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REFRIGERATOR SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
Ref. No. GR-262SQ GR-292SQ

MODEL: GR-262SQ GR-292SQ

COLOR: SUPER WHITE

CONTENTS

SAFETY PRECAUTIONS..... 2 SERVICING PRECAUTIONS..... 3 SPECIFICATIONS..... 4 PARTS IDENTIFICATION..... 5 DISASSEMBLY...... 6-7 DOOR...... 6 DOOR SWITCH...... 6 FAN AND FAN MOTOR..... 6 DEF' CONTROL ASM...... 7 REFRIGERATOR ROOM LAMP..... 7 CONTROL BOX-R..... 7 REPLACEMENT OF DOOR OPENING TYPE....8-9 ADJUSTMENT...... 10-11 COMPRESSOR..... 10 PTC-STARTER..... 10 OLP (OVER LOAD PROTECTOR)..... 11 CIRCUIT DIAGRAM..... 11 TROUBLESHOOTING...... 12-17 COMPRESSOR AND ELECTRIC COMPONENTS.... 12 PTC AND OLP...... 13 ANOTHER ELECTRIC COMPONENT.... 14 SERVICE DIAGNOSIS CHART..... 15 REFRIGERATING CYCLE..... 16-17 DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM....18-34 EXPLODED VIEW..... 35-37 REPLACEMENT PARTS LIST..... 38-

SAFETY PRECAUTIONS

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.

SERVICING PRECAUTIONS

Air Recharging in Compressor
Test the refrigeration by connecting it electrically before refilling operation. It is necessary to ascertain the function of the motor-compressor and identify the defects immediately. If the defects have been found, empty the old system of eventual R-134a 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 extension completely with male Hansen and last, solder it to the same tube again. (Figure 2)
POINT TO BE BROKEN CHARGE TUBE EXTENSION FEMALE HANSEN
vacuum operation is over, add the quantity in grams of R134a to the refrigerant system. Remember that every system has an exact quantity of R-134a with a tolerance of 5 grams that can be added. (Figure 4)

TO THE R-134a CYLINDER

MALE HANSEN
TO THE REFRIGERATION SYSTEM

Figure 4

SERVICE TUBE EXTENSION SOLDERING POINT

Figure 1

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 heating 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)
Before performing this operation (if the vacuum pump and refilling cylinder are connected), make sure that the valve placed between the vacuum pump and refilling tube are closed to keep the Freon for adding to the system. (Figure 5)
FILLING OR CHARGE TUBE VALVE TO BE OPENED WHEN REFILLING

TO THE CHARGE CYLINDER

VALVE TO BE CLOSED AFTER VACUUM
TO THE VACUUM PUMP PRESSURE GAUGE

TO THE VACUUM PUMP

Figure 5
Figure 3 Air evacuating from the system begins so 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 mm 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 and to stop the vacuum pump will be necessary and 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 leakfinder. 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

In addition, check the graduated scale on the cylinder for the quantity of R-134a 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 R-134a 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-compressor. Therefore, proceed by adding 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 making the pressure go down again. Regulate the valve again, maintaining the same manner until reaching to the quantity of R-134a established for the system being charged. When the system is running, the suction pressure must be stabilized between 0.30 to 0.6 atmosphere.

1. SPECIFICATIONS

1-1 GR-262
ITEMS FREEZER NET CAPACITY REFRIGERATOR (l) TOTAL DIMENSIONS (mm) GR-262Q(V)C 540(W)X628(D)X1510(H) NET WEIGHT (kg) COOLING SYSTEM TEMPERATURE CONTROL FREEZER REFRIERATOR 46 Fan Cooling Knob Shutter Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE INNER CASE INSULATION Coated Steel Sheet ABS Polyurethane Foam ICE TRAY ICE BANK COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE (*) : OPTION 1 Piece (*2) 1 Piece P.T.C Starting Type Fin Tube Type Pipe On Sheet Type R134a (120g) FREOL 22G (210cc) L-CORD, PLATE HEATER 61 SHELF GR-262S(V)Q 540(W)X610(D)X1510(H) REFRIGERATOR VEGETABLE TRAY EGG TRAY 2 EA Drawer Type 1 Piece SPECIFICATIONS ITEMS FREEZER SPECIFICATIONS 1 EA

1-2 GR-292

ITEMS FREEZER NET CAPACITY REFRIGERATOR (l) TOTAL DIMENSIONS (mm) GR-292Q(V)Q 540(W)X628(D)X1600(H) NET WEIGHT (kg) COOLING SYSTEM TEMPERATURE CONTROL FREEZER REFRIERATOR 49 Fan Cooling Knob Shutter Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE INNER CASE INSULATION Coated Steel Sheet ABS Polyurethane Foam ICE TRAY ICE BANK COMPRESSOR EVAPORATOR CONDENSER REFRIGERANT LUBRICATING OIL DEFROSTING DEVICE (*) : OPTION 1 Piece (*2) 1 Piece P.T.C Starting Type Fin Tube Type Pipe On Sheet Type R134a (120g) FREOL 22G (210cc) L-CORD, PLATE HEATER 61 SHELF GR-292S(V)Q 540(W)X610(D)X1600(H) REFRIGERATOR VEGETABLE TRAY EGG TRAY 2 EA Drawer Type 1 Piece SPECIFICATIONS ITEMS FREEZER SPECIFICATIONS 1 EA

2. PARTS IDENTIFICATION

FREEZER COMPARTMENT
Twisting Ice Service (Optional) or General Type Ice Making Freezer Shelf Freezer Temperature Control Knob Freezer Door Rack

REFRIGERATOR COMPARTMENT

Chilled Compartment Refrigerator Temperature Control Micom Shelves Lamp Deodorizer (Optional) Vegetable Drawer Used to keep fruits and vegetables, etc. fresh and crisp. Leveling Screws Cover Lower (Optional) Refrigerator Door Rack Egg Storage Rack
Refrigerator Door Rack (Optional)
NOTE : This is a basic model. The shape of refrigerator is subject to change.

3. DISASSEMBLY

3-1 DOOR

q Freezer

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.
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.

HINGE COVER BOLT HINGE

Figure 9
Figure 6 3. Pull out the door gasket to remove from the door foam Ass'y.

GASKET

3-3 THERMISTOR
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. Separate the Thermistor and Control Box-R. 7. Separate the Thermistor and Display PCB.
INSU'MULTI DUCT DISPLAY PCB THERMISTOR CONT' BOX-R

Figure 7

Refrigerator Door 1. Loosen hexagonal bolts fixing the lower hinge to the body to remove the refrigerator door only.

COVER LAMP-R

Figure 10

3.4 FAN AND FAN MOTOR

LOWER HINGE
1. Remove the freezer shelf. 2. Separate the twist by pulling right. 3. Loose 1 screw. 4. Pull out the Grille Fan and Shroud-F.

Figure 8

2. Pull out the door gasket to remove from the door foam Ass'y.

Figure 11

5. Disconnect the housing of lead wire. 6. Separate the Fan Assy. 7. Loose 2 screw fixed to the Bracket. 8. Pull out Shroud-F remove the Fan Motor Assy. 9. Separate the Motor Bracket and Rubber.

FAN MOTOR SHROUD-F

3-6 REFRIGERATOR ROOM LAMP
1. Remove the cover lamp-R by pulling with a '' type driver. 2. Remove the lamp-R by turning.

REFRIGERATOR ROOM LAMP

BRACKET FAN

Figure 17

GRILLE FAN

Figure 12

3-7 CONTROL BOX-R 3-5 DEF' CONTROL ASM
Def control ASM consists of Defrost Sensor and FUSEM. Defrost Sensor functions to defrost automatically and it is attached to the Evaporator and the metal side of the case senses Temp. Fuse-M is a kind of safety device for preventing overheating of the Heater when defrosting. At the temperature of 72C, it stops the emission of TEMP from the Defrost Heater. 1. Pull out the shroud-F after removing the Grille Fan. (Figure 13) 2. Separate the connectors connected with the Def Control ASM and replace the Def Control ASM after cutting the Tie Wrap. (Figure 14)

SHROUD-F DEF CONTROL ASM

1. Remove the Cover Lamp-R.

CONTROL BOX-R

COVER LAMP

Figure 18

2. Loosen 2 screws. 3. Full the Control Box-R. 4. Separate the lead wire Housing.

Figure 13

Figure 14
3-8 REPLACEMENT OF DOOR OPENING TYPE
- Converting Door is Optional
Precaution 1. Before replacing the door opening type, first of all, you should take out foodstuffs and accessories like shelves or trays, and so on which are not fixed in the refrigerator. 2. Use the '+' Driver, Bolt Driver, Torque Wrench or Spanner to fix or remove the bolt. 3. Be careful not to fall down the refrigerator in disassembling or assembling the Hinge Lower and the Adjustable Screw Asm. Don't lay the refrigerator down in working with it, it will cause to get out of order. 4. Be careful not to drop the door in disassembling or assembling the freezer or the refrigerator door. 5. This refrigerator, according to the install position or user's liking, can be used as the type of opening from the right or the left.
a HOW TO REPLACE THE DOOR OPENING TYPE
Separate the Cap and Hinge Upper.
Separating the Freezer Door.
Separating the Hinge-C and the Refrigerator Door.
Separating the Hinge Lower.
Assembly. 5 Move the Position of Adjustable Screw
6 Assemble the Hinge Lower.
Door. 7 Move the Cap , Bracket of the Refrigerator
Move the Cap and Assemble 8 After removingthe washer. the Hinge-C.
Assembe the 9 Opening Type.Door Stopper-F for Right
the Door 10 Move. Cap and Assemble the Freezer
11 Move the Pin Position of the Hinge Upper.
12 Assemble the Hinge Upper and the Cap.

4. ADJUSTMENT

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.

q According

4-2-3 PTC-Applied Circuit Diagram to Starting Method of Motor
OVERLOAD PROTECTOR C PTC 5 S COMPRESSOR MOTOR M M S HERMETIC TERMINAL

PTC STARTER RSIR

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 circuitshort 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.

4-2 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 singlephase induction Motor. For normal operation of single-phase induction motor, in the starting operation flows in both main coil and subcoil. 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.

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4-3 OLP (OVER LOAD PROTECTOR)
4-3-1 Definition of OLP (1) OLP (OVER LOAD PROTECTOR) 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

Cause.

Poor contacting. Shorted or broken. Poor contacting or shorted. Coil shorted. Poor contacting or shorted. Replace each component.
Running state of Compressor is poor.
Check a starting voltage. Check if current flows to starting devices. Check current flowing in sub-coil of Compressor.
Low voltage. Poor contacting and broken. Shorted.
Raise the voltage. Replace each component.

Check capacity of OLP.

Lack of capacity. Coil of motor Compressor. Replace the compressor.
The items described above are normal. w Cooling ability is poor

Fan motor doesn't run.

Check current flowing in door S/W. Check current flowing in the Fan Motor. Check current flowing of the following components. Def. Sensor FUSE-M Check current flowing of the following components. L-Cord Plate Heater
Poor contacting. Replace each component. Coil is shorted.
Much frost are sticked to the EVAPORATOR.

Shorted.

Replace each component.

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6-4 SERVICE DIAGNOSIS CHART
COMPLAINT Cooling is impossible. POINTS TO BE CHECKED Is the power cord unplugged from the outlet? Check if the power S/W is set to OFF. Check if the fuse of power S/W is shorted. Measure the voltage of power outlet. Check if the set is placed close to wall. Check if the set is placed close to stove, gas cooker and direct rays. Is the ambient temperature high or the room door closed? Check if putting in hot foods. Did you open the door of the set too often or check if the door is closed up? Check if the Control is set to "Min". Are foods placed in cooling air outlet? Check if the Display LED is set to "Max". Is the ambient temperature below 5C? Is watery foods kept? Check if putting in hot foods. Did you open the door of the set too often or check if the door is closed up. Check if ambient temperature and humidity of surroumcling air are high. Is the gap in the door packed? Abnormal noise generates. Is the set positioned in a firm and even place? Does any unnecessary objects exist in the back side of the set? Check if the Drip Tray is not firmly fixed. Check if the cover of mechanical room in below and front side is taken out. To close the door is not handy. Check if the door packing becomes dirty by filth such as juice. Is the set positioned in a firm and even place? Is too much food putted in the set? Ice and foods smell unpleasant. Check if the inside of the set becomes dirty. Did you keep smelly foods without wraping? It smells plastic. REMEDY Plug to the outlet. Set the switch to ON. Replace a regular fuse. If voltage is low, wire newly. Place the set with the space of about 10cm. Place the set apart from these heat appliances. Make the ambient temperature below. Put in foods after they get cold. Don't open the door too often and close it firmly. Set the control to mid-position. Place foods in high temperature section. (Front Part) Set the Display LED to "Mid". Set the Display LED to "Min". Seal up watery foods with wrap. Put in foods after they get cold. Don't open the door too often and close it firmly. Wipe dew with a dry cloth. This happening is solved in low temperature and humidity naturally. Fill up the gap. Adjust the Adjust Screw, and position in the firm place. Remove the objects. Fix it firmly on an original position. Place the cover at an original position. Clean the door packing. Position in the firm place and adjust the Adjust Screw. Keep foods not to reach the door. Clean the inside of the set. Wrap smelly foods. The new products smell plastic, but it is removed after 1-2 weeks.

Cooling ability is poor.

Foods in the Refrigerator are frozen. Dew or ice forms in the chamber of the set. Dew forms in the Out Case.
In addition to the items described left, refer to the followings to solve the complaint. Check if dew forms in the Freezer. Defrosting is poor. Replace the Components of defrosting circuit.
Check Refrigerating Cycle.

The cycle is faulty.

Repair the cycle.

Check the Thermistor

The operation of the Thermistor is poor.

Replace the Thermistor.

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6-5 REFRIGERATING CYCLE

w Troubleshooting Chart
PARTIAL LEAKAGE LEAKAGE CLOGGED BY DUST DEFECTIVE COMPRESSION

STATE OF THE SET

Freezer room and Refrigerator don't get cold normally. Freezer room and Refrigerator don't get cold normally. Freeze room and Refrigerator don't get cold normally. Freezer room and Refrigerator don't get cold. Cooling operation stops periodically. Freezer and Refrigerator don't get cold. No compressing operation.

STATE OF THE EVAPORATOR

Low flowing sound of Refrigerant is heard and frost forms in inlet only
TEMPERATURE OF THE COMPRESSOR
A little high more than ambient temperature. Equal to ambient temperature.

REMARKS

A little Refrigerant discharges. Normal cooling is possible when injecting Refrigerant of regular amount. No discharging of Refrigerant. Normal cooling is possible when injecting Refrigerant of regular amount. Normal discharging of refrigerant. The capillary tube is faulty. Normal discharging of Refrigerant. Cooling operation restarts when heating the inlet of capillary tube. The pressure of high pressure part in compressor is low. No pressure of high pressure part in compressor.

WHOLE LEAKAGE

Flowing sound of Refrigerant is not heard and frost isn't formed. Flowing sound of Refrigerant is heard and frost forms in inlet only. Flowing sound of Refrigerant is not heard and frost isn't formed. Flowing sound of Refrigerant is not heard and frost melts. Low flowing sound of Refrigerant is heard and frost forms in inlet only. Flowing sound of Refrigerant is not heard and no frost.

PARTIAL CLOG

A little high more than ambient temperature. Equal to ambient temperature. Low than ambient temperature A little high than ambient temperature. Equal to ambient temperature.
WHOLE CLOG MOISTURE CLOG COMPRESSION NO COMPRESSION

w Leakage Detection

q Observe
discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
Whether Compressor runs or not.

Whether frost forms or not in Evaporator.
No frost or forms in inlet only
Whether oil leaks or not.
Frost formed normally Normal amount
Observe the discharging amount of Refrigerant. No or much amount

Moisture Clog.

Faulty Compressor.
Inject Refrigerant to Compressor and check cooling operation.

Check Compressor

Clogged by dust. Normal frost formed in Evaporator
Gas leakage. (Check the leakage point)

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w General Control of Refrigerating Cycle

WELDING ROD

CONTENTS AND SPECIFICATIONS
(1) H 30 (1) Chemical Ingredients (1) Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% (1) Brazing Temperature: 710~840C (2) Bcup-2 (1) Chemical Ingredients (1) Cu: About 93% (1) P: 6.8~7.5% (1) The rest: within 0.2% (1) Brazing Temperature: 735~840C (1) Ingredients and how to make (1) Borax 30% (1) Borax 35% (1) Fluoridation kalium: 35% (1) Water: 4% (1) Mix the above ingredients and boil until (1) they are transformed into liquid. (1) Assemble the drier within 30min. (1) after unpacking. (2) Keep the unpacked drier at the temperature of 80~100C. (1) When measuring with pirant Vacuum (1 )gauge of charging M/C, vacuum (1 )degree is within 1 Torr. (2) If the vacuum degree of the cycle inside is (2) 10 Torr. below for low pressure and 20 Torr. (2) for high pressure, it says no vacuum (2) leakage state. (3) Vacuum degree of vacuum pump must be (3) 0.05 Torr. below after 5 min. (4) Vacuum degree must be same to the value described item (2) above for more than 20 min. (1) The pressure of dry air must be more than 12~16Kg/cm2 (2) Temperature must be more than 70C. -20 (3) Keep the pressure to 12~6Kg/cm2 also (3) when substituting dry air for Nitrogen Gas. (1) Check if gas leaks with soapy water. (2) Replace Quick Coupler in case of leakage.
Recommend H34 containing 34% Ag in the Service Center.
Make amount for only a day. (1) Holding period: 1 day Close the cover of container to prevent dust putting in the FLUX. Keep it in a stainless steel container.

DRIER ASM

Don't keep the drier in a outdoor because humidity damages to it.

VACUUM

Apply M/C Vacuum Gauge without fail. Perform vacuum operation until a proper vacuum degree is built up. If a proper vacuum degree isn't built up, check the leakage from the Cycle Pipe line part and Quick Coupler Connecting part.

DRY AND AIR NITROGEN GAS

NIPPLE AND COUPLER PIPE
Check if gas leaks from connecting part of Coupler.
(1) Put all Joint Pipe in a clean box and (1) cover tightly with the lid so that dust or (1) humidity is not inserted.

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7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM
The following description is basically for GR-262/GR-292. For the other models, refer to the diagram of the entire PCB 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 is set to MediumMedium/HighHighLowMedium/LowMedium in order. 2. When the power is initially applied or restored after a power failure, it is automatically set to Medium.
Low Temp Control TEMP(C) ROOM 6

Medium/ Low

Medium

Medium/ High

3 REFRIGERATOR

- 18 -

7-1-2 DEFROSTING
1. The defrosting is performed each time when the total running time of the compressor reaches 7 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 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 If the temp of the defrosting sensor is 25 C or above (For the initial use after the purchase or grounding) When the power is turned on

Operating Sequence

POWER ON

in 0.5 sec

COMP & COOLING FAN ON
If the temp of the defrosting sensor is below 25 C (After a power failure or SVC)

DEFROSTING HEATER ON

in 10 sec

DEFROSTING HEATER OFF

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7-1-4 ERROR DIAGNOSTIC MODE
1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while operating the product. 2. Even if the 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 appliance returns to the normal condition (Reset). 4. The error code is displayed by the refrigerator temp indication LED on the display of the refrigerator while the remaining LEDs are off.

: BLINK(1sec on/1sec off)
NO Error Faulty refrigerator(R) sensor (on the control box of the refrigerator) Faulty defrosting sensor Error Code Display R1 1. R2 R3 Cut or short-circuited wire of refrigerator sensor Cause

: NORMAL

State of Operation with Error Comp / Cooling fan 15 min ON/ 15 min OFF Defrosting heater
Cut or short-circuited wire of defrosting sensor Cut or disconnected wire of defrosting heater or temperature fuse(indicated at least 2 hours later after the error occurs)

No defrosting

Defrosting failure

- 20 -

7-2 PCB FUNCTION

7-2-1 POWER CIRCUIT

The secondary part of the TRANS is composed of the power supply for the display and relay drive (12Vdc) and that for the MICOM and IC (5Vdc). The voltage for each part is as follows. PART VOLTAGE VA Vac CE Vdc CEVdc
VA1 is a part for preventing the over voltage and noise. When 385V or higher power is applied, 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 TRANS.

- 21 -

7-2-2 OSCILLATION CIRCUIT
This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data from and to the inside logic elements of the IC1(MICOM). Be sure to use the authentic parts since the calculating time by the IC1 may be changed or it will not work if the 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 10ms of power supply, LOW voltage is applied to the MICOM RESET terminal. During a normal operation, 5V is applied to the RESET terminal. (If a trouble occurs in the RESET IC, the MICOM will not work.)

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7-2-4 LOAD DRIVE CIRCUIT
1. Load Drive Condition Check
Load Type Measurement Location ON Condition OFF
Comp, Freezer Fan Motor A 1V or below 12V

Defrosting Heater B

REMEDY

Certify Fuse. Certify outlet Voltage. Use boosting TRANS. Reconnect CONNECTOR.

Replace TRANS.

COOLING is poor

NO COOLING

1. COMPRESSOR operates?

Check the MAIN PCB.

Replace COMPRESSOR.
Replace OLP, PTC. Replace MAIN PWB RY1
2. Whether refrigerant leaks or leaks or not.
FREEZER TEMPERATURE is poor
1. Whether FAN MOTOR operates or not.
Measure the amount of frost sticking on EVA and the surface temperature of condenser pipe. Check the MAIN PCB.
Certify the black wire of MAIN PWB CONNECTOR (CON1) Remedy the leaking part and reaching Refrigerant.
FAN MOTOR is poor DOOR LINE contact. CONETTING WIRE is poor.
Replace FAN MOTOR. Replace DOOR LINER. Certify MOTOR and the connection of the black wire of MAIN PWB CONNECTOR. (CON1) 2. DEFROSTING normal? 3. SENSOR normal? Certify the amount of frost sticking on EVA. Check resistance the SENSOR in the Refrigerator DEFROSTING is poor. SENSOR RESISTANCE is poor.
See the DEFROSTING trouble. Replace SENSOR

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CLASSIFICATION COOLING is poor. TEMPERATURE is poor. is sufficient? 2. Cool air of FAN MOTOR is is normal? REFRIGERATOR 1. FREEZER TEMPERATURE See "FREEZER

CONTENT

Certify the attaching state
TEMPERATURE is poor". Certify the amount of cool air and its speed touching check supplied into REFRIGERATOR EVA frozen. Check the MAIN PCB. HEATER disconnection. TEMPERATURE FUSE disconnection. Connection is poor. FAN MOTOR is poor.

of DOOR.

Replace FAN MOTOR.
Passage of cool air blocking.

Remove impurities.

DEFROSTING is poor.

NO DEFROSTING.

1. HEATER emit heat?

Replace HEATER.

2. DRAIN PIPE blocking?

Certify DRAIN PIPE.

DEF-SENSOR is poor. HEATER RELAY is poor. DRAIN PIPE blocking.
3. Remain ice at DEFROSTING?
Certify the attaching of DEF-SENSOR. Certify the attaching state(gap) of FREEZER/ REFRIGERATOR DOOR.
Attaching is poor. DOOR sticking is poor.
Replace TEMPERATURE FUSE. Certify EVA connection and wire of MAIN PWB CONNECTOR (CON1) Replace DEF-SENSOR. Replace RY2 of MAIN PWB. Remove ice and impurities. Certify HEATER PLATE resistance. Reassemble DEF-SENSOR.
Reassemble DOOR. Replace GASKET.

- 29 -

See "DEFROSTING is poor".
7-4 MAIN PWB ASS'Y AND PARTS LIST

7-4-1 MAIN PWB ASS'Y

1. R-B52DZ/R-B55DZ

- 30 -

7-4-2 REPLACEMENT PARTS LIST

- 31 -

7-4-3 PWB ASS'Y, DISPLAY AND PARTS LIST
P/No 6870JB2061A 6600JB8005A 0DL500329AA 0DD414809AA 6500JB1001S 59333105 SWITCH LED
Description PWB(PCB),DISPLAY KPT-1105A
Spec R-B29 (HM-PJT) SV50-R032BF569GG 1N4148 26MM UL1007 AWG24 (VSF 0.18/12/0.3MM2) UL1007 AWG24 (VSF 0.18/12/0.3MM )

Maker DOO SAN KYUNG IN SEOUL SEMI. -

Bigo SW101 L101~L103 -

DIODE, SWITCHING LEAD WIRE LEAD WIRE LEAD WIRE LEAD WIRE LEAD WIRE HOUSING TAP. DOUBLE LOCK PLATE HOUSING CONTACT TAPE, VINYL SENSOR, TEMPERATURE SOLDER, SOLDERING SOLDER, LEAD BAR FLUX
UL1007 AWG24 (VSF 0.18/12/0.3MM2) UL1007 AWG24 (VSF 0.18/12/0.3MM )
UL1007 AWG24 (VSF 0.18/12/0.3MM2) #316092-1 #917764-1 #917704-1 #35022-0006 #35021-1101(PBT) (W19xL60MM=1) K43 PVC R-SENSOR ALMIT KR-19RMA S63S-B20 JS71 KOKI AMP AMP AMP MOLEX MOLEX -
8P 8P (WHITE) (200MM) SOLD -

- 32 -

7-5 PWB DIAGRAM

- 33 -

- 34 -

7. EXPLODED VIEW

w The parts of refrigerator and the shape of each part are subject to change in different localities.

*: optional parts

281A 281B

103B 281E

303A 418A

501F 411A 501A 410G

282J 109A
501K 105A 318A 317A 314A 310A 327A

308A 307A 312A 309A

283B 106B 125L 104A 103C

* 604F*

109B 407A

- 35 -

405C 405A

125A 125H

* 131A*

125A 136A

136B 149B

149C 136C

* 136D*

- 36 -

212A 212C

212A 241B 212C

- 37 -

P/No. 3828JD8462B

SEP., 2003 Printed in Korea