Daewoo KOR-861R0S, KOR-631R0S Service Manual

S/M No. : R631R0S001

Service Manual

Microwave Oven

Model: KOR-631R0S

KOR-861R0S

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) 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.

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

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

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

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

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

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

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

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

INSTALLATION................................................................................................................................... 7

OPERATIONS AND FUNCTIONS....................................................................................................... 8

DISASSEMBLY AND ASSEMBLY...................................................................................................... 9

INTERLOCK MECHANISM AND ADJUSTMENT............................................................................... 16

TROUBLE SHOOTING GUIDE .......... ... ......... ... .................. ... ......... ... ........ ... ... ......... ... ......... ... ........... 17

MEASUREMENT AND TEST...................................................... ......... ................. ......... ......... ........... . 21

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT ...................................................... 21

2. MICROWAVE RADIATION TEST................................................................................................. 22

3. COMPONENT TEST PROCEDURE............................................................................................. 23

WIRING DIAGRAM.............................................................................................................................. 24

PRINTED CIRCUIT BOARD................................................................................................................ 25

1. CIRCUIT CHECK PROCEDURE .................................................................................................. 25

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

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

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

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

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

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

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SAFETY AND PRECAUT IONS

1. FOR SAFE OPERATION

Dam age that allows the microwave energy (that cooks or heats the food) to escape will resu lt in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIO NS EXIST, OPERATOR MUST NOT USE THE APPLIAN CE. (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 im m ediately.

IMPORTA NT

The wire in this mains lead coloured in accordance with the following code. Green-and-yellow : Earth

Blue : Neutral Brown : Live

As the colours of the w ires in the manins lead of this appliance m ay not correspond with the coloured markings identifying the terminals in your plug, proceed as follows. The wire which is coloured green-and-yellow must be connected to the term ianl in the plug which is marked with the letter ‘E’, earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter ‘N ’ or coloured black. The wire which is coloured brown must be connected to the terminal which is m arked with the letter ‘L’ or coloured red.

NOTE

This oven is designed for counter-top use only.

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SPECIFICATIONS

MOD EL KOR-631R KOR-861R POW ER SU PPLY 230V-50Hz, SINGLE PHA SE W ITH EARTHING

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.) CAVITY DIMENSIONS (W X H X D) 290 x 220 x 306 mm (11.4 x 8.7 x 12.0 in.) 320 x 244 x 338mm (12.6 x 9.6 x 13.3 in.) NET W E IGHT APPRO X . 13Kg ( 28.7lbs.) APPRO X. 15Kg ( 33.1lbs.) TIMER 59 min. 00 sec. FUNCTION SELECTIONS MICROWAVE POW E R SELEC TIONS 5 LEVELS CAVITY VOLUM E 0.7 Cu.Ft. 0.9 Cu.Ft.

SPECIFICATIO NS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

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GRILL COMBINATION

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EXTERNAL VIEW

1. OUTER DIMENSION

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2. FEATURE DIAGRAM

EXTERNAL VIEW

1. DOOR SEAL

Door seal surfaces prevent microwaves escaping from the oven cavity.

2. DOOR HOOK

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

3. DOOR SCREEN

Allows viewing of food. The screen is transparent to light, but prevents microwaves escaping.

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. T he tray can be easily removed for cleaning. Make sure it is correctly positioned (indentation) before operating. Place food in a suitable container(dish) on the tray.

9. OVEN FRONT PLATE

10. DOOR OPENING BUTTON

To open the door, push the door opening button.

11. ROLLER GUIDE

Supports the glass cooking tray.

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EXTERNAL VIEW

3. CONTROL PANEL

1. Display -

2. D ef ro s t -

3. Power -

4. Auto cook -

5. Start/Easy cook -

6. Stop/Clear -

7. Clock -

8. Dial Knob -

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

Used to defrost foods by weight or time.

U sed to s e t power l e v el.

Used to cook using a program or to reheat.

Used to stop the oven operation or to erase all entries.

U se d to s et c l o c k.

Used to set the time and weight.

Used to start the oven operation and also increase the reheat tim e by 30 seconds.

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INSTALLATION

1. Steady, flat location

This microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only.

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 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 . Position the oven as far from them as possible.

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

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Check your local power source.

This microwave oven requires a current of approxim ately 6 amperes, 230 Volts, 50 H z.

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Power supply cord is about 0.8 meters long.

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The voltage used must be the same as specified on this oven. Using a higher voltage m ay result in a fire or other accident

causing oven damage. Using low voltage will cau s e s lo w c o ok in g . We ar e n o t re sponsible for damage resulting from use of this oven with a voltage of ampere fuse other than those specified.

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This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type.

Such a cable can be purchased from DA EW O O and must be installed by a Qualified Person.

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

A m isaligned door, broken door or a dent in cavity. If any of the above are visible, DO NOT INSTALL, and notify dealer imm ediately.

7. Do n o t o pe rate th e o v e n if it is c old e r th an roo m temp e r a tu r e

(This may occur during delivery in cold weather.) Allow the oven to becom e room temperature before operating.

EARTHING INSTRUCTIONS

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing wire with a earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician or serviceman if the earthing instructions are not completely understood, or if doubt exists as to whether the appliance is properly earthed, and either : If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a 3-slot receptacle that will ac ce pt t h e p lu g o n th e appliance. The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or D o not use an extension cord.

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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. 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 button.

6. Each time a button 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 when the cooking time ends.

10. When the Stop/Clear button is touched during the oven operation, the oven stops cooking and all information retained.

To erase all information (except the present time), touch the during the oven operation, all information is retained.

11. If the Start button is touched and the oven does not operate, check the area between the door and door seal

for obstructions and make sure the door is closed securely. The oven will not start cooking until the door is completely closed or the program has been reset.

Stop/Clear button

once more. If the oven door is opened

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

Wattage output chart

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

Touch Power button Power level (Display) Approximate Percentage of Power

Once P-HI 100 %

Twice P-80 80 % 3 times P-60 60 % 4 times P-40 40 % 5 times P-20 20 %

DISASSEMBLY AN D ASSEMBLY

Cautions to be observed when trouble shooting

Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. 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 earthed.

Do not operate on a two-wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to makes sure it is earthed 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 12A 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 microw ave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode. H V Fuse.

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D ISASSE MBL Y AN D A SSE MBLY

1. To remove cabinet

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. To remove door assembly

1) Remove a screw which secure the stopper hinge top.

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

3) Reverse the above for reassembly.

NOTE

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

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3. To remove door parts.

D ISASSEM B LY AND ASSEMBLY

(1) KO R-631R 0 S

REF. NO PART CODE PART NAME DESCRIPTION QTY REMARK

A01 3512203800 FRAM E DO O R ABS XR -401 H-2938 1 A02 3517003050 BARRIER-SCREE N*O ACRY L 1 A03 3515304610 SUPPO RTER BAR R-S*O PP 1 A04 3515204100 STOPPER HINGE *T AS KOR-63150S 1 A05 3511705500 DOO R W E LD AS KOR-61150S 1 A06 3517002800 BARR IER-SCREEN *I POLYESTER T0.1 1 A07 3512300200 GASKET DOOR PP 1 A08 3513100700 HOO K POM 1 A09 3515101300 SPRING HO O K PW1 1

(2) KO R-861R 0 S

REF. NO PART CODE PART NAME DESCRIPTION QTY REMARK

A01 3512204100 FRAM E DO O R ABS XR -401 H-2938 1 A02 3517003150 BARRIER-SCREE N*O ACRY L 1 A03 3515304410 SUPPO RTER BAR R-S*O PP 1 A04 3515204100 STOPPER HINGE *T AS KOR-63150S 1 A05 3511705620 DOO R W E LD AS KOR-81250S 1 A06 3517002900 BARR IER-SCREEN *I POLYESTER T0.1 1 A07 3512300400 GASKET DOOR PP 1 A08 3513100700 HOO K POM 1 A09 3515101300 SPRING HO O K PW1 1

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