DAEWOO KOR-631G1A Service Manual

S/M No. : R631G1A001

Service Manual

Microwave Oven

Model: KOR-631G1A

KOR-631H1A KOR-861G1A KOR-861H1A

DAEWOO ELECTRONICS CO., LTD.

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSI VE MICR OWAV E 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) Dam age 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.

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

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

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

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

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

OUTER D IMENS IO N ................. .. ... ...... ... .. ....... .. .. ....... ... .. ....... .. .. ....... .. ... ............. ... .. ....... .. .. ........................... 4

FEAT UR E D IA G RAM ............ ... .. ....... .. .. ....... ... .. ....... .. .. ....... .. ... ....... .. .. .............. .. .. ....... ... .. ....... ........................ 5

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

INSTALLATION................................................................................................................................... 8

OPERATIONS AND FUNCTIONS....................................................................................................... 9

DISASSEMBLY AND ASSEMBLY...................................................................................................... 10

INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 17

TROUBLE SHOOTING GUIDE .......... ... ......... ... .................. ... ......... ... ........ ... ... ......... ... ......... ... ........... 18

MEASUREMENT AND TEST...................................................... ......... ................. ......... ......... ........... . 22

MEASUREMENT OF THE MICROWAVE POWER OUTPUT......................................................................... 22

MICROWAVE RADIATION TEST...................... .. .. ................................................ .......................................... 23

COMPONENT TEST PROCEDURE................................................................................................................ 24

WIRING DIAGRAM.............................................................................................................................. 25

PRINTED CIRCUIT BOARD................................................................................................................ 26

CIRCUIT CHECK PROCEDURE..................................................................................................................... 26

P.C.B. CIRCUIT DIAGRAM .......................................................................... ................................................... 29

P.C.B. LOCATION NO..................................................................................................................................... 30

EXPLODED VIEW AND PARTS LIST................................................................................................. 32

DOOR ASSEMBLY.............. ............ .. .. ............ .. .. ............ .. .. ............ .. .. ............ .. .. ............ .. .. ............................ 32

CONTROL PANEL ASSEMBLY .......................... ............ .. .. ............ .. .. ............ .. .. ............ .. .. ............ .. .............. 32

TOTAL ASSEMBLY.................... .. ............ .. .. ............ .. .. ............ .. .. ............ .. .. ............ .. .. ................................... 32

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SAFETY AND P R E C AUT IONS

CAUTION

This Device is to be Serviced Only by Properly Qualified S ervice Personnel. C onsult the Service Manual for Proper Service Procedures to Assure Continued Safety O peration 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 APPLIAN CE UN TIL 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 m icrowave emission check should be performed prior to servicing the oven. (a) inform the manufacturer, importer or assem b ler, (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 M ICROWAVE ENERGY WH ICH 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 O R ANTENNA W HILE THE DEVICE IS ENERGIZED.

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SPECIFICATIONS

MOD EL KOR-631G/H1A KOR-861G/H1A POW ER SU PPLY 120V-60Hz, SINGLE PH ASE W ITH GRO UN DING

MICROW AVE 1200W 1350W POW ER CONSUMPTION

MICROWAVE ENERGY OUTPUT 800W 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 465 x 279 x 360mm (18.3 x 11.0 x 14.2 in.) 495 x 294 x 388mm (19.5 x 11.6 x 15.3 in.) CAVIT Y DIMENS IONS (W X H X D ) 290 x 211x 306 m m (11.4 x 8.3 x 12.0 in.) 320 x 228 x 338mm (12.6 x 9.0 x 13.3 in.) NET W E IGHT APPRO X . 12Kg ( 26.5lbs.) APPRO X. 14Kg ( 30.9lbs.) TIMER 59 min. 99 sec. FUNCTION SELECTIONS MICROWAVE POW ER SE LECTIONS 10 LEVELS

GRILL

COMBINATION

CAVIT Y VOLUM E 0.7 C u.Ft. 0.9 C u.Ft.

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SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTIC E.

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EXTERNAL VIEW

1. OUTER DIMENSION (KOR-631G/H1A, 861 G/H1A)

465/495

360/388

279/294

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2. FEATURE DIAGRAM

EXTERNAL VIEW

1. DOOR SEAL

Door seal m a intains 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 INTERLO CK 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 w hile oven is operating, magnetron tube will immediately stop operating.

11. ROLLER GUIDE

Supports the glass cooking tray.

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EXTERNAL VIEW

3. CONTROL PANEL

1) KOR-631G1A/861G1A

1. Time set pad -

2. Disp lay

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

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

- Used to add time to cooking.

- Us ed to remov e ti me fr o m coo k i n g.

- Us ed to se t powe r l e ve l.

- Us ed to d efrost foo d s.(for time)

- Used to set clock .

Used to set the cooking time and the present time.

- Used to cook or reheat specific quantities of food.

- Used to cook or reheat.

- Used to defrost foods.(for weight)

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

- 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.

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2) KOR-631H1A/861H1A

EXTERNAL VIEW

1. Time set pad

2. Disp lay

3. One touch

4. More

5. Less

- Used to add time to cooking.

- Us ed to remov e ti me fr o m coo k i n g.

6. Auto Defrost

7. Power

8. Defrost

9. Kitchen Timer

10. Clock

11. Stop/Clear

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

- 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)

- Us ed to se t powe r l e ve l.

- Us ed to d efrost foo d s.(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.

12. Start/Speedy cook

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

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INSTALLATI ON

1. Steady, flat location

This m icrowave 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 fa ilu re.

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 aw ay from hot air, steam or splash w hen choosing a place to position it, or the insulation might be adversely affected and breakdown s occur.

5. Power supply

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Check your local power source. This microw ave oven requires a current of approximately 12 am peres, 120 Volts, 60 Hz grounded outlet.

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Power supply cord is about 1.2 meters long.

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

2. Longer cord sets or extension cords are available and m ay 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.

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OPERATIONS AND FU NCTIONS

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. When the oven door is opened, the light turns off.

5. 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.

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

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

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

9. Time clock returns to the present time w hen the cooking time ends.

10. 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.

11. If the START pad is touched and the oven does not operate, check the area between the door and door seal for

obstructions and m ake sure the 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 outlet.

Wattage output chart

The power le vel is set by pressing the Power pad. The chart show s the display, the power level and the percentage of power.

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

Once P-HI 100 %

Tw ice P-9 0 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 %

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DISASSEMB LY AND ASSEMBLY

Cautions to be observed when trouble shooting

Unlike many other appliances, the microwave oven is high-voltage, high-current equipm ent. It is completely safety 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 with grounding. 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 stopped and 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 15A fuse is blown out 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

W hen servicing the appliance, need a care of touching or replacing high potential parts because of electrical shock or exposing microwave. These parts are as follows - HV Transform er, Magnetron, HV C apacitor, HV D iode.

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