LG GC-B379S*QA User manual

3SECS.
FREEZERFREEZER
EXPRESSFRZ. ECOMODE
FRIDGE
CHILDLOCK
DOORALARM
Ref.No
GC-B379S*QA
GC-B409S*QA
Ref.No
GC-B379S*CA
GC-B409S*CA
REFRIGERATOR
SERVICE MANUAL
http://biz.lgservice.com MODEL/COLOR:

SAFETY PRECAUTIONS ............................................................................................................................................................................................. 3
SERVICING PRECAUTIONS ....................................................................................................................................................................................... 4
SPECIFICATIONS .......................................................................................................................................................................................................... 5
PARTS IDENTIFICATION ............................................................................................................................................................................................ 6
INSTRUCTIONS FOR REVERSING DOOR SWING ............................................................................................................................................. 7-8
DISASSEMBLY ............................................................................................................................................................................................................... 8
DOOR ........................................................................................................................................................................................................................... 8
DOOR SWITCH .......................................................................................................................................................................................................... 8
REFRIGERATOR ROOM LAMP ............................................................................................................................................................................. 9
FAN AND FAN MOTOR …………………………………………………………………………………………………………...….............................................................. 9
DEFROST CONTROL ASSEMBLY ………………………………………………………………………………………………............................................................ 9
HEATER, SHEATH ……………………………………………………………………………………………………………………................................................................. 9
DISPLAY REMOVE ................................................................................................................................................................................................... 10
ADJUSTMENT .............................................................................................................................................................................................................. 10
COMPRESSOR ......................................................................................................................................................................................................... 10
PTC-STARTER ......................................................................................................................................................................................................... 10-11
NOTE TO USE PTC-STARTER ............................................................................................................................................................................ 11
OLP (OVER LOAD PROTECTOR) ....................................................................................................................................................................... 11
CIRCUIT DIAGRAM ..................................................................................................................................................................................................... 12
TROUBLESHOOTING ................................................................................................................................................................................................. 13
COMPRESSOR AND ELECTRIC COMPONENTS ......................................................................................................................................... 13
RELAY ASSEMBLY (PTC AND OLP) ................................................................................................................................................................. 14
ANOTHER ELECTRIC COMPONENT ................................................................................................................................................................ 15
SERVICE DIAGNOSIS CHART …………………………………………………………………………………………………............................................................. 16
REFRIGERATING CYCLE ...................................................................................................................................................................................... 17-19
MICOM FUNCTION & PCB CIRCUIT EXPLANATION ..................................................................................................................................... 20-34
EXPLODED VIEW .......................................................................................................................................................................................................... 35-38
Contents
APPENDIX FOR REFRIGERATORS SERVICE MAINTENANCE MANUAL ................................................................................................. 39
CONTENTS
2

Please read the following instructions before servicing your refrigerator.
1. Check the set for electric losses.
2. Unplug prior to servicing to prevent electric shock.
3. Whenever testing with power on, wear rubber gloves to prevent electric shock.
4. If you use any kind of appliance, check regular current, voltage and capacity.
5. Don't touch metal products in the freezer with wet hands. This may cause frostbite.
6. Prevent water from following onto electric elements in the mechanical parts.
7. When standing up after having checked the lower section of the refrigerator with the upper door open,
move with care to avoid hitting the upper door.
8. When tilting the set, remove any materials on the set, especially the thin plates(ex. Glass shelf or books.)
9. When servicing the evaporator, wear cotton gloves. This is to prevent injuries from the sharp evaporator fins.
10. Leave the disassembly of the refrigerating cycle to a specialized service center. The gas inside the circuit may pollute
the environment.
11. When you discharge the refrigerant, wear the protective safety glasses or goggle for eye safety.
12. When you repair the cycle system in refrigerator, the work area is well ventilated.
Especially if the refrigerant is R600a, there are no fire or heat sources. (No smoking)
SAFETY PRECAUTIONS
3

FEATURES OF REFRIGERANT (R600a)
• Achromatic and odor less gas.
• Flammable gas and the ignition (explosion) at 494°C.
• Upper/lower explosion limit: 1.8%~8.4%/Vol. Features of the R600a
refrigerator
• Charging of 60% refrigerant compared with a R134a model
• The suction pressure is below 1bar (abs) during the operation.
• Because of its low suction pressure, the external air may flow in the
cycle system when the refrigerant leak, and it causes malfunction in
the compressor.
• The displacement of compressor using R600a must be at least 1.7
times larger than that of R134a.
• Any type of dryer is applicable (XH-5, 7, 9).
• The EVAPORATOR or any other cycle part that has welding joint is
hidden in the foam. (If not hidden inside, the whole electric parts
must be tested with the LEAKAGE TEST according to the
IEC Standard.)
• The compressor has label of the refrigerant R600a.
• Only the SVC man must have an access to the system.
INSTALLATION PLACE
• Must be well ventilated.
• Must be 20 m3 or larger.
• Must be no-smoking area.
• No ignitable factors must be present.
UTILITIES
• Refrigerant cylinder (MAX NET 300g)
• Manometer
• Vacuum pump (600^/min)
• Piercing Clamp
• Quick coupler
• Hoses (5m-1EA, 1m-3EA)
• LOKRING
• Portable Leakage detector (3g/yearl)
• Nitrogen cylinder (for leakage test)
• Concentration gauge
MAKE SURE BEFORE SERVICING
• Refrigerant
Confirm the refrigerant by checking Name Plate and the label on the
compressor, after opening the COVER ASSEMBLY, BACK-M/C.
• If the refrigerant is R600a, you must not weld or apply a heat
source.
AIR RECHARGING IN COMPRESSOR
Before refilling the refrigerant, you must perform the test
according to Chapter 5 (TROUBLESHOOTING CHART).
When the defects are found, you must discharge the residual
refrigerant (R600a) in the outdoor. For discharging the refrigerant
R600a, break the narrow portion of tube extension by hand or with a
pipe cutter as shown in Figure 1. Leave it for 3O min in outside to
stabilize the pressure with ambient. Then, check the pressure by
piercing the dryer part with piercing pliers. If the refrigerant is not
completely discharged, let the refrigerator alone for more 3O min in
outside.
After the refrigerant (R600a) is completely discharged, repair any
defective parts and replace the dryer. At any case you must use the
LOKRING for connecting or replacing any part in the cycle
(No Fire, No Welding). Connect the Schrader valve to pump with the
coupler. And then turn the pump on for vacuum state (Figure 3). Let
the pump run until the low-pressure gauge indicates the vacuum
(gauge pressure 0, absolute pressure -1atm or -760mmHg).
Recommended vacuum time is 30 min. Charge the N2 gas in order
to check for leakage from welding points and the LOKRING. If
leakages are found, repair the defects and repeat the vacuum
process.
After the system is completely vacuumed, fill it with the
refrigerant R600a up to what has been specified at your refrigerator
Name Plate. The amount of refrigerant (R600a) must be precisely
measured within the error of ±2g by an electron scale (Figure 4).
REFRIGERANT (R600a) COUPLE CHARGING HOSE If you use the
manifold connected with both the refrigerant (R600a) cylinder and
the vacuum pump simultaneously, make sure the pump valve is
closed (Figure 5).
Connect the charging hose (that is connected to the refrigerant
(R600a) cylinder) to the Schrader valve installed on the service tube.
Then, charge the refrigerant (R600a) by controlling the Throttle
valve. When you do so, do not fully open the Throttle valve because
it may make damage to the compressor. Gradually charge the
refrigerant (R600a) by changing open and close the Throttle Valve
(5g at each time). The charging hose must use a one-way valve to
prevent the refrigerant refluence. Close the Schrader valve cap after
the refrigerant (R600a) is completely recharged.
After you completely recharge the refrigerant (R600a), perform the
leakage test by using a portable leakage detector or soapy water.
Test the low pressure (suction) parts in compressor off time and
high pressure parts in compressor on time. If the leakages are found,
restart from the refrigerant (R600a) discharging process and repairs
defects of leaks.
After the leakage test, check the temperature of each parts of the
cycle. Check with hands if the CONDENSER and the case
(HOT-LINE pipe) that is contacted to the door gasket are warm.
Confirm that frost is uniform distributed on the surface of the
EVAPORATOR.
Figure 3
Figure 4
Figure 5
Attach the service tube installed with a Schrader valve (one-way
valve) by using the LOKRING (Figure 2). Then, connect the Schrader
valve (one-way valve) to the pump that is connected to the
discharging hose leading to the outside. When discharging the
residual refrigerant, repeat 3 cycles that includes 3min of the pump
running  pump off  30 sec of the compressor running.
POINT TO BE
BROKET CHARGE TUBE
EXTENSION
SERVICE TUBE
EXTENSION
SCHRADER VALVE
(ONE-WAY VALVE)
LOKRING
Figure 2
Figure 1
SERVICING PRECAUTIONS
4

ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W)X643(D)X1737(H)
595(W)X643(D)X1907(H)
NET WEIGHT (kg) 69/75
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Micom Control
DEFROSTING SYSTEM Full Automatic
DOOR FINISH Pre-Coated Metal or
Vinyl Coated Metal
OUT CASE Painted Steel Sheet
INNER CASE ABS
INSULATION Polyurethane Foam
DEFROSTING DEVICE Heater, Sheath
REFRIGERANT R600a (58g)
LUBRICATION OIL FREOL S10 (220 cc)
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERATOR
COMPARTMENT
DOOR BASKET
FREEZER COMPARTMENT
Bottle Guide (1EA or 0EA)
Egg Tray (1EA)
Basket (6EA or 4EA)
2 ℓ Bottle Basket (1EA)
Tray Drawer (3EA)
Stars two ** section
Tray Ice (1EA)
Transparent Shelf (3EA or 2EA)
Magic Crisper (1EA)
Vegetable Container (1EA)
1. Ref. No: GC-B379/409S*CA 2. Ref. No: GC- B379/409S*QA
ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W)X643(D)X1737(H)
595(W)X643(D)X1907(H)
NET WEIGHT (kg) 69/75
COOLING SYSTEM Fan Cooling
TEMPERATURE CONTROL Micom Control
DEFROSTING SYSTEM Full Automatic
DOOR FINISH Pre-Coated Metal or
Vinyl Coated Metal
OUT CASE Painted Steel Sheet
INNER CASE ABS
INSULATION Polyurethane Foam
DEFROSTING DEVICE Heater, Sheath
REFRIGERANT R600a ( 58g)
LUBRICATION OIL FREOL S10 (220 cc)
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Wire Condenser
REFRIGERATOR
COMPARTMENT
DOOR BASKET
FREEZER COMPARTMENT
Bottle Guide (1EA or 0EA)
Egg Tray (1EA)
Basket (4EA or 2EA)
2 ℓ Bottle Basket (1EA)
Dairy Corner (2EA)
Tray Drawer (3EA)
Transparent Shelf (3EA or 2EA)
Magic Crisper (1EA)
Vegetable Container (1EA)
SPECIFICATIONS
5
Stars two ** section
Tray Ice (1EA)

Removable
Glass Shelf
Tray Ice
Freezer
Compartment
Leveling Screw
Egg Tray
Basket Door
Models:
GC**379S*QA
GC**379S*CA
GC**409S*QA
GC**409S*CA
Cover LED
Multi-air Flow Duct
Glass Rem Shelf
Vitamin Plus System
(Special models)
Vegetable Drawer
Dairy Corner
(Special models)
Dairy Corner
(optional)
Guide Bottle (optional)
Basket Door
Guide
(optional)
Display
(optional)
PARTS IDENTIFICATION
6

This refrigerator allows the owner to change the door swing if desired.
The hinging of the doors can be changed to the opposite side
anytime you wish.
A Warning Electric Shock Hazard Disconnect electrical supply to
refrigerator before installing. Failure to do so could result in death or
serious injury.
When reversing the door swing :
• Read the instructions all the way through before starting.
• Handle parts carefully to avoid scratching paint.
• Set screws/bolts down by their related parts to avoid using them in
the wrong places.
• Provide a non-scratching work surface for the doors.
IMPORTANT
Once you begin, do not move the cabinet until door-swing reversal is
completed.
These instructions are for changing the hinges from the right side to
the left side-if you ever want to change the hinges back to the right
side, follow these same instructions and reverse all references to left
and right.
Before Removing the Doors, empty and Remove all the Door Baskets
of both Refrigerator/ Freezer Doors, including the Bank Dairy.
Close both doors before removing hinge pins.
CAUTION
Do not let either door drop to the floor.
Doing so could damage the Door Stop.
12
3
5
4
A
6
A
75
9
8
10
11
14 12
6
13
5
How to Reverse the Door
1. After unscrewing the screw (2) of cover hinge (1) on the
top, take off cover hinge and disconnect cable (5) (Only for
the exterior display type models). Unscrew bolts (3), which
fasten upper hinge (4) and remove upper hinge (4). Carefully
take off the refrigerator’s door (A).Remove cap (6).
2. Remove cap cover of door (7) (only for the exterior display
type models), pull out cable (5) and install it into the opening
on the opposite side of the door.
Set the cap cover of door (7) in its place.
3. Screw out the screw (8) located under the refrigerator
door (A) and move it emphasis (9) to the opposite side.
Fixate the screw.
4. Move plastic caps (10) (for all types display) and (11) (only
for of interior type display models) to the opposite side.
5. (Only for exterior type display). Press by the (-)
screwdriver and separate caps (12) of cover front (13) and
unscrew screws (14), remove cover front (13), then move
cable (5) to the opposite side. After installation cover
front (13), screw by parts (14) and cover it by caps (12).
INSTRUCTIONS FOR REVERSING DOOR SWING
7

NOTE
Reversing the doors is not covered by the warranty
1. DOOR
• Freezer Door
1. Refer to previous chapter "Instruction
for Reversing Door Swing".
2. Pull out the Door Gasket to remove from
the Door Foam Assembly, F.
GASKET
• Refrigerator Door
1. Refer to previous chapter "Instruction for Reversing
Door Swing".
2. Pull out the Door Gasket to remove from the
Door Foam Assembly, R.
2. DOOR SWITCH
1. Unplug the power cord from the outlet.
2. Loosen five screws in upper part and disconnect Top
Cover Front.
3. Disconnect Lead Wire from switch.
4. Disengage hook behind the
switch by pressing it
with hands.
17
15
16
27
26
B
20
19
18
25
24
21v 23
16
19
20
15
B
29
3
2
28 5
6
6. Unscrew bolts (15) of the middle hinge (16), rise up the
freezer door (B) to remove it. Take off cap cover (17) and
install it instead of middle hinge (16).
Unscrew bolts (18) of lower hinge (19) rotating it by opposite
of clockwise and than screw it in opposite side hole.
Unscrew the bolts (20), which is fixing lower hinge (19) &
bolt (21) on the case of the refrigerator. Unscrew the screw
(22)on the bottom of the case which is fixated closer (23) of
the freezer door (B) , move closer (23) to the opposite side
in appropriated place and fix it up.
Unscrew the screw (24)on the bottom of the case which is
fixated emphasis (25) of the freezer door (B) , move
emphasis (25) to the opposite side in appropriated place
and fix it up.
Move the upper cap (26) on the opposite side.
7. Attach removed lower hinge (19) to the hole, located on
the opposite side of the case and tighten it by screws (20).
Screw in bolt (21) in the case of the refrigerator on
the opposite side. Install freezer door (B) to the pin in the
lower hinge (19). Turn over removed middle hinge (16) axis
outwards, and tighten it by screws (15) (Tight carefully to
prevent scratching of the door). Install the washer (27) on
the middle hinge (16).
22
8. Install the refrigerator door (A) through matching holes
in the lower of the door and pin of the middle hinge (16).
Then install the upper hinge (28), supplied with
refrigerator by placing in the appropriated hole of the
refrigerator door (A). Connect the connector cable (5)
(only for exterior display type models). Fix the upper hinge
(28) by bolts (3). Install cover upper hinge (29) and
tighten it by screw (2). Input the cover (6) which is
supplied with refrigerator.
INSTRUCTIONS FOR REVERSING DOOR SWING
8
DISASSEMBLY

4. FAN AND FAN MOTOR
1. Remove freezer drawers.
2. Remove two cap, screws and loosen two screws in
Grille Fan.
3. Pull out the Grille Fan and Shroud, F.
4. Disconnect the housing of lead wire.
5. Separate the Fan Assembly.
6. Losse 2 screw fixed to the Bracket.
7. Pull out Shroud, F remove the Fan Motor Assembly.
8. Separate the Motor Bracket and Rubber.
5. DEFROST CONTROL ASSEMBLY
Defrost Control Assembly consists of Thermistor and Fuse,
Melting. Thermistor functions to defrost automatically and it
is attached to metal side of the Evaporator and senses
temperature.
Fuse, Melting is a kind of safety device for preventing
overheating of the Heater when defrosting.
At the temperature of 77°C, it stops the emission of heat
from the Heater.
1.Pull out the Shroud, F after removing the Grille.
2.Separate the connector connected with the Defrost Control
Assembly and replace new one.
Thermister
Fuse, Melting
6. HEATER, SHEATH
In this refrigerator, Heater, Sheath is used for defrosting
heater. During heating, the temperature of heater rises
about 300 ~ 350 . Therefore, be careful not to burn while
servicing.
1.After removing the Grille and Shroud, separate the
Heater, Sheath by disconnecting the connectors.
2.Exchanged Heater, Sheath and connected the housing.
Heater, Sheath
3. REFRIGERATOR ROOM LED LAMP
1. Unplug the power cord from the outlet.
2. Assemble in reverse order of disassembly. Replacement must be
the same specification as original.
3. Remove the Cover Lamp, R by pulling with a '–' type driver.
4. Pull the latch to take out LED Lamp.
5. Remove the LED lamp by unplugin connect.
9
DISASSEMBLY

1. COMPRESSOR
1.Role
The compressor intakes low temperature and low pressure gas
evaporated from Evaporator of the Refrigerator, and condenses this
gas to high temperature and high pressure gas, and then plays
delivering role to Condenser.
2.Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus and Motor.
There is Relay Assembly (one set of PTC-Starter and Over Load
Protector (OLP)) in Compressor. On the other hand, because the
Compressor consists of 1/1000mm processing precision
components and is sealed after production in absence of dust or
humidity, deal and repair with care.
3. Note for Usage
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
(3) Use proper electric components appropriate to the Compressor.
(4) Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, the result may be poor operation and poor
contact may cause.
(5) Be careful that dust, humidity, and flux welding don't inflow in the
Compressor inside in replacing the Compressor. Dust, humidity,
and flux due to welding which inflows to Cylinder may cause
lockage and noise.
2. PTC-STARTER
1. Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is a no-contact
semiconductor starting device which uses ceramic
material and this material consists of ВаТiOз.
(2) The higher the temperature is, the higher becomes the
resistance value. These features are used as starting
device for the Motor.
2. Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies to
single-phase induction Motor.
For normal operation of the single-phase induction motor, in
the starting operation flows in both main coil and sub-coil.
After the starting is over, the current in subcoil is cut off. The
proper features of PTC play all the above roles. So, PTC is used
as a motor starting device.
3. PTC-Applied Circuit Diagram
•According to Starting Method for the Motor
7. DISPLAY REMOVE
1. Insert the blade of a knife in the middle bottom of the
screen carefully.
2. Tilt the knife down until the display while latches do not come
out of the grooves.
3. Remove the display.
10
ADJUSTMENTDISASSEMBLY

OVERLOAD
PROTECTOR(O.L.P)
RELAY ASSEMBLY
PTC STARTER
RSIR
HERMETIC
TERMINAL
COMPRESSOR
MOTOR
4. Motor Restarting and PTC Cooling (1) For restarting after power
off during normal Compressor Motor operation, plug the power
cord after 5 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
(2) During normal operation of the Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after the power has been shut off,
Motor can't operate again.
5. Relation of PTC-Starter and OLP
(1) If the power is off during operation of Compressor and
the power is on before the PTC is cooled, (instant shut- off
within 2 min. or reconnect a power plug due to misconnecting),
the PTC isn't cooled and a resistance value grows. As a result,
current can't flow to the sub-coil and the Motor can't operate
and the OLP operates by flowing over current in only in the
main-coil.
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.
If OLP doesn't operate when PTC is not cooled, Compressor
Motor is worn away and causes circuit-short and fire. Therefore,
use a properly fixed OLP without fail.
3. Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike Don't apply a forcible power or strike.
(3) Keep apart from any liquid.
If liquid such as oil or water away enter the PTC, PTC materials it
may break due to insulation breakdown of the material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If the exterior to the
PTC-starter is damaged, resistance value is altered and it may
cause poor starting of the compressor motor may cause.
(5) Use a properly fixed PTC.
4. OLP (OVER LOAD PROTECTOR)
1. Definition of OLP
(1) OLP (OVER LOAD PROTECTOR) is attached to the
Hermetic Compressor and protects the Motor by cutting
off current in Compressor Motor in case of over-rising
temperature by Bimetal in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
2. Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and Show Case and prevents the
Motor Coil from being started in the Compressor.
(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)
CONTACTING
POINT COVER
BIMETAL
BIMETAL
HEATER
HEATER
TERMINALS
ADJUST
SCREW
CONTACTING
POINT
ADJUSTMENT
11

12
CIRCUIT DIAGRAM
P.No.: MEZ62581565

1. Power
Source.
Remove the Relay
Assembly from the
Compressor and
measure the voltage
between Terminal C of
Compressor and
Terminals M or S of
Relay Assembly
No Voltage.
Applied voltage isn't in
the range of Rating
Voltage ±10%.
Advise the customer
to use a regular
Trans.
(Rating Voltage
±10%)?
YES 2
2. Check the
resistance of
Motor
Compressor.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
Replace
Compressor.
3. Check the
resistance of
PTC-Starter.
Check the resistance of
two terminals in PTC-
Starter.
4. Check OLP. Check if applying a
regular OLP.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
5. Check
starting state.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling
the PTC.
Components start in
the voltage of Rating
Voltage ±10% below.
Replace
Relay Assembly
O.K.
Replace
Compressor.
YES
YES
YES
NO
NO
YES
YES
NO
NO
3
5
4
5
5
1
43
5
5
1. COMPRESSOR AND ELECTRIC COMPONENT
13
TROUBLESHOOTING (Mechanical Part)

2. Relay assembly PTC AND OLP
Normal operation of
Compressor is
impossible or poor.
Separate the PTC
from Compressor and
measure the
resistance between
No. 5 and 6 or No.
4 and 5 of PTC with a
Tester or Whistone
Bridge. (Figure 22)
Separate the OLP
from Compressor and
check resistance value
between two terminals
of OLP with a Tester.
(Figure 23)
Check another
electric components.
Replace PTC.
Observation value is
±20%Ohm
220-240V/50Hz:
The resistance value is
0 or several
hundreds
The value is .
Check another
electric components.
YES
NO
Replace OLP.
33
TROUBLESHOOTING (Mechanical Part)
14

Cooling ability is poor
Compressor
doesn't run.
Check if current flows to
the following
components.
a. Thermistor Poor contacting.
b. Starting devices Shorted or broken.
gnitcatnocrooPPLO.c
or shorted.
d. Compressor coil Coil shorted.
e. Circuit Parts Poor contacting
or shorted.
Cause.
Check a starting
voltage. Low voltage. Raise the voltage.
Replace each
component.
Check if current flows
to starting devices.
Poor contacting and
broken.
Replace each
component.
Replace the
compressor.
Check current flowing
in sub-coil of
Compressor.
Shorted.
Check capacity of
OLP. Lack of capacity.
The items described
above are normal.
Coil of motor
Compressor.
Running state of
Compressor is poor.
Poor contacting.
Replace each
component.
Fan motor doesn't run.
Check current flowing
in the MOTOR[MECH],
FAN.
Coil is shorted.
Check current flowing
of the following
components.
•THERMISTOR
•FUSE, MELTING
Check current flowing
of the following
components.
•HEATER, SHEATH
Shorted. Replace each
component.
Defect on Heater,
Sheath.
Replace the Heater,
Sheath
Much frost are sticked
to the EVAPORATOR.
Cooling is impossible
Check current flowing
In PCB connector.
3. ANOTHER ELECTRIC COMPONENTS
TROUBLESHOOTING (Mechanical Part)
15

4. SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
Cooling ability is poor
Foods in the Refrigerator are
frozen.
• Check if the set is placed close to wall.
• Check if the set is placed close to stove, gas
cooker and direct rays.
• Is the ambient temperature high or the room
door closed?
• Check if put in is hot.
• Did you open the door of the set too often or
check if the door is closed up?
• Check if the Temperature Control is set
to "warm position".
• Place the set with the space of
about 10cm.
• Place the set apart from these heat
appliances.
• Make the ambient temperature below.
• Put in foods after cooled down.
• Don't open the door too often and
close it firmly.
• Set the control to cold position.
• Is foods placed in cooling air outlet?
• Check if the control is set to "cold-position".
• Is the ambient temperature below 5°C?
• Place foods in high temperature section.
(Front Part)
• Set the control to "mid-position".
• Set the control to "warm-position".
Dew or ice forms in the chamber
of the set
• Is liquid food stored?
• Check if put in is hot.
• Did you open the door of the set too often or
check if the door is closed up.
• Seal up liquid foods with wrap.
• Put in foods after cooled down.
• Don't open the door too often and
close it firmly.
Dew forms in the Exterior Case. • Check if ambient temperature and humidity of
surrounding air are high.
• Is there gap in the door packed?
• Wipe dew with a dry cloth. This
occurrence is solved naturally in low
temperature and humidity.
• Fill up the gap.
Abnormal noise generates.
• Are the set positioned in a firm and even place?
• Are any unnecessary objects set in the back
side of the set?
• Check if the Tray Drip is not firmly fixed.
• Check if the cover of mechanical room in
below and front side is taken out.
• Adjust the Adjust Screw, and position in
the firm place.
• Remove the objects.
• Fix it firmly on the original position.
• Place the cover at the original position.
To close the door is not handy.
• Check if the door packing is dirty with filth
such as juice.
• Is the set positioned in a firm and even place?
• Is too much food putted in the set?
• Clean the door packing.
• Position in the firm place and adjust the
Adjust Screw.
• Keep foods not to reach the door.
Ice and foods smell unpleasant.
• Check if the inside of the set is dirty.
• Did you keep smelly foods without wrapping?
• It smells of plastic.
• Clean the inside of the set.
• Wrap smelly foods.
• The new products smells of plastic,
but it is eliminated after 1-2 weeks.
• In addition to the items described left, refer to the followings to solve the complaint.
Check if dew forms in
the Freezer.
Check Refrigerating
Cycle.
Check the
Damper Control
Check if dew forms in
the Fridge.
The cycle is faulty.
The operation of the
Damper Control is poor.
Replace the Components
of defrosting circuit.
Repair the cycle.
Replace the Damper
Control
TROUBLESHOOTING (Mechanical Part)
16

TROUBLESHOOTING (Mechanical Part)TROUBLESHOOTING (Mechanical Part)TROUBLESHOOTING (Mechanical Part)TROUBLESHOOTING (Mechanical Part)
5. REFRIGERATING CYCLE
Troubleshooting Chart
CAUSE STATE OF THE SET STATE OF
THE EVAPORATOR
TEMPERATURE OF
THE COMPRESSOR REMARKS
LEAKAGE
PARTIAL
LEAKAGE
WHOLE
LEAKAGE
Freezer room and
Refrigerator don't
cool normally.
Freezer room and
Refrigerator don't
cool normally.
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only
Flowing sound of
Refrigerant is not heard
and frost isn't formed.
A little high more than
ambient temperature.
Equal to ambient
temperature.
• A little Refrigerant discharges.
• Normal cooling is possible when
injecting of Refrigerant the
regular amount.
• No discharging of Refrigerant.
• Normal cooling is possible when
injecting of Refrigerant
the regular amount.
CLOGGED BY DUST
PARTIAL
CLOG
WHOLE
CLOG
Freeze room and
Refrigerator don't
cool normally.
Freezer room and
Refrigerator
don't cool.
Flowing sound of
Refrigerant is heard and
frost forms in inlet only.
Flowing sound of
Refrigerant is not heard
and frost isn't formed.
A little high more than
ambient temperature.
Equal to ambient
temperature.
• Normal discharging
of refrigerant.
• The capillary tube is faulty.
• Normal discharging of
Refrigerant.
MOISTURE CLOG Cooling operation
stops periodically.
Flowing sound of
Refrigerant is not heard
and frost melts.
Low than ambient
temperature
• Cooling operation restarts when
heating the inlet of capillary tube.
DEFECTIVE
COMPRESSION
COMPRESSION
NO
COMPRESSION
Freezer and
Refrigerator
don't cool.
No compressing
operation.
Flowing sound of
Refrigerant is not
heard and no frost.
Low flowing sound of
Refrigerant is heard
and frost forms in inlet only.
A little high than
ambient temperature.
Equal to ambient
temperature.
• The pressure of high pressure
part in compressor is low.
• No pressure of high
pressure part in
the compressor.
Whether Compressor
runs or not.
Leakage Detection
• Observe discharging point of refrigerant which may be in the oil discharging
part in the compressor and hole of evaporator.
Moisture Clog.
Whether frost forms or
not in Evaporator.
Whether oil leaks or
not.
Frost formed normally
YES
No frost
or forms
in inlet
Observe the discharged
amount of Refrigerant.
Faulty Compressor. Inject Refrigerant to
Compressor
Normal amount
No or much amount
Check Compressor Clogged by dust. Gas leakage.
YES
(Check the leakage point)Frost formed normally
TROUBLESHOOTING (Mechanical Part)
17

General Control of Refrigerating Cycle
NO. ITEMS CONTENTS AND SPECIFICATIONS REMARKS
WELDING ROD
(1)H30
• Chemical Ingredients Ag: 30%, Cu:
27%, Zn: 23%, Cd: 20%
• Brazing Temperature: 710~840°C
(2) Bcup-2
• Chemical Ingredients Cu: About 93% P:
6.8-7.5% The rest: within 0.2%
• Brazing Temperature: 735~840°C
• Recommend H34 containing
34% Ag in the Service Center.
FLUX
• Ingredients and how to make Borax 30%
Borax 35%
Fluoridation kalium: 35% Water: 4%
Mix the above ingredients and boil until they are
transformed into liquid.
• Make amount for only day.
Holding period: 1 day
• Close the cover of container to prevent dust
putting in the FLUX.
• Keep it in a stainless steel container.
LOKRING
(Figure 23,24)
(1) Both of the tube is inserted up to the stop.
(2) Both of the LOKRING is pushed up to the stop
(3) The bending point is not too close to the
joint ending.
(4) During the assembly it is important that
both ends remain completely within the
joint.
• For a hermetically sealed metal/metal
connection, the tube ends have to be clean.
• LOKPREP is distributed all of out-surface of
the tube ends.
DRIER ASM
(1) Assemble the drier within 3Omin.
after unpacking.
(2) Keep the unpacked drier at the temperature
of80~100°C.
• Don't keep the drier in a outdoors because
humidity damages to it.
VACUUM
(1) When measuring with pirant Vacuum
gauge the charging М/С, vacuum
degree is within 1 Torr.
(2) If the vacuum degree of the cycle inside is
10 Torr. below for low pressure and 20 Torr.
for high pressure, it says no vacuum
leakage state.
(3) Vacuum degree of vacuum pump must be
0.05 Torr. below after 5 min.
(4) Vacuum degree must be same to the
value described item (2) above for more
than 20 min.
• Apply М/СVacuum Gauge without fail.
• Perform vacuum operation until a proper
vacuum degree is built up.
• If a proper vacuum degree isn't built up,
check the leakage from
the Cycle Pipe line part and Quick Coupler
Connecting part.
DRY AND AIR
NITROGEN GAS
(1) The pressure of dry air must be more
han 12~16kg/cm2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure at 12~6kg/cm2 also
when substituting dry air for Nitrogen Gas.
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage. • Check if gas leaks from joint of the Coupler
PIPE
(1) Put all Joint Pipes in a clean box and cover
tightly with the lid so that dust or humidity
is not inserted.
1.
2.
3.
4.
5.
6.
NIPPLE
AND COUPLER
7.
8.
TROUBLESHOOTING (Mechanical Part)
18

Figure 23. LOKRING
Figure 24. LOKRING TOOL
TOOL
ASSEMBLY JAWS
BOLT
TUBE LOKRING
LOKRING JOINT
TROUBLESHOOTING (Mechanical Part)
19

GC-B379S*QA
GC-B409S*QA
GC-B379S*CA
GC-B409S*CA
20
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
Quick freeze/
Economy mode
Economy mode
Temperature control in
freezing compartment
Temperature control in
refrigeration compartment
LED display lock button
Loose-fitting door alarm
Quick freeze Temperature control in
freezing compartment
Temperature control
in refrigeration compartment