LG GR-359 User manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-359/399
REFRIGERATOR
SERVICE MANUAL

SAFETY PRECAUTIONS ....................................................................................................................................................... 2
SERVICING PRECAUTIONS.................................................................................................................................................. 3
SPECIFICATIONS................................................................................................................................................................... 4
PARTS IDENTIFICATION ....................................................................................................................................................... 5
REPLACEMENT OF DOOR OPENING TYPE ....................................................................................................................... 6
DISASSEMBLY.................................................................................................................................................................... 7-8
DOOR................................................................................................................................................................................... 7
DOOR SWITCH.................................................................................................................................................................... 7
FAN AND FAN MOTOR........................................................................................................................................................ 7
DEF' CONTROL ASM .......................................................................................................................................................... 8
LAMP.................................................................................................................................................................................... 8
ADJUSTMENT................................................................................................................................................................... 9-10
COMPRESSOR.................................................................................................................................................................... 9
PTC-STARTER..................................................................................................................................................................... 9
OLP (OVER LOAD PROTECTOR)..................................................................................................................................... 10
CIRCUIT DIAGRAM.............................................................................................................................................................. 10
TROUBLESHOOTING..................................................................................................................................................... 11-16
COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 11
PTC AND OLP.................................................................................................................................................................... 12
ANOTHER ELECTRIC COMPONENT............................................................................................................................... 13
SERVICE DIAGNOSIS CHART.......................................................................................................................................... 14
REFRIGERATING CYCLE............................................................................................................................................ 15-16
MICOM FUNCTION & PCB CIRCUIT EXPLANATION................................................................................................... 17-34
EXPLODED VIEW .......................................................................................................................................................... 35-38
REPLACEMENT PARTS LIST ............................................................................................................................................ 39-
Please read the following instructions before servicing your
refrigerator.
1. Check the set for electric losses.
2. Unplug prior to servcing 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
CONTENTS
- 2 -

- 17 -
ASSEMBLY JAWS
BOLT
TOOL
TUBE LOKRING LOKRING JOINT
Figure 23. LOKRING
Figure 24. LOKRING TOOL

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 m3or larger.
• Must be no-smoking area.
• No ignitable factors must be present.
Utilities
• Refrigerant cylinder (MAX NET 300g)
• Manometer
• Vacuum pump (600 L /min)
• Piercing Clamp
• Quick coupler
• Hoses (5m-1EA, 1m-3EA)
• LOKRING
• Portable Leakage detector (3g/year↓)
• 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 ASSY,
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 30min 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 30min in outside.
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 cycle that includes 3min of the pump
running->pump off->30sec of the compressor running.
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 N2gas 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).
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.
TO THE
VACUUM
PUMP
PRESSURE
GAUGE
Figure 3
WEIGH SCALE
THROTTLE
VALVE
COUPLE
REFRIGERANT
(R600a) CHARGING HOSE
Figure 4
FILLING OR
CHARGE TUBE VALVE TO BE OPENED WHEN REFILLING
VALVE TO BE CLOSED
AFTER VACUUM
TO THE VACUUM PUMP
TO THE
REFRIGERATION
SYSTEM
TO THE CHARGE
CYLINDER
Figure 5
SERVICING PRECAUTIONS
- 3 -
POINT TO BE
BROKEN CHARGE TUBE
EXTENSION
SCHRADER VALVE
(ONE-WAY VALVE)
LOKRING
SERVICE TUBE
EXTENSION
Figure 1 Figure 2

1.Ref. No: GR-399
2.Ref. No: GR-359
ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W) X 626(D) X 1880(H)
NET WEIGHT (kg) 74
COOLING SYSTEM Fan Cooling
REFRIGERATOR Knob Dial
FREEZER Button
Full Automatic
DEFROSTING SYSTEM Heater Defrost
DOOR FINISH Pre-Coated Metal
OUT CASE Painted Steel Sheet
INNER CASE ABS
INSULATION Polyurethane Foam
DEFROSTING DEVICE
Heater, Sheath & Heater, Cord-L
REFRIGERANT R600a(54g)
LUBRICATION OIL FREOL S10(280 cc)
TEMPERATURE
CONTROL
ITEMS SPECIFICATIONS
Transparent Shelf(3 EA)
REFRIGERATOR Vegetable Container(2 EA)
COMPARTMENT
Vegetable Container Cover(1 EA)
Chilled Container(1 EA)*
Dairy Pocket Cover(1 EA)
Egg Tray(2 EA)
DOOR POCKET Little Pocket(5 EA)
Bottle Pocket(1 EA)
FREEZER Tray Drawer(4 EA)
COMPARTMENT Ice Tray(1 EA)
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Side & Wire Condenser
SPECIFICATIONS
- 4 -
* Optional Parts
ITEMS SPECIFICATIONS
DIMENSIONS (mm) 595(W) X 626(D) X 1710(H)
NET WEIGHT (kg) 69
COOLING SYSTEM Fan Cooling
REFRIGERATOR Knob Dial
FREEZER Button
Full Automatic
DEFROSTING SYSTEM Heater Defrost
DOOR FINISH Pre-Coated Metal
OUT CASE Painted Steel Sheet
INNER CASE ABS
INSULATION Polyurethane Foam
DEFROSTING DEVICE
Heater, Sheath & Heater, Cord-L
REFRIGERANT R600a(54g)
LUBRICATION OIL FREOL S10(280 cc)
TEMPERATURE
CONTROL
ITEMS SPECIFICATIONS
Transparent Shelf(2 EA)
REFRIGERATOR Vegetable Container(2 EA)
COMPARTMENT
Vegetable Container Cover(1 EA)
Chilled Container(1 EA)*
Dairy Pocket Cover(1 EA)
Egg Tray(1 EA)
DOOR POCKET Little Pocket(3 EA)
Bottle Pocket(1 EA)
FREEZER Tray Drawer(4 EA)
COMPARTMENT Ice Tray(1 EA)
COMPRESSOR PTC Starting Type
EVAPORATOR Fin Tube Type
CONDENSER Side & Wire Condenser
* Optional Parts
or Vinyl Coated Metal
or Vinyl Coated Metal

NOTE : This is a basic model. The shape of refrigerator is subject to change.
PARTS IDENTIFICATION
- 5 -
Rotatable
Door Basket
(3 or 5)
Utility Corner
(movable)
Bottle Holder
2
L
Bottle
Door Basket
Leveling Screw
Egg Tray(1 or 2)
Freezer Temperature
Control
Removable
Glass Shelf(2 or 3)
Lamp
Multi-air Flow Duct
Fresh Meat Keeper
(Optional)
Refrigerator
Temperature Control
Vegetable Drawer
Used to keep fruits
and vegetables, etc.
fresh and crisp.
Ice Cube Tray
Freezer
Compartment
Removable
Plinth

1. PRECAUTION
1) Before reversing the door, first of all, you should take
out food and accessories like shelves or trays which are
not fixed in the refrigerator.
2) Use Torque Wrench or Spanner to fix or remove the bolt.
3) Don't lay the refrigerator down in working with it, it will
cause to get out of order.
4) Be careful not to drop the door in disassembling or
assembling the freezer or the refrigerator door.
2. HOW TO REVERSE THE DOORS
1) Seperate screw ➋and remove lower cover ➊and move
cap lower cover ➌. And, seperate screw ➍, lower hinge
➎, and remove pin ➏. Separating the freezer door in
opening, and more the position the cap ➐.
Move the position of bracket door ➑and screw ➒.
2) Separating screw and remove the center hinge
and the refrigerator door . Move the position of cap .
Move the position of bracket door and screw .
3) Move the position of upper hinge pin , and cap .
Assemble the refrigerator door . Assemble center
hinge and bolt . Assemble freezer door .
Assemble the lower hinge ➎, bolt ➍and lower cover ➊.
REPLACEMENT OF DOOR OPENING TYPE
- 6 -
21
7
2
3
1
21 4
6
5
8
9
14
15
12
11
5
4
21
10
2
1
12
13
10
11
16
17
1110
12
16 17
13
15
12
11 10 21
14

1 DOOR
● Freezer Door
1) Loosen 2 screws and pull the Lower Cover.
2) Loosen hexagonal bolts fixing the lower hinge to the
body to remove the freezer door only.
3) Pull out the Door Gasket to remover from the
Door Foam Assy, F.
●Refrigerator Door
1) Loosen hexagonal bolts fixing the center hinge(Hinge,C)
to the body to remove the refrigerator door only.
2) Pull out the Door Gasket to remove from the
Door Foam Assy, R.
2 DOOR SWITCH
1) Loosen four screws in upper part and disconnect top
cover.
2) Disconnect Lead Wire from switch.
3) Disengage hook behind the switch by pressing it with
hands.
3 REFRIGERATOR ROOM LAMP
1) Remove the Cover Lamp, R by pulling with a '–' type
driver.
2) Remove the Lamp by turning.
3) After removing the lamp, you must check
the O-RING, which is made by rubber and prevent
electric spark, in the socket.
Bolt
Lower Hinge
Figure 6
GASKET
Figure 7
Hinge, C
Bolt
Figure 8
Figure 9
DISASSEMBLY
- 7 -
Figure 10

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 Assy.
6) Losse 2 screw fixed to the Bracket.
7) Pull out Shroud, F remove the Fan Motor Assy.
8) Separate the Motor Bracket and Rubber.
5 DEFROST CONTROL ASSY
Defrost Control Assy 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 72°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
Assy and replace new one.
6 DAMPER CONTROL
1) Remove the Cover Lamp, R and loosen 2 screw.
2) Pull the Control Box, R and separate the lead wire
housing.
3) Remove the Cover Lamp, R.
4) Separate the Insulation Multi Duct and Control Box, R.
5) Disassemble the Knob.
6) Separate the Damper Control and Control Box, R.
7) Separate the Damper Control and Resistor.
8) Disconnect the lead wire.
7 HEATER, SHEATH & HEATER, CORD-L
In this refrigerator, Heater, Sheath & Heater, Cord-L are
used for defrosting heater. During heating, the temperature
of heater rises about 300~350°C. 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.
3) If the Heater, Cord-L is defected, disconnect the
connectors, and separate the Heater, Cord-L with
Long Nose.
4) Replace and assembly the Heater, Cord-L and connect
the connectors.
REFRIGERATOR ROOM LAMP
Heater, Sheath
Heater, Cord-L
GUIDE FANFAN
SHROUD FAN MOTOR
GRILLE
Thermister
Fuse, Melting
Figure 13
Figure 14
Figure 11
Figure 12
- 8 -

ADJUSTMENT
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 Assy (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 BaTiO3.
(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
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.
6) 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.
PTC STARTER HERMETIC
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
3M
S
S
PTC
OVERLOAD
PROTECTOR(O.L.P)
RSIR
RELAY ASSY
Figure 19
- 9 -

CIRCUIT DIAGRAM
- 10 -
NOTE : 1. This is a basic diagram and specifications vary in different localities.

1 COMPRESSOR AND ELECTRIC COMPONENTS
TROUBLESHOOTING (Mechanical Part)
- 11 -
1
2
3
4
5
2
5
5
3
4
5
5
1
43
YES
YES
NO
YES
YES
NO
NO
5
YES
NO
YES
Power
Source. Remove the Relay Assy from the Compressor
and measure the voltage
between Terminal C of
Compressor and
Terminals M or S of
Relay Assy
No Voltage.
(Rating Voltage
±10%)?
Replace
Relay Assy
Replace
Relay Assy
O.K.
Advise the customer
to use a regular
Trans.
Replace Compressor.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
Components start in
the voltage of Rating
Voltage ±10% below.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
Check the resistance of
two terminals in PTC-
Starter.
Check if applying
a regular OLP.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling the
PTC.
Check the
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
Check OLP.
Check
starting state.

2 RELAY ASSY (PTC AND OLP)
- 12 -
LN
T
32
2
M
C
SM
C
S
YES
NO
Normal operation of
Compressor is
impossible or poor. Separate the Relay Assy
from Compressor and
measure the resistance
between M and S with a
Tester or Whistone Bridge.
(Figure 21)
Separate the Relay Assy
from the Compressor and
check the resistance value
between two terminals of
OLP with a Tester.
(Figure 22)
Observation value is
220V/50Hz : 22Ω±30%
115V/60Hz : 6.8Ω±30%
240V/50Hz : 33Ω±30%
127, 220V/60Hz :
22Ω±30%
The resistance value is 0
or serveral hundreds Ω .
The value is ∞ .
Check another
electric components.
Replace Relay Assy.
Check another
electric
components.
Replace
Relay Assy.
Figure 21 Figure 22

3 ANOTHER ELECTRIC COMPONENTS
- 13 -
▼Cooling is impossible
Compressor
doesn't run.
Running state of
Compressor is poor. Check a starting voltage.
Check if current flows to
the following
components.
a. Thermistor
b. Starting devices
c. OLP
d. Compressor coil
e. Circuit Parts
Low voltage.
Poor contacting.
Shorted or broken.
Poor contacting
or shorted.
Coil shorted.
Poor contacting
or shorted.
Poor contacting
and broken.
Shorted.
Lack of capacity.
Coil of motor
Compressor. Replace the compressor.
Replace
each component.
Raise the voltage.
Replace
each component.
Cause.
Check if current flows
to starting devices.
Check current flowing
in sub-coil of
Compressor.
Check capacity of OLP.
The items described
above are normal.
▼ Cooling ability is poor
Fan motor
doesn't run.
Much frost are sticked
to the EVAPORATOR.
Poor contacting.
Coil is shorted.
Shorted.
Replace
the Heater, Sheath
Replace
the Heater, Cord-L
Defect on
Heater, Cord-L
Replace
each component.
Replace
each component.
Check current flowing
in SWITCH, DOOR.
Check current flowing in the
MOTOR[MECH], FAN.
Check current flowing
of the following
components.
• THERMISTOR
• FUSE, MELTING
Check current flowing
of the following
components.
• HEATER, SHEATH
• HEATER, CORD-L

4 SERVICE DIAGNOSIS CHART
COMPLAINT POINTS TO BE CHECKED REMEDY
Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet.
impossible. • Check if the power switch is set to OFF. • Set the switch to ON.
• Check if the fuse of power switch is shorted. • Replace a regular fuse.
• Measure the voltage of power outlet. • If voltage is low, wire newly.
Cooling ability • Check if the set is placed close to wall. • Place the set with the space of about 10cm.
is poor. • Check if the set is placed close to stove, gas • Place the set apart from these heat
• cooker and direct rays. • appliances.
• Is the ambient temperature high or • Make the ambient temperature below.
• the room door closed?
• Check if put in is hot. • Put in foods after cooled down.
• Did you open the door of the set too often • Don't open the door too often and close
• or check if the door is closed up? • it firmly.
• Check if the Damper Control is set to "cold-position". • Set the control to mid-position.
Foods in the • Is foods placed in cooling air outlet? • Place foods in high temperature section.
Refrigerator • (Front Part)
are frozen. • Check if the control is set to "cold-position". • Set the control to "mid-position".
• Is the ambient temperature below 5°C? • Set the control to "warm-position".
Dew or ice • Is liquid food stored? • Seal up liquid foods with wrap.
forms in the • Check if put in is hot. • Put in foods after cooled down.
chamber of • Did you open the door of the set too • Don't open the door too often and close
the set. • often or check if the door is closed up. • it firmly.
Dew forms • Check if ambient temperature and humidity • Wipe dew with a dry cloth. This occurrence
in the Exterior Case. of surroumcling air are high. • is solved naturally in low temperature and humidity.
• Is there gap in the door packed? • Fill up the gap.
Abnormal • Are the set positioned in a firm and even place? • Adjust the Adjust Screw, and position
noise generates. • in the firm place.
• Are any unnecessary objects set • Remove the objects.
• in the back side of the set?
• Check if the Tray Drip is not firmly fixed. • Fix it firmly on the original position.
• Check if the cover of mechanical room • Place the cover at the original position.
• in below and front side is taken out.
To close the door • Check if the door packing is dirty • Clean the door packing.
is not handy. • with filth such as juice.
• Is the set positioned in a firm and even place? • Position in the firm place and adjust the
• Adjust Screw.
• Is too much food putted in the set? • Keep foods not to reach the door.
Ice and foods • Check if the inside of the set is dirty. • Clean the inside of the set.
smell unpleasant. • Did you keep smelly foods without wrapping? • Wrap smelly foods.
• It smells of plastic. • 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.
Replace the
Components of
defrosting circuit.
Check Refrigerating
Cycle.
Check the
Damper Control
Defrosting
is poor.
The cycle
is faulty. Repair the cycle.
Replace the
Damper Control
The operation of
the Damper
Control is poor.
- 14 -

5 REFRIGERATING CYCLE
▼Troubleshooting Chart
▼Leakage Detection
● Observe discharging point of refrigerant which may be in the oil discharging part in the compressor and hole of evaporator.
- 15 -
YES
YES
Whether Compressor
runs or not.
Whether frost
forms or not in
Evaporator.
Observe the discharged
amount of Refrigerant.
Inject Refrigerant to Compressor
and check cooling operation.
Clogged by dust. Gas leakage.
Faulty
Compressor.
Moisture Clog.
Whether oil
leaks or not.
Frost formed normally
Normal amount
No or much amount
(Check the leakage point)
Frost formed normally
No frost
or forms
in inlet only
Check Compressor
PARTIAL Freezer room and Low flowing sound of A little high • A little Refrigerant
LEAKAGE Refrigerator Refrigerant is heard and more than • discharges.
don't cool frost forms in inlet only ambient • Normal cooling is possible
normally. temperature. • when injecting of Refrigerant
• the regular amount.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient • No discharging of Refrigerant.
LEAKAGE Refrigerator is not heard and frost isn't temperature. • Normal cooling is possible
don't cool formed. • when injecting of Refrigerant
normally. • the regular amount.
PARTIAL Freeze room and Flowing sound of Refrigerant A little high • Normal discharging of
CLOG Refrigerator is heard and frost forms more than • refrigerant.
don't cool in inlet only. ambient • The capillary tube is faulty.
normally. temperature.
WHOLE Freezer room and Flowing sound of Refrigerant Equal to ambient • Normal discharging of
CLOG Refrigerator is not heard and frost isn't temperature. • Refrigerant.
don't cool. formed.
MOISTURE Cooling operation Flowing sound of Refrigerant Low than • Cooling operation restarts
CLOG stops periodically. is not heard and frost melts. ambient • when heating the inlet of
temperature • capillary tube.
COMP- Freezer and Low flowing sound of A little high • The pressure of high
RESSION Refrigerator Refrigerant is heard and than ambient • pressure part in
don't cool. frost forms in inlet only. temperature. • compressor is low.
NO COMP- No compressing Flowing sound of Refrigerant Equal to ambient • No pressure of high pressure
RESSION operation. is not heard and no frost. temperature. • part in the compressor.
CAUSE TEMPERATURE
OF THE
COMPRESSOR REMARKS
STATE OF
THE SET STATE OF THE EVAPORATOR
LEAKAGE
CLOGGED BY DUST
DEFECTIVE
COMPRESSION

NO. ITEMS CONTENTS AND SPECIFICATIONS REMARKS
WELDING (1) H 30
ROD (1) • Chemical Ingredients • Recommend H34 containing 34% Ag in the
(1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Service Center.
(1) • Brazing Temperature: 710~840°C
(2) Bcup-2
(1) • Chemical Ingredients
(1) • Cu: About 93%
(1) • P: 6.8~7.5%
(1) • The rest: within 0.2%
(1) • Brazing Temperature: 735~840°C
FLUX (1) • Ingredients and how to make • Make amount for only day. (1)
(1) ••Borax 30% • Holding period: 1 day
(1) ••Borax 35% • Close the cover of container to prevent dust
(1) • Fluoridation kalium: 35% • putting in the FLUX.
(1) • Water: 4% • Keep it in a stainless steel container.
(1) • Mix the above ingredients and boil until
(1) • they are transformed into liquid.
LOKRING (1) Both of the tube is inserted up to the stop. • For a hermetically sealed metal/metal
(Figure 23,24) (2)
Both of the LOKRING is pushed up to the stop connection, the tube ends have to be clean.
(3)
The bending point is not too close to the • LOKPREP is distributed all of out-surface of
joint ending. • the tube ends.
(4) During the assembly it is important that
both ends remain completely within the
joint.
DRIER (1) Assemble the drier within 30min. • Don't keep the drier in a outdoors because
ASM (1) after unpacking. • humidity damages to it.
(2) Keep the unpacked drier at the temperature
of 80~100°C.
VACUUM (1) When measuring with pirant Vacuum • Apply M/C Vacuum Gauge without fail.
(1 )gauge the charging M/C, vacuum • Perform vacuum operation until a proper
(1 )degree is within 1 Torr. • vacuum degree is built up.
(2) If the vacuum degree of the cycle inside is • If a proper vacuum degree isn't built up,•
(2) 10 Torr. below for low pressure and 20 Torr. • check the leakage from
(2) for high pressure, it says no vacuum • the Cycle Pipe line part and
(2) leakage state. • Quick Coupler Connecting part.
(3) Vacuum degree of vacuum pump must be
(3) 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.
(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/cm2also
when substituting dry air for Nitrogen Gas.
NIPPLE (1) Check if gas leaks with soapy water. • Check if gas leaks from joint of the
AND (2) Replace Quick Coupler in case of leakage. • Coupler.
COUPLER
PIPE (1)• Put all Joint Pipes in a clean box and
(1)• cover tightly with the lid so that dust or
(1)• humidity is not inserted.
1
2
3
4
5
6
7
8
DRY AND
AIR
NITROGEN
GAS
▼General Control of Refrigerating Cycle
- 16 -

NOTCH
TEMP(˚C)
ROOM
Min Min/
Mid Mid Mid/ Max Max
-15 -16.5 -18 -19.5
FREEZER
VACATION FREEZE TEMP QUICK FREEZE
-22
This description is made for GR-349, 389SQ. Please refer to overall PCB circuits for other models.
1 FUNCTION EXPOSITION
1) FUNCTION
(1) The refrigerator starts from optimum condition when electric power is first on. But the operation condition changes "Mid"
➝"Mid/Max" ➝"Max" ➝"Min" ➝"Min/Mid" ➝"Mid" whenever pressing the FREEZE TEMP button.
(2) It returns to "Mid" conditions if power off and on again.
MICOM FUNCTION & PCB CIRCUIT EXPLANATION
- 18 -
2) QUICK FREEZER
(1) Function to raise the freezing speed by operating the COMP successively. As pressing the QUICK FREEZE button, the
QUICK FREEZE LED is displayed. Then after 3 hours' successive operation of COMP, the QUICK FREEZING function
will be released.
(2) Defrosting During the QUICK FREEZING operates as follow.
When the QUICK FREEZING time is below 90 minutes, defrost and then operate the QUICK FREEZING for the
remaining time. When the QUICK FREEZING time is over 90 minutes, defrost and then operate the QUICK FREEZING
for 2 hours
(3) If QUICK FREEZE button is pressed during defrosting, the QUICK FREEZE LED is lit up. But the QUICK FREEZING
operates for 3 hours after 7 minutes from the end of defrosting.
(4) If VACATION button is pressed during the QUICK FREEZING, the QUICK FREEZING LED function is released.
(5) If power off during the QUICK FREEZING and power on again, the QUICK FREEZING function is released.
3) VACATION FUNCTION
(1) Function for Energy Saving. As pressing the VACATION button, the VACATION LED is displayed and this function is
operated.
(2) Freezer Compartment is not kept by compressor at the notch displayed but at -13°C± differential.
(3) Defrosting and Fan control is same as normal operation.
(4) If QUICK FREEZE button is pressed during the VACATION FUNCTION, VACATION FUNCTION is released.
(5) If power off during the VACATION FUNCTION and power on again, the VACATION FUNCTION is released.

4) DOOR OPENING ALARM
(1) When the REFRIGERATOR DOOR is opened and won't be closed after 1 minute from the its opened, BUZZER sounds
to notify it.
(2) At frist, BUZZER sounds three times at each intervals of 0.5 second. Then makes a 0.5 second ON/OFF alarm three
times at intervals of 30 seconds.
(3) If the REFRIGERATOR door closed during ALARM, it is released.
5) DISPLAY BUTTON RING
(1) If display function button(FREEZE TEMP, QUICK FREEZE, VACATION) of the front of the TOP COVER is pushed,
BUZZER rings with "DING~ DONG~"(See the BUZZER OPERATION CHECK)
6) DEFROSTING
(1) If the accumulated time for the operation of the COMPRESSOR is meet with 7 hours, the DEFROSTING HEATER is
started.
(2) The first defrosting is performed at 4 hours(compressor ON) later since the power is on.
(3) If DEFROST SENSOR is over 7°C during DEFROSTING, end the operation of DEFROSTING with DEFROSTING
HEATER paused, And after 7 minutes, the operation for the freezing is started.
But, if DEFROST SENSOR is not reach to 7°C after 2 hours' operation of the defrosting heater, it represents a defrosting
trouble.(See the TROUBLE REPRESENTING FUNCTION)
(4) If DEFROST SENSOR is short or open, defrosting is not performed.
7) ORDERLY OPERATION OF ELECTRIC PARTS
To avoid NOISE and DAMAGE, the items containing an electric parts such as COMP, DEFROSTING HEATER and FAN
MOTOR operate in order as follows.
- 19 -
CLOSE OPEN CLOSE OPEN CLOSE
BUZZER
within
1 minute 1 minute 30 seconds 30 seconds
three
times three times three times
REFRIGERATOR
DOOR
OPERATION STATE OPERATION ORDER
WHEN DEFROST SENSOR
TEMPERATURE IS OVER
7°C. (WHEN PURCHASING
OR MOVING)
WHEN DEFROST SENSOR
TEMPERATURE IS BELOW
7°C. (WHEN POWER
FAILURE OR SERVICING)
WHEN RETURNING TO NORMAL
STATE FROM TEST MODE
POWER after 0.5 sec. COMP after 0.5 sec. FAN
ON ON ON
All Elec. Parts after 7 min . COMP after 0.5 sec. FAN
OFF ON ON
POWER after 0.5 sec. DEFROSTING after 10 sec. DEFROSTING
ON HEATER ON HEATER ON
after 0.5 sec. COMP after 0.5 sec. FAN
ON ON
WHEN PLUGGED AT FIRST

8) SELF-TEST
(1) Function to make service easy in case of occuring a trouble in the product.
(2) When occurring a trouble, if the button is pushed, but the function could not operate.
(3) If a toruble release during the representation of trouble, a refrigerator performs the normal function(RESET).
(4) To represent a ERROR CODE, it use FREEZE TEMP LEDs on TOP COVER. If ERROR occurs, the other LEDs except
ERROR CODE LEDs are all off.
ERROR CODE LEDs
OPERATION IN TROUBLE'S OCCURRING
NO. ITEMS F1 F2 F3 F4 DESCRIPTION COMP FAN
DEFROST HEATER
1 FREEZER FREEZER SENSOR open
SENSOR abnormal or short.
OO
2 DEFROST
DEFROST SENSOR open
SENSOR abnormal or short.
O O No defrosting
3
DEFROSTING DEFROST HEATER,
FUNCTION TEMP. FUSE open or
is abnormal disconnection (Displayed
after at least 4 hours OOO
from the trouble's
occurring.)
4
RT-SENSOR NOTE 1) Room Temperature
abnormal SENSOR open or short OOO
- 20 -
VACATION FREEZE TEMP QUICK FREEZE
F1
ERROR CODE LEDs
F2 F3 F4
15 minutes On/
15 minutes Off
* NOTE 1) If one second pass after pressing the QUICK FREEZE and FREEZE TEMP buttons togather in normal operation,
operates as follow. If normal, LEDs on the TOP COVER is all on.
If abnormal, LEDs are all on except VACATION LED.
RT-SENSOR
:ON
O : OPERATE NORMAL :OFF