REFRIGERATOR SERVICE MANUAL

REFRIGERATOR SERVICE MANUAL

REFRIGERATOR

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE "SAFETY

PRECAUTIONS" IN THIS MANUAL.

MODEL : GR-M652Y*A/M712Y*A

GR-M652Y*Y/M712Y*Y

GR-B652Y*B/B712Y*B

GR-B652Y*Y/B712Y*Y

GR-B652Y*C/B712Y*C

GR-M652Y*X/M712Y*X

GR-M652Y*Q/M712Y*Q

GR-B652Y*S/B712Y*S

GR-B652Y*Q/B712Y*Q

- 1 -

CONTENTS

CONTENTS ............................................................................................................................................................................. 2

SERVICING PRECAUTIONS .................................................................................................................................................. 3

SPECIFICATIONS ............................................................................................................................................................... 4-5

PARTS IDENTIFICATION .................................................................................................................................................. 6-15

FEATURE CHART ........................................................................................................................................................... 6-15

WATER DISPENSER..................................................................................................................................................... 16-17

HOME BAR ....................................................................................................................................................................... 18

DISASSEMBLY ................................................................................................................................................................ 19-20

DOOR ................................................................................................................................................................................. 19

DOOR SWITCH .................................................................................................................................................................. 19

FAN AND FAN MOTOR ..................................................................................................................................................... 19

DEF' CONTROL ASM ........................................................................................................................................................ 20

LAMP ................................................................................................................................................................................. 20

CONTROL BOX-R ............................................................................................................................................................. 20

ADJUSTMENT ................................................................................................................................................................. 21-22

COMPRESSOR ................................................................................................................................................................. 21

PTC-STARTER .................................................................................................................................................................. 21

OLP (OVER LOAD PROTECTOR) .................................................................................................................................... 22

CIRCUIT DIAGRAM .............................................................................................................................................................. 23

TROUBLESHOOTING ..................................................................................................................................................... 24-29

COMPRESSOR AND ELECTRIC COMPONENTS ........................................................................................................... 24

PTC AND OLP ................................................................................................................................................................... 25

ANOTHER ELECTRIC COMPONENT .............................................................................................................................. 26

SERVICE DIAGNOSIS CHART ......................................................................................................................................... 27

REFRIGERATING CYCLE ........................................................................................................................................... 28-29

DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM ................................................................................................ 30-53

EXPLODED VIEW & REPLACEMENT PARTS LIST....................................................................................................... 54-65

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 vaporator.

10.Leave a breakage of refrigerating cycle to a heavy service center. The gas in cycle inside may soil ambient air.

- 2 -

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 is over, add the quantity in grams of R-134a 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

FEMALE

HANSEN

MALE HANSEN

SERVICE TUBE EXTENSION

Figure 1

SOLDERING POINT

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)

TO THE REFRIGERATION

SYSTEM

Figure 4

Before performing this operation (if the vacuum pump and refilling cylinder are connected), make sure that the valve placed between the vacuum pump and 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 REFRIGERATION

SYSTEM

TO THE CHARGE

CYLINDER

VALVE TO BE CLOSED

AFTER VACUUM

TO THE

VACUUM PUMP

TO THE VACUUM PUMP

Figure 5

PRESSURE

GAUGE

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 60 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 vacuum operation

- 3 -

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 R-134a 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 0.10 to 0.4

atmosphere.

1. SPECIFICATIONS

ITEMS

NET CAPACITY

( )

DIMENSIONS (mm)

TOTAL

NET WEIGHT (kg)

TEMPERATURE

CONTROL

FREEZER

REFRIGERATOR

FREEZER

REFRIGERATOR

DEFROSTING SYSTEM

OUT CASE

INNER CASE

INSULATION

SHELF

VEGETABLE TRAY

EGG TRAY

ICE TRAY

FREEZER

REFRIGERATOR

ICE BANK

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

DEFROSTING DEVICE

SPECIFICATIONS

GR-M712Y*A/ M712Y*X/ M712Y*Y,

GR-B712Y*Y/ B712Y*Q/ B712Y*C

GR-B712Y*B/ B712Y*S

157 157

409 393

566

860(W) X 750.5(D) X 1794(H)

97

550

860(W) X 750.5(D) X 1794(H)

96

Knob Dial

Micom Control

Full Automatic

Heater Defrost

Pre Coated Metal

A B S

Cyclo-Pentane Foam

1 EA

2 EA/ 3EA(Option)

Drawer Type

1 Piece

2 Piece

1 Piece

P.T.C Starting Type

Fin Tube Type

Wire Condenser / Screw Condenser

R134a (140g) / R600a (69g)

Heater

- 4 -

ITEMS

NET CAPACITY

( )

DIMENSIONS (mm)

TOTAL

NET WEIGHT (kg)

TEMPERATURE

CONTROL

FREEZER

REFRIGERATOR

FREEZER

REFRIGERATOR

DEFROSTING SYSTEM

OUT CASE

INNER CASE

INSULATION

SHELF

VEGETABLE TRAY

EGG TRAY

ICE TRAY

FREEZER

REFRIGERATOR

ICE BANK

COMPRESSOR

EVAPORATOR

CONDENSER

REFRIGERANT

DEFROSTING DEVICE

SPECIFICATIONS

GR-M652Y*A/ M652Y*X/ M652Y*Y,

GR-B652Y*C/ B652Y*Y/ B652Y*Q

GR-B652Y*B/ B652Y*S

151 151

394 378

545

860(W) X 730.5(D) X 1794(H)

95

529

860(W) X 730.5(D) X 1794(H)

94

Knob Dial

Micom Control

Full Automatic

Heater Defrost

Pre Coated Metal

A B S

Cyclo-Pentane Foam

1 EA

2 EA/ 3EA(Option)

Drawer Type

1 Piece

2 Pieces

1 Piece

P.T.C Starting Type

Fin Tube Type

Wire Condenser / Screw Condenser

R134a (140g) / R600a (69g)

Heater

- 5 -

2. PARTS IDENTIFICATION

2-1. FEATURE CHART

GR-M652Y*A/M712Y*A, GR-M652Y*X/M712Y*X

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vita Light

In-Door Ice

Maker

Freezer Door Rack

Egg Storage Rack

Dairy Corner

Refrigerator Door

Rack

Levelling Screw

Vegetable Partitioner

(Optional)

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 6 -

GR-M652Y*Y/M712Y*Y

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

In-Door Ice

Maker

Freezer Door Rack

Egg Storage Rack

Dairy Corner

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 7 -

GR-B652Y*Y/B712Y*Y

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

In-Door Ice

Maker

Freezer Door Rack

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 8 -

GR-M652Y*Q/M712Y*Q

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

Twigting Ice Serve

Freezer Door Rack

Egg Storage Rack

Dairy Corner

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 9 -

GR-B652Y*Q/B712Y*Q

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

Twigting Ice Serve

Freezer Door Rack

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 10 -

GR-B652Y*B/B712Y*B

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vita Light

In-Door Ice

Maker

Freezer Door Rack

Water Tank

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 11 -

GR-B652Y*S/B712Y*S

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

In-Door Ice

Maker

Freezer Door Rack

Water Tank

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 12 -

GR-B652Y*P/B712Y*P

FREEZER

COMPARTMENT

Lamp

Shelf

Freezer Temperature

Control Dial

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

Twigting Ice Serve

Freezer Door Rack

Water Tank

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 13 -

GR-B652Y*C/B712Y*C

FREEZER

COMPARTMENT

Lamp

Twigting Ice Serve

Shelf

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

Freezer Temperature

Control Dial

Freezer Door Rack

Egg Storage Rack

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 14 -

GR-M652Y*C/M712Y*C

FREEZER

COMPARTMENT

Lamp

Twigting Ice Serve

Shelf

REFRIGERATOR

COMPARTMENT

Deodorizer

(Optional)

Shelves

(Optional)

Lamp

Convertible Room

Vegetable Drawer

Vitamin Kit(optional)

Freezer Temperature

Control Dial

Freezer Door Rack

Egg Storage Rack

Dairy Corner

Refrigerator Door

Rack

Levelling Screw

Base Cover

NOTE : This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above.

- 15 -

2-2 WATER DISPENSER

Features

DISPENSER

PAD

GRILLE

WATER

TANK

REFRIG

ERATOR

DOOR

RACK

Cover Cap

Putting The Water In The Water Tank

1. Open the cover cap and pour water into the water tank.

Cover Cap

2. Close the cover cap.

Tank

Cover

3. Make sure that the valve under the water tank is in position. Push the connecting part into the hole.

VALVE

WATER TANK

VALVE

CAUTION

1. Do not use anything other than water including soft drinks, milk and juices.

2. Hot water needs to be cooled before being put in the water tank.

Drinking

1. Press the dispenser pad with the glass.

2. The water is released when the dispenser pad is pressed. The pad returns to its original position when the glass is removed, and the water stops its flow.

- 16 -

Cleaning

Grille and Drip Tray

1. Remove with the grille.

2. Wash the grille with a mild detergent and rinse thoroughly.

Water Tank

1. Remove the Cover.

2. Clean the inside and outside of the water tank with dishwashing detergent and rinse thoroughly under running water.

3. Clean the tank cover with dishwashing detergent and rinse thoronghly under running water.

CAUTION

1. Use lukewarm water when cleaning.

2. Do not use anything other than water. If it is used with soft drinks, put water in the water tank and discharge three or four cups of water shortly.

- 17 -

2-3 HOME BAR

How to disassemble and assemble the ice access door (H/BAR Door)

1) Open the ice access door to carefully remove left rubber packing.

2) While pressing the hinge separated using a pointed tool (driver, drill), move it to the right and carefully separate the ice access door.

3) The assembly is made in reverse order.

1) 2) 3)

2-4 HOW TO DISASSEMBLE AND ASSEMBLE HANDLE

1. Disassemble the handle, deco and handle, base

1) Remove handle, deco by pulling it out with tooling.

2. Assemble the new handle, deco and handle, base

1) Assemble new handle, base by tightening 3 screws.

Freezer handle Refrigerator handle

2) Remove handle, base by loosening 3 screws.

Upper (1 screw) Lower (2 screws)

2) Assemble handle, deco by pushing it after inserting upper and lower part first.

Upper (1 screw) Lower (2 screws)

- 18 -

3. DISASSEMBLY

3-1 DOOR

Freezer Door

1. Remove the hinge cover by loosening 1 screw and pulling it upwards.

2. Loosen hexagonal bolts fixing the upper hinge to the body and lift the freezer door.

3-2 DOOR SWITCH

1. To remove the door switch, pull out it with a ' ' type driver as shown in (figure 9).

2. Disconnect the lead wire from the switch.

HINGE COVER

BOLT

HINGE

Figure 6

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

Ass'y.

Figure 9

3-3 FAN AND FAN MOTOR

1. Remove the freezer shelf.

2. Remove the Cover Lamp-F by loosening 1 screw fixed to ceiling of Inner Liner.

Figure 7

Refrigerator Door

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

Figure 11

3. Remove the Grille by pulling it out.

4. Pull out the Shroud and remove the Fan Motor Assy by loosening 2 screws.

5. Pull out the fan and, separate the Fan Motor, Brackets and the Guide Fan.

SHROUD

Grille fan Cover

FAN MOTOR

LOWER HINGE

BOLT

GUIDE FAN

COVER

GRILL FAN

GRILLE

FAN

Figure 12

Figure 8

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

Ass'y.

- 19 -

3-4 DEF' CONTROL ASSY

Def control ASM consists of Defrost Sensor and FUSE-M.

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 77°C, 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)

3-5-1 Freezer room lamp

1. Unplug the power cord from the outlet.

2. Remove the room lamp lid by loosening 1screw and take down while pulling it forward with both hands as shown in figure.

3. Remove the lamp by turning it counterclockwise.

3-5-2 Refrigerator room lamp

1. Unplug the power cord from the outlet.

2. Remove refrigerator shelves.

3. Remove the room lamp lid by pulling it forward.

4. Make sure the bulbs are cool to the touch. Remove the lamp by turning it counterclockwise.

3-6 CONTROL BOX-R

SHROUD-F

DEF CONTROL ASM

MULTI FLOW

DUCT

Figure 13 Figure 14

3-5 LAMP

FREEZER ROOM LAMP REFRIGERATOR ROOM LAMP

Figure 18

1. First, remove all shelves in the refrigerator.

2. Loosen 1 screws fixing the Control Box-R to

The Inner Case.

3. Remove the Control Box-R by pulling it downward.

Figure 16 Figure 17

- 20 -

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.

4-2-3 PTC-Applied Circuit Diagram

According to Starting Method of Motor

OVERLOAD PROTECTOR

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.

PTC STARTER

RSIR

COMPRESSOR

MOTOR

HERMETIC

TERMINAL

Figure 20

4-1-3 Note to Use

(1) Be careful not to allow over-voltage and over-current.

(2) No Strike

If applying forcible power or strike (dropping or careless dealing), poor operation and noise may occur.

(3) Use proper electric components appropriate to the

Compressor.

(4) Note to Keep Compressor.

If Compressor gets wet in the rain and rust in the pin of

Hermetic Terminal, poor operation and poor contact may cause.

(5) Be careful that dust, humidity, and flux due to welding don't inflow in Compressor inside in replacing

Compressor. Dust, humidity, and flux due to welding which inflows to Cylinder may cause lock and noise.

4-2 PTC-STARTER

4-2-1 Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is no-contact semiconductor starting device which uses ceramic material and the material consists of BaTiO

3

.

(2) The higher the temperature is, the higher resistance value becomes . These features are used as starting device of Motor.

4-2-4 Motor Restarting and PTC Cooling

(1) For restarting after power off during normal Compressor

Motor operation, plug the power cord after 5 min. for pressure balance of Refrigerating Cycle and PTC cooling.

(2) During normal operation of Compressor Motor, PTC elements generate heat continuously. Therefore, if PTC isn't cooled for a while after power off, Motor can't operate again.

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

(1) If power off during operation of Compressor and power on before PTC is cooled, (instant shut-off within 2 min.

or reconnect a power plug due to misconnecting), PTC isn't cooled and a resistance value grows. As a result, current can't flow to the sub-coil and Motor can't operate and OLP operates by flowing over current in only maincoil.

(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.

4-2-2 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.

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.

- 21 -

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)

CONTACTING

POINT

COVER

ADJUST

SCREW

HEATER

BIMETAL

CONTACTING

POINT

HEATER

TERMINALS

BIMETAL

Figure 21

- 22 -

5. CIRCUIT DIAGRAM

GR-M652Y*A/M712Y*A, M652Y*X/M712Y*X, M652Y*Y/M712Y*Y

GR-B652Y*B/B712Y*B,

B652Y*S/B712Y*S,

B652Y*Y/B712Y*Y

GR-B652Y*Q/B712Y*Q

GR-B652Y*C/B712Y*C

NOTE : 1. This is a basic diagram and specifications vary in different localities.

- 23 -

6. TROUBLESHOOTING

6-1 COMPRESSOR AND ELECTRIC COMPONENTS

Power Source.

Remove the PTC-Starter from the Compressor and measure the voltage between Terminal C of

Compressor and

Terminals 5 or 6 of PTC.

(Rating Voltage

10%)?

YES

Check the resistance of

Motor

Compressor.

Check the resistance of

PTC-Starter.

Check OLP.

Check starting state.

No Voltage.

OLP disconnected?

YES

Replace OLP.

Check connection condition.

Reconnect.

Applied voltage isn't in the range of Rating

Voltage 10%.

Advise the customer to use a regular

Trans.

Check the resistance among M-C, S-C and

M-S in Motor

Compressor.

YES

NO

Replace Compressor.

Check the resistance of two terminals in

PTC-Starter.

YES

NO

Replace

PTC-Starter.

Check if applying a regular OLP.

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

PTC.

YES

OLP works within 30 sec. in forcible OLP operation by turning instant power on and off.

NO

YES

Replace OLP.

NO

Components start at voltage 10% of rated voltage.

YES

O.K.

NO

- 24 -

6-2 PTC AND OLP

Normal operation of

Compressor is impossible or poor.

Separate the PTC from

Compressor and measure the resistance between No. 5 and 6

(only RSIR Type) or No.

4 and 5 of PTC with a

Tester or Wheat stone bridge. (Figure 22)

Observation value at

220V/50Hz : 47 30%

220 - 240V/50Hz : 47 30%

110 -115V/60Hz : 6.8

30%

220V/60Hz : 47 30%

127V/60Hz : 22 30%

The resistance value is 0 or several hundreds or infinity.

Check another electric components.

Replace PTC.

Separate the OLP from

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

(Figure 23)

YES

Check another electric components.

NO

Replace OLP.

Figure 22

Figure 23

- 25 -

6-3 ANOTHER ELECTRIC COMPONENTS

Cooling is impossible

Compressor doesn't run.

Check if current flows to the following components.

a. Thermistor b. Starting devices c. OLP d. Compressor coil e. Circuit Parts

Cause.

Poor contacting.

Shorted or broken.

Poor contacting or shorted.

Coil shorted.

Poor contacting or shorted.

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.

Check capacity of OLP.

The items described above are normal.

Cooling ability is poor

Fan motor doesn't run.

Much frost are sticked to the EVAPORATOR.

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.

Heater plate

Heater cord

- 26 -

Low voltage.

Poor contacting and broken.

Shorted.

Lack of capacity.

Coil of motor

Compressor.

Poor contacting.

Coil is shorted.

Shorted.

Replace each component.

Raise the voltage.

Replace each component.

Replace the compressor.

Replace each component.

Replace each component.

Replace each component.

6-4 SERVICE DIAGNOSIS CHART

set.

COMPLAINT

Cooling is impossible.

Cooling ability is poor.

Foods in the

Refrigerator are frozen.

Dew or ice forms in the chamber of the

Dew forms in the

Out Case.

Abnormal noise generates.

To close the door is not handy.

Ice and foods smell unpleasant.

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 "0~1".

Is the ambient temperature below 5°C?

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 surrounding air are high.

Is the gap in the door packed?

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 back side is taken out.

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?

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 "3".

Set the Display LED to "5~6".

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 Leveling 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.

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.

- 27 -

Replace the

Thermistor.

6-5 REFRIGERATING CYCLE

Troubleshooting Chart

CAUSE

STATE OF THE

SET

STATE OF THE

EVAPORATOR

PARTIAL

LEAKAGE

Freezer and

Refrigerator don’t get cold normally.

Low flowing sound of

Refrigerant is heard and frost forms in inlet only

WHOLE

LEAKAGE

Freezer and

Refrigerator don’t get cold at all.

PARTIAL

CLOG

Freezer room and

Refrigerator don’t get cold normally.

Flowing sound of

Refrigerant is not heard and frost isn't formed.

Flowing sound of

Refrigerant is heard and frost forms in inlet only.

TEMPERATURE

OF THE

COMPRESSOR

A little higher than ambient temperature.

Equal to ambient temperature.

A little higher than 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.

WHOLE

CLOG

MOISTURE

CLOG

COMP-

RESSION

NO COMP-

RESSION

Freezer and

Refrigerator don’t get cold.

Cooling operation stops periodically.

Freezer and

Refrigerator don’t get cold.

No compressing operation.

Flowing sound of Refrigerant is not heard and frost isn’t formed.

Equal to ambient temperature.

Flowing sound of Refrigerant is not heard and frost melts.

Lower than ambient temperature

Low flowing sound of

Refrigerant is heard and frost forms in inlet only.

A little higher than ambient temperature.

Flowing sound of Refrigerant is not heard and no frost.

Equal to ambient temperature.

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.

Leakage Detection

Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.

Whether Compressor runs or not.

YES

Whether frost forms or not in

Evaporator.

No frost or forms in inlet only

Whether oil leaks or not.

Normal formed frost

Normal amount

Moisture Clog.

Faulty

Compressor.

Observe the discharging amount of Refrigerant.

No or much amount

Inject Refrigerant to

Compressor and check cooling operation.

YES

Check Comprossor

Clogged by dust.

Gas leakage.

Normal formed frost in Evaporator

(Check the leakage point)

- 28 -

General Control of Refrigerating Cycle

NO.

1

2

3

4

5

6

7

ITEMS

WELDING

ROD

CONTENTS AND SPECIFICATIONS

(1) H 30

Chemical Ingredients

Ag : 30%, Cu : 27%, Zn : 23%, Cd : 20%

Brazing Temperature : 710~840°C

(2) Bcup-2

Chemical Ingredients

Cu : About 93%

P : 6.8~7.5%

The rest : within 0.2%

Brazing Temperature : 735~840°C

FLUX

DRIER

ASM

Ingredients and how to make

Borax 30%

Borax 35%

Fluoridation kalium : 35%

Water : 4%

Mix the above ingredients and boil until they are transformed into liquid.

(1) Assemble the drier within 30min. after unpacking.

(2) Keep the unpacked drier at the temperature of 80~100°C.

VACUUM

PIPE

(1) When measuring with pirant Vacuum gauge of charging M/C, vacuum degree is within 1

Torr.

(2) If the vacuum degree of the cycle inside is 10

Torr. below for low pressure and 20 Torr. for high pressure, it says no vacuum leakage state.

(3) Vacuum degree of vacuum pump must be

0.05 Torr. below after 5 min.

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

DRY AND

AIR

NITROGEN

GAS

(1) The pressure of dry air must be more than

12~16Kg/cm 2

(2) Temperature must be more than -20~-70°C.

(3) Keep the pressure to 12~6Kg/cm 2 also when substituting dry air for Nitrogen Gas.

NIPPLE AND

COUPLER

(1) Check if gas leaks with soapy water.

(2) Replace Quick Coupler in case of leakage.

Put all Joint Pipe in a clean box and cover tightly with the lid so that dust or humidity is not inserted.

REMARKS

Recommend H34 containing 34% Ag in the

Service Center.

Make amount for only a day.

Holding period : 1 day

Close the cover of container to prevent dust putting in the FLUX.

Keep it in a stainless steel container.

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

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.

Check if gas leaks from connecting part of

Coupler.

- 29 -

7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM

The following description is basically for GR-M652Y*A/M712Y*A, M652Y*X/M712Y*X, M652Y*Y/M712Y*Y, GRB652Y*

B/B712Y*B, B652Y*S/B712Y*S, B652Y*Y/B712Y*Y, GR-B652Y*Q/B712Y*Q

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, Exterior display is set to

3’ ‘2’ ‘1’ ‘0’ ‘6’ ‘5’ ‘4’ in order and Interior display is set to ‘R2’ ‘R3’ ‘R4’ ‘R0’ ‘R1’.

2. When the power is initially applied or restored after a power failure, it is automatically set to ‘3’ against the interruption of electric power.

GR-M652Y*A/M712Y*A

GR-M652Y*X/M712Y*X

GR-M652Y*Y/M712Y*Y

GR-B652Y*B/M712Y*B

GR-B652Y*S/B712Y*S

GR-B652Y*Y/B712Y*Y

GR-B652Y*Q/B712Y*Q

Temp

Control

TEMP(°C)

ROOM

Very

Low

6

GR-B652Y*C/B712Y*C

Low

5

Medium/

Low

4

Medium

3

REFRIGERATOR

Medium/

High

2

High

1

Very

High

0

Temp

Control

TEMP(°C)

ROOM

Low

Medium/

Low

Medium

REFRIGERATOR

Medium/

High

High

- 30 -

7-1-2 SUPER COOL

1. This feature is to shorten the cooling time of the refrigerator by keeping the comp, fan running for a while. When the

Super Cool button is pushed, the Super Cool LED turns on in order and the comp keeps on running. In 2 hours, the

Super Cool mode will be cleared.

2. When the Defrosting mode starts while in the Super Cool mode, defrosting is performed. After that, the Super Cool mode resumes for the remaining time.

3. When the Super Cool button is pushed while in the Defrosting mode, the Super Cool mode starts in 7 minutes after the completion of the defrosting even though the Super Cool LED turns on.

4. If a power failure occurs while in the Super Cool mode, the Super Cool mode will be cancelled when the power is restored.

5. If the Super Cool mode is selected when it has not passed 7 minutes since the comp stopped, the comp will start running after the remaining time elapses.

6. In Super Cool mode, Freezer fan motor operates with High speed RPM.

7-1-3 CONTROL OF VARIABLE SPEED FAN IN THE FREEZER COMPARTMENT

1. Fan motor in the freezer compartment shall change from standard to high speed rpm in order to increase cooling speed and load corresponding speed.

2. Hign speed rpm is only used for the initial power application, super cool mode and load corresponding operation. But standard rpm is used in the general working conditions.

3. When the door of freezer room or refrigerator room is opened, the FAN MOTOR is stoped immediately, then when the door is closed, the FAN MOTOR is operated.

7-1-4 ALARM FOR OPEN DOOR

1. This feature is to alarm by the buzzer when the door of the freezer or the refrigerator is not closed in 1 minute after it is opened.

2. In 1 minute after the door is opened, the buzzer sounds three times at the interval of 0.5 second. After that, every 30 seconds, the buzzer sounds three times with 0.5 sec ON/OFF.

3. The alarming is cancelled when the door of the freezer or the refrigerator is closed while the buzzer sounds.

(EX.)

FREEZER OR

REFRIGERATOR

DOOR

CLOSE OPEN CLOSE

BUZZER

OPEN three times three times three times within

1 minute

1 minute 30 seconds

30 seconds three times

CLOSE

- 31 -

7-1-5 BUZZER SOUND

1. When the button on the front Display is pushed, “Ding-” sound is produced and it works as follows.

7-1-6 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 7-1-10. Error Diagnostic Mode.)

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

7-1-7 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.

Operating Sequence Condition of Operation

If the temp of the defrosting sensor is 45 °C or above

(For the initial use after the purchase or grounding)

POWER

ON

in 0.5 sec

COMP

ON

in 0.5 sec

COOLING FAN

ON

If the temp of the defrosting sensor is below 45 °C

(After a power failure or SVC)

POWER

ON

in 0.5 sec in 0.5 sec

HOME BAR

HEATER ON

DEFROSTING

HEATER ON

in 0.5 sec in 5 sec

HOME BAR

HEATER OFF

DEFROSTING

HEATER OFF

in 0.5 sec

COMP

ON

in 0.5 sec

COLLING FAN

ON

When returned from the Test mode

ALL LOADS

OFF

in 7 min

COMP

ON

in 0.5 sec

COOLING FAN

ON

- 32 -

7-1-8 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. However, the recognition tone (beep~) sounds.

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.

GR-M652Y*A/M712Y*A

GR-M652Y*X/M712Y*X

GR-M652Y*Y/M712Y*Y

GR-B652Y*B/M712Y*B

GR-B652Y*S/B712Y*S

GR-B652Y*Y/B712Y*Y

GR-B652Y*Q/B712Y*Q

NO Error

Error Code

Display

1

2

Faulty refrigerator

(R) sensor

Faulty defrosting sensor r d

3

Faulty Room temperature sensor

(in the main PCB) when super cool and refrigerator key pressed together display will be all off

Cause

Cut or short-circuited wire of refrigerator sensor

Cut or short-circuited wire of defrosting sensor

Cut or short-circuited wire of intake air temperature sensor

4 Defrosting failure H

State of Operation with Error

Comp Cooling fan

Defrosting heater

15 min ON/

15 min OFF

Normal

Condition

Normal

Condition

Cut or disconnected wire of defrosting heater or temperature fuse(indicated at least 4 hours later after the error occurs)

Normal

Condition

Low

RPM

Low

RPM

Low

RPM

Low

RPM

Normal

Condition

No defrosting

Normal

Condition

Normal

Condition

- 33 -

7-1-9 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.

GR-B652Y*C/B712Y*C

NO Error

1

Faulty refrigerator sensor (on the control box of the refrigerator)

Error Code Display

R0 R1 R2 R3 R4

Cause

Cut or short-circuited wire of refrigerator sensor

2

Faulty defrosting sensor

Cut or short-circuited wire of defrosting sensor

3

4

Faulty room temp.

sensor in the main

PCB

Defrosting failure

Comp /

Cooling fan

15 min ON/

15 min OFF

Normal

Condition

Cut or short-circuited wire of defrosting sensor

Normal

Condition

Cut or disconnected wire of defrosting heater or temperature fuse(indicated at least after 2 hrs of error occurrence)

Normal

Condition

: OFF : ON

State of Operation with Error

Defrosting heater

Normal

Condition

No defrosting

Normal

Condition

Normal

Condition

- 34 -

7-1-10 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 5 minutes on test mode 1 and in 2 hours on test mode 2 and then reset.

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

4. After exiting the test mode, be sure 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

TEST 1 Push the test button once.

Manipulation

TEST 2

Reset

Push the test button once while in the TEST

MODE 1.

Push the test button once while in the TEST

MODE 2.

Contents Remark

1. Continuous operation of the comp

2. Continuous operation of the freezer fan

3. Defrosting heater OFF

4. Every display LED ON

5. F-lamp can be switch on/off by door open close

1. Comp OFF

2. Freezer fan OFF

3. Defrosting heater ON

4. Every display LED OFF

(except the refrigerator temp.

status keys displaying ‘2’)

5. H-lamp can be switch on-off by door open/close for 5 sec’s

Reset to the default setting

Reset if the temp of the defrosting sensor is 13°C or above.

The compressor will start in 7 minute-delay.

* LED Check Mode: When the refrigerator temp control button and the Super Cool button are pushed and held together for

1 sec or longer, every LED on the display turns on simultaneously. When the buttons are released, the previous mode is restored.

* FAN RPM VARIETY CHECK : Press super cool button and the refrigerator temp control button are pushed and held together for 1 sec or longer, FAN RPM is reversed for 30 second (HIGH LOW) and return to the previous condition.

<TEST MODE1 STATUS LED> <TEST MODE1 STATUS LED>

<TEST MODE2 STATUS LED> <TEST MODE2 STATUS LED>

- 35 -

7-2 PCB FUNCTION

7-2-1 POWER CIRCUIT

The power circuit consists of the noise attenuation part and the SMPS (Switch Mode Power Supply) part. The SMPS consists of the rectifier (D1, D2, D3, D4 & CE1) to convert AC voltage to DC voltage, switching part (IC2) to switch the converted DC voltage, transformer to transmit energy of the first side of the switching end to the second side, the secondary power to supply power to MICOM and IC, and the feedback part (IC3) to feedback the secondary voltage to the first side of the transformer in order to maintain the secondary voltage constant.

Caution : High voltage (DC 310V) is maintained in this circuit. Wait at least 3 minutes after unplugging to allow the current to dissipate. There is a danger of electric shock.

- 36 -

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.)

- 37 -

7-2-4 LOAD/BUZZER DRIVE & OPEN DOOR DETECTION CIRCUIT

1. Load Drive Condition Check

Load Type

Measurement Location (IC6)

Condition

ON

OFF

COMP

NO.16

Defrosting

Heater

NO.12

Lamp

NO.10

Fan Motor

HIGH RPM

Fan Motor

Low RPM

NO.14

NO.15

1V or below

12V

Home Bar

Heater

NO.13

R-Lamp

NO.11

* When the door of the freezer/refrigerator is left open for 7 minutes or longer, the lamp of the freezer/refrigerator turns off automatically.

- 38 -

2. Buzzer Drive Condition Check

Condition

Measurement Location

IC1 ( )

Tone (Beep~) when the button on the display is pushed

IC1 ( )

3. Open Door Detection Circuit Check

Alarm for open door

(beep-beep-beep)

OFF

0V

0V

Measurement

Freezer/

Refrigerat Door

Location

Closed

Open

(PIN NO. 34)

0V

5V

- 39 -

7-2-5 TEMPERATURE SENSOR CIRCUIT

The following temperature sensor circuit consists of a sensor to detect the outside (ambient) temperature, sensor in refrigerator compartment to detect freezer & refrigerator temp. The status of each sensor, whether open or shorted, is shown below.

SENSOR

Room Temperature Sensor

Refrigeration Sensor

Defrosting Sensor

CHECK POINT

POINT Voltage

POINT Voltage

POINT Voltage

NORMAL(-30 °C ~ 50 °C) SHORT-CIRCUITED OPEN

0.5V ~ 4.5V

0V 5V

- 40 -

7-2-6 SWITCH INPUT CIRCUIT

* The circuit shown below is the input circuit to detect the signals of the test S/W for checking the refrigerator.

7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT

1. The circuits for less cooling and overcooling compensation in a refrigerator compartment

OVER COOLING

COMPENSATION

JCR2 JCR1

CUT

CUT CUT

CUT

CUT

CUT

CUT

CUT

LESS COOLING

COMPENSATION

JCR3 JCR4

CUT

CUT

CUT

CUT

CUT

CUT

CUT

CUT

REFRIGERATOR TEMPERATURE

COMPENSATION VALUES

+1°C

+2°C

-1°C

-2°C

0°C

0°C

+1°C

-1°C

0°C(AT FACTORY)

REMARKS

The above OPTION circuit is to compensate refrigerator temperature by simply cutting during service.

- 41 -

7-2-8 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 (LED Module). The drive type is the scan type.

- 42 -

7-3. RESISTANCE SPECIFICATION OF SENSOR

TEMPERATURE SENSOR

- 20°C

- 15°C

- 10°C

- 5°C

0°C

+ 5°C

+ 10°C

+ 15°C

+ 20°C

+ 25°C

+ 30°C

+ 40°C

+ 50°C

RESISTANCE OF FREEZER

SENSOR

22.3

16.9

13.0

10.1

7.8

6.2

4.9

3.9

3.1

2.5

2.0

1.4

0.8

RESISTANCE OF REFRIGERATOR

(DEFROST) SENSOR

77

60

47.3

38.4

30

24.1

19.5

15.9

13

11

8.9

6.2

4.3

The resistance of SENSOR has 5% common difference.

Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature.

This postponing is necessary because of perceiving speed.

- 43 -

- 44 -

- 45 -

7-5 MAIN PWB ASS'Y AND PARTS LIST

7-5-1 MAIN PWB ASS'Y

* In the case of GR-M652/M712 (203V) model.

P/No of main ASS’Y is used as EBR327903.

- 46 -

7-5-2 REPLACEMENT PARTS LIST

- 47 -

- 48 -

7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST

- 49 -

7-5-4 PWB ASS'Y, DISPLAY(I-MICOM) AND PARTS LIST

- 50 -

7-5-5 V-LED DISPLAY & PART LIST

- 51 -

7-6 PWB DIAGRAM

- 52 -

- 53 -

9. EXPLODED VIEW & REPLACEMENT PARTS LIST

9-1.

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

Capacitors and fuse are optional parts.

501F

281A

103B

411A

103A

501A

501K

410G

281B

301A

401A

129A

408A

409A

158A

406B

282B

304A

314A

307A

318A

105A

317A

312A

303B

303C

303A

310B

420A

329C

310A

319A

323B

319C

315B

315C

103C

604G

283B

104A

106A

315B

315A

106A

407A

120A

409B

158C

GR-B652/712Y**

GR-M652/712Y**

330B

158E

405C

405A

404A

158D

329A

332A

149A

149C

131A

149C

149E

149B

149D

154A

125A

155J

140A

152A

151A

GR-B652/712Y*P

205A

205A

611P

611A

611D

611G

611E

611F

611J

241F

611K

235A

241G

241A

241D

203A

201A

212C

212A

212G

279A

280F

280E

279C

503B

279B

210B

210A

233A

231A

611L

244C

244A

613A

611M

243A

243B

P/No. MFL62196001 NOV., 2006 Printed in Korea

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