11 B MOTOR
B 6
11
39
P36
40 A 3 4,5,7, 10
12
B
P37 12,13

13

60 R58*
RIM1
16.2KF
CON8
P64
(AIN4) 1
CC23*
2K CE14 ICE MAKER SENSOR
223 10uF 2
/50V
R59
R60 2K
P44 45
2K
3 ICE MAKER
CC24*
223 4 STOP S/W
R61*
42 R62 4.7K
P41 5
CC25*
2K ICE MAKER
223 6 TEST S/W
2
R64*
46 R63* 2K 3 HALL 1
P45 7
2K
CC26* IC
223

8
7 8 + CE15
100uF
R65 R66
4.7K 4.7K /25V
43 Foward 5
P42 10
6
9
44 Reverse R67
P43 68,1/2W
ICE MAKER
4
IC11 CM4 M
BA6222
2
223/100V MOTOR
3
CC27*
223
10
CC28* 9 1
223
CC29
223

- 41 -
7. ICEMAKER AND DISPENSER WORKING PRICIPLES AND REPAIR

1. Working Principles

LSC27910**

→ →

- 42 -
2. Function of Icemaker

LSC27910** (Refer to appendix)

DIP SWITCH SETTING
No Water Supply Time
S1 S2
1 OFF OFF 6.5SEC
2 ON OFF 5.5SEC
3 OFF ON 7.5SEC
4 ON ON 8.5SEC
5
6
7
8

- 43 -
º

- 44 -
- 45 -
3. Icemaker Troubleshooting

- 46 -
LSC27910**

→ → →
→ → →

- 47 -
8. CIRCUIT

- 48 -
9. TROUBLE DIAGNOSIS
1. TroubleShooting
CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

1) No power at outlet. * Measuring instrument:

1. Faulty start
2) No power on cord. Multi tester
Bad connection between adapter and outlet. (faulty adapter) Check the voltage.
The Inner diameter of adapter. If the voltage is within ±85%
The distance between holes. of the rated voltage, it is OK.
The distance between terminals.
Check the terminal
The thickness of terminal.
movement.
Bad connection between plug and adapter (faulty plug).
The distance between pins.
Pin outer diameter.
3) Shorted start circuit.
No power on Disconnected copper wire. Power cord is disconnected. Check both terminals of
power cord. Faulty soldering. power cord.
Internal electrical short. Power conducts:OK.
No power conducts:NG
Faulty terminal contact. Loose contact.
- Large distance between
male terminal.
- Thin female terminal.
Terminal disconnected.
Bad sleeve assembly.

Disconnected. Weak connection.

Short inserted cord length.
Worn out tool blade.

COMBO is off. Capacity of COMBO is small.

Characteristics of COMBO is wrong.
Check rating of OLP
Bad connection. OLP: 4TM437NFBYY
Power is Temp. 120°C
Inner Ni-Cr wire blows out.
disconnected. If rating different: change it
Bad internal connection.
If not: OK
Faulty terminal caulking (Cu wire is cut).
Bad soldering.

No electric power on compressor. - Faulty compressor.

Faulty COMBO Power does not conduct. - Damage. Check the resistance of both
Characteristics of COMBO is wrong terminals.
Bad connection with Too loose. Take the combo off and
compressor. Assembly is not possible. install it again.
Bad terminal connection.
4) During defrost. Start automatic defrost.
Cycle was set at defrost when the refrigerator
was produced.

- 49 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

2. No cooling. 2) Refrigeration system is clogged. • Heat a clogged evaporator to

Moisture Residual moisture check it. As soon as the
Air Blowing. Not performed.
clogged. in the evaporator. cracking sound starts, the
Too short.
evaporator will begin to
Impossible moisture
freeze.
confirmation.
Low air pressure.
Leave it in the air. During rest time.
After work.
Caps are missed.

Residual moisture. Not dried in the compressor.

Elapsed more than 6 months after drying
Caps are missed.
No pressure when it is open.

No electric Insufficient drier Dry drier - Drier temperature.

power on capacity. Leave it in the air. Check on package
thermo- condition.
stat.
Good storage after
finishing.
Residual moisture Caps are missed. During transportation.
in pipes. During work.
Air blowing. Not performed.
Performed.
Too short time.
Low air pressure.
Less dry air.
Moisture penetration - Leave it in the air. - Moisture penetration.
into the refrigeration oil.
• The evaporator does not cool
Short pipe insert. from the beginning
Weld joint Pipe gaps. (no evidence of moisture
Too large.
clogged.
Damaged pipes. attached).
Too much solder. The evaporator is the same
as before even heat is
The capillary tube inserted depth. - Too much. applied.
Drier clogging.
Capillary tube melts. - Over heat.
Clogged with foreign materials. Desiccant powder.
Weld oxides.
Drier angle.
Reduced cross section by cutting. - Squeezed.

Compressor cap is disconnected.

Foreign material clogging. Foreign materials are in the pipe.

- 50 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration 1) Refrigerant Partly leaked. Weld joint leak.

is weak. Parts leak.

2) Poor defrosting capacity.

• Check visually.
Drain path (pipe) clogged. Inject adiabatics into drain Inject through the
hose. hole.
Seal with drain.

Foreign materials Adiabatics lump input.

penetration. Damage by a screw or
clamp.
Other foreign materials input.

Cap drain is not disconnected.

Defrost heater does not Parts Plate Wire is cut.

generate heat. disconnected. heater • Check terminal
- Heating wire.
Conduction: OK.
- Contact point
between heating No conduction: NG.
and electric wire. If wire is not cut, refer to
Dent by fin evaporator. resistance.
Poor terminal contacts. P=Power
V=Voltage
Wire is cut. R=Resistance
Cord
heater - Lead wire. V2
- Heating wire. P=
R
- Contact point
between heating and V2
electric wire. R=
P
Heating wire is corroded
- Water penetration.
Bad terminal connection.

- 51 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration
Residual Weak heat from heater. Sheath Heater - rated.
is weak. frost.
Heater plate No contact to drain.
Loosened stopper cord.
Heater cord-L Not touching the
evaporator pipe.
Location of assembly
(top and middle).

Too short defrosting time. Defrost Sensor.

- Faulty characteristics.
Seat-D (missing, location. thickness).

Structural fault. Gasket gap.

Air inflow through the fan motor.
Bad insulation of case door.

No automatic defrosting.

Defrost does not return.

3) Cooling air leak.

Bad gasket adhestion Gap.
Bad attachment.
Contraction.

Door sag. Bad adhesion.

Weak binding force at hinge.

4) No cooling air circulation. • Check the fan motor

Faulty fan motor. conduction: OK.
Fan motor. Self locked.
Wire is cut. No conduction: NG.
Bad terminal contact.

Door switch. Faults. Contact distance.

Button pressure.
Melted contact.
Contact.
Refrigerator and freezer switch reversed.
Button is not pressed. Poor door
attachment.
Door liner
(dimension).
Contraction inner
liner.
Misalignment.
Bad terminal
connection.
Adiabatics liquid
leak.

- 52 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

3. Refrigeration 4) No cooling air circulation.

is weak. Faulty fan motor. Fan is Fan shroud contact. - Clearance.
constrained. Damping evaporator contact.
Accumulated residual frost.

Small cooling air Insufficient Fan overload. - Fan misuse.

discharge. motor RPM Bad low termperature RPM characteristics.
Rated power misuse.
Low voltage.

Faulty fan. Fan misuse.

Bad shape.
Loose connection. - Not tightly connected.
Insert depth.

Shorud. Bent.
Ice and foreign materials on rotating parts.

5) Compressor capacity. Rating misuse.

Small capacity.
Low valtage.

6) Refrigerant Malfunction of charging cylinder.

too much or too little. Wrong setting of refrigerant.
Insufficient compressor. - Faulty compressor.

7) Continuous operation
- No contact of temperature controller. - Foreign materials. • Check visually after
disassembly.

8) Damper opens continuously.

Foreign materials Adiabatics liquid dump. • Check visually after
jammed. The EPS (styrofoam) drip tray has sediment in it. disassembly.
A screw or other foreign material has fallen into the drip
tray or damper.
Failed sensor. - Position of sensor.
Characteristics Bad characteristics of its own temperatue.
of damper. Parts misuse.
Charge of temperature - Impact.
characteristics.

9) Food storing place. - Near the outlet of cooling air.

- 53 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

4. Warm 1) Colgged cooling path.

refrigerator Adiabatics liquid leak.
compartment Foreign materials. –– Adiabatics dump liquid.
temperature.
2) Food storate. Store hot food.
Store too much at once.
Door open.
Packages block air flow.

5. No automatic 1) Faulty temperature sensor in freezer or refrigerator compartment. • Inspect parts measurements
operation. Faulty contact. and check visually.
(faulty Faulty temperature characteristics.
contacts) 2) Refrigeration load is too much. Food. Too much food.
Hot food.
Frequent opening and closing.
Cool air leak.
Poor door close. – Partly opens.
3) Poor insulation.
4) Bad radiation. High ambient temperature.
Space is secluded.

5) Refrigerant leak.
6) Inadequate of refrigerant.
7) Weak compressor discharging power. Different rating.
Small capacity.
8) Fan does not work.
9) Button is set at strong .

6. Condensation 1) Ice in freeezer compartment.

and ice External air inflow.–– Bushing installed incorrectly.
formation. Door opens Weak door closing power.
but not closes. Stopper malfunction.
Door sag.
Food hinders door closing.

Gap around gasket. –– Contraction, distortion, loose, door twisted, corner not
fully inserted.
Food vapor. –– Storing hot food. –– Unsealed food.
2) Condensation in the refrigerator compartment.
Door opens Insufficient closing.
but not closes. Door sag.
Food hinders door closing.
Gasket gap.
3) Condensation on liner foam.
Cool air leak Not fully filled. Top table part.
and transmitted. Out plate Ref/Lower part.
Flange gap. –– Not sealed.
Gasket gap.

- 54 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

6. Condensation 4) Condensation on door.

and ice Condensation on the duct door. - Duct door heater is cut.
formation. Condensation on the Recess Heater is cut.
dispense recess. Duct door is open. / Foreign material clogging.

Condensation on the Not fully filled. Surface.

Liquid shortage.
door surface. Cormer.
Liquid leak.
Adiabatics liquid contraction.

Condensation Bad wing adhesion. Wing sag(lower part).

on the gasket Door liner shape mismatch.
surface. Corner. Too much notch.
Broken.
Home Bar heater is cut.

5) Water on the floor.

Condensation in the refrigerator compartment.
Defrosted water overflows. Clogged discharging hose.
Discharging hose Evaporation tray located at wrong place.
location.
Tray drip. Damaged.
Breaks, holes.
Small Capacity.
Position of drain.

7. Sounds 1) Compressor compartment operating sounds.

Compressor sound Sound from machine itself.
inserted. Sound from vibration.
Restrainer.
Bushing Too hard.
seat. Distorted.
Aged.
Burnt.
Stopper. Bad Stopper Not fit
assembly. (inner
diameter
of stopper).
Tilted.
Not
Compressor base not connected.
Bad welding compressor stand(fallen).
Foreign materials in the compressor
compartment.

COMBO sound Chattering sound.

Insulation paper vibration.
Capacitor noise. Pipe contacts each other. .- Narrow interval.
Pipe sound. No vibration damper. Damping Bushing-Q.
Damping Bushing-S.
Capillary tube unattached.

- 55-
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
7. Sounds 1) Compressor compartment operating sounds.
Transformer sound. Its own fault. - Core gap.
Bad connection. - Correct screw connection.
Drip tray vibration sound. Bad assembly.
Distortion.
Foreign materials inside.
Back cover machine sound. Bad connection.
Partly damaged.
Condenser drain sound. Not connected.
Bad pipe caulking.
2) Freezer compartment sounds.
Fan motor sound. Normal operating sound.
Vibration sound. Aged rubber seat.
Bad torque for assembling motor
bracket.
Sounds from fan Fan guide contact.
contact. Shroud burr contact.
Damping evaporator contact.
Residual frost contact. Damaged heater cord.
Narrow evaporator interval.
Unbalance fan sounds. Unbalance. Surface machining conditions.
Fan distortion.
Misshappen.
Burr.

Ice on the fan. - Air intake (opposite to motor

bushing assembly.)

Motor shaft Supporter disorted.

contact sounds. Tilted during motor assembly.

Resonance.
Evaporator noise. Evaporator pipe contact. - No damping evaporator.
Sound from refrigerant. - Stainless steel pipe shape in
accumulator.
Sound from fin evaporator and pipe during expansion
and contraction.
3) Bowls and bottles make contact on top shelf.

4) Refrigerator roof contact.

5) Refrigerator side contact.

6) Insufficient lubricants on door hinge.

- 56 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK

8. Faulty lamp 1) Lamp problem. Filament blows out.

(freezer and Glass is broken.
refrigerator 2) Bad lamp assembly. Not inserted.
compartment). Loosened by vibration.
3) Bad lamp socket.
Disconnection. Bad soldering.
Bad rivet contact.
Short. Water penetration. Low water
level in tray.

Bad elasticity of contact.

Bad contact(corrosion).
4) Door switch. Defective.
Refrigerator and freezer switches are reversed.
Travlel distance.
Bad connection.
Bad terminal contact.
Adiabatics liquid leak..

9. Faulty internal 1) Lead wire is damaged. • Connect conduction and

voltage (short). Wire damage when assembling Bracket Cover. non-conduction parts and
Outlet burr in the bottom plate. check with tester.
Pressed by cord heater. lead wire, evaporator pipe. Conduction: NG.
2) Exposed terminal. Resistance° : OK.
Compressor Compartment terminal. - Touching other
components.
Freezer compartment terminal. - Touching evaporator pipe.
3) Faulty parts.
Transformer. Coil contacts cover.
Welded terminal parts contact cover.
Compressor. Bad coil insulation.
Plate heater.
Melting fuse. Sealing is broken. Moisture penetration.
Cord heater. Pipe damaged. Moisture penetration.
Bad sealing.
Sheath heater.

- 57 -
 CLAIMS. CAUSES AND CHECK POINTS. HOW TO CHECK
10. Structure, 1) Door foam.
appearance, Sag. Hinge loose Bolt is loosened during
and others. transportation.
Not tightly fastened.
Screw worn out .
Weak gasket Adhesion surface.
adhesion.
Fixed tape. Not well fixed.

Noise during Hinge interference. Bigger door foam.

operation. Hinge-Pin tilted-Poor flatness.
No washer.
No grease.

Malfunction. Not closed Interference between door liner and inner liner.
Refrigerator Stopper worn out.
compartment is Bad freezer compartment door
opened when freezer assembly.
compartment is No stopper.
closed (faulty stopper).

2) Odor.
Temperature of High. Faulty damper control.
refrigerator Button is set atweak.
compartment. Door is open (interference by
food).
Deodorizer. No deodorizer.
Poor capacity.

Food Storage. Seal condition.

Storage of fragrant foods.
Long term storage.
Others. Odors from cleaners or items which shroud not
be stored in a refrigerator.

- 58 -
 2. Faults

2-1. Power
Problems Causes Checks Measures Remarks

No power on - Power cord cut. - Check the voltage with tester. -Replace the components.
outlet. - Faulty connector insertion. - Check visually. -Reconnect the connecting parts.
- Faulty connection between plug - Check visually. -Reconnect the connecting parts.
and adapter.

Fuse blows out. - Short circuit by wrong connection. - Check the fuse with tester - Find and remove the cause of - Replace with rated
- Low voltage products are or visually. problem (ex. short, high voltage, fuse after confirming
connected to high voltage. - Check the input volt are with tester low voltage). its specification.
- Short circuit by insects. (between power cord and products). - Replace with rated fuse.
- Electricity leakage. - Check the resistance of power cord If fuse blowns out
- High voltage. with tester (if it is 0 , it is shorted). frequently, confirm
- Short circuit of components the cause and prevent.
(tracking due to moisture and dust
penetration).
- 59 -

2-2. Compressor

Problems Causes Checks Measures Remarks

Compressor - Faulty Combo. - Check the resistance. - If resistance is infinite, replace it

does not Vlaue: is defective. with new one.
operate. - If it is not infinite, it is normal.
- Check other parts.
- Compressor is frozen. - If compressor assembly parts are - During forced operation:
normal (capacitor, PTC, OLP), - Operates: Check other parts.
apply power directly to the - Not operate: Replace the frozen
compressor to force operation. compressor with new one, weld,
Auxiliary winding evacuate, and recharge refrigerant.
Main winding
Power

OLP It starts as soon as it is • Refer to weld repair procedures.

contacted.
 2-3. Temperature
Problems Causes Checks Measures Remarks

High Poor cool air circulation due to faulty - Lock –– Check resistance with a - Replace fan motor.
temperature fan motor. tester.
in the freezer 0 : short.
compartment. : cut. - Reconnect and reinsert.
- Rotate rotor manually and check
rotation.
- Wire is cut.
- Bad terminal contact: Check - Maintain clearance and remove ice
terminal visually. (Repair and/or replace shroud if fan
- Fan constraint. - Fan shroud is constrained by shroud
contact: Confirm deformation).
visually.
- Fan icing:
Confirm visually.
- 60 -

Faulty fan motor due to faulty door - Iced button (faulty) operation: - Confirm icing causes and repair.
switch operation. Press button to check - Replace door switch.
- Faulty button pressure and contact:
Press button to check operation.
- Door cannot press door switch - Door sag: fix door.
button: Check visually. - Door liner bent:replace door or
attach sheets.

Bad radiation conditions in - Check the clearance between the - Keep clearance between - The fan may be
compressor compartment. refrigerator and wall (50 mm in refrigerator and walls (minimum broken if cleaning
minimum). 50mm). performs while the
- Check dust on the grill in - Remove dust and contaminants refrigerator is on.
compressor compartment. from grill for easy heat radiation.
- Check dust on the condenser coils. - Remove the dust with vacuum
cleaner from the coils condenser
while the refrigerator is off.
 2-4. Cooling
Problems Causes Checks Measures Remarks

High Refrigerant leak. Check sequence Weld the leaking part, recharge the Drier must be replaced.
temperature 1. Check the welded parts of the refrigerant.
in the freezer drier inlet and outlet and drier
compartment. auxiliary in the compressor
compartment (high pressure side).
2. Check the end of compressor
sealing pipe (low pressure side).
3. Check silver soldered parts.
(Cu + Fe / Fe + Fe).
4. Check bending area of wire
condenser pipe in compressor
compartment (cracks can
happen during bending).
5. Check other parts (compressor
- 61 -

compartment and evaporators in

freezer compartment).

Shortage of refrigerant. Check frost formation on the surface - Find out the leaking area, repair, Drier must be replaced.
of evaporator in the freezer evacuate, and recharge the
compartment. refrigerant.
- If the frost forms evenly on the - No leaking, remove the remaining
surface, it is OK. refrigerant, and recharge new
- If it does not, it is not good. refrigerant.
 Problems Causes Checks Measures Remarks

High Cycle pipe is clogged. Check sequence. - Heat up compressor discharging Direr must be replaced.
temperature in 1. Check temperature of condenser weld joints with touch, disconnect
the freezer manually. the pipes, and check the clogging.
compartment. If it is warm, OK. Remove the causes of clogging,
If it is not, compressor discharging weld, evacuate, and recharge
joints might be clogged. the refrigerant.
2. Manually check whether hot line - If it's warm, OK. If it's not,
pipe is warm. condenser discharging line weld
If it is warm, OK. joints might be clogged.
If it is not, condenser outlet weld Disconnect with torch, remove the
joints might be colgged. causes, evacuate, and recharge
seal refrigerant.

Leak at loop pipe weld joint Check sequence. Replace the compressor, weld, Drier must be replaced.
- 62 -

(discharge) in compressor. 1. Manually check whether evacuate, and recharge refrigerant.

condenser is warm, It is not warm
and the frost forms partly on the
evaporator in the freezer
compartment.

Faulty cooling fan in the compressor Check sequence. - Replace if motor does not operate.
compartment. 1. Check cooling fan operation. - If fan is disconnected, check fan
2. Check that cooling fan is damage and reassemble it.
disconnected from the motor. Refer to fan motor disassembly
and assembly sequence.
 2-5. Defrosting failure
Problems Causes Checks Measures Remarks

No defrosting. Heater does not generate heat as 1. Check the resistance of heater. Heating wire is short and wire is cut. Seal the lead wire with
the heating wire is cut or the circuit 0 : Short. : Cut. • Parts replacement: Refer to parts insulation tape and heat
is shorted. Tens to thousands : OK. explanations. shrink tube if the cut
1) Heating wire is damaged when 2. Check the resistance between lead wire is accessible to
inserting into the evaporator. housing terminal and heater repair.
2) Lead wire of heater is cut. surface.
3) Heating wire at lead wire contacts 0 : Short. : Cut.
is cut. Tens to thousands : Short.
Suction tube and discharge orifice: 1. Confirm foreign materials. In case 1) Push out impurities by inserting
1. Impurities. of ice, insert the copper line copper wire. (Turn off more than
2. Ice. through the hole to check. 3 hours and pour in hot water if
2. Put hot water into the drain frost is severe.)
(check drains outside). 2) Put in hot water to melt down frost.
3) Check the water outlet.
4) Push the heater plate to suction
- 63 -

duct manually and assemble the

disconnected parts.
Gap between Suction duct and 1. Confirm in the Suction duct. 1) Turn off the power, confirm
Heater plate (Ice in the gap). impurities and ice in the gap, and
supply hot water until the ice in the
gap melts down.
2) Push the Heater plate to drain
bottom with hand and assemble
the disconnected parts.
Wrong heater rating (or wrong 1. Check heater label. Faults:replace.
assembly). 2. Confirm the capacity after - How to replace :
substituting the resistance value Refer to main parts.
into the formula.
V2 (V: Rated voltage of user country)
P=
R (R: Resistance of tester[Ω])
Compare P and lavel capacity.
Tolerance: ±7%
 Problems Causes Checks Measures Remarks

No defrosting Melting fuse blows. - Check melting fuse with tester. - Faullty parts: parts replacement.
1) Lead wire is cut. If 0 : OK. - Check wire color when maeasuring
2) Bad soldering. If : wire is cut. resistance with a tester.
Ice in the Suction duct. 1. Check the inner duct with mirror. 1) Turn power off.
1) Icing by foreign materials in the 2) Raise the front side (door side),
duct. support the front side legs, and let
2) Icing by cool air inflow through the ice melt naturally. (If power is
the gap of heater plate. on, melt the frost by forced
3) Icing by the gap of heater plate. defrosting.)
2. Check by inserting soft copper 3) Reassemble the heater plate.
wire into the duct (soft and thin
copper not to impair heating wire).
Bad cool air inflow and discharge, 1. Turn on power, open or close the 1) Check the faulty connector of
and bad defrosting due to faulty door, check that motor fan housing and reassemble wrongly
contact and insertion (bad connector operates (If it operates, motor fan assembled parts.
- 64 -

insertion into housing of heater, is OK). 2) If the parts are damaged,

melting, fuse, and motor fan). 2. Disconnect parts in the refrigerator remove the parts and replace it
compartment, check the connection with a new one.
around the housing visually,
defrost, and confirm heat generation
on the heater. Do not put hands on
the sheath heater.
3. Check the parts which have faults
described in 1 & 2 (mechanical
model: disconnect thermostat
from the assembly).
 2-6. Icing
Problems Causes Checks Measures Remarks

Icing in the 1) Bad circulation of cool air. - Check the food is stored properly - Be acquainted with how to use. - Check the defrost
refrigerator - Clogged intake port in the (check discharge and intake port - Sealing on connecting parts. related parts if problem
compartment. refrigerator compartment. are clogged). - Check the damper and replace is caused by faulty
- Damper icing. - Sealing is not good. - Check icing on the surface of it if it has defects. defrosting.
- Pipe icing. - Too much food is stored and clogs baffle and cool air path (pipe) after - Check defrost. (After forced
- Discharging the discharge port. dissembling the container box. defrosting, check ice in the
pipe icing. - Bad defrosting. - Check icing at intake ports of evaporator and pipes.)
freezer and refrigerator
compartment.
2) Faulty door or refrigerator - Check gasket attached conditions. - Correct the gasket attachment - Replacement should
compartment. - Check door assembly conditions. conditions and replace it. be done when it
- Faulty gasket. - Door assembly and replacement. cannot be repaired.
- Faulty assembly.
3) Overcooling in the refrigerator - Check refrigerator compartment - Replace faulty parts.
compartment. is overcooled (when button
- 65 -

- Faulty damper in the refrigerator pressed on weak ).

compartment. - Check parts are faulty.
- Faulty MICOM (faulty sensor)
4) Bad defrosting - Check frost on the evaporator - Check parts related to defrosting. - Moisture does not freeze
- Heater wire is cut. after dissembling shroud and fan - Check defrosting. (Check ice on the on the evaporator but
- Defective defrost sensor. grille. evaporator and pipe.) can be sucked into the
- Defrosing cycle. - Check ice on intake port of freezer refrigerator, where it
and refrigerator compartment. condenses and freezes.
This interferes with cold
air circulation and
sublimation of the ice.
5) Customers are not familiar with - Check food interferes with door - Be acquainted with how to use.
this machine. closing.
- Door opens. - Check ice on the ceilings.
- High temperature, high moisture,
and high load.
 Problem Cause Check Measure Remarks

Ice in the freezer 1) Bad cooling air circulation. - Check food storage conditions - Be acquainted with how to use. - Check the parts related
compartment. - Intake port is clogged in the freezer visually.(Check clogging at intake - Check defrost (Check ice on the to defrosting if the
- Surface of fan compartment. and discharging port of cooling air.) evaporator and pipes after forced problem is caused by
grille. - Discharging port is Clogged. - Check food occupation ratio in defrosting). the faulty defrosting.
- Wall of freezer - Too much food is stored. volume (Less than 75%).
compartment. - Bad defrosting. - Check frost on the evaporator after
- Cool air dissembling shroud and fan grille.
discharging port. - Check icing at intake port of
- Basket(rack) refrigerator compartment.
area.
- Food surface. 2) Bad freezer compartment door - Check gasket attachment - Correct the gasket attachement - Replace when it can not
- Icing in the - Faulty gasket conditions. conditions and replace it. be repaired.
shute. - Faulty assembly - Check door assembly conditions. - Door assembly and replacement.

3) Over freezing in the freezer - Refrigerator operates pull down. -Replace defective parts.
compartment. (Check if it is operated
- 66 -

- Faulty MICOM. intermittently)

- The Temperature of freezer
compartment is satisfactory, but
over freezing happens in the
refrigerator compartment even
though the notch is set at weak.

4) Bad defrosting. - Check frost on the evaporator after - Check parts related to defrosting.
- Heater wire is cut. dissembling shroud and grille. - Check defrosting. Check ice on the
- Faulty defrost sensor. - Check ice on the intake port in the evaporator and pipes after forced
- Defrosting cycle refrigerator compartment. defrosting.

5) User is not familiar with how to - Check food holds door open. - Be acquainted with how to use.
use. - Check ice on the ice tray.
- Door opens.
- High moisture food water is stored.
 2-7. Sound

Problems Causes Checks Measures Remarks

Hiss sound 1. Loud sound of compressor 1.1 Check the level of the 1) Maintain horizontal level.
operation. refrigerator. 2) Replace bushing and seat if they
1.2 Check the bushing seat are sagged and aged.
conditions (sagging and aging). 3) Touch the piping at various place
along its route. Install a damper at
2. Pipes resonate sound which is 2.1 Check the level of pipes the point where your tuch reduces
connected to the compressor. connected to the compressor the noise.
and their interference. 4) Avoid pipe interference.
2.2 Check bushing inserting 5) Replace defective fan and fan
conditions in pipes. motor.
2.3 Touch pipes with hands or screw 6) Adjust fan to be in the center of
-driver (check the change of the fan guide.
sound). 7) Leave a clearance between
interfering parts and seal gaps in
- 67 -

3. Fan operation sound in the freezer 3.1 Check fan insertion depth and the structures.
compartment. blade damage. 8) Reassemble the parts which make
3.2 Check the interference with sound.
structures. 9) Leave a clearance if evaporator
3.3 Check fan motor. pipes and suction pipe touch
3.4 Check fan motor bushing freezer shroud.
insertion and aging conditions.

4. Fan operation sound in the 4.1 Same as fan confirmation in the

compressor compartment. refrigerator.
4.2 Check drip tray leg insertion.
4.3 Check the screw fastening
conditions at condenser and
drip tray.
 Problems Causes Checks Measures Remarks

Vibration sound. 1. Vibration of shelves and foods in 1-1. Remove and replace the 1) Reassemble the vibrating parts
Clack. the refrigerator. shelves in the refrigerator and insert foam or cushion where
2. Pipes interference and capillary 1-2. Check light food and container vibration is severe.
tube touching in the compressor. on the shelves. 2) Leave a clearance where parts
compartment. 2-1. Touch pipes in the compressor interfere with each other.
3. Compressor stopper vibration. compartment with hands. 3) Reduce vibration with bushing
4. Moving wheel vibration. 2-2. Check capillary tube touches and restrainer if it is severe.
5. Other structure and parts cover back. (especially compressor and pipe).
vibration. 3-1. Check compressor stopper 4) Replace compressor stopper if it
Vibration. vibrates severely.
4-1. Check vibration of front and rear
moving wheels.
5-1. Touch other structures and parts.
- 68 -

Irregular sound. 1. It is caused by heat expansion 1-1 Check time and place of sound 1) Explain the principles of refrigeration
Click . and contraction of evaporator, sources. and that the temperature difference
shelves, and pipes in the between operation and defrosting
refrigerator. can make sounds.
2) If evaporator pipe contacts with other
structures, leave a clearance between
them (freezer shroud or inner case).
 Problems Causes Checks Measures Remarks

Sound Popping It happens when refrigerant expands - Check the sound of refrigerant at the - Check the restrainer attached on the
(almost the same at the end of capillary tube. initial installation. evaporator and capillary tube weld
as animals crying - Check the sound when the refrigerator joints and attach another restrainer.
sound). starts operation after forced defrosting. - If it is continuous and servere, insert
- Check the restrainer attachment capillary tube again (depth 15±3mm)
conditions on the evaporator and - Fasten the capillary tube to suction
capillary tube weld joints. pipes or detach in the compressor
compartment.
- Explain the principles of freezing
cycles.

Water boiling or It happens when refrigerant passes - Check the sound when compressor is - Explain the principles of freezing cycles
flowing sound. orifice in accumulator internal pipes by turned on. and refrigerant flowing phenomenon by
the pressure difference between - Check the sound when compressor is internal pressure difference.
- 69 -

condenser and evaporator. turned off. - If sound is servere, wrap the

accumulator with foam and restrainer.

Sound of whistle When door closes, the internal pressure - Check the sound by opening and - Broaden the cap of discharge hose for
when door of the refrigerator decreases sharply closing the refrigerator or freezer doors. defrosting in the compressor
closes. below atomosphere and sucks air into compartment.
the refrigerator, making the whistle - Seal the gap with sealant between out
sound. and inner cases of hinge in door.
 2-8. Odor
Problems Causes Checks Measures Remarks

Food Odor. Food (garlic, kimchi, etc) - Check the food is not wrapped. - Dry the deodorizer in a sunny place
- Check the shelves or inner with adequate ventilation.
wall are stained with food juice. - Store the food in the closed
- Be sure food is securely covered container instead of vinyl wraps.
with plastic wrap. - Clean the refrigerator and set
- Chedk food cleanliness. button at strong.

Plastic Odor. Odors of mixed food and plastic - Check wet food is wrapped with - Clean the refrigerator.
odors. plastic bowl and bag. - Persuade customers not to use
- It happens in the new refrigerator. plastic bag or wraps with wet food
or odorous foods.
- 70 -

Odor from the Odor from the old deodorizer. - Check the deodorizer odors. - Dry the deodorizer with dryer and *Deodorizer : option
deodorizer. then in the shiny and windy place.
- Remove and replace the
deodorants.
 2-9. Micom
Problems Symptom Causes Checks Measures Remarks

Bad PCB All display Bad connection Bad connector Visual check on connector Reconnect
electric power. LCD are off. between Main PCB connection from main connection. connector.
and display circuit. PCB to display PCB.

Defective PCB PCB transformer Check resistance of PCB Replace PCB Applicable to
transformer. winding is cut. transformer input and output transformer or PCB. model without
PCB transformer terminals with a tester. dispenser.
temperature fuse is (If resistance is infinity, trans
burnt out. winding is cut).

DefectivePCB electric Defective regulator IC Check voltage at input/output Replace regulator. Refer to electric
circuit parts. (7812, 7805). terminals. circuit in circuit
explanation.
PCB electric terminal Check fuse in PCB electric Replace PCB fuse.
fuse is burnt out. terminal with a tester.
- 71 -

STR Parts are Check if STR No. 2 and 3 pins Replace parts. Applicable to
damaged. are cut when power is off. model with
dispenser.

Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead
display LCD between Main PCB main PCB and display connecting Main PCB and Wire and directly
operation and display circuit. PCB is cut or connector display PCB with a tester. connect defective
terminal connection is contact terminal to
bad. Lead Wire.

Defective LCD. Defective LCD. Check if all LCD are on when Replace display Refer to display
Main PCB Test switch is PCB. circuit in circuit
pressed (or when both freezer explanation.
key and power freezer key are
pressed at the same time for
more than one second.)
 Problems Symptom Causes Checks Measures Remarks

Bad cooling. Freezer Compressor does Compressor Lead Wire Check compressor Lead Wire Reconnect Lead
temperature is not start. is cut. with a tester. Wire.
high. Defective compressor Measure voltage at PCB CON2 Replace relay RY1 Refer to load
driving relay. (3&9) after pressing main PCB and RY2 or PCB. driving circuit in
test switch once. It is OK if circuit
voltage is normal. explanation.

Defective freezer Defective Freezer Check resistance of freezer Replace freezer Refer to
sensor. sensor parts. sensor with a tester. sensor. resistance
characteristics
table of sensor in
circuit. Refer to
tables to page 29

The wrong sensor Confirm the color of sensor in Repair main PCB explanation.
has been installed. circuits (main PCB sensor sensor housing
- 72 -

Order by model number housing).

and part number.

Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead
motor. is cut. with a tester. wire.
• Defective door switch Measure the voltage between • Replace door Refer to load
(freezer, refrigerator, PCB power blue line and fan switch (freezer, driving circuits in
home bar). motor after pressing test switch refrigerator, and circuit
• Defective fan motor. of Main PCB. If the voltage is home bar). explanation.
• Defective fan motor normal, it is OK. • Replace fan motor.
driving relay. • Replace relay RY5
& RY6 or PCB.

Faulty defrost. Refer to faulty defrost items in trouble diagnosis Refer to trouble
functions. diagnosis
function.
 Problem Symptom Cause Check Measure Remarks

Bad cooling Wrong Defective Step Motor Check Step Motor Check if Step Motor damper Reconnect lead
Refrigerator Damper. damper motor and motor and reed switch lead wire.
temperature. reed switch and lead wire are cut with a tester.
wire are cut. Check Refer to Step Motor damper Replace Step Motor
Step Motor damper in parts repair guide. damper or refrigerator
part. control box Assembly.
Check Step Motor Refer to Step Motor damper Replace relay or Refer to single
damper Motor driving in parts repair guide. PCB. motor damper
relay in PCB. driving circuits
in circuit
explanation.
Foreign materials in Step Check Step Motor damper Remove foreign
Motor damper baffles. baffle visually. materials.
Ice formation on Check if Step Motor damper Replace Step Motor
Step Motor damper Heater wire is cut with a damper or refrigerator
- 73 -

baffles. tester. control Box Assembly.

Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor
sensor sensor parts. refrigerator sensor with a tester. sensor. resistance
characteristic
table in circuit
explanation.
Refrigerator sensor is Check the sensor color in the Repair main PCB
substituted for other circuit. (main PCB sensor sensor housing.
sensor. housing.)
Defective refrigerator Check if refrigerator sensor Fix again the
sensor assembly is not fixed at cover sensor but refrigerator sensor.
condition. inner case visually.
 Problems Symptom Causes Checks Measures Remarks

Bad defrost. Defrost is not Defrost lead wire is cut. Check if defrost lead wire is cut with a Reconnect Lead
working. tester. Wire.

Defective defrost driving relay. Check the voltage of CON2 (1 and 7) Replace relay (RY 7 Refer to load
with a tester after pressing main and RY 3) or PCB. driving conditions
PCB test switch twice. check in circuit
If the voltage is normal then it is OK. explanation.

Defective defrost sensor parts. Check the resistance of defrost sensor Replace defrost Refer to sensor
with a tester. sensor. resistance
characteristic
table of circuit
explanation.

Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire.
buzzer continuously main PCB to door switch. switch with a tester.
- 74 -

rings or door Defective door switch parts. Refer to door switch in parts repair Replace door switch.
opening alarm guide.
does not work.

Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester. Reconnect lead Refer to display
display button not sound terminal contact in main PCB and wire and replace or circuit in circuit
and buttons display PCB connecting lead wire. directly connect bad explanation.
do not contact terminal to
operate. lead wire.

Key is continuously depressed due to Disassemble frame display and confirm Adjust or replace
structural interference. visually. interfering
structures.
 Problems Symptom Causes Checks Measures Remarks

Defective Buzzer does Trouble mode indication. Check trouble diagnosis function. Repair troubles Refer to mode
display button. not sound indication in
and buttons function
do not operate. explanations.

Door Buzzer Buzzer Defective connecting lead wire from Check lead wire associated with door Repair lead wire. Check model
continuously main PCB to door switch. switch. with dispenser.
rings or door Defective freezer compartment door Refer to door switch in parts repair Replace Freezer
opening alarm switch parts. guide. compartment door
does not work. switch.

Bad water/ice Ice and water Defective connecting lead wire from Check Lead Wire associated with lever Repair lead wire.
dispenser. are not Main PCB to lever switch. switch with a tester.
dispensed. Defective lever switch parts Refer to door switch in parts repair guide. Replace lever switch.
Defective photo coupler IC parts. Check voltage change at photo coupler Replace photo
- 75 -

output terminals with lever switch coupler IC or PCB.

pressed. It is OK if voltage change is
between 0V - 5V.
Defective relay associated with ice Check relay (RY4, RY5, RY12) Replace defective
dispense (geared motor, cube, and with a tester. relay.
dispenser solenoid).
Defective parts associated with ice Check resistance of parts with a tester. Replace defective
dispense (geared motor, cube, and parts.
dispenser solenoid).
Defective relay associated with water Check relay (RY7) with a tester Replace defective
dispense. relay.
Defective parts associated with water Check resistance of parts with a tester. Replace defective
dispenser. parts.
3. Sealed System Heavy Repair

3-1. The Heavy Repair Standards for Refrigerator with R134a Refrigerant

No. Items Unit Standards Purposes Remarks

The opening time should be reduced to a half of
Pipe: Within 1 hour
Pipe and piping system the standards during rain and rainy seasons
1 Min Comp: Within 10 min To protect moisture penetration
opening time (the penetration of water into the pipe is
Drier: Within 20 min
dangerous).
Refer to repair note in each part.
Weld under nitrogen R134a refrigerant is more susceptible to leaks
Nitrogen atmospher (N2 than R12 and requires more care during
2 Welding To protect oxide scale formation
Pressure pressure 0.1~ 0.2 welding.
kg/cm2) Do not apply force to pipes before and after
welding to protect pipe from cracking.
Sounds while removing
In case of evaporator parts, if it does not make
bushing cap. Sound:
3 N2 Sealed parts Leak To protect moisture penetration noise when removing bushing cap blow dry air
usable No sound:Not
or N2 gas for more than 1 min use the parts.
usable
Refrigeration cycle
Evacuation time Min. More than 40 min To remove moisture
Only applicable to the model equipped with
Vacuum degree Torr Below 0.5 (ref)
reverse flow protect plate.
High and low pressure
side evacuates at the Vacuum eficiency can be improved by operating
Vacuum EA
same time for models compressor during evacuation
above 200 l
The bushing pipes for R12 refrigerant shall be
Use R134a exclusive To protect mixing or mineral and
Vacuum piping EA melted when they are used for R134a refrigerant
manifold ester oils
causes of leak.
Use R134a exclusive
Pipe couple EA To protect R12 Refrigerant mixing
manifold
Outlet (Socket) R134 exclusive
Plug R134 exclusive

Do not weigh the refrigerant at too hot or too

Use R134a exclusived cold an areas (25°C (77°F) is adeqate)
weighing allownce ±5g.
5 Refrigerant weighing EA Do not mix with R12 refrigerant
Note: Winter: ±5g.
Summer: ±5g Use copper charging canister
Socket. 2SV Plug: 2PV R134a
Note: Do not burn O-ring (rubber) during
welding
Use R134a exclusive
and remove for R134a
refrigerant moisture
6 Drier replacement
Replace drier whenever
from pipe repairing
refrigerator cycle
piping.
Check oil leak at refrigerant leak area.
Use electronic leak detector if oil leak is not
Do not use soapy water found
7 Leak check for check. It may be Detect refrigerant leak area The electronic leak detector is very sensitive to
sucked into the pipe. halogen gas in there. It also can detect R141b
in urethane. Please practice therefore many
times before use.

- 76 -
 Process Contents Tools

Trouble
diagnosis

Remove refrigerant - Cut charging pipe ends and discharge refrigerant from Filter, side cutters
Residuals
drier and compressor.

- Use R134a oil and refrigerant for compressor and drier Pipe Cutter, Gas welder, N 2 gas

Parts - Confirm N2 sealing and packing conditions before use.

replacement Use good one for welding and assembly.
and welding - Weld under nitrogen gas atmosphere. (N2 gas pressure:
0.1-0.2kg/cm2).
- Repair in a clean and dry place.

- Evacuate for more than forty minutes after connecting Vacuum pump R134a
manifold gauge hose and vacuum pump to high (drier) exclusively, Manifold gauge.
Vacuum and low (compressor refrigerant discharging parts)
pressure sides.
- Evacuation Speed:113 liters/minute.

Refrigerant - Weigh and control the allowance of R134a charging R134a exclusive charging canister
charging and canister in a vacuum conditions to be ±5 g with (mass cylinder), refrigerant
charging electronic scales and charge through compressor inlet R134a manifold gauge,
inlet welding (Charge while compressor operates). electronic scales, pinch-off
- Weld carefully after pinching off the inlet pipe. plier, gas welding machine

- Check leak at weld joints. Electronic Leak Detector,

Minute leak : Use electronic leak detector Driver (Ruler).

Check Big leak : Check visually.

refrigerant leak Note:Do not use soapy water for check.
and cooling - Check cooling capacity
capacity
1. Check radiator manually to see if warm.
2. Check hot line pipe manually to see if warm.
3. Check frost formation on the whole surface of the
evaporator.

Compressor - Remove flux from the silver weld joints with soft brush Copper brush, Rag, Tool box
compartment or wet rag. Flux may be the cause of corrosion and
and tools leaks.
arrangement - Clean R134a exclusive tools and store them in a clean
tool box or in their place.

- Installation should be conducted in accordance with the

Transportation
and standard installation procedure. Leave space of more
installation than 5 cm (2 inches) from the wall for compressor
compartment cooling fan mounted model.

- 77 -
3-3. Precautions During Heavy Repair
Items Precautions

1. Use of tools. 1) Use special parts and tools for R134a.

2. Recovery of refrigerant. 1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.
2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate
recovery equipment to recover the refrigerant from the system. When the refrigerant has
been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT
TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.
The use of piercing type valves will allow future servicing and eliminates the possibility of a
defective pinch off.

Evaporator

Hot Line
Compressor
Drier

2
Low pressure side Condenser
1 High pressure side

3. Replacement of drier. 1) Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant.

4. Nitrogen blowing 1) Use pressurized nitrogen to prevent oxidation inside the piping.
welding. (Nitrogen pressure : 0.1~0.2 kg/cm2.)

5. Others. 1) Only nitrogen or R134a should be used when cleaning the inside of piping of the sealed
system.
2) Check leakage with an electronic leakage tester.
3) Be sure to use a pipe cutter when cutting pipes.
4) Be careful not the water let intrude into the inside of the cycle.

- 78 -
3-4. Practical Work For Heavy Repair
Items Precautions

1. Removal of residual Evaporator

Low pressure side
refrigerant.
Hot Line KEY POINT
Compressor Observe the sequence for
Drier removal of refrigerant.
Suction (If not, compressor oil may
leak.)
Release Condenser High pressure side
Refrigent
Intake

1) Continue to recover the refrigerant for more than 5 minutes after turning the refrigerator off.
2) Install a piercing type valve on the high pressure line (drier side). Then use the appropriate
recovery equipment to recover the refrigerant from the system. When the refrigerant has
been recovered, install a piercing type valve on the low pressure side. IT IS IMPORTANT
TO OPEN THE SYSTEM IN THIS ORDER TO KEEP THE OIL FROM BEING FORCED OUT.
The use of piercing type valves will allow future servicing and eliminates the possibility of a
defective pinch off.

2. Nitrogen blowing Evaporator

welding.
KEY POINT
Hot Line Welding without nitrogen
1 2 1 blowing produces oxidized
Drier scales inside a pipe, which
affect performance and
High pressure side reliability of a product.
Refrigent 2 Condenser
Intake

When replacing a drier:

Weld 1 And 2 parts by blowing nitrogen (0.1~0.2kg/cm2) to high pressure side after
assembling a drier.
When replacing a compressor:
Weld 1 And 2 parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because it does not produce oxidized
scales inside pipe because of its short welding time.

3. Replacement of drier.
KEY POINT
Be sure to check the
inserted length of capillary
tube when it is inserted.
(If inserted too far, the
0.748 ± 0.04 capillary tube will be
blocked by the filter.)

Inserting a capillary tube

Measure distance with a ruler and put a mark(0.748 ± 0.04)on the capillary tube. Insert tube to the
mark and weld it

- 79 -
 Items Precautions

4. Vacuum degassing. Evaporator

Suction pipe

Hot Line
Compressor
Drier

Condenser
3

2 1

Low
pressure High
Blue pressure
Yellow
Red

KEY POINT
Vaccum - If power is applied
Pump during vacuum
degassing, vacuum
degassing shall be
more effective.
Pipe Connection
- Run the compressor
Connect the red hose to the high pressure side and the blue hose to the while charging the
low pressure side. system. It is easier
and works better.
Vacuum Sequence
Open valves 1 and 2 and evacuate for 40 minutes. Close valve 1 .

5. Refrigerant charging.
Charging sequence
1) Check the amount of refrigerant supplied to each model after completing vacuum
degassing.
2) Evacuate charging canister with a vacuum pump.
3) Measure the amount of refrigerant charged.
- Measure the weight of an evacuated charging canister with an electronic scale.
- Charge refrigerant into a charging canister and measure the weight. Calculate the weight
of refrigerant charged into the charging canister by subtracting the weight of an
evacuated charging canister. KEY POINT
Indicate the weight of an - Be sure to charge the
evacuated charging canister refrigerant at around
25°C [77°F].
R134a
- Be sure to keep -5g in
the winer and +5g in
summer.

Calculation of amount of refrigerant charged

the amount of refrigerant charged= weight after charging -
weight before charging (weight of an evacuated cylinder)

- 80 -
 Items Precautions

Evaporator

Hot Line
Compressor
Drier

Condenser

Charging Canister
4) Refrigerant Charging
Charge refrigerant while operating a compressor as shown above.
5) Pinch the charging pipe with a pinch-off plier after completion of charging.
6) Braze the end of a pinched charging pipe with copper brazer and take a gas leakage test
on the welded parts.

6. Gas-leakage test * Test for leaks on the welded or suspicious area with an electronic leakage tester.

7. Pipe arrangement When replacing components, be sure

in each cycle each pipe is replaced in its original
position before closing the cover of the
mechanical area. Bushing

3-5. Standard Regulations For Heavy Repair

1) Observe the safety precautions for gas handling.

2) Use JIG (or a wet towel) in order to prevent electric wires from burning during welding. (In order to prevent insulation
break and accident.)
3) The inner case will melt and the insulation will burn.
4) The copper piping will oxidize.
5) Do not allow aluminum and copper pipes to touch. (In order to prevent corrosion.)
6) Observe that the inserted length of a capillary tube into a drier should be 0.748 ± 0.04

0.748 ± 0.04

7) Make sure that the inner diameter is not distorted while cutting a capillary tube.
8) Be sure that the suction pipe and the filling tube should not be substituted each other during welding. (High efficiency
pump.)

- 81 -
 Pipe Assembly, Hot Line
(Freezer)

Cooper Brazing
Copper Brazing

Silver Brazing

Capi-tube Drier assembly

Silver Brazing
Pipe assembly, suction Pipe Assembly, Joint
Copper
Brazing

Pipe assembly, Condenser Assembly, wire

joint
Copper Brazing Silver Brazing
Copper Brazing Copper Brazing

- 82 -
4-1. Sound

Problems Checks and Measures

Hiss sounds Explain general principles of sounds.
• All refrigerators make noises when they run.
The compressor and fan produce sounds.
There is a fan in the freezer compartment which blows cool air to freezer and
refrigerator compartments. Hiss sounds are heard when the air passes through
the narrow holes into the freezer and refrigerator compartments.
Cooling Fan sound in the compressor compartment.
• There is a fan on the back of the refrigerator which cools the compressor
compartment. If there is a small space between the refrigerator and the wall, the
air circulation sounds may be noticeable.
Noise of Compressor.
• This operating sound happens when the compressor compresses the
refrigerant. The compressor rotates at 3600 RPM. The sound of compressor
Bigger refrigerators make more noise than small ones

Click sounds Explain the principles of temperature change.

• The sounds happens when pipes and internal evaporator in the refrigerator
compartment expand and contract as the temperature changes during the
refrigerator operation. This sound also happens during defrosting, twice a day,
when the ice on the evaporator melts.

Clunk sound Explain that it comes from the compressor when the refrigerator starts.
• When the refrigerator operates, the piston and motor in the compressor rotate
at 3600 RPM. This sound is caused by the vibration of motor and piston when
they start and finish their operation. This phenomenon can be compared with
that of cars. When an automobile engine starts, it is loud at first but quiets
down quickly. When the engine stops, so does the vibration.

Vibration sound Check the sound whether it comes from the pipes vibration and friction.
• Insert bushing or leave a space between pipes to avoid the noise.
• Fix the fan blade if it is hitting on the shroud
• Fix the drip tray if it is loosened.
Sound depends on the installation location.
• Sound becomes louder if the refrigerator is installed on a wooden floor or near
a wooden wall. Move it to the another location.
• If the refrigerator is not leveled properly, a small vibration can make a loud
sound. Please adjust the level of the refrigerator.

- 83 -
 Problems Checks and Measures

Sounds of water flowing Explain the flow of refrigerant.

• When the refrigerator stops, the water flowing sound happens.
This sound happens when the liquid or vapor refrigerant flows from the
evaporator to compressor.

Click sounds Explain the characteristics of moving parts.

• This noise comes from the MICOM controller's switch on the top of the
refrigerator when it is turned on and off.

Noise of Icemaker operation Explain the procedure and principles of Icemaker operation.
(applicable to model with Icemaker). • Automatic Icemaker repeats the cycle of water supplying Icemaking ice
- Noise produced by ice dropping ejection. When water is supplied, the water supply valve in the machine room
and hitting ice bin. makes sounds like Hiss and water flowing also makes sound. When water
- Noise from motor sounds Hiss . freezes, clicking sounds are heard. When ice is being ejected, sounds like Hiss
produced by a motor to rotate an ice tray and ice dropping and hitting ice bin
sounds are also heard.

Noise when supplying water. Explain the principles of water supplied to dispenser.
• When the water supply button in the dispenser is pressed, the water supply
valve in the compressor compartment opens and let the water flow to the water
tank in the lower part of the refrigerator compartment. The water is dispensed
by this pressure. When this happens, motor sound and water flowing sound are
heard.

Noise when supplying ice. Explain the principles of ice supply and procedure of crushed icemaking in a
dispenser.
• When ice cube button is pressed, ice stored in the ice bin is moved by an auger
and dispensed. If crushed ice button is pressed, the ice cube is crushed.
When this happens, ice crushing and hitting ice bin sounds are heard.

- 84 -
4-2. Measures for Symptoms on Temperature

Problems Checks and Measures

Refrigeration is weak. Check temperature set in the temperature control knob.

• Refrigerator is generally delivered with the button set at normal use (MID).
But customer can adjust the temperature set depending on their habit and taste.
If you feel the refrigeration is weak, then set the temperature control button at
strong position. If you adjust the button in the freezer compartment as well,
the refrigeration is stronger than adjusting refrigerator only.

The food in the chilled drawer is . The chilled drawer does not freeze food.
not frozen but defrosted • Use chilled drawer for storing fresh meat or fish for short periods. For storing for
a long periods or freezing food, use a freezer compartment. It is normal that
frozen foods thaw above the freezing temperature (in the chilled drawer).

Refrigerator water is not cool. Check the water storage location.

• If water is kept in the door rack, move it to a refrigerator shelf. It will then
become cooler.

Ice cream softens. Explain the characteristics of ice cream.

• The freezing point of ice cream is below -15°C[5°F]. Therefore ice cream may
melt if it is stored in the door rack.
• Store ice cream in a cold place or set the temperature control button of a freezer
at strong position.

Refrigeration is too strong. Check the position of temperature control button.

• Check if refrigeration is strong in whole area of the refrigerator or partly near the
outlet of the cooling air. If it is strong in whole area, set the control button at
weak. If it is strong only near the outlet of cool air, keep food (especially damp
foods and easily frozen foods) away from the outlet.

Vegetables are frozen. Check the vegetables storage.

• If vegetables are stored in the refrigerator shelf or chilled drawer instead of
vegetable drawer, they will be frozen. Set the control button at weakif they are
also frozen in the vegetable drawer.

The food stored at inside of Check if food is stored near the outlet of the cooling air.
the shelf freezes even the • The temperature at cooling air outlet is always below the freezing point.
control button is set at MID. Do not store food near the outlet of the cooling air as it block the air circulation.
Do not block the outlet. If the outlet of the cooling air is blocked, the refrigerator
compartment will not be cooled.

- 85-
4-3. Odor and Frost
Problems Checks and Measures

Odor in the refrigerator compartment. Explain the basic principles of food odor.
• Each food has its own particular odor. Therefore it is impossible to prevent or
avoid food odor completely when food is stored in the completely sealed
refrigerator compartment. The deodorizer can absorb some portions of the odor
but not completely. The intensity of odor depends on refrigerator conditions and
environments.

Check the temperature control button and set at strong.

• Clean inside of the refrigerator with detergent and remove moisture. Dry inside
the refrigerator by opening the door for about 3 or 4 hours and then set the
temperature control button at strong .

Frost in the freezer compartment Explain the basic principles of frost formation.
• The main causes for frosting:
- Door was left open.
- Air penetration through the gasket
- Too frequent door opening. (parties. etc.)
- Hot foods are stored before they are cooled down. The temperature of freezer
is -19°C[-2.2°F]. if temperature is set at MID. If hot air comes into the
refrigerator, fine frost forms as cold air mixes with hot air. If this happens quite
often, much frost forms inside of the refrigerator. If the door is left open in
Summer, ice may form inside of the refrigerator.

Frost in ice tray. Explain basic principles of frost formation.

• When ice tray with full of water is put into a freezer compartment, the water
evaporates. If cool air fan operates, the moisture attached to the jaw (protruded
part) of ice mold will freeze and form frost. If warm water was put into the ice
mold, the situation will become worse.

- 86 -
4-4. Others
Problems Checks and Measures
The refrigerator case is hot. Explain the principles of radiator.
• The radiator pipes are installed in the refrigerator case and partition plate
between the refrigerator and the freezer compartment in order to prevent
condensation formation. Particularly in summer or after installation of
refrigerator, it may feel hot but it is normal. If there is not enough space to
dissipate heat, it can be hotter due to lack of heat radiation. Please install a
refrigerator in a well-ventilated place and leave the clearance between
refrigerator and wall:

Small holes in a door liner Explain that the hole is for releasing gas.
• A small hole in the door liner is for releasing gas during insulation materials
lining work. With a releasing hole, forming can be easily done .

Electric bills are too much. Explain that the hole is to allow the air to escape when vacuum forming plastic
parts and pumping foam insulation into cavities.
NOTE! Holes and releasing gas appear to be very crude and would not be
acceptable in a manual.
There are small holes in the plastic liner of some parts of the refrigerator. These
holes allow plastic parts to be injection molded and vacuum formed by allowing
air bubbles to be expelled. They also allow foam insulation to be pumped into
cavities where air bubbles may build up.

Condensation on the inside Explain how to store foods

wall of the refrigerator • Condensation forms when refrigerator is installed at damp area, door is
compartment and the cover of frequently opened, and wet foods are not stored in the air tight container or
properly vegetable drawer. wrapped. Be sure to store wet foods in airtight containers or securely covered in
plastic wrap.

When is the power connected? When should the power be connected ?

• You can connect the power immediately after installation. However, if the
refrigerator was laid flat before or during installation, you must stand it upright
for 6 hours before plugging it in. This allows the refrigerant oils to return to the
sump in the compressor. If you operate the refrigerator before the oil has had a
chance to settle, you could damage the compressor.

Door does not open properly. Refrigerator compartment door does not open properly.
• When the door is open, warm open air comes into the compartment and is
mixed up with cool air. This mixed air shall be compressed and increase the
internal pressure when door is closed. This causes the door sticked closely to
the refrigerator in a moment. (If the refrigerator is used for a long time, it will
open smoothly.)

When the refrigerator compartment door is opened and closed, the freezer
compartment door moves up and down.
• When the refrigerator compartment door is opened and closed, fresh air comes into
the freezer compartment and moves up and down the freezer compartment door.

Door opens too easily.

• There is a magnet in the gasket so it closes securely without a gap. It can be
held open easily if something is in the way and obstructs the door’s closing

A door does not close properly.

• If the refrigerator is not properly leveled, the doors will not close easily. Adjust
the level using the leveling screws under the front of the refrigerator.

- 87 -
#EV#

10. EXPLODED VIEW

FREEZER DOOR

200A

203A

201A

241F

244A
212J

241G

241G

241G

243A

-88-
#EV#

EXPLODED VIEW
REFRIGERATOR DOOR

230A

233A

231A

241K 212G

241H

241H
212J 244A

241J

241C

243B

-89-
#EV#

EXPLODED VIEW
FREEZER COMPARTMENT

281A

281C

406A

271B
271A

330B

405G

404A
405A 332A

610E 329A

903E

316B

301A 409A

158C
128E *

128F * 149A

401A

149A

149A

281G

106A
418A

332B
103C

319B
136A

-90-
#EV#

EXPLODED VIEW
REFRIGERATOR COMPARTMENT

140A

281B

281D

406A

271B

271C

141A 128G

611B 140B

128H

120B
120A

903D
611E
170A
412C

610E

140A
409A
604H

158A

128J 161A

281K
128K
281H
161B

151A

106A

154A

611A

128A

128B
151B

-91-
#EV#

EXPLODED VIEW
ICE &WATER PARTS

625A

622B

616E

616D
627D
627A

412A

619A
612A
612C

612B 600A
131A
607A
149D

602A

128L
600B

131C
406D

149E
125A 303B

610A 412B

614A

110B

621B

606A

-92-
#EV#

EXPLODED VIEW
MECHANICAL COMPARTMENT

SVC KIT COMPRESSOR

308A
307B
309A 310A

412D

501F 419B 307A

314A
103B

411A

410G

410H
501A 308A
103A 310A
309A
501K

412D

304A
316A

419B 307A

314A

317A
328A
323B
318A

105A

S15
319C 312A

329C

405C
315A
404B S38
305B
405C 419A

305C

319E 319A

305C 305B

-93-
#EV#

EXPLODED VIEW
DISPENSER PARTS

278A

161C

113E
S18 282G

405H

113F
617A
279B
501B
409B

279A

281F

278G

276B 276A

280A

-94-
#EV#

SERVICE KITS
Service Kits were created in order to facilitate to technician the way to replace previous components that due to
changes for structure, material o improves, can not be used individually.

Please refer to next table, and identify it in your exploded view.

Include
Loc No. Part Number Kit Description Loc No Part No. Description Reason Serial
307B ACF67062310 Compressor Assembly 310A 3550JA2042C Cover,PTC
412D 6877JB2040H Harness Assembly
In order to use it with objective to has the option of
419B MGE58810302 Pipe,Joint request it for a future compressor change and make
412D MJB61877901 Stopper,Compressor interchangeable. This kit is complety interchangeable For all production.
307A TCA30358201 Compressor,Set Assembly for any compressor model found for LSC27910
models.
308A 6748C-0002C Thermistor Assembly,PTC
309A 6750C-0004R Overload Protect

-95-
MFL62215907 OCTOBER 2009
REVIEW 01