Daewoo KOR-131 Service Manual

S/M No. : R131GH0A01

Service Manual

Microwave Oven

Model: KOR-131G0A

KOR-131H0A KOR-130A0A

KOR-131G4A KOR-131H4A KOR-131S4A

✔

Caution

: In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information,please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr).

DAEWOO ELECTRONICS CO., LTD.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave

source, and make repairs as necessary: (1) Interlock operation, (2) Proper door closing, (3) Seal and sealing surfaces (arcing, wear, and other damage), (4) Damage to or loosening of hinges and latches, (5) Evidence of dropping or abuse.

generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and

transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner.

(e) A microwave leakage check to verify compliance with the Federal performance standard should be performed on

each oven prior to release to the owner.

TABLE OF CONTENTS

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

FOR SAFE OPERATION............................................................................................................................... 2

FOR SAFE SERVICE PROCEDURES.......................................................................................................... 2

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

EXTERNAL VIEW...................................................................................................................... 4

OUTER DIMENSION .................................................................................................................................... 4

FEATURE DIAGRAM................................................................................................................................... 5

CONTROL PANEL ........................................................................................................................................ 6

INSTALLATION.......................................................................................................................... 10

OPERATIONS AND FUNCTIONS............................................................................................ 11

DISASSEMBLY AND ASSEMBLY ........................................................................................... 12

INTERLOCK MECHANISM AND ADJUSTMENT............................................................... 20

TROUBLE SHOOTING GUIDE................................................................................................ 21

MEASUREMENT AND TEST.................................................................................................... 25

MEASUREMENT OF THE MICROWAVE POWER OUTPUT.................................................................. 25

MICROWAVE RADIATION TEST .............................................................................................................. 26

COMPONENT TEST PROCEDURE............................................................................................................. 27

WIRING DIAGRAM.................................................................................................................... 28

PRINTED CIRCUIT BOARD..................................................................................................... 29

CIRCUIT CHECK PROCEDURE .................................................................................................................. 29

P.C.B. CIRCUIT DIAGRAM ......................................................................................................................... 32

P.C.B. LOCATION NO .................................................................................................................................. 33

PRINTED CURCUIT BOARD (KOR-131S4)

CIRCUIT CHECK PROCEDURE .................................................................................................................. 35

P.C.B CIRCUIT DIAGRAM ..........................................................................................................................39

P.C.B. LOCATION NO .................................................................................................................................. 40

EXPLODED VIEW AND PARTS LIST .................................................................................... 42

DOOR ASSEMBLY ....................................................................................................................................... 42

CONTROL PANEL ASSEMBLY.................................................................................................................. 42

TOTAL ASSEMBLY...................................................................................................................................... 42

PRECAUTIONS

CAUTION

This Device is to be Serviced Only by Properly Qualified Service Personner. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid

Possible Exposure to Excessive Microwave Energy.

1. FOR SAFE OPERATION

Damage that allows the microwave energy ((that cooks or heats the food) to escape will result in poor cooking and may

cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.)

1) A broken door hinge.

2) A broken door viewing screen.

3) A broken front panel, oven cavity.

4) A loosened door lock.

5) A broken door lock.

The door gasket plate and oven cavity surface should be kept clean.

No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven.

DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed

switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them.

DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. FOR SAFE SERVICE PROCEDURES

1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven.

2) If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven. (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.

3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer and CDRH immediately.

CAUTION

MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM

THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDE FLANGES AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

SPECIFICATIONS

MODEL POWER SUPPLY

MICROWAVE POWER CONSUMPTION

MICROWAVE ENERGY OUTPUT MICROWAVE FREQUENCY OUTSIDE DIMENSIONS (W X H X D) CAVITY DIMENSIONS (W X H X D) NET WEIGHT TIMER FUNCTION SELECTIONS POWER SELECTIONS CAVITY VOLUME

GRILL

COMBINATION

KOR-130A, KOR-131G and KOR-131H KOR-131G4,KOR-131H4 and KOR-131S4 120V-60Hz, SINGLE PHASE WITH GROUNDING 1400W 1500W

1000W 1100W 2450MHz 563 x 318 x 418 mm (22.1 x 12.5 x 16.5in ) 380 x 246 x 386 mm (14.9 x 9.7 x 15.2in) APPROX. 16.5kg (36.4lbs) 99min. 99 sec.(59min. 99sec. KOR-131S4) MICROWAVE 10 LEVELS

1.3 Cu. Ft.

SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

EXTERNAL VIEW

1. OUTER DIMENSION

2. FEATURE DIAGRAM

EXTERNAL VIEW

1. DOOR SEAL

Door seal maintains the microwave within the oven cavity and prevents microwave leakage.

2. DOOR HOOK

When door is closed, it will automatically lock shut. If door is opened while oven is operating, magnetron tube will immediately stop operating.

3. DOOR SCREEN

Allows viewing of food. Microwave cannot pass through perforations in screen.

4. SPATTER SHIELD

Protects the microwave outlet from splashes of cooking foods.

5. OVEN LAMP

Automatically turns on during oven operating.

6. SAFETY INTERLOCK SYSTEM

7. CONTROL PANEL

8. GLASS COOKING TRAY

Made of special heat resistant glass. The tray must always be in proper position before operating. Do not cook food directly on the tray.

9. OVEN FRONT PLATE

10. DOOR OPENING BUTTON

To open the door, push the door opening button. When door is closed, it will automatically lock shut. If door is opened while oven is operating, magentron tube will immediately stop operating.

11. ROLLER GUIDE

Supports the glass cooking tray.

EXTERNAL VIEW

3. CONTROL PANEL

1) KOR-131G / KOR-131G4

1. Time set pad

2. Display

3. One touch

4. Auto cook

5. More

6. Less

7. Auto Defrost

8. Power

9. Defrost

10. Kitchen Timer

11. Clock

12. Stop/Clear

13. Start / Speedy cook

- Used to add time to cooking.

- Used to remove time from cooking.

- Used to set the cooking time and the present time.

- Cooking time, power level, indicators and present time are displayed.

- Used to cook or reheat specific quantities of food.

- Used to cook or reheat.

- Used to defrost foods.(for weight)

- Used to set power level.

- Used to defrost foods.(for time)

- Used as a minute timer, delay cooking, hold setting after cooking.

- Used to set clock.

- Used to stop the oven operation or to delete the cooking data.

- Used to start the oven and also to set a reheat time.

2) KOR-131H / KOR-131H4

EXTERNAL VIEW

1. Time set pad

2. Display

3. One touch

4. More

5. Less

- Used to add time to cooking.

- Used to remove time from cooking.

6. Auto Defrost

7. Power

8. Defrost

9. Kitchen Timer

10. Clock

11. Stop/Clear

12. Start/Speedy cook

- Used to set the cooking time and the present time.

- Cooking time, power level, indicators and present time are displayed.

- Used to cook or reheat specific quantities of food.

- Used to defrost foods.(for weight)

- Used to set power level.

- Used to defrost foods.(for time)

- Used as a minute timer, delay cooking, hold setting after cooking.

- Used to set clock.

- Used to stop the oven operation or to delete the cooking data.

- Used to start the oven and also used to set a reheat time.

EXTERNAL VIEW

3) KOR-130A

1. Time set pad

2. Display

3. One touch

4. Auto cook

5. More

6. Less

- Used to add time to cooking.

- Used to remove time from cooking.

7. Auto Defrost

8. Power

9. Defrost

10. Kitchen Timer

11. Clock

12. Stop/Clear

13. Start/Speedy cook

- Used to set the cooking time and the present time.

- Cooking time, power level, indicators and present time are displayed.

- Used to cook or reheat specific quantities of food.

- Used to cook or reheat.

- Used to defrost foods. (for weight)

- Used to set power level.

- Used to defrost foods. (for time)

- Used as a minute timer, delay cooking, hold setting after cooking.

- Used to set clock.

- Used to stop the oven operation or to delete the cooking data.

- Used to start the oven and also used to set a reheat time.

4) KOR-131S4

EXTERNAL VIEW

1. Time set pad - Used to set the cooking time and the present time.

2. Display - Cooking time, power level, indicators and present time are displayed.

3. Sensor cook - Used to automatically compute the microwave power and cooking time for foods.

4. Auto cook - Used to cook or reheat.

5. Help - Used to help you to operate the oven easily.

6. Time defrost - Used to defrost food. (for time)

7. Auto defrost - Used to defrost foods. (for weight)

8. Minute plus - Used to cook at 100% or to increase the cooking time by simply touching the pad.

9. Clock - Used to set clock.

10. Power level/More less - Used to set power level/Used to increase (or decrease) the cooking time for Sensor & Auto cooking.

11. Kitchen timer - Used as a minute timer, to delay the start of cooking, or to set a holding time after cooking.

12. Stop/Clear - Used to stop the oven operation or to erase all entries.

13. Start/Easy cook - Used to start the oven operation/Used to increase the reheat time by 30 seconds.

INSTALLATION

1. Steady, flat location

This microwave oven should be set on a steady, flat surface.

2. Leave space behind and side

All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure.

3. Away from radio and TV sets

Poor television reception and radio interference may result if the oven is located close to a TV, radio, antenna or feeder and so on.

4. Away from heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be adversely affected and breakdowns occur.

5. Power supply

Check your local power source.

This microwave oven requires a current of approximately 12 amperes, 120 Volts, 60 Hz grounded outlet. Power supply cord is about 0.8 meters long.

1. A short power-supply cord is provided to reduce the risks resulting from becoming entangled in or tripping over a longer cord.

2. Longer cord sets or extension cords are available and may be used if care is exercised in their use.

3. If a long cord or extension cord is used:

1) The marked electrical rating of the cord set or extension cord should be at least as great as the electrical rating of

the appliance.

2) The extension cord must be a grounding type 3-wire cord.

3) The longer cord should be arranged so that it will not drape over the counter top or tabletop where it can be pulled

on by children or tripped over unintentionally.

6. Examine the oven after unpacking for any damage such as:

A misaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.

OPERATIONS AND FUNCTIONS

1. Connect the main lead to an electrical outlet..

2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking.

3. Close the door securely.

4. The oven door can be opened at any time during operation by touching the door release button on the control panel. The oven will automatically shut off. To restart the oven, close the door and then touch START.

5. Each time a pad is touched, a BEEP will sound to acknowledge the touch.

6. The oven automatically cook on full power unless set to a lower power level.

7. The display will show :0 when the oven is plugged in.

8. Time clock returns to the present time when the cooking time ends.

9. When the STOP/CLEAR pad is touched during the oven operation, the oven stops cooking and all information retained.

To erase all information (except the present time), touch the STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.

10. If the START pad is touched and the oven does not operate, check the area between the door and door is closed

securely. The oven will not start cooking under the door is completely closed or the program has been reset.

Make sure the oven is properly installed and plugged into the electrical

Wattage output chart

The power level is set by pressing the POWER pad. The chart shows the display, the power level and the percentage of power.

Touch Power pad. Power level (Display) Approximate Percentage of Power

Once P-HI 100 %

Twice P-90 90 % 3 times P-80 80 % 4 times P-70 70 % 5 times P-60 60 % 6 times P-50 50 % 7 times P-40 40 % 8 times P-30 30 % 9 times P-20 20 %

10 times P-10 10 % 11 times P-00 0 %

DISASSEMBLY AND ASSEMBLY

Cautions to be observed when trouble shooting

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit. You are asked to observe the following precautions carefully.

1. Always remove the power plug from the outlet before servicing.

2. Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side.

3. Discharge the high voltage capacitor before touching any oven components or wiring.

1) Check the grounding. Do not operate on a two-wire extension cord. The microwave oven is designed to be used while grounded. It is imperative, therefore, to makes sure it is grounded properly before beginning repair work.

2) Warning about the electric charge in the high voltage capacitor. For about 30 seconds after the operation has stopped, electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screwdriver to discharge.

4. When the 20A fuse is blown due to the operation of the monitor switch; replace primary interlock switch, secondary interlock switch

and interlock monitor switch.

5. After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened.

6. Do not operate without cabinet.

CAUTION

Service personnel should remove their watches whenever working close to or replacing the magnetron.

WARNING

When servicing the appliance, take care when touching or replacing high potential parts because of electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode.

1. To remove cabinet

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. To remove door assembly

1) Remove two screws which secure the stopper hinge top.

2) Remove the door assembly from top plate of cavity.

3) Reverse the above for reassembly.

DISASSEMBLY AND ASSEMBLY

NOTE

After replacing the door assembly, perform a check of correct alignment with the hinge and cavity front plate.

✔ Caution:

In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr)

DISASSEMBLY AND ASSEMBLY

3. To remove door parts.

REF. NO PART CODE PART NAME DESCRIPTION Q'TY

A01 3512204600 FRAME DOOR ABS XR-401, SR-0320M (KOR-130A) 1

3512204500 FRAME DOOR ABS XR-401, SR-0320M (KOR-131G/H) 1 A02 3517006500 BARRIER-SCREEN *O PEPT T0.25 1 A03 3515202900 STOPPER HINGE *T AS KOR-121M0A 1 A04 3511713600 DOOR PAINTING AS KOR-131G0A 1 A05 3517006400 BARRIER SCREEN *I PE T0.1 1 A06 3512302200 GASKET DOOR PP 1 A07 3513101400 HOOK POM 1 A08 3515101900 SPRING HOOK PW-1 1

1) Remove the gasket door from door plate.

2) Remove the barrier screen inner from door plate.

3) Remove the door frame from door plate.

4) Remove the stopper hinge top from door plate.

5) Remove the spring and the hook.

6) Remove the barrier screen outer from door frame.

7) Reverse the above steps for reassembly.

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