LG LRTN19330xx Service Manual

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Page 1

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

REFRIGERATOR

SERVICE MANUAL

models

LRTN22330

LRTN22320

LRTN19330

LRTN19320

Page 2

CONTENTS

SAFETY PRECAUTIONS ....................................................................................................................................................... 2

SPECIFICATIONS................................................................................................................................................................... 3

PARTS IDENTIFICATION....................................................................................................................................................... 4

DISASSEMBLY.................................................................................................................................................................... 5-6

DOOR................................................................................................................................................................................... 5

DOOR SWITCH.................................................................................................................................................................... 5

FAN AND FAN MOTOR........................................................................................................................................................ 6

DEFROST CONTROL ASSEMBLY...................................................................................................................................... 6

LAMP.................................................................................................................................................................................... 6

CONTROL BOX-REFRIGERATOR...................................................................................................................................... 6

ADJUSTMENT..................................................................................................................................................................... 7-8

COMPRESSOR.................................................................................................................................................................... 7

PTC-STARTER..................................................................................................................................................................... 7

OLP (OVERLOAD PROTECTOR) ....................................................................................................................................... 8

TO REMOVE THE COVER PTC...........................................................................................................................................8

CIRCUIT DIAGRAM .......................................................................................................................................................... 9-10

TROUBLESHOOTING..................................................................................................................................................... 11-16

COMPRESSOR AND ELECTRICAL COMPONENTS ....................................................................................................... 11

PTC AND OLP.................................................................................................................................................................... 12

OTHER ELECTRICAL COMPONENTS ............................................................................................................................. 13

SERVICE DIAGNOSIS CHART.......................................................................................................................................... 14

REFRIGERATION CYCLE............................................................................................................................................ 15-16

OPERATION PRINCIPLE & REPAIR METHOD OF ICEMAKER .................................................................................. 17-20

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ............................................................................................... 21-33

EXPLODED VIEW & REPLACEMENT PARTS LIST ..................................................................................................... 34-39

SAFETY PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1. Check the refrigerator for electrical faults.

2. To prevent electric shock, unplug before servicing.

3. Always check line voltage and amperage.

4. Use standard electrical components or cause your skin to freeze and stick to the surfaces inside the freezer.

5. Don't touch metal products in the freezer with wet hands. This may cause frostbite.

6. Prevent water from spiling onto electric elements or the machine parts.

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7. Close the top door before opening the bottom door. Otherwise, you might hit your head when you stand up.

8. When tilting the refrigerator, remove any materials on the refrigerator, especially the glass shelves and stored food.

9. When servicing the evaporator, wear cotton gloves. This is to prevent injuries from the sharp evaporator fins.

10. Service on the refrigerator should be performed by a qualified technician. Sealed system repair must be performed by a CFC certified technician.

Page 3

1. SPECIFICATIONS

EVAPORATOR

COLD AIR

MIXED AIR

AIR RETURN TO EVAPORATOR

FRESH FOOD

CONTROL

FREEZER

EVAPORATOR/ EVAPORATEUR

1-1 DISCONNECT POWER CORD BEFORE

SERVICING IMPORTANT – RECONNECT ALL GROUNDING DEVICES

All parts of this appliance capable of conducting electrical current are grounded. If grounding wires, screws, straps, clips, nuts or washers used to complete a path to ground are removed for service, they must be returned to their original position and properly fastened.

1-2 IMPORTANT NOTICE

This information is intended for use by individuals possessing adequate backgrounds of electrical, electronic and mechanical experience. Any attempt to repair a major appliance may result in personal injury and property damage. The manufacturer or seller cannot be responsible for the interpretation of this information, nor can it assume any liability in connection with its use.

1-3 ELECTRICAL SPECIFICATIONS

Temperature Control (Position : MID) .................... 8-(-6)°F

Defrost Control .......................................................... 7 hrs.

Defrost Thermostat ..................................................... 50°F

Electrical Rating :115V. AC, 60 Hz. ...................... 1-5 Amp.

Maximum Current Leakage ..................................... 0.5 mA

Maximum Ground Path Resistance .................. 0.14 Ohms

Energy Consumption ............... 19 cu.ft : 443 kWh/yr(Energy star)

....................................... 22 cu.ft : 468 kWh/yr(Energy star)

1-7 REPLACEMENT PARTS

Relay............................................................. 6748C-0004D

Overload ....................................................... 6750C-0004S

Defrost Thermostat ...................................... 6615JB2005B

Defrost Heater .............................. 19cu. ft : 5300JK1003D

............................... 22cu. ft : 5300JK1003J

Evaporator Fan Motor .................................. 4681JB1016J

Capacitor ................................................... OCZZJB2003H

Compressor (Hi-Side) .................................. 2521C-A62A8

Evaporator (Lo-Side) ..................... 19cu. ft : 5421JJ0003A

..................... 22cu. ft : 5421JJ0002A

Condenser .................................................... 5403JJ1003A

Dryer ............................................................. 5851JJ2002K

Condenser Fan Motor .................................. 4681JK1001B

Temperature Control ................................. 6871JB2043A,B

Main Control.................................................. 6871JB1185A

1-8 AIR FLOW / CIRCULATION D’AIR

1-4 NO LOAD PERFORMANCE

CONTROL POSITION: MID/MID

And Ambient of : .........................70°F ..........................90°F

Fresh Food, °F ...........................33-41 ...................... 33-41

Frozen Food, °F .........................(-4)-4....................... (-4)-4

Percent Running Time ...............25-35...................... 45-60

1-5 REFRIGERATION SYSTEM

Minimum Compressor Capacity Vacuum ................... 21 in.

Minimum Equalized Pressure

@ 70°F ....................................................... 49 PSIG

@ 90°F ....................................................... 56 PSIG

Refrigerant - R - 134a ............................................ 5.47 oz.

Compressor ..................................................... 649 BTU/hr

1-6 INSTALLATION

Clearance must be provided at top, sides and rear of the refrigerator for air circulation.

AT TOP ......................................................................... 1 in

AT SIDES ................................................................... 1/8 in

AT REAR ...................................................................... 1 in

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2. PARTS IDENTIFICATION

Pizza Nook*

CustomCube Ice maker *

CustomFit

FlexiFloor *

Digital Sensor Control

Refrigerator Light *

Chef Fresh * / Snack Pan

Shelves

Can Dispenser*

OptiBin Crisper

Base Grille

Leveling Screw (inside)

Refrigerator Door Bin

Egg Box*

Design-A-Door

Icebeam Door Cooling *

Door Cooling Dairy Bin

Freezer Door Bin *

Freezer Light

* on some models

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Page 5

3. DISASSEMBLY

BOLT

HINGE

HINGE COVER

GASKET

LOWER HINGE

BOLT

DOOR SWITCH

LEAD WIRE

3-1 DOOR

● Freezer Door

1. Remove the hinge cover by pulling it upwards.

2. Loosen hexagonal bolts attaching the upper hinge to the

body and lift the freezer door.

Figure 1

3. Pull out the door gasket to remove from the door foam

assembly.

3-2 DOOR SWITCH

1. To remove the door switch, pry it out with a slotted-type driver, as shown in (Figure 4).

2. Disconnect the lead wire from the switch.

Figure 4

Figure 2

● Refrigerator Door

1. Loosen hexagonal bolts attaching the lower hinge to the body to remove the refrigerator door only.

Figure 3

2. Pull out the door gasket to remove from the door foam assembly.

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Page 6

3-3 FAN AND FAN MOTOR

FAN

BRACKET

SHROUD

GRILLE

FAN MOTOR

GRILLE ASSEMBLY

DEFROST-CONTROL ASSEMBLY

CONTROL BOX

COVER LAMP

1. Remove the freezer shelf. (If your refrigerator has an icemaker, remove the icemaker first)

2. Remove the grille by pulling it out and by loosening a screw.

3. Remove the Fan Motor assembly by loosening 4 screws and disassemble the shroud.

4. Pull out the fan and separate the Fan Motor and Bracket.

Figure 5

3-5 LAMP

Figure 8

3-5-1 Refrigerator Compartment Lamp

1. Unplug the power cord from the outlet.

2. Remove refrigerator shelves.

3. Release the hooks on both ends of the lamp shield and pull the shield downward to remove it.

4. Turn the lamp counterclockwise.

5. Assemble in reverse order of disassembly. Replacement bulb must be the same specification as the original (Max. 60 W-2EA).

3-4 DEFROST CONTROL ASSEMBLY

Defrost Control assembly consists of Defrost Sensor and FUSE–M.

Defrost sensor functions to defrost automatically. It is attached to metal side of the Evaporator and senses Temperature. At the temperature of 162°F(72°C), it stops the emission of heat from the Heater.

Fuse-M is a safety device for preventing over-heating of the Heater when defrosting.

1. Pull out the grille assembly. (Figure 6)

2. Separate the connector with the Defrost Control assembly and replace the Defrost Control assembly after cutting the Tie Wrap. (Figure 7)

Figure 6

Figure 9

3-5-2 Freezer Compartment Lamp

1. Unplug refrigerator or disconnect power.

2. Reach behind light shield to remove bulb.

3. Replace bulb with a 40-watt appliance bulb.

4. Plug in refrigerator or reconnect power.

3-6 CONTROL BOX-REFRIGERATOR

1. First, remove all shelves in the refrigerator, than remove the Refrigerator Control Box by loosening 2 screws.

Figure 7

Figure 10

2. Remove the Refrigerator Control Box by pulling it downward.

3. Disconnect the lead wire on the right position and separate the lamp sockets.

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Page 7

4. ADJUSTMENT

PTC STARTER

SEALED TERMINAL

COMPRESSOR MOTOR

PTC

OVERLOAD PROTECTOR

RSCR

4-1 COMPRESSOR

4-1-1 Role

The compressor intakes low temperature and low pressure gas from the evaporator of the refrigerator and compresses this gas to high-temperature and high-pressure gas. It then delivers the gas to the condenser.

4-1-2 Composition

The compressor includes overload protection. The PTC starter and OLP (overload protector) are attached to the outside of the compressor. Since the compressor is manufactured to tolerances of 1 micron and is hermetically sealed in a dust and moisture-free environment, use extreme caution when repairing it.

4-1-3 Note for Usage

(1) Be careful not to allow over-voltage and over-current. (2) If compressor is dropped or handled carelessly, poor

operation and noise may result.

(3) Use proper electric components appropriate to the

Particular Compressor in your product.

(4) Keep Compressor dry.

If Compressor gets wet (in the rain or a damp environment) and rust forms in the pin of the Hermetic Terminal, poor operation and contact may result.

(5) When replacing the Compressor, be careful that dust,

humidity, and soldering flux don’t contaminate the inside of the compressor. Dust, humidity, and solder flux contaminate the cylinder and may cause noise or improper operation even cause it to lock up.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device which uses ceramic material consisting of BaTiO

(2) The higher the temperature is, the higher the resistance

value. These features are used as a starting device for the Motor.

4-2-2 Role of PTC-Starter

(1) The PTC is attached to the Sealed Compressor and is

used for starting the Motor.

(2) The compressor is a single-phase induction motor.

Durign the starting operation, the PTC allows current flow to both the start winding and main winding.

4-2-3 PTC-Applied Circuit Diagram

● Starting Method for the Motor

Figure 11

4-2-4 Motor Restarting and PTC Cooling

(1) It requires approximately 5 minutes for the pressure to

equalize before the compressor can start.

(2) The PTC device generates heat during operation.

Therefore, it must be allowed to cool before the compressor can restart.

4-2-5 Relation of PTC-Starter and OLP

(1) If the compressor attempts to restart before the PTC

device is cooled, the PTC device will allow current to flow only to the main winding.

(2) The OLP will open because of the over current

condition. This same process will continue (3 to 5 times) when the compressor attempts to restart until the PTC device has cooled. The correct OLP must be properly attached to prevent damage to the compressor.

4-2-6 Note for Using the PTC-Starter

(1) Be careful not to allow over-voltage and over-current. (2) Do not drop or handle carelessly. (3) Keep away from any liquid.

If liquid such as oil or water enters the PTC, PTC materials may fail due to breakdown of their insulating capabilities.

(4) If the exterior of the PTC is damaged, the resistance

value may be altered. This can cause damage to the compressor and result in a no-start or hard-to-start condition.

(5) Always use the PTC designed for the compressor and

make sure it is properly attached to the compressor.

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Page 8

4-3 OLP (OVERLOAD PROTECTOR)

Part

Customer part number

Lot code/ date code

330 FBYY -S1 BOX98

12345678

Physical termination part number

Electrical

characteristics

part number

No. Name

Base, phenolic (UL 94 V-0 rated) Movable arm support, plated steel Stationary contact support, plated steel Heater support, plated steel Heater, resistance alloy Disc, thermostatic alloy Movable arm, spring temper copper alloy Contact, movable, silver on copper Contact, stationary, silver on copper Slug, plated steel Cover, polyester (UL 94 V -0 rated) Pin connector, plated copper alloy (To engage 2.33/2.66 mm dia. pin) Quick-connect terminal, brass, conforms to UL 310, MEMA DC-2, DIN 46344

(OVERLOAD PROTECTOR cross section)

4-3-1 Definition of OLP

(1) OLP (OVERLOAD PROTECTOR) is attached to the

Compressor and protects the Motor by opening the circuit to the Motor if the temperature rises and activating the bimetal spring in the OLP.

(2) When high current flows to the Compressor motor, the

Bimetal works by heating the heater inside the OLP, and the OLP protects the Motor by cutting off the current flowing to the Compressor Motor.

4-3-2 Role of the OLP

(1) The OLP is attached to the Sealed Compressor used

for the Refrigerator. It prevents the Motor Coil from being started in the Compressor.

(2) For normal operation of the OLP, do not turn the Adjust

Screw of the OLP in any way.

4-4 TO REMOVE THE COVER PTC

1) Remove the Cover Back M/C.

(2) Remove the screw on Cover PTC.

Figure 12

(3) Remove two Housings on upper part of Cover PTC.

(4) Take out the cover PTC from upper to lower position

like .

(5) Turn 45° in the direction of  and take it out.

(6) Assembly in reverse order of disassembly.

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5. CIRCUIT DIAGRAM

BEST MODEL

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Page 10

BETTER MODEL

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Page 11

6. TROUBLESHOOTING

Readings OK

Open or short

YES

Readings OK

Open or short

YES YES

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Power Source.

Check resistance of Motor Compressor.

Remove PTC-Starter from Compressor and measure voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC.

No Voltage.

Applied voltage isn't in range of Rating Voltage ±10%.

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

Check resistance of PTC-Starter.

Check resistance of two terminals in PTC-Starter.

Check OLP.

Check resistance of two terminals in OLP.

(Reated Voltage ±10%)?

OLP disconnected?

Advise customer that power supply needs to be checked by an electrician.

Replace Compressor.

Replace OLP.

Check connection condition.

Reconnect.

Replace PTC-Starter.

Replace OLP.

Check starting state.

Check the power supply under load. (Compressor attempting to re-start after being off for 5 minutes).

Supply voltage rating with ±10%.

Did compressor start?

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Compressor is OK

Replace the compressor

Page 12

6-2 PTC AND OLP

Shows continuity

Open

Normal operation of Compressor is impossible or poor.

Separate PTC-Starter from Compressor and measure resistance between No. 5 and 6 of PTC-Starter with a Tester.(Figure 13)

Separate OLP from Compressor and check resistance value between two terminals of OLP with a Tester. (Figure 14)

Observation value is 115V/60Hz : 6.8Ω±30%

The resistance value is 0Ω (short) or ∞ (open).

Check another electric component.

Replace OLP.

Check another electric component.

Replace PTCStarter

Figure 13

Figure 14

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Page 13

6-3 OTHER ELECTRIC COMPONENTS

▼ Not cooling at all

Compressor doesn't run.

▼ Poor cooling performance

Compressor runs poorly.

Check for open short or incorrect resistance readings in the following components

a. Starting devices

b. OLP

c. Compressor coil

d. Wiring harness

Check a starting voltage.

Check voltage at starting devices.

Check current at Compressor.

Cause

Short, open or broken.

Poor contact or shorted.

Coil open or shorted.

Poor contact or shorted.

Low voltage.

Poor or broken or open contact.

Shorted.

Replace indicated component.

Raise voltage.

Replace indicated component.

Fan motor doesn't run.

Heavy frost buildup on EVAPORATOR.

Check rating of OLP.

Check wiring circuit.

Check Fan Motor.

Check current flow in the following components: sensor Fuse-M

Check current flow in the Defrost Heater.

Lack of capacity.

Wire is open or shorted.

Coil is shorted or open.

Open.

Replace indicated component.

Replace Defrost Heater.

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Page 14

6-4 SERVICE DIAGNOSIS CHART

COMPLAINT POINTS TO BE CHECKED REMEDY

No Cooling.

Cools poorly.

Foods in the Refrigerator are frozen.

Condensation or ice forms inside the unit.

Condensation forms in the Exterior Case.

There is abnormal noise.

• Is the power cord unplugged from the outlet?

• Check if the power Switch is set to OFF.

• Check if the fuse of the power Switch is shorted.

• Measure the voltage of the power outlet.

• Check if the unit is placed too close to the wall.

• Check if the unit is placed too close to the stove,

gas cooker, or in direct sunlight.

• Is the ambient temperature too high or the room door closed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too often

or check if the door is sealed properly?

• Check if the Control is set to Warm position.

• Is food placed in the cooling air outlet?

• Check if the control is set to colder-position.

• Is the ambient temperature below 41°F(5°C)?

• Is liquid food sealed?

• Check if food put in the refrigerator is hot.

• Did you open the door of the unit too

often or check if the door is sealed properly?

• Check if the ambient temperature and humidity of the surrounding air are high.

• Is there a gap in the door gasket?

• Is the unit positioned in a firm and even place?

• Are any unnecessary objects placed

in the back side of the unit?

• Check if the Drip Tray is not firmly fixed.

• Check if the cover of the compressor enclosure

in the lower front side is taken out.

• Plug into the outlet.

• Set the switch to ON.

• Replace the fuse.

• If the voltage is low, correct the wiring.

• Place the unit about 10 cm from the wall.

• Place the unit away from these heat sources.

• Lower the ambient temperature.

• Put in foods after they have cooled down.

• Don't open the door too often and close

it firmly.

• Set the control to Recommended-position.

• Place foods in the high-temperature section.

(front part)

• Set the control to Recommended-position.

• Set the control to Warm-position.

• Seal liquid foods with wrap.

• Put in foods after they have cooled down.

• Don't open the door too often and close

it firmly.

• Wipe moisture with a dry cloth. It will disappear in low temperature and humidity.

• Fill up the gap.

• Adjust the Leveling Screw, and position

in a firm place.

• Remove the objects.

• Fix the Drip Tray firmly in the original position.

• Place the cover in its original position.

Door does not close well.

Ice and foods smell unpleasant

● Other possible problems:

Check if frost forms in the freezer.

Check the refrigeration system.

Check the Thermistor.

• Check if the door gasket is dirty with an item like juice.

• Is the refrigerator level?

• Is there too much food in the refrigerator?

• Check if the inside of the unit is dirty.

• Are foods with a strong odor unwrapped?

• The unit smells of plastic.

Not defrosting.

The system is faulty.

The operation of the Thermistor is incorrect.

• Clean the door gasket.

• Position in the firm place and level the

Leveling Screw.

• Make sure food stored in shelves does not prevent the door from closing.

• Clean the inside of the unit.

• Wrap foods that have a strong odor.

• New products smell of plastic, but this

will go away after 1-2 weeks.

Check Components of the defrosting circuit.

Perform sealed system repair.

Replace the Thermistor.

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Page 15

6-5 REFRIGERATING CYCLE

YES

▼ Troubleshooting Chart

CAUSE

PARTIAL Freezer Low flowing sound of A little higher • Refrigerant level is low due LEAKAGE compartment and Refrigerant is heard and than ambient • to a leak.

LEAKAGE

COMPLETE Freezer Flowing sound of refrigerant Equal to ambient • No discharging of Refrigerant. LEAKAGE compartment and is not heard and frost isn't temperature. • Normal cooling is possible by

RESTRICTED BY DUST

PARTIAL Freezer Flowing sound of refrigerant A little higher • Normal discharging of the RESTRICTION

WHOLE RESTRICTION

MOISTURE Cooling operation Flowing sound of refrigerant Lower than • Cooling operation restarts RESTRICTION

COMPRESSION

COMP- Freezer and Low flowing sound of A little higher • Low pressure at high side

DEFECTIVE

RESSION Refrigerator refrigerant is heard and ambient • of compressor due to low

STATE OF

THE UNIT

Refrigerator don't frost forms in inlet only. temperature. • Normal cooling is possible by cool normally. • restoring the normal amount of

Refrigerator don't formed. • restoring the normal amount of cool normally. • refrigerant and repairing the leak.

compartment and is heard and frost forms than ambient • refrigerant. Refrigerator don't in inlet only. temperature. • The capillary tube is faulty. cool normally.

Freezer compartment and Refrigerator don't cool.

stops periodically. is not heard and frost melts. ambient • when heating the inlet of the

don't cool. frost forms in inlet only. temperature. • refrigerant level.

STATE OF THE

EVAPORATOR

Flowing sound of refrigerant Equal to ambient • Normal discharging of the is not heard and frost isn't temperature. • Refrigerant. formed.

TEMPERATURE

OF THE

REMARKS

COMPRESSOR

• refrigerant and repairing the leak.

temperature. • capillary tube.

NO COMP- No compressing Flowing sound of refrigerant Equal to ambient • No pressure in the high RESSION operation. is not heard and there is temperature. • pressure part of the

no frost. • compressor.

▼ Leakage Detection

● Observe the discharging point of the refrigerant, which may be in the oil discharging part of the compressor and in a hole

in the evaporator.

Check if compressor runs.

Frost formed normally

Moisture Clog

Faulty Compressor.

Check Compressor

Check if frost forms in Evaporator.

Normal amount

Clogged by dust. Gas leakage.

No frost or frost forms in inlet only

Observe the discharged amount of Refrigerant.

Inject refrigerant in compressor and check cooling operation.

Frost formed normally

Check if oil leaks.

None or too much

(Find the leak and repair it)

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Page 16

▼ General Control of Refrigerating Cycle

NO. ITEMS UNIT STANDARDS PURPOSES REMARKS

Pipe and

piping system opening time

Welding

parts

Refrige-

ration Cycle

sealed

Evacuation time

Vacuum degree

Vacuum

Vacuum piping

Min.

Nitrogen pressure

Confirm N

2 leak

Min.

Torr

Pipe: within 1 hour. Comp: within 10 minutes. Drier: within 20 minutes.

Weld under Nitrogen atmosphere. (N

2 pressure:

0.1~0.2 kg/cm

)

Confirm the sound of pressure relief when removing the rubber cap. Sound: usable No sound: not usable

More than 40 minutes

Below 0.03 (ref)

High and low pressure sides are evacuated at the same time for models above 200 l.

Use R-134a manifold exclusively.

To protect moisture penetration.

To protect oxide scale formation.

To protect moisture penetration.

To remove moisture.

To protect mixing of mineral and ester oils.

The opening time should be reduced to a half of the standards during rain and rainy seasons (the penetration of water into the pipe is dangerous).

- Refer to repair note in each part.

- R-134a refrigerant is more susceptible to leaks than R-12 and requires more care during welding.

Do not apply force to pipes before and after welding to protect pipe from cracking.

- In case of evaporator parts, if it doesn't make sound when removing rubber cap, blow dry air or N

2 gas for more

than 1 min. and than use the parts.

Note: Only applicable to the model

equipped with reverse flow protect plate.

Vacuum efficiency can be improved by operating compressor during evacuation.

The rubber pipes for R-12 refrigerant will be melted when they are used for R-134a refrigerant (causes of leak.)

Refrigerant

weighing

Drier

replacement

Leak check

Pipe coupler

Outlet (Socket)

Plug

Use R-134a manifold exclusively.

R-134a manifold exclusively.

Use R-134a exclusively. Weighing allowance: ±5g Note: Winter: -5g

Summer: +5g

- Use R-134a exclusively for R-134a refrigerator.

Replace drier whenever repairing refrigerator cycle piping.

- Do not use soapy water for check. It may be sucked into the pipe by a vacuum.

To protect R-12 refrigerant mixing.

Do not mix with R-12 refrigerant.

To remove the moisture from pipe inside.

Defect in refrigerant leak area.

- Do not weigh the refrigerant at too hot or too cold an area. (77°F [25°C] is adequate.)

- Make Copper charging canister (Device filling refrigerant) Socket: 2SV Plug: 2PV R-134a Note: Do not burn O-ring (bushing)

during welding.

- Check for an oil leak at the refrigerant leak area. Use an electronic leak detector if an oil leak is not found.

- The electronic leak detector is very sensitive to halogen gas in the air. It also can detect R-141b in urethane. Practice many times before using this type of detector to avoid false readings.

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Page 17

7. OPERATION PRINCIPLE AND REPAIR METHOD OF ICE MAKER

• Adjusts EJECTOR to Start Position with power on.

Power On

Start Position

Ice Making

Mode

Harvest

Mode

Park Position

Fill

Test Mode

• Waits until water becomes cold after starting ice-making operation.

• Runs MOTOR to drop ice on tray from ICE BIN.

• Performs Ice Making Mode after supplying water by operating SOLENOID in ICE VALVE.

• With the detect lever, checks if the ICE BIN is full.

• To operate LINE and SERVICE, press and hold the Fill Key for 3 seconds. The ice maker will run through 3 stages: Harvest Fill Icemaking.

7-1 OPERATION PRINCIPLE

7-1-1 Operation Principle of Icemaker

1. Turning the icemaking stop switch off (O) stops the icemaking function.

2. Setting the icemaker switch to OFF and then turning it back on will reset the icemaker control.

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Page 18

7-2 CONTROL METHOD ACCORDING TO FUNCTIONS

Heater

off

30 sec.

10 sec.

Motor

Hall IC

Harvest mode end poing

2 ms

Ice-making sensor temperature is 50°F(10˚C) or more Max. 18 minutes After detect LEVER rises

7-2-1 Start Position

1. After POWER OFF or Power Cut, check EJECTOR's position with MICOM initialization to restart.

2. Control Method to check if it's in place: (1) EJECTOR is in place,

- The ejector must be in the park position before a new cycle can be initiated.

(2) EJECTOR isn't in place:

A. If there is no ice formed in the ice maker, it should take approximately 2 minutes for the ejector blades to cycle through

the harvest mode and return to the park position.

B. If there is ice formed in the ice maker, it can take up to 18 minutes for the ejector blades to cycle through the

harvest mode and return to the park position.

7-2-2 Ice Making Mode

1. The Ice Making Mode starts once the ejector is in the park position and the ice maker mold is filled with water.

2. The Ice Making Mode is terminated when the ice maker sensor reaches 19°F(-7°C). This may take between 1 and 4 hours.

7-2-3 Harvest Mode

1. The Harves mode is initiated when the temperature is satisfied with the shut-off arm in the down position.

2. Once the Harvest mode is initiated, the heater is operated for 30 seconds.

3. After 30 seconds, the ejector blades are operated. (Pin 10 of micom from the hall sensor will read 5V.)

4. Once the ejector blades have reached the park position and the hall sensor is reading 0V, water fill will be initiated.

NOTE : If no movement is detected from the shut-off arm (detect lever), that a Harvest mode will be attempted every 2 hours.

<fig1. Harvest mode process>

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Page 19

7-2-4 Fill / Park Position

1. Once a normal harvest mode has been completed, the water solenoid will be activated.

2. The amount of water is adjusted by pressing the water supply control Switch. This changes the time allowed for fill as illustrated in the chart.

Water supply amount TABLE

STAGE TIME TO SUPPLY INDICATIONS REMARKS

NOTE : Below is an example used by another vendor as an explanation of what is taking place.

6 sec.

7 sec.

8 sec.

9 sec.

10 sec.

The water amount will vary depending

on the water control Switch setting, as

well as the water pressure of the

connected water line.

- 19 -

Page 20

7-2-5 Function TEST

This is a compulsory operation for TEST, SVC, cleaning, etc. It is operated by pressing the water supply control KEY for 3 seconds.

2. It operates in the Icemaking mode, but not in the Ice-Removing mode or water supply process. (If there is an ERROR, it can only be checked in the TEST mode.)

3. If the water supply control KEY is pressed for 3 seconds in the Ice-Making mode (no matter what condition the IceMaking tray is in) the Ice-Removing operation starts immediately. Water is not yet frozen, so water is poured instead of ice. If the control doesn’t operate normally in the TEST mode, check and repair as needed.

4. After water is supplied, the normal CYCLE is followed: ice making → Harvest → Fill → Park position.

5. When Stage 5 is completed in the TEST mode, minimize MICOM in 5 seconds, the time needed to supply water resets to the previous status in the TEST mode.

Diagnosis TABLE

STAGE ITEMS INDICATOR REMARKS

HEATER

MOTOR

HALL IC (detection

of position) I

VALV E

HALL IC (detection

of full-filled Ice) II

reset

Mark previous status on TEST mode

7-3 DEFECT DIAGNOSIS FUNCTION

7-3-1 ERROR CODES shown on Ice Maker water supply control panel

Five seconds after heater starts, heater will go off if temperature recorded by sensor is 50°F(10°C) or lever is in up position.

Five seconds after heater starts, you can confirm that motor is moving.

You can confirm Hall Ic detection of position.

Two seconds after detection of initial position, you can confirm that valve is on.

You can check whether hall is sensing Full ice condition. (If there is a full-filled error, the fifth LED is not on.)

Five seconds after fifth stage is completed, the Icemaker reset at initial status.

NO DIVISION INDICATOR CONTENTS REMARKS

ERROR indicators in table can be checked only in TEST mode.

Normal

Ice-Making

Sensor

malfunction

Ice Maker Kit

malfunction

Mark time to

supply

Open or short-circuited wire

When ejector blades don’t reach

park position over 18 minutes

since Harvest Mode starts.

None

Display switch

operates properly

Make sure that the wire

on each sensor is

connected.

Defects of

HALL IC/MOTOR/

HEATER/RELAY

- 20 -

Page 21

8. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

Sears Best Model

Control range : 32°F ~ 47°F

0°C ~ 8°C

Control range : -6°F ~ 8°F

-21°C ~ -13°C

Sears Better Model

FREEZER

COLDER WARMER

°F/°C

0°F IS RECOMMENDED

TEMPERATURE

REFRIGERATOR

LOCK COLDER WARMER

HOLD 3 SECONDS

37°F IS RECOMMENDED

TEMPERATURE

FREEZER

OFF

TEMPERATURE

1234567

REFRIGERATOR

LOCK ADJUST

HOLD 3 SECONDS

4 IS RECOMMENDED

TEMPERATURE

WARMER COLDER

1234567

ADJUST

4 IS RECOMMENDED

WARMER COLDER

8-1 FUNCTION

8-1-1 Function

1. When the appliance is plugged in, it is set to "37 °F" for the Refrigerator and "0 °F" for the Freezer (set to "4" for Refrigerator and "4" for Freezer). You can adjust the Refrigerator and the Freezer control temperature by pressing the COLDER button or the COLD button.

2. When the power is initially applied or restored after a power failure, it is automatically reset to "37 °F" and "0 °F" (set to "4" and "4").

8-1-2 How to Change the Temperature Mode to °F / °C

1. The setting temperature mode can be changed to °F / °C by pressing the " °F / °C " button.

2. The initial setting is on °F. When the mode is changed the LED lights come on.

8-1-3 Key Lock

1. The key pads can be locked by pressing and holding the KEY LOCK button for 3 seconds.

2. The lock light will be displayed and the key pads will be inoperable.

3. Pressing and holding the KEY LOCK button for 3 seconds will reactivated the key pads.

8-1-4 OFF Function

1. To turn off the Best model, press and hold the °F/°C button for 3 seconds. To turn off the Better model, press and hld the OFF key for 3 seconds.

2. In the Off mode, the Best model will display OFF in the control panel. The OFF light will be displayed on the Vetter model.

3. To cancel the OFF function, press the same keys and hold for 3 seconds.

- 21 -

Page 22

8-1-5 Alarm for Open Door

Closed Open Closed Open

3 Times 3 Times 3 Times 3 Times

Closed

Within 1 min. 1 min.

30 sec 30 sec 30 sec

Freezer Door

or Refrigerator

Door

Buzzer

1. This feature sounds a buzzer when the freezer or refrigerator door is not closed within 1 minute after it is opened.

2. One minute after the door is opened, the buzzer sounds three times each for 0.5 seconds. These tones repeat every 30 seconds.

3. The alarm is cancelled when the freezer or the refrigerator is closed while the buzzer sounds.

8-1-6 Buzzer Sound

When the button on the front Display is pushed, a "Ding~" sound is produced.

8-1-7 Defrost Cycle

1. A defrost cycle will be initiated after 4 hours of accumulated compressor run time after the initial power up or a power

failure.

2. After the initial defrost, the defrost cycle is initiated after 7 hour of accumulated compressor run time.

3. The defrost cycle will be terminated once the defrost sensor reaches 50°F(10°C).

8-1-8 Electrical Parts Operates in Orders

Electrical parts such as COMP, defrost heater, freezer FAN, etc. operate in the following order to prevent noise and parts damage. Several parts are started at the same time at initial power on and are turned off together when TEST is completed.

OPERATING ORDERS

Temperature of Defrost Sensor is 113°F(45°C) or more (when unit is newly

Initial power on

purchased or when moved)

Temperature of defrost sensor is lower than 113 °F(45°C) (when power cuts, SERVICE)

Reset to normal operation from TEST MODE

POWER

in 1/2 second

Total load

OFF

in 1/2 second

COMP

in 1/2 second

Defrost

heater ON

COMP

in 1/2 second

in 7 minute

COMP

Freezer FAN

in 10 second

Freezer FAN

in 1/2 second

Defrost

heater OFF

Freezer FAN

- 22 -

Page 23

8-1-9 Defect Diagnosis Function

Defect code signsDefect code signs

FREEZER

COLDER WARMER

°F/°C

0°F IS RECOMMENDED

TEMPERATURE

REFRIGERATOR

LOCK COLDER WARMER

HOLD 3 SECONDS

37°F IS RECOMMENDED

TEMPERATURE

Defect code Panel

FREEZER

OFF

TEMPERATURE

1234567

REFRIGERATOR

LOCK ADJUST

HOLD 3 SECONDS

4 IS RECOMMENDED

TEMPERATURE

WARMER COLDER

1234567

ADJUST

4 IS RECOMMENDED

WARMER COLDER

1. Defect diagnosis functions are easy SVC when defects occur which can affect product performance.

2. When a defect occurs, the buttons will not operate; but the tones. such as "ding". will sound.

3. When the defect CODE removes the sign, it returns to normal operation (RESET).

4. The defect CODE shows on the refrigerator DISPLAY as temperature LED, and the other LED turns off.

-Show ERROR CODE on Refrigerator Temperature Panel and Freezer Temperature panel.

NO ITEM

Freezer sensor

malfunctions

ERROR CODE

REF. TEMP. PANEL FRZ. TEMP. PANEL

Refrigerator

sensor

malfunctions

Defrost sensor

malfunctions

Room

Temperature

sensor

malfunctions

Defrosting

malfunctions

On LED CHECK mode

ERROR CODE sign

ERROR CODE on Freezer Temperature panel

NO ITEM

F1 F2 F3 F4 F5 F6 F7

DEFECT SIGNS

CONTENTS REMARKS

Open or short-circuited wire

2 hours after defrosting

starts, the sensor is not

above 50°F(10°C)

Temperature FUSE cuts off,

HEATER cuts off, DRAIN is

clogged, HEATER starts,

RELAY malfunctions

CONTENTS REMARKS

Inspect

connecting wires

on each sensor

:ON :OFF

Freezer sensor

malfunctions

Refrigerator sensor

malfunctions

Defrost sensor

malfunctions

Room

Temperature

sensor

malfunctions

Defrosting

malfunctions

On LED CHECK mode

Open or short-circuited wire

- 23 -

2 hours after defrosting starts, the sensor is not

above 50°F(10°C)

Inspect

connecting wires

on each sensor

Temperature FUSE cuts off,

HEATER cuts off, DRAIN is

clogged, HEATER starts,

RELAY malfunctions

Page 24

8-1-10 TEST Mode

1. The Test mode allows checking the PCB and the function of the product as well as finding out the Defective part in case of an error.

2. The test button is on the main PCB of the refrigerator (Test S/W). The test mode will be cleared in 2 hours regardless of the type of test mode.

3. While in the test mode, the function control button will not operate, though the recognition tone (beep~) sounds.

4. After exiting the test mode, be sure to reset by unplugging and then plugging in the appliance.

5. If an error (such as a sensor failure) is detected while in the test mode, the test mode is cleared and the error code is displayed.

6. While an error code is displayed, the test mode will not be activated even if the test button is pushed.

MODE MANIPULATION CONTENTS REMARKS

TEST1

TEST2

Reset

Push the test button once.

Push the test button once while in TEST MODE 1.

Push the test button once while in TEST MODE 2.

1. Continuous operation of the COMP

2. Continuous operation of the freezer fan

3. STEPPING DAMPER OPEN

4. Defrosting Heater OFF

5. Every DISPLAY LED ON

1. COMP OFF

2. Freezer FAN OFF

3. STEPPING DAMPER CLOSE

4. Defrosting heater ON

5. DISPLAY LED shows 222

Reset to the default setting

Reset if the temperature of the Defrosting sensor is 50°F(10°C) or more.

The compressor will Start after a 7-minute delay.

- 24 -

Page 25

8-2 PCB FUNCTION

8-2-1 Power Circuit

1. Power is supplied to the control board at pins 1 and 3 of connector #1.

- 25 -

Page 26

8-2-2 Load / Buzzer Drive & Open Door Detection Circuit

1. Load Drive Condition Check

To measure outputs of the control board, check voltages between the pins for the following components:

Circuit Pin Number Pin Number Output Voltage

Compressor Con2 pin7 Con1 pin1 115 VAC

Condenser fan Con2 pin7 Con1 pin1 115 VAC

Evaporator fan Con2 pin5 Con1 pin1 115 VAC

Defrost heater Con2 pin3 Con1 pin1 115 VAC

F,R-lamp Con2 pin1 Con1 pin1 115 VAC

NOTE: When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the freezer/refrigerator turns

off automatically.

- 26 -

Page 27

2. Open Door Circuit (Door Monitor Circuit)

Freezer or Refrigerator Measurement between pins 4 and 3 at Con 5

Both Closed 0 volts

One door open 5 volts

- 27 -

Page 28

8-2-3 Temperature Sensor Circuit

Voltage supplied to each sensor wil range between 0.5 volts -22°F(-30°C) and 4.5 volts 122°F(50°C) depending upon the temperature in the compartments. A measurement of 0 volts indicates a short in the sensor circuit. A measurement of 5 volts indicates an open in the sensor circuit.

- 28 -

Page 29

8-2-4 Motor Damper Circuti

A reversible DC motor is used to open and close the damper.

To open the damper, push test button once.

To close the damper, push test button twice.

8-2-5 Damper Heater

* The damper heater is attached to the baffle and always will be on if the unit is powered on. The damper heater uses

12VDC.

- 29 -

Page 30

8-2-6 Key Button Input & Display Light On Circuit

LED CHECK MODE: When the COLDER(ADJUST) button in the refrigerator temperature control and the COLDER(ADJUST) button in the freezer temperature control are pushed and held for 1 second or longer, every LED on the display turns on at the same time. When the buttons are released, the previous mode is restored.

Best Model Better Model

- 30 -

Page 31

8-3 RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE RESISTANCE OF FREEZER RESISTANCE OF REFRIGERATOR

- 20 ˚C (-4 °F) 22.3 KΩ 77 KΩ

- 15 ˚C (5 °F) 16.9 KΩ 60 KΩ

- 10 ˚C (14 °F) 13.0 KΩ 47.3 KΩ

- 5 ˚C (23 °F) 10.1 KΩ 38.4 KΩ

0 ˚C (32 °F) 7.8 KΩ 30 KΩ

+ 5 ˚C (41 °F) 6.2 KΩ 24.1 KΩ

+ 10 ˚C (50 °F) 4.9 KΩ 19.5 KΩ

+ 15 ˚C (59 °F) 3.9 KΩ 15.9 KΩ

+ 20 ˚C (68 °F) 3.1 KΩ 13 KΩ

+ 25 ˚C (77 °F) 2.5 KΩ 11 K Ω

+ 30 ˚C (86 °F) 2.0 KΩ 8.9 KΩ

+ 40 ˚C (104 °F) 1.4 KΩ 6.2 KΩ

SENSOR & DEFROST SENSOR

+ 50 ˚C (122 °F) 0.8 KΩ 4.3 KΩ

• The resistance of the SENSOR has a ±5% common difference.

• Measure the resistance of the SENSOR after leaving it for over 3 minutes in the measuring temperature. This delay is necessary due to sensor response speed.

• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.

- 31 -

Page 32

Not defrosting

Not cold enough

Not Cooling

not operating

correctly

Electronic Display

COMPLAINT

8-4 TROUBLESHOOTING

1. Freezer has too

much frost

4. Damper not opening or internal air flow blocked

5. Sensor not operating properly

6. Door not sealing

7. Evaporator Frosted up

1. Open in defrost circuit

2. Defrost sensor not operating correctly

3. Defrost drain clogged

8. Sealed System related problem

2. Display on

compressor is

operating

1. Condenser fan motor not operating

2. Condenser coils blocked

3. Evaporator fan motor not operating

operating

1. Display on but

compressor not

1. Compressor not operating

2. Open in compressor circuit

2. Partial or

abnormal display

1. Supply voltage not within specifications

2. Open in wiring harness from PWB board

3. Open in door monitor switch circuit

1. No Display at all

SYMPTOM POSSIBLE CAUSES SOLUTION

1. Supply voltage not within specifications

2. Open in wiring harness from PWB board

1. Check defrost heater and circuit using Test Key

2. Check sensor

3. Check drain

7. Check defrost circuit components wiring, etc.

1. Check condenser fan motor and wiring circuit

2. Check air flow across condenser

3. Check evaporator fan motor and wiring circuit

4. Check damper motor circuit

5. Check refrigerator and freezer sensors

6. Check for proper door esal

1. Check supply voltage to refrigerator

2. Check for open on OLP, PTC, compressor,

1. Check for compressor operation by using the test

key on main circuit board

2. Check wiring and connectors to and from PWB

board

3. Check door monitor circuit

1. Check supply voltage to refrigerator

2. Check wiring and connectors to PWB board

- 32 -

Page 33

8-5 MAIN PWB ASSEMBLY AND PARTS LIST

8-5-1 Main PWB Assembly

connector 1

connector 2

connector 5

connector 6

connector 4

connector 3

- 33 -

Page 34

9. EXPLODED VIEW & REPLACEMENT PARTS LIST

106A

315A

401A

304A

501A

411A

410G

501F

S01

309A

318A

308A

S07

314A

307A

312A

317A

S06

S09

310A

327A

103A

105A

301A

283E

120A

103B

328A

145B

145A

282H

B02

S13

282B

406B

418A

281A

B01

281B

103C

305B

305C

B03

S19

S17

S18

175A*

120B

503B

113A

503D

503C

503D

158C

113D

409B

113B

113C

158A

S16

S38

105F

S10 S10

B04

323B

329C

420A

319A

S08

319C

S14

612A

610A

S14

282E

S02

S05

S04

283B

S15

104B

S14

104B

CASE PARTS

CAUTION: Use the part number to order part, not the position number.

- 34 -

Page 35

FREEZER PARTS

405C

404A

409A

158E

405A

S20

330B

S21

332A

408A

149A

149B

143A*

S14

284C

284A

329A

116A

S22

315B*

136A*

143B*

CAUTION: Use the part number to order part, not the position number.

- 35 -

Page 36

REFRIGERATOR PARTS

170A

128A

146A*

147C*

147B

147A*

147D*

141D

149C

141E

149E*

142B

142E

S24

142D

141B

128B

128C*

128D*

278C*

278G*

141C

141A

141C

141A

141B

S24

140D

140A

140B

140E

S24

160B

167B

161A

151A

155B

151A

161A

160B

151C

CAUTION: Use the part number to order part, not the position number.

▲

, * : On some models

- 36 -

Page 37

DOOR PARTS

233A

203A

200A

201A

231A

281D

205B

205D

205A

205C

281E

241A

241B

241E

241C

241D

237A

281E

205B

244A

S25

244B

S25

212A

S25

210A

S26

210B

201A

281D

281E

244B

212A

607A

244C

243A

283F

231A

281D

281E

S27

244B

244A

607A

244C

230A

S25

CAUTION: Use the part number to order part, not the position number.

▲

, * : On some models

- 37 -

Page 38

ICE MAKER PARTS

131A

600A

616E

623A

S30

622A

616D

619A

602A

S29

S31

S28

CAUTION: Use the part number to order part, not the position number.

- 38 -

Page 39

ICE MAKER PARTS (LOC#600A)

501G

120H

629B

629C

629D

629E

613B

275C

613A

628E

404X 404Y 404Z

405D

628C

276A

510A

125D

S32

S33

S34

S35

S36

629A

280E

501B

628A

628B

273A

275D

406D

S37

S36

NON SERVICEABLE PARTS

- 39 -

Page 40

P/No. 3828JL8008A MARZO, 2003 Printed in México