service manual
FREEZER
EXPRESS FRZ.
DOOR ALARM
FRIDGE
ECO MODE
CHILD LOCK
3SECS.
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:
Edited by Foxit Reader
Copyright(C) by Foxit Software Company,2005-2008
For Evaluation Only.
CONTENTS
Contents
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
APPENDIX FOR REFRIGERATORS SERVICE MAINTENANCE MANUAL ................................................................................................. 39
2
SAFETY PRECAUTIONS
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)
3
SERVICING PRECAUTIONS
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.
POINT TO BE
BROKET
SERVICE TUBE
EXTENSION
Figure 1
CHARGE TUBE
EXTENSION
SCHRADER VALVE
(ONE-WAY VALVE)
LOKRING
Figure 2
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.
Figure 3
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.
Figure 4
Figure 5
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.
4 Confirm that frost is uniform distributed on the surface of the
EVAPORATOR.
SPECIFICATIONS
2. Ref. No: GC- B379/409S*QA
1. Ref. No: GC-B379/409S*CA
ITEMS
ITEMS
SPECIFICATIONS
SPECIFICATIONS
DIMENSIONS (mm)
595(W)X643(D)X1737(H)
595(W)X643(D)X1907(H)
DIMENSIONS (mm)
595(W)X643(D)X1737(H)
595(W)X643(D)X1907(H)
NET WEIGHT (kg)
69/75
NET WEIGHT (kg)
69/75
COOLING SYSTEM
Fan Cooling
COOLING SYSTEM
Fan Cooling
TEMPERATURE CONTROL
Micom Control
TEMPERATURE CONTROL
Micom Control
DEFROSTING SYSTEM
Full Automatic
DEFROSTING SYSTEM
Full Automatic
DOOR FINISH
Pre-Coated Metal or
Vinyl Coated Metal
DOOR FINISH
Pre-Coated Metal or
Vinyl Coated Metal
OUT CASE
Painted Steel Sheet
OUT CASE
Painted Steel Sheet
INNER CASE
ABS
INNER CASE
ABS
INSULATION
Polyurethane Foam
INSULATION
Polyurethane Foam
DEFROSTING DEVICE
Heater, Sheath
DEFROSTING DEVICE
Heater, Sheath
REFRIGERANT
R600a (58g)
REFRIGERANT
R600a ( 58g)
LUBRICATION OIL
FREOL S10 (220 cc)
LUBRICATION OIL
FREOL S10 (220 cc)
COMPRESSOR
PTC Starting Type
COMPRESSOR
PTC Starting Type
EVAPORATOR
Fin Tube Type
EVAPORATOR
Fin Tube Type
CONDENSER
Wire Condenser
CONDENSER
Wire Condenser
REFRIGERATOR
COMPARTMENT
Transparent Shelf (3EA or 2EA)
Magic Crisper (1EA)
Vegetable Container (1EA)
REFRIGERATOR
COMPARTMENT
Transparent Shelf (3EA or 2EA)
Magic Crisper (1EA)
Vegetable Container (1EA)
DOOR BASKET
Bottle Guide (1EA or 0EA)
Egg Tray (1EA)
Basket (6EA or 4EA)
2 ℓ Bottle Basket (1EA)
DOOR BASKET
Bottle Guide (1EA or 0EA)
Egg Tray (1EA)
Basket (4EA or 2EA)
2 ℓ Bottle Basket (1EA)
Dairy Corner (2EA)
FREEZER COMPARTMENT
Tray Drawer (3EA)
Stars two ** section
Tray Ice (1EA)
FREEZER COMPARTMENT
5
Tray Drawer (3EA)
Stars two ** section
Tray Ice (1EA)
PARTS IDENTIFICATION
Models:
GC**379S*QA
GC**379S*CA
GC**409S*QA
GC**409S*CA
Dairy Corner
(Special models)
Dairy Corner
(optional)
Display
(optional)
Removable
Glass Shelf
Egg Tray
Cover LED
Multi-air Flow Duct
Basket Door
Glass Rem Shelf
Vitamin Plus System
(Special models)
Vegetable Drawer
Guide Bottle (optional)
Basket Door
Guide
(optional)
Tray Ice
Freezer
Compartment
Leveling Screw
6
INSTRUCTIONS FOR REVERSING DOOR SWING
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.
11
5
7
A
9
8
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.
10
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.
CAUTION
Do not let either door drop to the floor.
Doing so could damage the Door Stop.
5
6
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).
13
14
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).
2
1
3
12
5
4
6
A
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.
7
INSTRUCTIONS FOR REVERSING DOOR SWING
DISASSEMBLY
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.
27
16
15
2
17
26
29
19
6
3
18
28
20
5
B
25
23
21v
24
22
NOTE
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).
16
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.
15
B
19
20
8
DISASSEMBLY
3. REFRIGERATOR ROOM LED LAMP
5. DEFROST CONTROL ASSEMBLY
1. Unplug the power cord from the outlet.
2. Assemble in reverse order of disassembly. Replacement must be
the same specification as original.
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
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.
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.
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.
Heater, Sheath
9
DISASSEMBLY
ADJUSTMENT
1. COMPRESSOR
7. DISPLAY REMOVE
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.
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.
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
10
ADJUSTMENT
3. Note to Use PTC-Starter
OVERLOAD
PROTECTOR(O.L.P)
(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.
COMPRESSOR
MOTOR
PTC STARTER
RSIR
HERMETIC
TERMINAL
RELAY ASSEMBLY
4. OLP (OVER LOAD PROTECTOR)
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.
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
CONTACTING
POINT
HEATER
TERMINALS
BIMETAL
ADJUST
SCREW
HEATER
11
CIRCUIT DIAGRAM
P.No.: MEZ62581565
12
TROUBLESHOOTING (Mechanical Part)
1. COMPRESSOR AND ELECTRIC COMPONENT
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
YES
(Rating Voltage
±10%)?
2
No Voltage.
5
Applied voltage isn't in
the range of Rating
Voltage ±10%.
2.
3.
Check the
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
Advise the customer
to use a regular
Trans.
5
YES
3
Replace
Compressor.
NO
3
YES
Check the resistance of
two terminals in PTCStarter.
Replace
Compressor.
NO
5.
Check OLP.
Check
starting state.
Check if applying a
regular OLP.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
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.
YES
NO
5
5
Replace
Relay Assembly
YES
O.K.
NO
13
5
4
YES
4.
4
1
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)
Observation value is
220-240V/50Hz:
33 ±20%Ohm
The resistance value is
0 or several
hundreds
The value is
Separate the OLP
from Compressor and
check resistance value
between two terminals
of OLP with a Tester.
(Figure 23)
YES
.
Check another
electric components.
NO
Replace OLP.
14
Check another
electric components.
Replace PTC.
TROUBLESHOOTING (Mechanical Part)
3. ANOTHER ELECTRIC COMPONENTS
Cooling is impossible
Compressor
doesn't run.
Running state of
Compressor is poor.
Check if current flows to
the following
components.
Cause.
a. Thermistor
Poor contacting.
b. Starting devices
Shorted or broken.
c. OLP
P oor conta cting
or shorted.
d. Compressor coil
Coil shorted.
e. Circuit Parts
Poor contacting
or shorted.
Replace each
component.
Check a starting
voltage.
Low voltage.
Raise the voltage.
Check if current flows
to starting devices.
Poor contacting and
broken.
Replace each
component.
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.
Replace the
compressor.
Cooling ability is poor
Fan motor doesn't run.
Check current flowing
In PCB connector.
Poor contacting.
Replace each
component.
Check current flowing
in the MOTOR[MECH],
FAN.
Much frost are sticked
to the EVAPORATOR.
Coil is shorted.
Check current flowing
of the following
components.
• THERMISTOR
• FUSE, MELTING
Check current flowing
of the following
components.
• HEATER, SHEATH
15
Shorted.
Replace each
component.
Defect on Heater,
Sheath.
Replace the Heater,
Sheath
TROUBLESHOOTING (Mechanical Part)
4. SERVICE DIAGNOSIS CHART
COMPLAINT
Cooling ability is poor
Foods in the Refrigerator are
frozen.
Dew or ice forms in the chamber
of the set
Dew forms in the Exterior Case.
POINTS TO BE CHECKED
REMEDY
• 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".
• 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.
• 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.
• In addition to the items described left, refer to the followings to solve the complaint.
Check if dew forms in
the Freezer.
Check if dew forms in
the Fridge.
Check Refrigerating
Cycle.
The cycle is faulty.
Repair the cycle.
The operation of the
Damper Control is poor.
Replace the Damper
Control
Check the
Damper Control
Replace the Components
of defrosting circuit.
16
• Clean the inside of the set.
• Wrap smelly foods.
• The new products smells of plastic,
but it is eliminated after 1-2 weeks.
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
Freezer room and
Refrigerator don't
cool normally.
Low flowing sound of
Refrigerant is heard and
frost forms in inlet only
A little high more than
ambient temperature.
WHOLE
LEAKAGE
Freezer room and
Refrigerator don't
cool normally.
Flowing sound of
Refrigerant is not heard
and frost isn't formed.
Equal to ambient
temperature.
PARTIAL
CLOG
Freeze room and
Refrigerator don't
cool normally.
Flowing sound of
Refrigerant is heard and
frost forms in inlet only.
A little high more than
ambient temperature.
• Normal discharging
of refrigerant.
• The capillary tube is faulty.
WHOLE
CLOG
Freezer room and
Refrigerator
don't cool.
Flowing sound of
Refrigerant is not heard
and frost isn't formed.
Equal to ambient
temperature.
• 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.
COMPRESSION
Freezer and
Refrigerator
don't cool.
Low flowing sound of
Refrigerant is heard
and frost forms in inlet only.
A little high than
ambient temperature.
• The pressure of high pressure
part in compressor is low.
NO
COMPRESSION
No compressing
operation.
Flowing sound of
Refrigerant is not
heard and no frost.
Equal to ambient
temperature.
• No pressure of high
pressure part in
the compressor.
DEFECTIVE
COMPRESSION
CLOGGED BY DUST
LEAKAGE
PARTIAL
LEAKAGE
• 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.
Leakage Detection
• Observe discharging point of refrigerant which may be in the oil discharging
part in the compressor and hole of evaporator.
Whether Compressor
runs or not.
YES
Whether frost forms or
not in Evaporator.
No frost
or forms
in inlet
Whether oil leaks or
not.
Frost formed normally
Observe the discharged
amount of Refrigerant.
Normal amount
YES
No or much amount
Moisture Clog.
Inject Refrigerant to
Compressor
Faulty Compressor.
Check Compressor
Clogged by dust.
Frost formed normally
17
Gas leakage.
(Check the leakage point)
TROUBLESHOOTING (Mechanical Part)
General Control of Refrigerating Cycle
NO.
1.
2.
3.
4.
5.
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.
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.
6.
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.
7.
NIPPLE
AND COUPLER
(1) Check if gas leaks with soapy water.
(2) Replace Quick Coupler in case of leakage.
8.
PIPE
(1) Put all Joint Pipes in a clean box and cover
tightly with the lid so that dust or humidity
is not inserted.
18
• Don't keep the drier in a outdoors because
humidity damages to it.
• Apply М/С Vacuum 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.
• Check if gas leaks from joint of the Coupler
TROUBLESHOOTING (Mechanical Part)
TUBE
LOKRING
LOKRING
JOINT
Figure 23. LOKRING
ASSEMBLY JAWS
BOLT
TOOL
Figure 24. LOKRING TOOL
19
Edited by Foxit Reader
Copyright(C) by Foxit Software Company,2005-2008
For Evaluation Only.
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
GC-B379S*QA
GC-B409S*QA
Temperature control in
freezing compartment
Temperature control in
refrigeration compartment
Quick freeze/
Economy mode
LED display lock button
Loose-fitting door alarm
GC-B379S*CA
GC-B409S*CA
Quick freeze
Temperature control in
freezing compartment
Temperature control
in refrigeration compartment
20
Economy mode
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
How to adjust the temperature in the fridge and freezer compartment
• The initial temperature of the fridge and freezer compartments is -20°C and 3°C respectively.
You can now adjust the temperature of the compartments as you want.
GC-B379S*QA / GC-B409S*QA
GC-B379S*CA / GC-B409S*CA
Freezer, refrigerator NOTCH and temperature setup display part
• Freezer and fridge temperature display shows the temperature that is setted on the display when the button is pressed according
to the NOTCH set temperature.
unit : temperature
GC-B379S*QA / GC-B409S*QA
First Power On
1time
press
2times
press
3times
press
4times
press
5times
press
6times
press
7times
press
NOTCH
-20
-21
-22
-23
-15
-16
-17
-18
-19
-20
Setting temp
-20
-21
-22
-23
-15
-16
-17
-18
-19
-20
classification
8times
press
First Power On
1time
press
2times
press
3times
press
4times
press
5times
press
6times
press
7times
press
NOTCH
3
2
1
0
6
5
4
3
Setting temp
3
2
1
0
6
5
4
3
classification
GC-B379S*CA / GC-B409S*CA
classification
unit : temperature
4times
press
5times
press
-15
-
-20
-23
-15
-17,5
-20
First Power On
1time
press
2times
press
NOTCH
-20
-
-23
Setting temp
-20
-21,5
3times
press
First Power On
1time
press
2times
press
3times
press
4times
press
5times
press
NOTCH
3
-
0
6
-
3
Setting temp
3
1.5
0
6
4.5
3
classification
21
9times
press
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
Express Freezing function
Eco Friendly function
You can use this function for quick freezing. This function is used
when you want to freeze the food quickly.
This function tunes on the power saving mode which is useful when
you are away for holiday. It helps to reduce energy consumption.
It helps to reduce energy consumption.
Express Freezing on/off method
• Press the Express Frz. Button once. The Express Frz. Lamp turns on
and the quick freezing starts.
• If you want to stop the quick freezing operation, press
the Express Frz. Button once more, the lamp goes out, and the
Express Frz. Operation stops and the refrigerator returns to
the previous temperature setting.
• Eco Friendly on/off method
• To start the function press ECO FRIENDLY button,
the lamp will turn on.
• To stop the function press the button again.
DISPLAY operating of Eco Friendly function
• when pressing button for the first time Eco Friendly function has to
be turned on.
• icons of freezer/fridge temperature after pressing Eco Friendly are
shown in pic.1(c) and pic.2(c).
• state of freezer/fridge temperature after turning off Eco Friendly
are shown in pic.1(d) and pic.2(d).
• other buttons don’t function while Eco Friendly is turned on except
Door Alarm, Lock and Power buttons.
Operation status during Eco Friendly
• freezer and fridge display is controlled by the minimal Notch.
• control temperature of freezer / refrigerator has to be at
minimal Notch.
DISPLAY operation of Express Freezing function
• when pressing button for the first time Express
Freezing has to be on.
• freezer/ fridge temperature is not change.
• when pressing button for the next time Express Freezing
has to be off.
• changing setup of freezer/fridge temperature on display is
possible during Express Freezing.
Load operation during the Express Freezing.
• Load operation during the start of Express Freezing and
maintenance of express freezing function during 24 hours: for
the first 7 hours compressor operates continually, last 17 hours
temperature maintains on -27°C in a freezer only.
• in case when compressor stops in the process of express freezing
time delays and terminates after continuous operation during 7 hrs.
On LED Display Type Model (GA-B429/439/489**CA) one press
Express Frz./ECO Friendly button once to turn the Express Frz.mode
on. Press the button again to turn ECO Friendly mode on. Pressing
the button third time will turn both modes off and return
the previous temperature setting.
If you have signal of defrost during Express Freezing, defrost
time is included.
NOTE
When the Eco Friendly mode is “ON”, the other buttons will
not operate. When you don't need this function any more press
the Eco Friendly button to return the appliance to its previous
temperature setting and turn on other buttons.
22
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
Door Alarm and Alarm locking function
The display indication of different Models during
Express Freezing & Eco-Friendly on/off is shown below:
(a) Normal mode
Door Alarm on/off method:
• on : press the Lock/Alarm button 1 time.
• off : press the Lock/Alarm button 1 time.
DISPLAY operation of Door Alarm function:
• when Power is ON during the first time Door Alarm has to be on.
• when the power is ON, the Buzzer Icon has to be ON
in accordance with (a).
• when the power is OFF, the Buzzer Icon has to be OFF
in accordance with (b).
Door Alarm function:
• after 60 seconds when the door is opened, the fridge door
open alarm sounds.
• after this the alarm sounds 3 times with 0,5 seconds interval. Then
alarm sounds every 30 seconds with 0,5 sec interval.
• if the door closed during the Buzzer signal, Buzzer sound will
stop immediately.
• press the Door Alarm button for stop Buzzer signal.
Display Micom gets the information about door open, started
from Main Micom:
• the function of Door Alarm starts. For stopping the signal you
have to close the door.
(b) Express Freezing
start
LOCK function (Display button lock)
(c) Eco Friendly start
LOCK on/off method
• on : press continuously the Lock/Alarm button
for 3 seconds or more.
• off : press continuously the Lock/Alarm button for 3
seconds or more.
DISPLAY operation of LOCK function
• before the first power on the lock has to be unfasten.
• at locking time the Lock button indication flashes 3 times.
(except Bar LED) after 3 seconds the lock icon (b)
becomes fasten.
• at unlocking time the Lock button indication flashes 3 times.
(except Bar LED) after 3 seconds the lock icon (a)
becomes unfasten.
• There is no buzzer sounds when the button pressed in fasten
situation other than
Lock button. switching function is also not available.
At this time, the indication of the Best 88 Display Lock button
flashes 3 times.
(d) Switching off.
Continue normal mode
Figure.1. GC-B379S*QA
GC-B409S*QA
23
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
Unlock
(1) Defrosting starts each time the COMPRESSOR running time
limit 50 hours.
(2) When door is opened for 1 second limit time will be reduced
on 8 minut but totally not less than 7 hours
(3)For initial power on defrosting starts
when the compressor running time reaches 4 hours.
(4) Defrosting stops if the sensor temperature reaches 8°C or more.
If the sensor doesn’t reach 8°C in 2hours, the defrost
mode is malfunctioning. (Refer to the defect diagnosis function.)
(5) Defrosting won’t function if its sensor is defective (wires are
cut or short circuited)
Unlock
Lock
Display power-saving mode
Power- saving mode on/off method:
• on : If the display buttons are not pressed during 20 seconds or
more, the mode starts automatically .
• off : press 1 time any button during power- saving mode.
DISPLAY operation of power- saving mode:
• in the process of power- saving mode, all indications are turned
off, except Lock Icon.
• when the mode turned off, display shows the previous state of
the power-saving mode.
8. ELECTRICAL PARTS ARE TURNED ON SEQUENTIALLY
Electrical parts such as COMP. defrosting heater. freezer FAN. etc.
are turned on in the following order to prevent noise and
parts damage. Several parts are started at the dame time at initial
power on and are turned off together when TEST is
completed. (PIC.1)
10. DEFECT DIAGNOSIS FUNCTION
(1) Automatic diagnosis makes servicing the refrigerator easy.
(2) When a defect occurs, the buttons will not operate: but the
tones, such as ding, will sound.
(3) When the defect CODE removes the sign, it returns to normal
operation (RESET).
(4) The defect CODE shows on the Refrigerator and Freezer Display.
(PIC.2,3)
GC-B379S*QA/GC-B409S*QA
5. DOOR OPEN ALARM
(1) Buzzer shall give warnings if freezer, refrigerator, or home
bar door is open for more than one minute.
(2) Buzzer shall give warnings three times in 0.5 second
interval, then three times on/off in 0.5 second interval in
every thirty seconds.
(3) Warnings are ceased when freezer, refrigerator and
home bar doors are all closed.
FREEZER
REFRIGERATOR CLOSE
DOOR
CLOSE
CLOSE
CLOSE
CLOSE
500 ms
BUZZER
within
1 minute
1 min
GC-B379S*CA
GC-B409S*CA
30 sec
6. BUZZER SOUND
(1) When the button on the front Display is pushed,
a Ding ~ sound is produced.
(Refer to the BUZZER OPERATION CHECK)
-15 · -20 · -23 °C
EXPRESS FRZ.
7. DEFROSTING (REMOVING FROST)
24
FREEZER
6 · 3 · 0 °C
FRIDGE
ECO FRIENDLY
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
ORDER
INITIAL POWER ON
OPERATION STATE
COMP
POWER
in 1/2 second
&
ON
C-FAN
ON
Temperature of Defrosting
Sensor is 45°C or more
(when unit is newly
purchased or when moved)
F- FAN
ON
in 1/2 second DAMPER
FRIDGE
ON
POWER
in 1/2 second DEFROSTING in 5 second DEFROSTING
in 1/2 second
ON
HEATER ON
HEATER OFF
Temperature of defrosting
sensor is lower than 45°C
(when power cuts, SERVICE)
COMP
in 1/2 second
&
C-FAN
ON
Reset to normal operation
from TEST MODE
F- FAN
ON
in 1/2 second DAMPER
FRIDGE
ON
TOTAL LOAD in 7 minute
OFF
COMP in 1/2 second FREEZER FAN
ON
ON
Figure 1
Designation and confirmation of different failure
(GC-B379S*QA/GC-B409S*QA)
NO
1.
Item
Normal
ERORR CODE
Freezer and Refigerator
temperature setting
Setup temperature
indication
Details of the failure
-
REMARKS
Normal Display Switch
2.
Failure of freezer
sensor
FS E
Freezer sensor disconnection or
short circuit
3.
Failure of Refigerator
sensor
rS E
Refrigerator sensor
disconnection or short circuit
4.
Failure of defrost
sensor
dS F
Defrost sensor short circuit or
disconnection
5.
Ambient sensor
failure
rt E
Ambient sensor short circuit or
disconnection
6.
Poor of defrost
dH F
120 minutes after defrost
starting if the defrost
sensor is not more than 7 C°
Temperature Fuse
disconnection, heater
disconnection, Drain blockage,
heater driving Relay failure
7.
Connection failure
CO E
Connection failure between
Main PCB and Display PCB
Connection wiring and
transmittion TR, receiver failure
8.
FF E
9.
CF E
EXPRESS FRZ.
Figure 2
25
Check sensor wiring
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
Show ERROR CODE on display panel (For models GC-B379S*CA/GC-B409S*CA).
1.
Internal display
EXPRESS FRZ.
FREEZER
2.
-15 · -20 · -23 °C
6 · 3 · 0 °C
5 · -4 · -9 °F
43 · 37 · 32 °F
FRIDGE
ITEM
NO
ECO FRIENDLY
ERROR CODE
1.
2.
1.
Failure of Freezer sensor
All off
2.
Failure of Refrigerator sensor
All off
3.
Failure of defrost sensor
All off
4.
Poor of defrost
5.
Failure of Ambient sensor
All off
All off
(NOTE 1)
6.
All off
7.
All off
OFF
ON
NOTE
When Should read EXPRESS FRZ. button and
FREEZER Temp button are pushed and held for 1 second or
longer, ERROR CODE of Ambient sensor is expressed.
Operation control for each failure (Failure Mode)
NO
Operation control
Classification
COMP
1.
Normal
2.
Freezer sensor failure
3.
Fridge sensor failure
4.
Defrost sensor failure
5.
Ambient sensor failure
6.
Defrost failure
7.
Main PCB
Connection failure
8.
Abnormal Cooling Fan
9.
Abnormal Freezing Fan
15min ON
15min OFF
Fan of Engine section
FAN of freezer
Defrost heater
Damper of refrigerator
15min ON/
15min OFF
Sensor failure time
10min
OPEN/15min CLOSE
No defrost
(Return immediately)
(No compensation of
ambient temperature)
(Standard
Operation)
ON/OFF
(Recycle)
ON/OFF
(Recycle)
227
26
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
TEST function
TEST function
• If the temperature is above than 45 C° when the first time defrost
sensor is power on, the primary defrost conditions are proceed. In
case of temperature is lower than 45 C°, LQC heater check mode
starts.
• The TEST 1 mode returns to previous condition in 120 min after
turning on.
• During the switching state from TEST 1 to TEST 2, load delay is
0.5 sec. (sound proof)
• If the buttons of display are pressed in TEST mode, the functions
will not operate.
• If you find any fault in the sensor in TEST mode, damage
designation will indicate on the display.
• If the TEST mode is turned ON during power on, the TEST
functions are not proceeded but the
• General normal mode.
• If the TEST functions are not operate in the error mode or failure
occurs during the TEST mode
• Function fault designation will indicate on the display after reset
the MICOM(Return to normal mode).
Attention
• If the sensor becomes above 45 C° within 10 seconds after starting
the defrost heater, it will return to its normal state. (the primal LQC
heater check àSee also the order of the operation status)
Display indication while TEST mode is turned on
TEST1
MODE
TEST2
MODE
Attention
• If Short made in TEST terminal, the TEST 1 condition will maintain.
GC-B379S*QA/GC-B409S*QA
TEST1
MODE
-15 · -20 · -23 °C
EXPRESS FRZ.
6 · 3 · 0 °C
FREEZER
FRIDGE
ECO FRIENDLY
TEST2
MODE
-15 · -20 · -23 °C
EXPRESS FRZ.
FREEZER
6 · 3 · 0 °C
FRIDGE
ECO FRIENDLY
GC-B379S*CA/GC-B409S*CA
27
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
TEST mode function
If Short made in TEST terminal, the
TEST 1 condition will maintain.
7
Internal display Test 2 Mode
FUNCTION DESCRIPTION
1. Power Circuits
PARTS
VA1
CE2
CE3
VOLTAGE
230Vac
12Vdc
5Vdc
TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricity to
MICOM and IC (5Vdc). The voltage in each part is as follows.
28
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
2. OSCILLATION CIRCUIT
CIRCUIT for occurring CLOCK which motivates the internal local element of IC1 to transmit and receive an information and
BASIC TIME for calculating time. Use a proper form for OSC 1. Because in case that SPECIFICATION is changed, the calculated time in IC1
is changed or IC1 isn't able to operate.
3. RESET CIRCUIT
All the internal parts of MICOM(IC1) return to the initial condition when the early power ON or apply power again in MICOM after
temporary power failure. As a result, all the functions operate according to the early condition. At the early period of power ON the "LOW"
voltage is applied in the RESET terminal of MICOM for the fixed time. The RESET terminal is 5V during the general operation.
+5
+5
IC6
I
CC9
104
KIA7042 3
2
R26
4.7K 8
R27
100
CE6
IuF
/50V
29
CC10
104
RESET
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
4. LOAD/BUZZER OPERATION.
(1) LOAD OPERATION CHECK
(2) BUZZER OPERATION CHECK
51
50
30
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
5. TEMP SENSOR CIRCUITS, DOOR OPENING SENSING
The above circuit reads surrounding temperature, FREEZER temperature, REFFIGERATOR temperature into MICOM( IC1). OPEN or SHORT
state of each SENSOR is as follows
CHECK POINT
SENSOR
RT SENSOR
POINT A Voltage
FREEZER SENSOR
POINT B Voltage
REFRIGERATOR
SENSOR
POINT C Voltage
DEFROST SENSOR
POINT D Voltage
NORMAL
(-30°C~50°C)
SHORT
OPEN
0.5V ~ 4.5V
0V
5V
Measure point
NO.25 OF IC 1 (MICOM)
Refrigerator door
CLOSE
5V(S/W of 2 , 1 is OFF state)
OPEN
0V(S/W of 2 , 1 is ON state)
31
Edited by Foxit Reader
Copyright(C) by Foxit Software Company,2005-2008
For Evaluation Only.
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
SWITCH INPUT CIRCUIT
The following circuit is a test switch input circuit for checking the refrigerator.
P20
TEMPERATURE COMPENSATION
25 P65
32
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
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Inner MICOM DISPLAY
GC-B379S*CA/GC-B409S*CA
GC-B379S*QA/GC-B409S*QA
33
EXPLODED VIEW & REPLACEMENT PARTS LIST
GC-B379S*CA/GC-B409S*CA
230A
501F
281H
103B
103A
231A
407B
501A
281E
281F
281B
281A
102B
102A
239A
402A
503A
233A
102C
610E
282B
210A
109A
230B
610E
281D
304A
128C
128D
283B
201A
203A
210B
108A
108A
EXPLODED VIEW & REPLACEMENT PARTS LIST
GC-B379S*CA/GC-B409S*CA/GC-B379S*QA/GC-B409S*QA
120E
120A
120B
401B
604F
318A
120D
317A
310A
307A
316B
314A
303D
308A
420A
309A
312A
411A
105A
405F 404A
401A
104A
405C 405A
104C
301A
329A
323B
106B
329C
319B
332A
319C
420A
418A
319A
327A 328A
315C
315B
315A
330B
EXPLODED VIEW & REPLACEMENT PARTS LIST
GC-B379S*CA/GC-B409S*CA/GC-B379S*QA/GC-B409S*QA
241A
136E
103E
154B
235A
155A
154D
241C
154G
151B
125A
136A
136B
136C
136D
APPENDIX FOR REFRIGERATORS SERVICE MAINTENANCE MANUAL
Appendix for refrigerators service maintenance manual
1. Master should phone with client for appeal reasons clarification before visit.
2. Agree the accepted request with the senior master, for more accurate malfunction identification and for taking of reserve parts and
equipment needed.
3. Arriving to the customer inspect refrigerator for the presence of mechanical damages. In case of damages presence fix them on
the camera or any other digital technics.
4. The temperature indoors should be not below 16 degrees.
In case of malfunction concerned with lack of food cooling in refrigerator or freezer it is necessary to check filter-drain warming up
(it should be warm). The fact that filter is cold indicates the system clogging or the leak of refrigerant. Check all visible parts of the pipes and
pipes joints (solderings) with the leak detector designed for refrigerants R143a or R600a. At the time of diagnostics isolate the air flow
directed from the fan of the condenser and compressor. In case of leak detection eliminate it.
For leak elimination it is necessary to:
- crop refueling pipe with pipe cutter;
- make pumping process for 10-15 minutes;
- solder again the area of leak by gas torch or cut this area by pipe cutter, expand pipe and solder it in the place cutting off earlier;
- change filter to LG brand filter for refrigerant R134a or R600a (depends on refrigerant used by compressor);
- make pumping process for 10-15 minutes again;
- fill the unit with necessary refrigerant amount specified in grams on the label inside the product;
- remember that the pressure during the normal operating of refrigerator should be equal to
• «0+0.5Br» – for refrigerators with refrigerating unit operating with R134a refrigerant;
• «-0.5Br» – for refrigerators with refrigerating unit operating with R600a refrigerant.
If to cut off capillary pipe hardly below the filter-drain, flow capability of refrigerant will be bad at capillary pipe clogging from capillary side.
Oil with shavings of rubbing parts got into system from compressor can be the reason of capillary pipe clogging.
There are 3 ways to eliminate capillary pipe clogging.
1. Bursting with nitrogen is the easiest and less expensive way.
Cut off the suction pipe near the compressor and the capillary pipe near the filter. Wind reductor on the nitrogen balloon and connect a
reinforced hose to reductor (it can be the hose for manometric rail). Hose must withstand at least 20atm. Connect a hose from the balloon
to manometric rail, and a hose from manometric rail (high pressure side) to suction pipe of refrigerator. Open the nitrogen bottle. The
pressure over 13 atmospheres for refrigerators with tube-on-sheet evaporator and the pressure over 20 atmospheres for refrigerators with
tubular evaporator are not recommended. Close balloon and block valve on a rail. It is recommended to wait at least 10-15 minutes.
Pressure decrease means that the obstruction began to be eliminated. If the pressure remains unchanged go to second method.
2. Punching hydraulic press.
Take the hydraulic press for punching a capillary pipe (you can buy it in auto stores,
they are used for pressing various parts.) Fill the oil in hydraulic press, which use in the similar refrigerator.
Then connect a hydraulic press to a capillary pipe and maximum pump oil by hydraulic press in a
capillary tube. Obstruction is eliminated not immediately, it takes time while the oil passed through
the capillary.
3. Bursting with dichloromethyl
To solder a pipe 1 / 4 with schrader valve on cutting capillary pipe near the filter. To unscrew from the valve spool. and fill there from
syringe volume of 5-10 ml of dichloromethyl. Then, to wind the hose onto the valve. And serve the liquid refrigerant R22 through the
manometer rail, if there is not the R134. Gas should not much, it needed only to dichloromethyl held in the capillary. Add nitrogen to
provide high pressure and wait. Dichloromethyl gradually dissolves clots and at the beginning passage would be minimal. Operation should
be repeated 2-3 times.For greater effect, I recommend plugging your finger suction pipe to increase the pressure in the system, When the
sudden opening more oil comes out of it. Then you must do exactly the same operation on suction side, in the opposite direction.
When the oil is no longer out of the system, ALWAYS thoroughly purged with nitrogen through a suction pipe to remove residual
dichloromethyl. Dichloromethyl dissolves varnish motor windings, that will lead to failure of the compressor. To verify that the obstruction is
eliminated completely , must be submitted through
Liquid refrigerant through the suction pipe and while the capillary pipe should be covered with ice and the oil should not come out of it. You
can verify this by substituting under a stream of refrigerant, for example, pliers.
Be extremely careful when you cure the obstruction. Oil suddenly can shoot and dirty all around, recommend to cover the cloth.
45
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