SERVICE MANUAL

REFRIGERATOR

ATTENTION

Before start servicing, carefully read the safety instructions in this manual

MODEL(S): GR-382R

LRTP1231W

Contents

Safety Precautions ----------------------------------------------- -------------------------------------- 1

Service Precautions ----------------------------------------------------------------------------------- 2-3

Specifications ------------------------------------------------------------------------------------------- 4

Feature Chart ------------------------------------------------------------------------------------------- 5

Circuit Diagram ------------------------------------------------------------------------------------------ 6-7

Cooling Systems ---------------------------------------------------------------------------------------- 8

Product Disassembly ---------------------------------------------------------------------------------- 9-11

Doors ------------------------------------------------------------- ----------------------------------------- 9

Door Switch ---------------------------------------------------------------------------------------------- 9

Electronic Control Display PCB ----------------------------------------------------------------- --- 9

Freezer Fan ---------------------------------------------------------------------------------------------- 10

Defrost Control ------------------------------------------------------------------------------------------ 10

Lamp ------------------------------------------------------------------------------------------------------- 10

Refrigerator Control Box ------------------------------------------------------------------------------ 11

Reversible Door --------------------------------------- --------------------------------------------------- 12-13

Adjustments ----------------------------------------------------------------------------------------------- 14-15

Compressor ---------------------------------------------------------------------- ------------------------ 14

PTC Starter----------------------------------------------------------------------------------------------- 14

Overload Protector (OLP) ---------------------------------------------------------------------------- 15

Troubleshooting ----------------------------------------------------------------------------------------- 16-21

Compressor & Electrical Components ------------------------------------------------------------ 16

PTC & OLP ------------------------------------ ---------------------------------------------------------- 17

Other Electrical Components ----------------------------------------------------------------------- 18

Service Diagnosis Chart ------------------------------------------------------------- ----------------- 19

Refrigerant Cycle --------------------------------------------------------------------------------------- 20-21

MICOM circuit & operation --------------------------------------------------------------------------- 22-39

Refrigerator Exploded View-------------------------------------------------------------------------- 40-41

Service Parts list----------------------------------------------------------------------------------------- 42-43

Safety Precautions.

Read the following inst ructions before servicing your refrigerator.

6. If you check the bottom part of the refrigerator while the freezer door is open, be careful standing up. You could bump your head.

1. Unplug the refrigerator before servicing.

2. Visually inspect for gas leakage or short circuit.

3. If testing with the refrigerator plugged in, wear rubber gloves to avoid electric shock.

4. Do not touch frozen metal parts; your hands could freeze to the surface. This may cause frostbite.

5. Be sure that no water is dripping towards electrical or metal parts.

7. When you tilt your refrigerator be sure to take out all metal, glass, or other loose parts.

8. When servicing the evaporator, wear cotton gloves to prevent cutting by any of the evaporator fins.

1

Service Precautions

Refrigerant Recharging

Test the compressor's operation before

recharging the refrigerant; this is very

important to detect failures and to ensure the proper motor running, and to identify failures immediately. If failure has been detected, clean the system from any other possible

R-134a residues by breaking the final part of the compressor's service pipe at it's thinnest part as shown in Fig. #1.

Replace the filter and any other part that could be deteriorated. Unweld and pull out the service pipe,

then place a new pipe extension with a

Hansen male connector and solder the new pipe. See Fig. #2

0(absolute or -1 atm, -760 mm Hg.) It is not recommend to run the vacuum pump for more than 30 minutes. See

Figure 3.

In case there is a large leak and the vacuum operation must stop, you must add a small amount of refrigerant to the system and check with an electronic leak detector. If a soldering failure is detected, open the valve before soldering to equalize the pressure and keep solder from being blown out of the joint or sucked into the piping.

As soon as the repair is completed, charge the correct amount of refrigerant into the system.

Remember that each system requires a specific amount of refrigerant with a tolerance of ±5 grams. See Figure 4.

It is necessary to open the valve when soldering to allow the gases to escape without forcing the molten solder out of the joint. The extension with the male Hansen connector should be connected to a female type connector to the vacuum pump's pipe.

See Fig. #3

System air evacuation starts as soon as the pump begins to run. The system must be kept under vacuum until the low pressure gauge shows

Before performing this operation (if the vacuum pump and charging cylinder are still attached to the system) be sure the valve between the pump and the cylinder is closed to

2

Service Precautions

keep refrigerant out of the system.

See Figure 5.

For gas charging, check the graduated scale on the cylinder to see the amount of refrigerant that it contains and the amount that will be pumped into the system. For example, if you have 750 grams of refrigerant in the cylinder and we have to pump 165 grams to the system, this amount will be reached when the indicator reaches 585 grams; remember that the indicator shows a lower level of meniscus.

Do this after choosing the scale corresponding to the gas pressure indicated on the pressure indicator located on the upper part of the column. To let R-134a flow into the

system, open the valve at the recharging cylinder's base. The total amount of refrigerant should not be installed in one session, as it could block the compressor. Install 20~30 grams at a time and close the valve.

The compressor will run and the pressure will drop. Then open the

valve and install other 20~30 grams of refrigerant. Repeat this procedure until the entire amount has been added to the system. Under operating conditions, the system pressure should stabilize between 0.3 and 0.6 atm.

3

Feature Chart

FREEZER

Temperature

Control

Shelf

Ice Trays

Twist´n Serve

REFRIGERATOR

Temperature

Control

Fresh Meat

Tray

Lamp

Shelves

(Plastic or Glass)

Deodorizer

(Absorbs

Odors)*

Multi Air Flow

Air flow distributor

Vegetable Tray

(Keeps fruits and vegetables fresh)

MODEL(S): GR-382R

LRTP1231W

* This part is only included in model LRTP1231W

Magic Crisper

(Vegetable Tray cover that control humidity)

Freezer

Door Baskets

Refrigerator

Door Baskets

Leveling

Screws

5

Switch

Graphic Circuit Diagram

Fan

Thermal Fuse

Defrost Resistance

(Heater Cord)

Sensor

Evaporator

White

White

Brown

Red

Red

Blue

C

C c

Orange

Orange

Brown

Red

Violet

Defrost Resistance

Orange

Orange

Brown

Yellow

Control

Sensor

Lamp

Red

Pink

Yellow

Blue

Violeta

Whitte

White

Yellow

Blue

Blue

Black

Brown

Red

CON2

Sensor

Blue

Blue

Fan

Motor

Defrost and Temperature Electronic Control

CON1

Black

AC Current

Blue

Brown

Black

M

Pink

OLP

Pink

Blue

Running Capacitor

COMPRESSOR

7

Cooling Systems

Direct System Indirect System

Important: Check that the air ducts are not

obstructed for a better cooling

performance.

Temperature variation during defrosting time, depending upon the cooling system .

Temp.( ? )

4

3

Indirect System

Refrigerator

Freezer

-16

-18

Temp.( ? )

18

Direct System

Tim e

3

-3

-18

Tim e

8

3. Product Disassemble.

Doors

Freezer Door

1. Remove hinge cover by pulling it

upwards.

2. Loosen the hexagonal bolts that

hold the upper hinge in place. See

Figure 1.

3. Remove door. See Figure 2.

2. Disconnect all switche's cables.

See Figure 8

Figure 1

Figure 2

4. Pull gasket to remove it. See

Figures 3 and 4.

Figure 7

Figure 8

Control Circuit ( Display PWB)

1. Remove the lamp cover by inserting a screwdriver in the lower

side's holes. See Figure 9.

2. Loosen and remove the 2 screws.

See Figure 10.

Figure 3

Figure 4

Refrigerator Door.

1. Loosen the hexagonal bolts that

hold the central hinge in place.

See Figure 5.

2. Remove refrigerator door. See

Figure 6.

3. Pull out the gasket to remove it

from the door. See Figure 4 from

Freezer door.

Figure 9 Figure 10

3. Pull out the Control Box. See

Figure 11.

4. Disconnect the connector from the

cable terminal. See Figure 12.

5. Remove the EPS Multi air duct

(insulation) from the control box.

6. Detach the electronic control

(Display, PWB). See Figure 13.

Figure 5

Figure 6

Door Switch

1. Pull out the door switch out using

a flat head screwdriver. See

Figure 7

9

Figure 11

Figure 12

Figure 13

Fan and Fan Motor.

1. Remove freezer shelf.

3. Remove the ice bin assembly by

pulling it to the right side, until it

snaps out.

4. Remove Grill Fan screw cover.

See Figure 14.

5. Loosen the screw. See Figure 15.

6. Pull out the fan cover. Figure 16.

Defrost Control Assembly

1. The defrost control assembly

consists of one thermistor and a

fuse that melts with heat.

2. The termistor's function is to

sense the compartment's

temperature and automatically

stop the defrost. The termistor is

located beside of the evaporator

bracket.

3. The melting fuse is a safety device

to prevent an overheating of the

defrosting resistance when it

operates.

4. The fuse melts at 162° F and the

resistance heater stops.

5. To replace this components,

please follow the steps mentioned

at Figure 18.

Figure 14

Figure 15

6. Unplug the connector.

7. Remove the fan holder shroud.

Figure 17.

8. Remove fan and loosen both

screws that hold the bracket.

9. Remove the motor bracket and the

rubber parts. Pull out the fan

motor. See Figure 17.

Figure 16

Figure 17

1. Figure 18. Unplug the connector plugged to

Lamp.

Refrigerator Compartment Lamp

1. Remove the lamp cover with

a screwdriver or a similar tool.

See Figure 19.

2. Remove the lamp by unscrewing it

counterclockwise and replace it

with the same specifications

(125V,20W). Part Number

6912JB2002J.

10

Figure 13

Figure 19

Refrigerator Control Box.

Remove the lamp cover as mentioned before.

1. Loosen the screws.

2. Remove the entire control box.

See Figure 20.

3. Disconnect the control box

connector. See Figure 21.

Figure 20

11

Figure 21

4. Reversible Door

PRECAUTION

1.

Before reversing the doors, remove all foods and accesories,

like shelves or trays, which are not attached to the doors.

2. Use a Philips screwdriver, bolt driver, torque wrench, or spanner to

tighten and loosen the bolt.

3. Be careful not to drop the refrigerator or door when assembling or

disassembling lower hinge or the Adjustable Screw Assembly.

4. Don´t lay the refrigerator down to work on it. It will cause

malfunction.

5. The doors may be reversed to provide left or right opening, depending upon the customer´s

preference.

HOW TO REPLACE THE DOOR OPENING LEFT TO RIGHT

(when converting from left-opening to right opening)

12

13

5. Adjustments

1- COMPRESSOR

1-1 Function

The compressor sucks low pressure evaporated gas from the evaporator and compresses it into high temperature/high pressure gas and sends it to the condensor.

1-2 Composition

The compressor includes the compressing system, a motor, and an enclosure. The PTC (thermistor) and

OLP (Overload Protection Device) are attached to its exterior. Handle and repair the compressor with care. It includes parts manufactured to 1 micron tolerance, and is hermetically sealed to exclude dust or humidity after fabrication. Dust, humidity, or flux getting into the refrigeration cycle could clog it or otherwise affect the cooling.

1-3 Use notes.

(1) Protect your refrigerator from over

currents or overloads.

(2) Do not bump or jar the

compressor. If it is bumped or

forced (dropping or careless

handling,) it could damage the

compressor or cause noise or

undesirable operation.

(3) Use only exact replacement parts

when repairing the compressor. If

the terminals become corroded, it

could affect operation. If the

replacement parts are of incorrect

values, operation and safety will

be compromised.

2- PTC

2-1 PTC Composition

(1) The PTC (Thermistor) is a

semiconductive starting

component that is made with

(2) The higher the temperature, the

higher the resistance value will be.

This characteristic is used for

starting the motor.

2-2 PTC Function

(1) The PTC is attached to the

hermetic compressor and its used

for its starting.

This household refrigerator uses a

single induction motor. During

normal operation, the motor starts

with current flowing through both

the main and the auxiliary

windings. After the motor starts,

current to the auxiliary winding is

cut off.

2-3 PTC- Electric Diagram

According to motor starting method.

14

(1) To restart normal operation after a

power interruption, wait 5 minutes

to let the pressure equalize and

the PTC to cool.

(2) During normal operation, the PTC

generates heat. If it has not had

time to cool after a power

interruption, the motor will not

restart until the PTC cools.

2-5 PTC OLP Relation

(3) If power is cut off during

compressor operation and then

restored before the PTC has

cooled down, it's resistance value

increases. As a result, the current

cannot flow to the auxiliary

winding and the motor cannot start

and the OLP operates due to the

current overflow through the main

winding.

(3) While the OLP repeats the

ON/OFF operation 3~5 times, the

PTC cools and the compressor

operates normally. If the OLP

does not operate when the PTC is

hot, the compressor motor will

overheat, causing a short circuit or

possibly a fire. Therefore, use a

fail-safe OLP.

(1) Be careful not to cause an

overvoltage or short circuit.

(2) Do not force or bump it.

(3) Keep the OLP dry. If water or oil

gets into the OLP, the electrical

insulation can degrade and fail.

(4) Do not replace the PTC at your

own convenience. Do not

disassemble the PTC. If the PTC's

exterior is damaged, the

resistance value changes and

may cause failure during the

stating of the compressor's motor.

Use a PTC in good condition.

3- OLP

3-1 OLP Definition

(5) The OLP is a bimetallic, heat-

sensitive switch attached to the

compressor. Its function is to

protect the motor in the event of

overheating.

(6) When an overvoltage flows to the

motor, the bimetal reacts by

heating and activating (opening)

the OLP.

3-2 OLP Function

(7) Prevents the starting to the motor

winding.

(8) Do not turn the adjustment screw

during normal OLP operation.

(OLP connection diagram)

15

6. Troubleshooting

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

1

Power Source .

2

3

Check the resistance of

Motor

Compressor.

Check the resistance of

PTC-Starter.

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%)

OLP disconnected?.

Replace OLP.

Check connection condition.

Go to Step 2

Go to Step 5

Reconnect. the range of Rating

Voltage 10%.

Consult a qualified electrician.

YES

Check the resistance among M-C, S-C and M-S in Motor Compressor.

NO

Replace

Compressor.

Go to Step 3

Go to Step 5

Go to Step 3

Go to Step 4

Go to Step 5

Check the resistance of two terminals in PTC-

Starter.

Replacce

PTC-Starter.

Go to Step 4

Go to Step 5

4

5

Check OLP.

Check starting state.

Check if applying a regular OLP.

Measure minimum starting voltage after 5 min. for balancing cycle pressure and cooling the PTC.

OLP works within 30 seconds In forcible

OLP operation by turning against power on and off.

YES

NO

Replace OLP.

NO

Components start in the voltage of Rating

Voltage 10% below.

YES

O.K.

NO

Go to Step 5

Go to Step 1

16

6-2 PTC AND OLP

Normal operation of

Compressor is impossible or poor.

Separates the PT from Compressor and measure the resistance between

No. 5 and 6 (only

RSIR Type) or No. 4 and 5 of PTC with a

Tes ter or Wheatstone

Bridge (Figure 22).

Observation value is

220V/50Hz: 22 W ±30%

115V/60Hz: 6.8 W ±30%

240V/50Hz: 33 W ±30%

127,220V/60Hz:22 W ±30%

The Resistance value is 0 or several hundreds W

The value is ?

Check the other electric components.

Replace PTC.

Separate the OLP from Compressor and check resistance value between two terminals of OLP with a Tester.

(Figure 23).

YES

NO

Check other electric components.

Replace OLP

17

6-3 OTHER ELECTRIC COMPONENTS

No Cooling

Compressor doesn´t run.

Check if current flows to the following components.

Cause

Running state of

Compressor is poor. a. Starting Devices b. OLP c. Compressor coil d. Circuit Parts

Check starting voltage.

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.

Shorted or Broken

Poor contact or shorted.

Coil Shorted.

Poor contact or shorted.

Low Voltage

Poor contacting and broken.

Shorted

Lack of Capacity

Compressor

Motor Coil.

Poor contact

Fan Motor doesn´t run.

Much frost is on the evaporator.

Checker current flow of the door switch.

Check current flowing in the fan motor.

Check current flow of the following components:

· Defrost Control

Check current flow of the following components:

· L-CORD, TE-PLATE

Coil is shorted

Shorted

Replace each component.

Raise the voltage.

Replace the defective component.

Replace the

Compressor.

Replace the defective component.

Replace PTC.

Replace PTC.

18

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

No Cooling

Poor Cooling

1. Is the power cord unplugged?

2. Check if the power switch is set to OFF.

3. Check if the fuse of power switch is shorted.

4. Measure the voltage of power outlet.

1. Check if the refrigerator is placed close to a wall.

2. Check if the refrigerator is placed close to a stove, oven or in indirect sunlight.

3. Is the ambient temperature high or the room door closed?

4. Check if putting in hot food.

5. Did you open the refrigerator door too often?

1. Is the ambient temperature too low?

10°C (40°F).

· Plug it to the outlet.

·

Set the switch to ON.

· Replace a regular fuse.

·

If the voltage is low, check the wiring or call an electrician.

·

Place the set with the space of about 10 cm.

· Place the set apart from these heat sources.

·

Is the ambient temeperature within spec?

(above 10°C or 40°F )

· Put food in after it cools.

·

Don´t open the door too often and close it firmly.

Poor Freezing

Food in the refrigerator is frozen

Moisture or ice forms in the chamber of the set.

Moisture forms on the outside

3. Is food buckling the cooling air outlet?

4. Check if the PWB is set to MAX.

7. Is watery food kept?

8. Check if putting in hot food.

9. Did you open the refrigerator door too often?

13. Check if ambient temperature and humidity are high.

14. Is there a gap in the door gasket?

2. To make the freezer colder, set the COLD

AIR CONTROL to 7 and set the R control button (PWB) to MAX.

5. Place food in high temperature section

(Front Part).

6. Set the button to MID.

10. Seal watery food with vinyl wrap.

11. Put food after it cools.

12. Don´t open the door too often and close it firmly.

15. Wipe moisture with a dry cloth.

16. This does not occur if the temperature and humidity are in the normal range.

17. Fix the gap.

22. Adjust the leveling screws. Position the refrigerator properly.

23. Remove the objects.

24. Replace the tray.

25. Replace the cover.

Abnormal Noise

Door doesn´t close well.

Ice and food smell unpleasent.

18. Is the refrigerator positioned in a firm and even place?

19. Is something in the way behind the refrigerator?

20. Check if the evaporating tray cover is left off.

21. Check if the cover of mechanical room in below and front sides is taken out.

26. Check if the door gasket area has become dirty or contaminated.

27. Is the refrigerator placed in a firm and even place?

28. Is too much food put in the refrigerator?

32. Check if the inside of the refrigerator becomes dirty.

33. Did you keep fragrant foods without wrapping?

34. It smells plastic.

29. Clean the door gasket.

30. Position the refrigerator in a firm place and adjust the leveling screws.

31. Keep food from reaching to the door.

35. Clean the inside of the refrigerator.

36. Wrap fragrant food.

37. The new refrigerator smells of plastic, but the odor will dissipate after a couple of weeks.

In addition to the items described above, refer to the following to solve the complaint.

Check if frost forms in the Freezer.

Defrosting is poor.

Replace the componets of the defrosting circuit.

Check Refrigerating

Cycle.

The cycle is faulty.

Repair the cycle.

19

6-5 REFRIGERATING CYCLE

Troubleshooting Chart

CAUSE

PARTIAL

LEAKAGE

PARTIAL

CLOG

WHOLE

CLOG

REFRIGERAT

CONDITION

Freezer and

Refrigerator don´t get cold normally.

WHOLE

LEAKAGE

Freezer and

Refrigerator don´t get cold at all.

Freezer and

Refrigerator don´t get cold normally.

Freezer and

Refrigerator don´t get cold at all.

EVAPORATOR

CONDITION

Low flowing sound of refrigerator is heard and frost forms in inlet only.

Flowing sound of refrigerant is not heard and frost isn´t formed.

TEMPERATURE

OF THE

COMPRESSOR

A little higher than ambient temperature.

Equal to ambient temperature.

REMARKS

1. A little refrigerator has leaked.

2. Refrigerator runs normally if you recharge it.

3. No discharging of refrigerant.

4. Refrigerator runs normally if yoy recharge it.

Flowing sound of refrigerant is heard and frost forms in inlet only.

A little higher than ambient temperature

5. Normal discharginf of refrigerant.

6. The capillary tube is faulty.

Flowing sound of refrigerant is not heard and frost isn´t formed.

Equal to ambient temperature.

7. Normal discharging of refrigerant.

MOISTURE

CLOG

Cooling operation stops periodically.

Flowing sound of refrigerant is not heard and frost melts.

Lower than ambient temperature.

8. Cooling operation restarts when heating the inlet of capillary tube.

COMPRESSION

Freezer and refrigerator don´t get cold.

No compressing operation.

Low flowing sound of refrigerant is heard and frost forms in inlet only.

Flowing sound of refrigerant is not heard and no frost.

A little higher than ambient temperature.

Equal to ambient temperature.

CO

COMPRESSION

9. Low pressure on high side.

· No pressure of high pressure side in compressor.

Leakage Detection

Check for a leak which may be in the oil discharge in the compressor or in the evaporator.

Check if

Compressor runs.

YES

Check if frost forms on the evaporator.

No frost or forms in inlet only.

Check for oil leaks.

Normal formed frost.

Moisture clog

Normal amount.

Faulty Compressor

Observe the discharging amount of refrigerant.

Large or small amount.

Recharge refrigerant to compressor and check cooling operation.

YES

Check Compressor

Clogged by dust.

Refrigerant leakage.

Slight frost forms on

Evaporator.

(Locate and repair the leak.)

20

General Control of Refrigerating Cycle.

NO. ITEMS

1 WELDING ROD

CONTENTS AND

SPECIFICATIONS

1. H

3

O

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 %

Rest: within 0.2%

Brazing Temperature: 735~840°C

2 FLUX

Ingredients and Preparation:

Borax 60%

Fluoridation Kalium: 35%

Water: 5%

REMARKS

1. Recommended H34 containing 34% Ag in the

Service Center.

3 DRIER ASSEMBLY

·

·

Assemble the drier within 30 minutes after unpacking.

Keep the unpacked drier at the temperature of

80~100°C

2. Don´t store the drier outdoors, because humidity damages it.

4 VACUUM

1.

2.

3.

4.

When measuring with pirant Vacuum gauge of charging

M/C, vacuum degree is within 1 Torr.

If the vacuum degree of the cycle inside is 10 Torr.

Below for low pressure and 20 Torr. For high pressure, indicates no vacuum leakage state.

Vacuum degree of vacuum pump must be 0.05 Torr. below after 5 minutes.

Vacuum degree must be the same of the value described on item (2) above for more than 20 min.

3.

4.

5.

Apply M/C Vacuum Gauge withou fail.

Perform vacuum operation until a proper vacuum degree is built up.

If a proper vacuum degree is not built up, check the leakage from the Cycle Pipe line parts and Quick

Coupler Connecting part.

5

DRY AIR AND NITROGEN

GAS

·

·

·

The pressure of dry air must be more than 12~6Kg/cm

2

.

Temperature must be more than –20 ~ -70°C.

Keep the pressure to 12~6Kg/cm

2

also when substituting dry air for Nitrogen gas.

6 NIPPLE AND COUPLER

1.

2.

Check if gas leaks with soapy water.

Replace Quick Coupler in case of leakage.

6. Check if gas leaks from connecting part of coupler.

1. Put all joint pipe in a clean box and cover tightly with the lid so dust or humidity do not contaminate.

7 PIPE

21

7. MICOM Function & Circuit

7-1 FUNCTION

7-1-1 FUNCTION

1. When the appliance is plugged in, it is set to Medium. Each time the button is pushed, it cycles through Medium Medium/High High Low Medium/Low Medium.

2. When the power is initially applied or restored after a power failure, it is automatically set to

Medium.

Temperature

Control

Low

Medium

Low

Medium

Medium

High

High

TEMP °F (°C) 46.4 (8)

39.2 (4) 37.4 (3) 34.7 (1.5) 30.2 (-1)

ROOM REFRIGERATOR

22

7-1-2 DEFROSTING

1. The defrosting is performed each time when the total running time of the compressor reaches 10 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, the defrosting error code is displayed. (Refer to 7 -1-4 Error

Diagnostic Mode).

4. With the defective defrosting sensor (cut or short-circuited wire), the defrosting will not be performed.

7-1-3 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS

The electric components, such as the compressor, defrosting heater, and cooling fan, starts sequentially to avoid 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.

23

7-1-4 ERROR DIAGNOSTIC MODE

1. The error diagnostic mode indicates when a fault may affect the performance of the product occurs while operating the product.

2. Even if a function control button is pushed when an error occurs, the function will not be performed.

3. When the error is cleared while the error code is displayed due to a fault, the refrigerator returns to the normal condition (Reset).

4. The error code is displayed by the refrigerator temperature indication LED on the display of the refrigerator while the remaining LEDs are off.

24

7-2 PCB FUNCTION

7-2-1 POWER CIRCUIT

The second part of the Transformer is composed of the power supply for the display and relay drive (12 Vdc) and for the MICOM and IC (5 Vdc).

The voltage for each part is as follows:

VA1 prevents overvoltage and noise. When 175 V or higher power is a pplied, the inside elements are short-circuited and broken, resulting in the blowout of the fuse in order to protect the elements of the secondary part of the Transformer.

25

7-2-2 OSCILLATION CIRCUIT

This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data to and from the inside logic elements of the IC1 (MICOM). Be sure to use the exact replacement parts since the calculating time by the IC1 may be changed or it will not work if he OSC1 SPEC is changed.

7-2-3 RESET CIRCUIT

The reset circuit is for allowing all the functions to start at the initial conditions by initializing various parts including the RAM inside the MICOM (IC1) when the power is initially supplied or the power supply to the MICOM is restored after a momentary power failure. For the initial 10 ms of power supply, LOW voltage is applied to the MICOM RESET terminal. During a normal operation, 5 V is applied to the RESET terminal. (If trouble occurs in the RESET IC, the MICOM will not work).

26

7-2-4 LOAD DRIVE CIRCUIT

1. Load Drive Condition Check

FEEZER

FAN

COOLING

FAN

MELTING DEFROST

FUSE HEATER

Load Type

Measurement Location

Condition

ON

OFF

Compressor, Freeze Fan

Motor

A

Defrosting Heater

1 V or below

12 V

B

27

7-2-5 TEMPERATURE SENSOR CIRCUIT

REFRIGERATOR-SENSOR

DEFROST-SENSOR

The upper CIRCUIT reads REFRIGERATOR temperature and DEFROST -

SENSOR temperature for defrosting into MICOM. OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:

SENSOR

Refrigerator Sensor

Defrosting Sensor

CHECK POINT

POINT A Voltage

POINT B Voltage

NORMAL (-30 -50)

0.5 V 4.5 V

SHORT-

CIRCUITED

0 V

OPEN

5 V

28

7-2-6 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING

COMPENSATION CIRCUIT

1. Refrigerator Temperature Compensation

Refrigerator

Resistance

(RCR1)

180 KW

Temperature

Compensation

°F (°C)

41 (+5.0)

39.2 (+4.0)

37.4 (+3.0)

Remark

Compensation by raising the temperature

56 KW

33 KW

18 KW

12 KW

10 KW

8.2 KW

5.6 KW

35.6 (+2.0)

35.24 (+1.8)

32 ( 0 )

30.2 ( -1.0 )

28.4 ( -2.0 )

Standard Temperature

Compensation by lowering the temperature

3.3 KW

26.6 ( -3.0 )

2 KW

24.8 ( -4.0 )

470 KW

23 ( -5.0 )

Table of Temperature Compensation by adjusting the resistance (Difference with the current temperature).

Example. If the refrigerator compensation resistance (RCR1) is changed from 10 K (the current resistance) to 18 K (the adjustment resistance) of the refrigerator rises 33.8°F (+1°C).

29

7.2.7 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT

The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on the corresponding function indication LED. The drive type is the scan type.

30

7-3. RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE SENSOR

°F (°C)

RESISTANCE OF REFRIGERATOR

(DEFROST) SENSOR

-4 -20

5 -15

14 -10

23 -5

32 0

41 +5

77

KW

66

KW

47.3

KW

38.4

KW

30

KW

24.1

KW

50 +10

59 +15

68 +20

77 +25

19.5

KW

15.9

KW

13

KW

11

KW

86 +30

104 +40

8.9

6.2

KW

KW

122 +50 4.3

KW

1. The resistance of SENSOR HAS 5% common difference.

2. Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature. This postponing is necessary because of perceiving speed.

31

7-4. TROUBLE SHOOTING

* Replace the PWB when there´s no trouble after checking the contents of trouble.

32

33

7-4 MAIN PWB ASSEMBLY AND PARTS LIST.

7-4-1 MAIN PWB ASSEMBLY.

34

7.5 PWB DIAGRAM

REFRIGERATOR-LAMP

FREEZER FAN/MOTOR

COOLING FAN/MOTOR

MELTING

FUSE

DEFROST-

HEATER

38

39

REFRIGERATOR-SENSOR

DEFROST-SENSOR

8. Exploded View

The parts of refrigerator and the shape of each part may vary by market area.

Capacitors and fuse are optional parts.

Optional parts:

40

D

A

41

9. Service parts list

Loc. Descripción

103A HANDLE,BACK

103B HANDLE,BACK

104C LEG ASSEMBLY

105A DRAIN,PIPE-Z

106A ADJUSTABLE LEG

106B ADJUSTABLE LEG

110A PWB(PCB) ASSY,DISPLAY

110B ICE TRAY GUIDE

REFRIGERATOR CONTROL BOX

120A ASSEMBLY

120B REFRIGERATOR CONTROL BOX COVER

120E DUCT,INSULATION

120G DUCT,INSULATION

125A ICE TRAY

125H ICE TRAY SUPPORTER

125L ICE TRAY HOLDER

129A DUCT GUIDE

131A ICE BIN

149A FREEZER SHELF

149B MEAT TRAY

149C REFRIGERATOR SHELF ASSEMBLY

149E REFRIGERATOR SHELF ASSEMBLY

151A VEGETABLE TRAY

154A VEGETABLE TRAY COVER

158C LAMP COVER

200A FREEZER DOOR ASSEMBLY

201A FREEZER DOOR FOAM ASSEMBLY

203A FREEZER DOOR GASKET ASSEMBLY

205A DOOR BASKET

210A DOOR STOPPER

210B STOPPER GUIDE

212G NAME PLATE,P(H)

230A REFRIGERATOR DOOR ASSEMBLY

231A REFRIGERATOR DOOR FOAM ASSEMBLY

233A

REFRIGERATOR DOOR GASKET

ASSEMBLY

241A DOOR BASKET

241B DOOR BASKET

241C DOOR BASKET

241D DOOR BASKET

281A HINGE COVER

GR-382R

Part Number

3650JJ2003A

3650JJ2003E

4981JA3006A

5250JA2009A

3J04686A

3J04686A

6871JB2036A

4974JJ1003A

4995JJ1001E

11Ft

3

LRTP1231W

Part Number

3650JJ2003B

3650JJ2003F

4981JA3006A

5250JA2009A

3J04686A

3J04686A

6871JB2036A

4974JJ1003A

4995JJ1001F

4994JJ1001A

5208JJ1006A

5208JJ1005A

3390JJ1003A

4980JJ1001A

4930JJ3001A

4974JJ1001A

5074JJ1001A

5026JJ1001B

3390JJ1002A

5027JJ2001A

5027JJ2002A

3390JJ1001A

3550JJ1003B

3550JJ1004B

3581JJ8009B

5433JJ0011A

4987JJ1001A

5004JJ1001B

4620JJ2004A

4974JA3031A

4140JD1020P

3581JJ8010A

5433JJ0012B

4987JJ1001C

5004JJ1004B

5004JJ1002B

5004JJ1003B

5004JJ1005B

3550JJ2011A

4994JL1001A

5208JJ1006A

5208JJ1005A

3390JJ1003A

4980JJ1001A

4930JJ3001A

4974JJ1001A

5074JJ1001A

5026JJ1001B

3390JJ1002A

5027JJ2003A

5026JJ1002A

3390JJ1001A

3550JJ1003B

3550JJ1004A

3581JJ8001D

5433JJ0003D

4987JJ1001A

5004JJ1001B

4620JJ2001A

J325-00033A

4140JD1020B

3581JJ8002D

5433JJ0005B

4987JJ1001B

5004JJ1004B

5004JJ1002B

5004JJ1003B

5004JJ1005B

3550JJ2004B

42

Loc. Descripción

281B UPPER HINGE ASSEMBLY

282B CENTER HINGE ASSEMBLY

283B LOWER HINGE ASSEMBLY

301A EVAPORATOR ASSY

303A SPACER,INSULATION

303B SPACER ASSY

304A MECHANICAL AREA COVER

307A COMPRESSOR ASSEMBLY

308A PTC ASSEMBLY

309A OLP

310A PTC COVER

312A BUSHING

314A COMPRESSOR BUSHING

315A COMP BASE ASSY,STD

315B ROLLER

315C PIN

317A DRIER ASSY

318A DRIER HOLDER

319A DRIP TRAY

319C FAN GUIDE

323B CONDENSER ASSY,WIRE

327A BUSHING

328A BUSHING

329A FAN ASSEMBLY

329C FAN ASSEMBLY

330B FREEZER SHROUD ASSEMBLY

332A FAN GRILLE ASSEMBLY

401A DEFROST CONTROL ASSEMBLY

404A FAN MOTOR (MECHANICAL AREA)

405A MOTOR BRACKET

405C FAN MOTOR BUSHING

406B DOOR SWITCH

407A HEATER,PLATE

410H CAPACITOR[M/R]

411A CONNECTOR ASSEMBLY

418A HEATER,CORD

420A MOTOR(MECH),COOLING

501A MAIN PWB ASSEMBLY

501F PWB ASSEMBLY

604F DEODORIZER COVER

155J NAME PLATE,P(H)

409B LIGHT BULB

604G DEODORIZER

GR-382R

4775JA3015C

4775JA3009B

11Ft

3

LRTP1231W

4775JA2001D

4775JA3009A

4775JA2020A

5421JA2359B

4826JJ2001A

4827JJ3001A

3551JJ2002A

2521JA1006A

6748JA3001A

6750JA3001A

3550JA2158A

5040JA3044A

4J03277A

3103JJ2001C

3J02312A

4J04238A

5851JJ2002A

4930JJ3002A

3390JJ0001A

4974JJ1002A

5403JA1039A

5040JJ3003A

5040JJ3002A

5901JJ1001A

5901JJ1001B

4999JJ1001A

3531JJ1001A

6615JB2005C

4680JB1033B

4810JA3007A

J756-00008B

6600JB1002K

5300JB1080F

0CZZJB2003G

6877JK3001A

5300JB1079F

4680JB1017Q

6871JB1115A

3550JJ2001B

3550JJ2002A

4140JJ2001A

6912JB2002J

4775JA2023B

5421JA2359A

4826JJ2001A

4827JJ3001A

3551JJ2002A

2521C-B5602

6748C-0004D

6750C-0005D

3550JA2087B

5040JA3021A

4J03277A

3103JJ2001A

3J02312A

4J04238A

5851JJ2002A

4930JJ3002A

3390JJ0001A

4974JJ1002A

5403JA1039A

5040JJ3003A

5040JJ3002A

5901JJ1001A

5901JJ1001B

4999JJ1001A

3531JJ1001A

6615JB2005A

4680JB1033D

4810JA3007A

J756-00008B

6600JB1002K

5300JB1080F

J513-00003C

6877JK1002A

5300JB1079C

4680JB1017C

6871JB1115B

3550JJ2001A

3550JJ2002A

4140JJ2001A

6912JB2002J

NO DEODORIZER 5986JA3007B

43

P/No. 3828J8331B

Electronics Inc.