LG GL-S392DM User manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL
SERVICE MANUAL
Icebeam
Door Cooling
E L E C T R O N I C
REFRIGERATOR
MODEL : GL/GR- S392DM
GL/GR- S432DM

- 2 -
CONTENTS.............................................................................................................................................................................2
SERVICING PRECAUTIONS..................................................................................................................................................3
SPECIFICATIONS...................................................................................................................................................................4
PARTS IDENTIFICATION.......................................................................................................................................................5
DISASSEMBLY....................................................................................................................................................................6-7
DOOR...................................................................................................................................................................................6
DOOR SWITCH.................................................................................................................... ................................................6
FAN AND FAN MOTOR.............................................................................................................. ..........................................6
DEF' CONTROLASM............................................................................................................... ...........................................7
LAMP....................................................................................................................................................................................7
CONTROL BOX-R................................................................................................................................................................7
ADJUSTMENT.....................................................................................................................................................................8-9
COMPRESSOR....................................................................................................................................................................8
PTC-STARTER.....................................................................................................................................................................8
OLP (OVER LOAD PROTECT OR).......................................................................................................................................9
CIRCUIT DIAGRAM................................................................................................................................................................9
TROUBLESHOOTING.....................................................................................................................................................10-15
COMPRESSOR AND ELECTRIC COMPONENTS............................................................................................. ..............10
PTC AND OLP.................................................................................................................... ................................................11
OTHER ELECTRIC COMPONENT..................................................................................................... ..........................12
SERVICE DIAGNOSIS CHART........................................................................................................ ..................................13
REFRIGERATING CYCLE............................................................................................................ ................................14-15
DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM..................................................................................... ...........16-37
EXPLODED VIEW & REPLACEMENT PARTS LIST.............................................................................................................38
Please read the followings before servicing your refrigerator.
1. Check if an electric leakage occurs in the set.
2. To prevent electric shock, unplug prior to servicing.
3. In case of testing with power on, wear rubber gloves to
prevent electric shock.
4. If you use any appliances, check regular current, voltage
and capacity.
5. Don't touch metal products in cold freezer with wet hand .
It may cause frostbite.
6. Prevent water flowing to electric elements in mechanical
parts.
7. When you stand up during observing the lower part
with the upper door open, move with care to prevent
head wound which may happen by hitting the upper
door.
8. When sloping the set, remove any materials on the set,
especially thin plate type. (ex.: glass shelf or books.)
9. When servicing evaporator part, wear cotton gloves
without fail. It is to prevent wound by sharp fin of
evaporator.
10. Leave a breakage of refrigerating cycle to a heavy
service center. The gas in cycle inside may soil
ambient air.
SAFETY PRECAUTIONS
CONTENTS
DEFROST TIMER............................................................................................................... ................................................11

POINT TO BE BROKEN CHARGE TUBE
EXTENSION FEMALE
HANSEN
MALE HANSEN
SOLDERING POINTSERVICE TUBE EXTENSION
Figure 1 Figure 2
TO THE
VACUUM
PUMP
PRESSURE
GAUGE
Figure 3
TO THE R-134a CYLINDER
TO THE REFRIGERATION
SYSTEM Figure 4
FILLING OR
CHARGE TUBE VALVE TO BE OPENED WHEN REFILLING
VALVE TO BE CL OSED
AFTER VACUUM
TO THE
VACUUM
PUMP
TO THE REFRIGERATION
SYSTEM TO THE CHARGE CYLINDER
Figure 5
- 3 -
RECHARGING IN COMPRESSOR
Test the refrigeration system by connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible R134a residue by breaking off the
end of the extension piece at its narrow point. (Figure 1)
Replace the filter and any damaged components. Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension completely with male
Hansen and at last, solder it to the same tube again (Figure 2)
It is necessary to execute the soldering operation with
valve open so that the fumes caused by oil residue can
come out freely without blowholes between two tubes
during the heating of the point to be soldered.
The extension fitted with the male Hansen is connected to
the female fitting of the vacuum pump tube. (Figure 3)
Air evacuating from the system begins as soon as the
pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge
indicates vacuum (0 absolute, -1 atm., -760 Hg) in any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
In case that a considerable leakage occurs it will be
necessary to stop the vacuum pump and to add a small
quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge can't fall to 1 atmosphere), start
the refrigeration unit and find the leakage with the special
leak-finder. When the defective soldering point is visible,
re-do it after opening the extension tube valve and
reestablishing the normal outside pressure inside the
group.
Because the melted alloy is sucked into the tubes and
block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the
vacuum operation is over, add the quantity in grams of
R134a to the refrigeration system. Remember that
every system has an exact quantity of R134a with a
tolerance of ±5 grams that can be added. (Figure 4)
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.
(Figure 5)
In addition, check the graduated scale on the cylinder for
the quantity of R134a to be added, for example, if we
have 750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached when
R134a has dropped to 585 grams, remembering that
the indicator shows a lower limit of meniscus. Do this after
choosing the scale corresponding to the gas pressure
different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.
To make R134a flow into the system, open the valve
placed at the base of the cylinder and connected to the
filling tube. The amount of Freon cannot be added to the
system all at once because it may cause a blocking of motor-
compessor. Therefore, proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.
The pressure rises and the motor compressor must start
sucking the gas and lowering the pressure again. Regulate
the valve again, maintaining the same manner until
reaching to the quantity of R134a established for the
system being charged. When the system is running, the
suction pressure must be stablized between 0.30 to
0.6 atmosphere.
SERVICING PRECAUTIONS
- 3 -

GL-S392DM GL-S432DM
GR-S392DM GR-S432D M
1. SPECIFICATIONS
- 4 -
PCM PCM
Width 640 640
Height 1680 1832
Depth 730 730
Weight(Kg) 69 73
NetDimension (mm)
Model Number
SPECIFICATION
Display Electronic
Internal
Icebeam Door Cooling
Door Cooling
Memory Back-up
Super Cool
Key & Lock
Castors 4 4
Multi-Flow
Z4 Flow
Shelf Crystal
Transparent
2 ltr Bottle Storage
Tray Fresh Room
Lamp Normal One One
Humidity Controller
Deodoriser
FIR Lamp
Egg Tray Wire
Transparent
Triple Twist Ice Tray
PCM
Super Inox, Super White, Bright Silver
Delta Type
Compressor P.T.C. Starting Type
General features Temp. Control
Temp. function
Refrigerator Compartment Air Flow
Door Basket
Fresh Zone
Vegetable Tray
Freezer Compartment Shelf
Door Basket
Ice Maker
Miscellenous
External Door Finish
Handle
No No
Fuzzy Logic
Normal
350 390
Gross Capacity (Lit)

- 5 -
FREEZER
COMPARTMENT
Leveling Leg
Freezer Temperature
Control Dial
Moisture
Controller
Maintains
humidity
inside tray
vegetable for
lasting freshness
of vegetable
and fruits.
Multi Utility
Basket
Deco Duct,
Door Cooling
(Optional)
Door Cooling
helps in Cooling
the refrigerator
compartment
faster &
maintains
uniform
temperature
inside.
Egg
Storage
Shelf
Freezer
Door
Basket
Freezer Lamp (optional)
Freezer Shelf
Triple Twist
Ice Trays
Bank Ice
Utility Box
(optional)
Door Tray
Fresh Room
Tray Fresh Room
Temperature
Sensor
Refrigerator
Temperature
Control Dial
Side Cooling
(optional)
Normal
Lamp
F.I.R. Lamp
(optional)
Shelves
Tray Vegetable (Used to keep fruits and
vegetables, etc. fresh and crisp.)
Cover Lower (optional)
De-odorizer
(optional)
Door Switch
REFRIGERATOR
COMPARTMENT
Door
Baskets
555555444444666666
SUPER COOL
COLD COLDEST
1. PARTS IDENTIFICATION

- 6 -
555555444444666666
1. Remove the freezer shelf assembly.
2. Loosen 1 cap screw fixing the Grille Fan.
3. Pull out the Grille Fan and Shroud-F.
3. DISASSEMBLY
l Freezer Door
3-1 DOOR
1. Remove the hinge cover by pulling it upwards .
2. Loosen hexagonal bolts fixing the upper hinge to the
body and lift the freezer door.
3-2 DOOR SWITCH
1. To remove the door switch, pull out it with a '—’ type
driver as shown in (Figure 9).
2. Disconnect the lead wire from the switch.
2. Pull out the door gasket to remove from the door foam
Ass'y
Figure 11
CAP
Figure 9
3-3 SENSOR & DISPLAY PCB
1. Remove the cover Lamp-R by the use of ‘—’ type driver
inserting in the low holes of the cover.
2. Loose 2 screw.
3. Pull the Control Box-R.
4. Disconnect the Housing of lead wire.
5. Separate the INSU’Multi Duct and Control Box-R.
6. Remove the cotton tape and foam PU.
7. Disconnect the lead wire.
8. Separate the sensor & display PCB
3. Pull out the door gasket to remove from the door foam
Ass'y.
l Refrigerator Door
1. Loosen hexagonal bolts fixing the lower hinge to the
body to remove the refrigerator door only.
3-4 FAN AND FAN MOTOR
SENSOR
DISPLAY PCB
CONT’ BOX-R
COVER LAMP-R
INSU’ MUL TI DUCT
Figure 8
BOLT
LOWER HINGE

DEF CONTROLASSY
D-SENSOR
- 7 -
6.
7.
8.
9.
10.
Disconnect the housing of lead wire.
Separate the Fan Assy.
Loose 2 screw fixed to the Bracket.
Pull out Shroud-F remove the Fan Motor Assy.
Separate the Motor Bracket and Rubber.
3-6 REFRIGERATOR ROOM LAMP
1. Remove the cover lamp-R by pulling with a (-)' type
driver.
2. Remove the lamp , vacuum & lamp , FIR by turning.
3-7 CONTROL BOX-R
1. Remove the Cover Lamp-R. by pulling with a (-) type driver
3-5 DEF' CONTROL ASSY
Def control Assy consists of Defrost Thermostat and FUSE-M
Defrost Thermostat functions to defrost automatically and it
is attached to metal side of the Evaporator and senses
Temp.
Fuse-M is a kind of safety device for preventing over-
heating of the Heater when defrosting.
At the temperature of 77°C, it stops the emission of heat
from the heater.
1.
2. Pull out the Shroud after removing the Grille. Separate the connector connected with the Def Control
Assy and replace the Def Control Assy after cutting the
Tie Wrap and removing the Holder Fuse. (Figure 14)
2.
3.
4.
Loosen 2 screws.
Pull the Control Box-R.
Separate the lead wire Housing.
Figure 16
CONTROL BOX-R
COVER LAMP
Figure 15
REFRIGERATOR ROOM LAMP
SHROUD-F
Figure 13 Figure 14
FAN
Figure 12
FAN MOTOR
SHROUD
GRILLE
BRACKETFAN

- 8 -
4-1 COMPRESSOR
4-1-1 Role
The compressor inhales 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.
4-1-2 Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load
Protector (OLP) in the Compressor outside.
On the other
hand, because the Compressor consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
4-1-3 Note to Use
(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, poor operation and poor contact
may cause.
(5) Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is no-contact
semiconductor starting device which uses ceramic
material and the material consists of BaTiO3.
(2) The higher the temperature is, the higher resistance
value becomes . These features are used as starting
device of Motor.
4-2-2 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 single-
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
4-2-3 PTC-Applied Circuit Diagram
• According to Starting Method of Motor
4-2-4 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 Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after power off, Motor
can't operate again .
4-2-5 Relation of PTC-Starter and OLP
(1) If power off during operation of Compressor and power
on before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only 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 proper fixed OLP
without fail.
4-2-6 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 inflows into PTC,
PTC materials it may break due to insulation
breakdown of material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
(5) Use a properly fixed PTC.
4. ADJUSTMENT
PTC STARTER HERMETIC
TERMINAL
COMPRESSOR
MOTOR
C
M
SM
36
5
SSSSSS
PTC
OVERLOAD PROTECT OR
RSCR Figure 17

- 9 -
5. CIRCUIT DIAGRAM
4-3 OLP (OVER LOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVER LOAD PROTECT OR) is attached to
Hermetic Compressor and protects Motor by cutting off
current in Compressor Motor by Bimetal in the OLP in
case of over-rising temperature.
(2) When over-voltage flows to Compressor motor, Bimetal
works by heating the heater inside OLP,
and OLP protects Motor by cutting off current which
flows to Compressor Motor.
4-3-2 Role of OLP
(1) OLP is attached to Hermetic Compressor used to
Refrigerator and Show Case and prevents Motor Coil
from being started in the Compressor.
(2) Do not turn the Adjust Screw of OLP in any way for
normal operation of OLP.
(Composition and connection Diagram of OLP)
CONTACTING
POINT COVER
BIMETAL
CONTACTING
POINT
HEATER
TERMINALS
ADJUST
SCREW
HEATER
BIMETAL
Figure 18
CIRCUIT DIAGRAM
PWB,ASSY MAIN
DISPLAY

6. TROUBLESHOOTING
- 10 -
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1
2
3
4
5
2
5
5
3
5
4
5
5
1
43
YES
YES
YES
YES
NO
NO
YES YES
YES
NO
NO
NO
Power Source. Remove the PTC-Starter
from the Compressor
and measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
No Voltage.
(Rating Voltage
±10%)?
Replace OLP.
Reconnect.
Replace
PTC-Starter.
Replace OLP.
O.K.
Check connection
condition.
OLP disconnected?
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
Compressor.
Motor
Check the
resistance of
PTC-Starter.
Check OLP.
Check
starting state.

- 11 -
6-2 PTC AND OLP
65
3
4
YES
NO
Normal operation of
Compressor is
impossible or poor.
Separate the PTC from
Compressor and
measure the resistance
between No. 5 and 6
(only RSIR Type) or No.
4 and 5 of PTC with a
Tester or Whistone
Bridge. (Figure 19)
Separate the OLP
from Compressor and
check resistance
value between two
terminals of OLP with
a Tester. (Figure 20)
Observation value is
220V/50Hz : 22 ±30%
115V/60Hz : 6.8 ±30%
240V/50Hz : 33 ±30%
127, 220V/60Hz :
22 ±30%
The resistance value is
0 or several
hundreds.
The value is .
Check another
electric components .
Replace OLP.
Check another
electric components .
Replace
PTC.
Figure 20
Figure 19
W
W
W
W

- 12 -
6-3 OTHER ELECTRIC COMPONENTS
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
Low voltage.
Poor contacting or
shorted.
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. Poor contacting.
Coil is shorted.
Shorted.
Replace
each component .
Replace
each component .
Check current flowing
of the door S/W.
Check current flowing
in the Fan Motor.
Check current flowing
of the following
components.
• Def. Sensor
Check current flowing
of the following
components.
• L-CORD, TE-PLATE
HEATER
e. Circuit Parts
Check the Sensor Poor contacting
or shorted.
Much frost are sticked
to the EVAPORATOR. Replace
each component .

- 13 -
(3 LEDs are on)
6-4 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 S/W is set to OFF. • Set the switch to ON.
• Check if the fuse of power S/W 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 the room door
closed?
• Check if putting in hot foods . • Put in foods after they get cold.
• 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 Control is set to "Cold”.
Foods in the • Are foods placed in cooling air outlet? • Place foods in high temperature section .
Refrigerator (Front Part)
are frozen. • Check if the Display LED is set to "Coldest”.
• Is the ambient temperature below 5°C? • Set the Display LED to "Cold”.
Dew or ice • Is watery foods kept? • Seal up watery foods with wrap.
forms in the • Check if putting in hot foods . • Put in foods after they get cold.
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 happening
in the Out Case. of surroumcling air are high. is solved in low temperature and humidity
naturally.
• Is the gap in the door packed? • Fill up the gap.
Abnormal • Is the set positioned in a firm and even place? • Adjust the Adjust Screw, and position
noise generates. in the firm place.
• Does any unnecessary objects exist • Remove the objects.
in the back side of the set?
• Check if the Drip Tray is not firmly fixed. • Fix it firmly on an original position.
To close the door • Check if the door packing becomes dirty • Clean the door packing .
is not handy. • 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 becomes dirty. • Clean the inside of the set.
smell unpleasant. • Did you keep smelly foods without wraping? • Wrap smelly foods.
• It smells plastic. • The new products smell plastic, but it is
removed after 1-2 weeks.
Check if dew forms
in the Freezer. Replace the
Components of
defrosting circuit.
Check Refrigerating
Cycle.
Check the
Sensor
Defrosting is poor.
The cycle is faulty. Repair the cycle.
Replace the
Sensor
The operation of the
Sensor is poor.
In addition to the items described left, refer to the followings to solve the complaint.
• Set the Display LED to "Mid".
• Make the ambient temperature below.
• Set the control to mid-position. (3LEDs are on)

- 14 -
6-5 REFRIGERATING CYCLE
Troubleshooting Chart
Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not. Whether frost
forms or not in
Evaporator.
Observe the discharging
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.
Normal formed frost
Normal amount
No or much amount
(Check the leakage point)
Normal formed
frost in Evaporator
No frost or forms
in inlet only
Check Comprossor
PARTIAL Freezer and Low flowing sound of A little high • A little Refrigerant
LEAKAGE Refrigerator Refrigerant is heard and more than • discharges.
don't get cold frost forms in inlet only ambient • Normal cooling is possible
normally. temperature. • when injecting Refrigerant
• of regular amount.
WHOLE Freezer 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 get cold formed. • when injecting Refrigerant
at all. • of 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 get cold in inlet only. ambient • The capillary tube is faulty.
normally. temperature.
WHOLE Freezer and Flowing sound of Refrigerant Equal to ambient • Normal discharging of
CLOG Refrigerator is not heard and frost isn't temperature. • Refrigerant.
don't get cold. 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 get cold. 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 compressor.
CAUSE TEMPERATURE
OF THE
COMPRESSOR REMARKS
STATE OF
THE SET STATE OF THE EVAPORATOR
LEAKAGE
CLOGGED BY DUST
DEFECTIVE
COMPRESSION

- 15 -
NO. ITEMS CONTENTS AND SPECIFICATIONS REMARKS
WELDING (1) H 30
ROD • Chemical Ingredients • Recommend H34 containing 34%Ag in the
Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% Service Center.
• 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
FLUX • Ingredients and how to make • Make amount for only a day.
Borax 30% Holding period: 1 day
Borax 35% • Close the cover of container to prevent dust
Fluoridation kalium: 35% putting in the FLUX.
Water: 4% • Keep it in a stainless steel container.
Mix the above ingredients and boil until
they are transformed into liquid.
DRIER (1) Assemble the drier within 30min. • Don't keep the drier in a outdoor because
ASM 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 .
gauge of charging M/C , vacuum • Perform vacuum operation until a proper
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 ,
10 Torr. below for low pressure and 20 Torr. check the leakage from
for high pressure, it says no vacuum the Cycle Pipe line part and
leakage state. Quick Coupler Connecting part.
(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.
(1) The pressure of dry air must be more
than 12~16Kg/cm2
(2) Temperature must be more than
-20~-70°C.
(3) Keep the pressure to 12~6Kg/cm2also
when substituting dry air for Nitrogen Gas.
NIPPLE (1) Check if gas leaks with soapy water. • Check if gas leaks from connecting part of
AND (2) Replace Quick Coupler in case of leakage. Coupler.
COUPLER
PIPE • Put all Joint Pipe in a clean box and
cover tightly with the lid so that dust or
humidity is not inserted.
1
2
3
4
5
6
7
DRYAND
AIR
NITROGEN
GAS
General Control of Refrigerating Cycle

- 16 -
7-1 FUNCTION
7-1-1 FUNCTION
7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
Temp Medium / Medium /
Control Low Low
Medium
High High
TEMP(ºC)
ROOM REFRIGERATOR
5 2 6 3 0
SUPER COOL
COLD COLDEST
1. When the appliance is plugged in , it is set to ‘Normal’(3 LEDs are on).As we press the button LEDs glow
from cold to coldest.
2. When the power is initially applied or restored after a power failure, it is automatically restored the previous
settings because a Memory Back-up is provided for all settings.

- 17 -
7-1-2 SUPER COOL
1. This feature is to shorten the cooling time of the refrigerator by keeping the comp , fan running for a while. When the
Super Cool button is pushed, the Super Cool LED turns on in order and the comp keeps on running. In 2 hours, the
Super Cool mode will be cleared . For latter settings, LED continue to glow for half hour mode, though internally the
machine behaves at previous refrigerator notch value .
2. When the Defrosting mode starts while in the Super Cool mode, defrosting is performed. After that, the Super Cool mode
resumes for the remaining time.
3. When the Super Cool button is pushed while in the Defrosting mode, the Super Cool mode starts in 7 minutes after the
completion of the defrosting even though the Super Cool LED turns on.
4. If a power failure occurs while in the Super Cool mode, the Super Cool mode will be cancelled when the power is
restored.
5. If the Super Cool mode is selected when it has not passed 7 minutes since the comp stopped , the comp will start running
after the remaining time elapses.
7-1-3 CONTROL OF COOLING FAN IN THE FREEZER COMPARTMENT
1. A fan motor in the freezer compartment is provided which operate continuously as long as compressor
operates.
2. The fan motor is stoped as compressor stoped.
7-1-4 DEFROSTING
1. The defrosting is performed each time when the total running time of the compressor reaches 8 hours .
2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the
compressor reaches 4 hours.
3. When the temperature of the defrosting sensor reaches 13 °C or above, the defrosting stops. If the temperature does not
reach 13 °C in 2 hours after the defrosting starts, machine will come out of defrost cycle and report defrost failure .
(Refer to 7-1-10. Error Diagnostic Mode.)
4. With the defective defrosting sensor (cut or short-circuited wire), the defrosting will not be performed.
7-1-5 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS
The electric components, such as the comp, defrosting heater , and cooling fan , start sequentially to avoid the noise and
damage to the part , which may result from the simultaneous start of various components on turning the power on or after
the completion of a test .
Condition of Operation Operating Sequence
If refrigerator compartment
temperature is sensed greater
than 25°C (First time plugged;
long time disconnected and
plug again)
If refrigerator compartment
temperature is sensed lower
than 25°C and unplugged
the refrigerator and plug
again for test defrost on line
production ir service.
When returned from the Test mode
POWER in 0.5 sec COMP in 0.5 sec COOLING FAN
ON ON ON
ALL LOADS in 7 min COMP in 0.5 sec COOLING FAN
OFF ON ON
POWER in 0.5 sec DEFROSTING in 10 sec DEFROSTING
ON HEATER ON HEATER OFF
in 0.5 sec COMP in 0.5 sec COOLING FAN
ON ON
When the power is turned on

- 18 -
7-1-6 ERROR MODE INDICATION :
Error Code
display
#
1
2
3
Item
Faulty R sensor The R. sensor is open
or short circuit
Faulty D sensor The D. sensor is open
or short circuit.
Defrost problem
The defrost time is >2
hrs and the temperature
0
is not 13c in
evaporator area.
Defect
Information
Operation with Error
Comp DF
Heater
15 Min ON/
15 Min OFF
No Defrost
R1 R2 R3 R4
R1 R2 R3 R4
ON
Off
Operate Normal
TEMP
COLD COLDEST
SUPER
COOL

- 19 -
ERRORS EXPLANATION
1. When 2 error are present at the same time, the Micom only shows one on display.
2. When fix all error the Micom reset the refrigeratorand work normally at Last Notch.
No backup for super cool.
3. During the error, Switch does not work, Setting change not possible.However the
Key recognition beep sounds.
4. When the Refrigerator is in test mode and one error occur at that moment , the
Micom finish the test Mode.
5. If the Refrigerator is working at Max/Mid/min. Notchand one error occurs .
When the problem is solved, the Micom reset the refrigerator to start work at the
Max/Mid/Min. Notch resp.
Power ON Comp.
and FAN
ON
0.5 sec.
Power ON Electric.
heater
ON
0.5 sec.
Electric
heater
OFF
Comp.
and FAN
ON
10 sec
0.5 sec.
SequenceFunction
R Temperature sensed
0
is >25C ( first time
plugged, long time
disconnected and
Plugged again)
R Temperature
Sensed is lower
0
than 25Cand
unplugged the
Refrigerator and
plug again for
Test Defrost on
line Production,
or service .
7-1-7 SEQUENTIAL OPERATION :
Remarks

7-1-8 TEST MODE
- 20 -
• The Test Mode is useful for checking functionality also helps tofind out the defectivepart in case of fault.
• The Test Key is on Main PCB, The Test Mode will be clear in 2 Hrs. After Test Mode, System Reset is must .
• During Test Mode if any error is detected, the error code is displayed and Test Mode is cleared.
• If an error code is displayed, Test Mode can not be active even if T est Button is pushed.
Mode Operation Contents Remarks
TEST 1 Push the Test
Key Once. •Continuous comp . And Freezer
fan Operation.
•Defrost Heater OFF.
•All Display LED ON.
Reset if the temp. of
The defrost sensor
0
is 10 C or above.
Reset to the Previous Setting. Comp. Will start in 7
Min delay.
TEST 2
Reset
Push the Test
Key Once in
Test Mode 1.
•Comp .And Freezer fan OFF.
•Defrost Heater ON.
•All Display LED Except
Refrigerator temp status LEDs off.
Push the Test
Key Once in
Test Mode 2.
Display Status : Test Mode 1 Display Status : Test Mode 2
All Display LED ON. : OFF
TEMP
COLD COLD
COLDEST COLDEST
SUPER
COOL
TEMP
SUPER
COOL