Daewoo KOR-860A0S, KOR-630A0S, KOR-860A0N Service Manual

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Page 1

S/M No. : R630A0S002

Service Manual

Microwave Oven

Model: KOR-630A0S KOR-860A0S KOR-860A0N

DAEWOO ELECTRONICS CO., LTD.

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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.

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.

  

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

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

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

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

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

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

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

CONTRO L PA NEL............ ........... .. .......... .......... .......... ... .......... .......... .......... ........... .. .......... ... .......... 6

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

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

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

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

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

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

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

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

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

WIRING DIA GRAM.............. ... ............ ............ ............ ... ............ ............ ........... ... ............ ................... 24

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

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

PCB CIRCUIT DIAGRAM................................................................................................................. 27

P.C.B. LOCATION NO...................................................................................................................... 28

EXPLODED VIEW AND PARTS LIST................................................................................................ 29

DOOR ASSEMBLY........................................................................................................................... 29

CONTROL PANEL ASSEMBLY ....................................................................................................... 29

TOTAL ASS EMBL Y... .......... .. ........... .......... .......... .. ........... .......... .......... .......... ... .......... .......... . ......... 29

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SAFETY AND PRECAUT IONS

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 attem p t 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 em ission check should be perform ed prior to servicing the oven.

(a) inform the manufacturer, im porter or assembler, (b) repair the unit at no cost to the owner, (c) attem pt 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 com pliance.

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.

IMPORTANT

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

Blue : Neutral Brown : Live

As the colours of the wires in the m anins 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 termianl in the plug which is marked with the letter ‘E’ or by earth symbol or green-and-yellow. The wire which is coloured blue must be connected to the term inal which is marked with the letter ‘N’ or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or coloured red.

NOTE

This oven is designed for counter-top use only.

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SPECIFICATIONS

KOR -630A

MODEL KOR-630A0S POW E R SU PPLY 230V, 50Hz, SIN GLE PHASE WITH EARTHING

MICROWAVE 1200W

POWER CONSUMPTION

MICRO WAVE ENER G Y OU TPUT 800W MICRO WAVE FREQ UEN CY 2450MHz OUTS IDE DIMENSIONS (W X H X D) 465 x 279 x 360 m m (18.3 x 11.0 x 14.2 in.) CAVITY DIMEN SIONS (W X H X D) 290 x 220 x 306 m m (11.4 x 8.7 x 12.0 in.) NET W E IGHT APPRO X. 13 Kg ( 28.7 lbs.) TIMER 59 m in. 90 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLU M E 0.7 Cu.Ft.

GRILL COMBINATION

KOR -860A

MOD EL KOR-860A0S KOR-860A0N POWER S U P P LY 230V, 50Hz(860A0S)/220V,50Hz(860A0N)

SINGLE PHASE W ITH EARTHING

MICROWAVE 1350W 1250W

POWER CONSUMPTION

MICROWAVE ENERGY OUTPUT 900W MICRO WAVE FREQ UEN CY 2450MHz OUTS IDE DIMENSIONS (W X H X D) 495 x 294 x 388 m m (19.5 x 11.6 x 15.3in.) CAVITY DIMEN SIONS (W X H X D) 320 x 244 x 338 m m (12.6 x 9.6 x 13.3 in.) NET WEIG HT APPROX. 15 Kg ( 33.1 lbs.) TIMER 59 min. 90 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLU M E 0.9 Cu.Ft.

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Specifications are subject to change without notice.

GRILL COMBINATION

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EXTERNAL VIEW

1. OUTER DIMENSION

KOR-630A

KOR-860A

465

360

495



294

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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, magnetron tube will immediately stop operating.

11. ROLLER GUIDE

Supports the glass cooking tray.

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EXTERNAL VIEW

3. CONTROL PANEL

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/easy cook -

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 add time to cooking.

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 tim e.

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INSTALLATI ON

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 approximately 6amperes, 230 Volts, 50 Hz / 220Volts, 50Hz(KOR-860A0N).

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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 may result in a fire or other accident

causing oven damage. Using low voltage will cause slow cooking. We are not responsible 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, m ust be repaired with cable of same type.

Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.

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.

7. Do not operate the oven if it is colder than room temperature

(This may occur during delivery in cold weather.) Allow the oven to become 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 a c c e p t th e plu 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 Do 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 mu st 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 STA RT.

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 w hen the oven is plugged in.

9. Time clock returns to the present tim e when 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 S TOP/CLEAR pad once m ore. If the oven door is opened

during the oven operation, all inform ation is retained.

11. If the S TART pad is touched and the oven does not operate, check the area between the door and door is closed

securely. The oven w ill not start cooking under the door is com pletely closed or the program has been reset.

Make sure the oven is properly install

Va ria b le po w e r c o o k ing

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On and OFF cycle time of mechanical V.P.C switch is 30 seconds. When the V.P.C knob is set to the desired position and timer knob turns to the desired position, the V.P.C switch has a cycle (ON/OFF time(sec.)) listed below.

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 tim e s P- 1 0 10 % 11 tim e s P -0 0 0 %

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DISASSEM B LY AND ASSEM BLY

Cautions to be observed wh en 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 m agnetron.

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 - H V Transform er, Magnetron, HV C apacitor, HV D iode, HV Fuse.

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D ISASSE MBLY AND ASSE 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 assembly.

NOTE

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

3. To remove door parts

DOOR ASSEMBLY : 3511710320(KOR-630A) : 3511710720(KOR-860A)

KOR -630A

REF. NO PART CODE PART NAME DESCRIPTION Q’TY REMARK

A01 3512203810 FRAM E D O OR ABS XR -401 H-2938 1 A02 3517003050 BARRIER-SCREEN*O ACRYL 1 A03 3515304610 SUPP ORTE R B ARR -S*O PP 1 A04 3515204100 STOPPER HINGE *T AS KOR-63150S 1 A05 3511705500 DOO R WELD A S KOR-61150S 1 A06 3517002800 BARR IER-SCREE N *I POLYESTER T0.1 1 A07 3512300200 GASKET DOOR PP 1 A08 3513100700 HOOK POM 1 A09 3515101300 SPRING H O OK PW1 1

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D ISASSEMBLY AND ASSEMBLY

KOR -860A

REF. NO PART CO DE PART NAME DESCRIPTION Q’TY REMARK

A01 3512204110 FRAM E DO O R ABS XR -401 H-2938 1 A02 3517003150 BARRIER-SCREEN *O A CRYL T1.5 1 A03 3515304410 SUPPOR TER B ARR -S*O P P 1 A04 3515204100 STOPPER HING E *T AS KOR-63150S 1 A05 3511705620 DOO R W E LD AS KOR-81250S 1 A06 3517002900 BARRIER-SCREEN *I POLYESTER T0.1 1 A07 3512300400 GASKET DOOR PP 1 A08 3513100700 HOOK P OM 1 A09 3515101300 SPRING HO OK PW 1 1

1) Remove the gasket door from door weld AS.

2) Remove the barrier screen inner from door weld AS.

3) Remove the door frame from door weld AS.

4) Remove the stopper hinge top from door weld AS.

5) Remove the spring and the hook.

6) Remove the supporter barrier screen outer from door frame.

7) Remove the barrier screen outer from door frame.

8) Reverse the above steps for reassembly.

4. Method to reduce the gap between the door seal and the oven front surface.

1) To reduce gap located on part ‘A’.

• Loosen a screw on stopper hinge top, and then push the door to contact the door seal to oven front surface.

• Tighten a screw.

2) To reduce gap located on part ‘B’.

• Loosen two screws on stopper hinge under, and then push the door to contact the door seal to oven front surface.

• Tighten two screws.

NOTE

A small gap m ay be acceptable if the microw ave leakage does not exceed 4mW/cm2.

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D ISASSE MBLY AND ASSE MBLY

5. To remove control panel pats.

CONTROL PAN EL ASSEMBLY : PKCPSW ZE 00(KOR -630A) : PKCPSW N E00(KO R-860A)

KOR -630A

REF.NO PART CO DE PART NAME DESCRIPTION Q’TY REMARK

B01 3518521100 SWITCH M E MBR ANE KOR -630A0S 1 B02 3516719410 CONT ROL-PANEL ABS XR-401 H -2938 1 B03 PKMPMSZA00 PCB MAIN AS KOR -631H0S 1 B04 7122401211 SCRE W TAPPING T2S TRS 4x12 MFZN 4 B05 3513702710 LEVER DOOR OPEN ABS XR-401 H -2938 1 B06 441G430171 SPRING BU TTON SW P DIA 0.7 1 B07 3516906910 BUTTON DO OR OP EN ABS XR-401 H-2938 1

KOR -860A

REF.NO PA RT CODE PART NAME DESCR IPTIO N Q’TY REMARK

B01 3518521300 SW ITCH ME M BR ANE B02 3516720210 CONT ROL-PANEL ABS XR-401 H-2938 1 B03 P K M PMSZA00 PCB MAIN AS KOR-631H0S 1 B04 7122401211 SCR EW TAPPING T2S TRS 4x12 MFZN 4

B05 3513702710 LEVER D O OR OP EN ABS XR-401 H -2938 1 B06 441G430171 SPR ING BUTTO N S W P D IA 0.7 1 B07 3516906910 BUTTON DO OR O PEN ABS XR-401 H-2938 1

KOR -860A0S

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D ISASSEMBLY AND ASSEMBLY

1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.

2) Remove the door open lever from the control panel.

3) Remove four screws which secure the PCB assembly to control panel.

4) Disconnect membrane tail from the conector of the PCB assembly.

5) Detach membrane from the control panel.

6) Remove the door open button and button spring from the control panel.

7) Reverse the above steps for reassembly.

6. To remove high voltage capacitor.

1) Remove a screw which secure the grounding ring terminal of the H.V.diode and the capacitor holder.

2) Remove the H.V. diode from the capacitor holder.

3) Reverse the above steps for reassembly.

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High voltage circuit wiring

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D ISASSE MBLY AND ASSE MBLY

7. To remove magnetron.

1) Remove a screw which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

NOTE

Never install the magnetron without the metallic g as ket p la t e wh ic h is p a c k e d with e a c h magnetron to prevent microwave leakage. Whenever repair w ork is carried out on magnetron, check the microwave leakage. It shall not

exceed 4mW /cm

for a fully assembled oven w ith door normally closed.

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8. To remove wind guide assembly.

1) Remove a screw for earthing.

2) Remove the noise filter from the wind guide.

3) Remove a screw which secure the wind guide assembly.

4) Draw forward the wind guide assembly.

5) Pull the fan from the motor shaft.

6) Remove two screws which secure the motor shaded pole.

7) Remove the motor shaded pole.

8) Reverse the above steps for reassembly.

D ISASSEMBLY AND ASSEMBLY

9. To remove H.V.transformer.

1) Remove four screws holding the H.V.transformer.

2) Remove the H.V.transformer.

3) Reverse the above steps for reassembly.

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INTER LOCK MECHANISM AND ADJUSTME NT

The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

1. Primary interlock switch

When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the microswitch. Then the button of the primary interlock switch bring it under “ON” condition.

2. Secondary interlock switc h and interlock mon itor switch

When the door is closed, the hook pushes the lock lever downward. The lock lever presses the button of the interlock monitor switch to bring it under “OFF” condition and presses the button of the secondary interlock switch to bring it under “ON” condition.

ADJUSTMEN T

Interlock monitor sw itch

When the door is closed, the interlock monitor switch should be opened before other switches are closed. When the door is opened, the interlock m onitor switch should be closed after other switches are opened.

3. Adjustment steps

(a) Loosen the one mounting screw. (b) Adjust interlock switch assembly position. (c) Make sure that lock lever moves smoothly after adjustment is completed. (d) Tighten completely one mounting screw.

NOTE

Microwave emission test should be performed after adjusting interlock mechanism .

If the microw ave emission exceed 4mW /cm

, readjust interlock mechanism.

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TROUBLE SHOOTING GUIDE

CONDITION

Continuity

0 infinite

Approx.

(norm al)

Fuse again

Replace

Malfunction

of interlock

Shorted

contacts of

Defective

high voltage

Following the procedure below to check if the oven is defective or not

1. Check grounding before checking trouble.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

4. When checking the continuity of the switches, fuse or high voltage transformer, disconnect one lead wire from these parts and then check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE

W hen electric parts are checked, be sure the power cord is not inserted the wall outlet. “Check wire harness, wiring and connected of the terminals and power cord before check the parts listed below.

(TROUBLE 1)

Fuse blows.

Door shut, timer set, but no cooking tak es place.

CHECK RESULT CAUSE REMEDY

Check continuity of

interloc k monitor switch

with door closed

(COM <-> NC)

Check continuity of both

prim ary and secondary

interloc k sw itch with

door closed

Check continuity of

primary in terlock switch

contact with door

partially open until

interloc k monitor switch

contact close

(COM <-> NC close)

(COM <-> NC)

Continuity

(COM <-> NC)

No Continuity

Continuity

of interlock

monitor

switch

primary

interlock

switch

NOTE 1

Check continuity of

primary winding of low

voltage transformer

Disconnect high voltage

fuse and operate the unit

Ω

150~310

blows

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Defective low

voltage

transformer

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TROUBLE SHOOTING GUIDE

CONDITION

M alfun c tion

Defective

Faulty

contacts of

Adjust or

Replace

Continuity

0 V

CONDITION

Defective

supply cord

Defective

Replace

Adjust

CHECK RESULT CAUSE REMEDY

Outlet has proper voltage Fuse does not

blow.

Check continuity of

magn etron

Check continuity of noise

filter board

Check continuity of

power supply cord

Continuity

Normal

Defective

magn etron

noise filter board

Open pow er

touch control

circu it

NOTE

All these switches must be replaced at the same tim e, please refer to “Interlock Mechanism And A djustm ent”.

(TROUBLE 2)

Display show s all fi gures selec ted, but oven d oes not sta rt co oking, even though desire d

program and ti me are set and start pad is tapped.

Replace

Grill heater is

not heated.

CHECK RESULT CAUSE REMEDY

Check continuity of

primary interlock switc h

Check continuity of

secondary interlock an d

D.O.M . switch

Check D .C. voltage

being supplied to

RELAY (RY2) coil

Continuity

Approx

15 VDC

Malfunction

of primary

inte rlock switch

of secondary interlock and

D.O.M . switch

touch control

circuit

RELAY

(RY2) or open

rela y c oil

Replace

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TROUBLE SHOOTING GUIDE

CONDITIO N

Continuity

0 or

Continuity

0 V

Approx

13 VD C

Defective

high voltage

Defective

high voltage

Defective

magnetron

Defective

magnetron

Defective

high voltage

Defective

high voltage

Defective

touc h c o n tr o l

Faulty

contacts of

(R Y3) or open

Replace

(TROUBLE 3)

No m icrowave

oscillation

No m icrowave oscillation even though fan motor rotates.

CHECK RESULT

Check continuity of high

voltage fuse

Replace high voltage fuse

Check continu ity of high

voltage ca pacitor

term inals with wires

remo v ed

Check continuity of high

volt age rec tifier in

forward and backward

direction with DC

megger

Conn ect meg ger leads to

m agnetron terminal and

m agnetron body

Continuity

Continuity in

backward

direction

CAUSE

tran sfo rmer

rec tifier

REMEDY

Ch ec k resistan ce of

primary and secondary

coil of high volta ge

transforme r

Check continu ity of

m agnetron with wires

removed

Check continu ity of

filament term inal of high

voltage transformer

Check D.C. voltage

being supplie d to

RELAY (RY3) coil



Ω

tran sfo rmer

circuit

RELAY

relay co il

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TROUBLE SHOOTING GUIDE

CONDITION

Replace

control box

sub-assembly

Replace

the bu tton

Malfunction

( TROUBL E 4 )

The follow ing visual conditions indicate a probable defective touch control circuit or m em bra nce switch assem b ly.

1. Incomplete segments,

1) Segments missing.

2) Partical segments missing.

3) Digit fickering other than normal fluorescent slight flickering.

4) “ : 0 ” does not display when power is on.

2. A distinct change in the diplay are not on when they numbers is the display.

3. One or more digits in the diplay are not on when they should be.

4. Display indicates a number different from one touched.

5. Specific numbers (for example 2 or 3) will not display when the panel is touched.

6. Display does not count down or up with time cooking or clock operation.

7. Oven is programmable and cooks normally but no display shows.

8. Display obviously jumps in time while counting down.

9. Display counts down noticeably too fast while cooking.

10. Display does not show the time of day when clear pad is touched.

11. Oven lamp and turntable motor do not stop although cooking is finished. Check if the RELAY 2 contacts close if they are

close, replace touch control circuit.

CHECK RESULT CAUSE REMEDY

Display does

not show program m ing at all, even if

keyboard is

touched.

Check each button for

continuity of the button

keyboard for the

following keyboard

check procedure

Norm al

of touch

control circuit of control box sub-assembly

of botton

keyboard

NOTE

Before following the particular steps listed above in the rtouble shooting guide for the m embrane keyborad’s, failure, please check for the continuity of each wire-harmess between the m em brane keyboard and P.C.B. assembly.



Page 22

ME ASUREME NT AND TEST

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT

Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below.

PROCEDURE

1. Microwave power output measurement is made with the microwave oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1000 ± 5cc of potable water.

2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm.

3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial tem perature of the water is 10 ± 2 °C (50 ± 3.6 °F). It is measured immediately before the water is added to the vessel. After addition of the water to the

vessel, the load is immediately placed on the center of the shelf, which is in the lowest normal position.

4. Microwave power is switched on.

5. Heating time should be exactly A seconds (Refer to table as following).

Heating time is measured while the microwave generator is operating at full power. The filam ent heat-up time for magnetron is not included.

6. The initial and final temperature of water is selected so that the maximum

difference between the ambient and final water temperature is 5K.

7. The microwave power output P in watts is calculated from the following

formula:



P = 4187 x

 

The power measured should be B (Refer to 2. SPECIFICATIONS) W ± 10.0 %.

is difference between initial and ending tem perature.

t is the heating time.

T/ t

CAUTION

1. Water load should be measured exactly to 1 liters.

2. Input power voltage should be exactly specified voltage (Refer to 2. SPECIFICATIONS).

3. Ambient temperature should be 20 ± 2° C (68 ± 3.6°F)

Heating time for power output:



A (second) 70 64 60 56 52 49 47 44 42 40 38

B (W) 600 650 700 750 800 850 900 950 1000 1050 1100



Page 23

MEASUREMENT AND TE ST

2. MICROWAVE RADIATION TEST

WARNING

Make sure to check the microwave leakage before and after repair of adjustment. Always start measuring of an unknown field to assure safety for operating personnel from m icrowave energy. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. Care should be taken not to place the eyes in direct line with the source of microw ave energy. Slowly approach the unit under test until the radiom eter reads an appreciable m icrowave leakage from the unit under the test.

PROCEDURE

1. Prepare Microwave Energy Survey Meter,600cc glass beaker, and glass

thermometer 100°C (212°F ).

2. Pour 275cc ±15cc of tap water initially at 20 ± 5 °C (68 ± 9°F) in the 600cc

glass beaker with an inside diameter of approx. 95 mm(3.5 in.).

3. Place it at the center of the tray and set it in a cavity.

4. Close the door and operate the oven.

5. Measure the leakage by using Microwave Energy Survey Meter with dual

ranges, set to 2450MHz.

Measured radiation leakage must not exceed the value prescribed below.

(1)

Leakage for a fully assembled oven with door normally closed must be

less than 4mW/cm

(2) When measuring the leakage, always use the 5 cm (2 in.) space cone

with probe. Hold the probe perpendicular to the cabinet and door. Place the space cone of the probe on the door, cabinet, door seem, door viewing screen, the exhaust air vents and the suction air vents.

(3) Measuring should be in a counter-clockwise direction at a rate of 1 in./sec.

If the leakage of the cabinet door seem is unknown, move the probe more slow ly.

(4) When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the

base of the cone does not get closer than 2 in. from any metal. If it does not, erroneous reading may result.



Page 24

MEASUR E MENT AND TEST

3. COMPONENT TEST PROCEDURE

High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary nor advisable to attempt measurement of the high voltage. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.

1. High voltage transformer

(1) Remove connections from the transformer terminals and check continuity. (2) Normal readings should be as follows :



± 10%



once the capacitor charged.

Secondary winding ... Approx. 110

Filament winding ... Approx. 0 Primary winding ... Approx. 1

2. High voltage capacitor

(1) Check continuity of capacitor with meter on the highest OHM scale. (2) A normal capacitor will show continuity for a short time, and then indicate 10M (3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 10M (5) Resistance between each terminal and chassis should be infinite.

3. High voltage diode

(1) Isolate the diode from the circuit by disconnecting the leads. (2) With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals. Reverse the

meter leads and again observe the resistance reading. Meter with 6V, 9V or higher voltage batteries should be used to

check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diode's resistance will be infinite in one direction and several hundred K



in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to “Measurement of the Microwave Output Power." Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or a shorted magnetron, (1) Isolate magnetron from the circuit by disconnecting the leads. (2) A continuity check across magnetron filament terminals should indicate 0.1 (3) A continuity check between each filament terminal and magnetron case should read open.



or less.

5. Fuse

If the fuse in the primary and monitor switch circuit is blown when the door is opened, check the primary and monitor switch before replacing the blown fuse. In case the fuse is blown by an improper switch operation, replace the defective switch and fuse at the same time. Replace just the fuse if the switches operate normally.



Page 25

WIRING DIAGR AM



Page 26

PRINTED CIRCUIT BOARD

1. CIRCUIT CHECK PROCEDURE

1) Low voltage transformer check

The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 220~230 V / Frequency: 50Hz

Terminal Voltage LOAD NO LO AD

4 - 7 AC 12.6 V AC 14.7 V

NOTE

1. Refer to C ircuit Diagram (point 4).

2. Secondary side voltage of the low voltage rtansformer changes in proportion to fluctuation of power source voltage.

3. The allowable tolerance of the secondary voltage is within 5% of nominal voltage.

2) Voltage Check

- Key check point

NO CHECK POINT REMARK

1 IC1 PIN 2,21,30,34 -5VDC 2IC1 PIN 35

T : 2 0 m s (5 0 H z )

3 IC1 PIN 31 OR 32

T : 250 ns(4MHz)

- Check method

NO MEASURE POINT W AVE FORM REMEDY REM ARK

1 MP1 DC -5V± 0.25V Replace VL1, EC1, ZD2 N O LO AD 2 MP2 DC -12V± 2.0V Replace EC 2, D12,13,14 NO LOA D

NOTE

Each measure point m ust be m easured with GND points.



Page 27

PRINTED CIRCUIT BOARD

3) When ther e is no mi c r owav e o sc ill a t ion

(1) When touching

START

pad, oven lamp does not turn on.

Fan motor do not rotate, but cook indicator in display comes on.



Cause :

RELAY 2

does not operate.  re fer to Circ uit Dia g r am ( Poi n t 3 )

- Check method

POINT

STA T E

RELAY 2

(2) When touching

ON - 5VDC GND

OFF GN D - 12VDC

START

pad, oven lamp turns on.

A B

Fan motor and turntable rota te and cook indicator in display comes on.



Cause :

RELAY 2

does not operate.  refer to Circuit Diagram ( Point 2 )

- Check method

POINT

STA T E

RELAY 1

O N -5V DC GN D

OFF GND -12VDC

A B

4) When the door is opened during operation, the Count dow n timer does not stop.



refer to Circuit Diagram ( Point 1 )

- Check method

POINT

STA TE

DOOR OPEN OPEN -5VDC

DOOR CLOSED CLOSE G ND

CHECK NO METHOD REMEDY

Ch eck the stage (ON,OFF ) of the seconda ry interlock switch by resistance me asurement.

A B

Replace secondary interlock switch.

5) When the digital clock does not operate properly.



refer to Circuit Dia gram ( Point 5 )

POINT WAVE FORM

A T: 20 ms (50 Hz )



If clock does not keep exact tim e, you must check resistor R15,16, zener diodeZ D1.



Page 28

2. PCB CIRCUIT DIAGRAM

PRINTED CIRCUIT BOARD



Page 29

PRINTED CIRCUIT BOARD

3. P.C.B. LOCATION NO.

NO NAM E SYMBO L SP ECIFICATIO N PART CODE Q'TY

1 B UZZER BZ1 BM-20K 3515600100 1 2 C ARR AY CA1 7P(6) 102 M 50V CN 6XB-102M 1 3 C APACITOR ELEC E C1 16V RSS 100uF CEXF1C101V 1 4 C APACITOR ELEC E C2 25V RSS 1000uF CEXF1E102V 1 5 C ON NE CTOR WAF ER CN1 Y W 396-02AV 3519150520 1 6 C ON NE CTOR WAF ER CN2 Y W 396-05AV 3519150510 1 7 C ON NE CTOR WAF ER CN3 FC Z254-11 441M367160 1 8 D IODE REC TIFY D1~6,9~12 1N4148 DZN4148--- 10

9 D IODE R ECTIFY D13,14 1N4002A DZN4002A-- 2 10 DIODE ZENER ZD1 MTZ 5.1VB 1/2W DZTZ5R1B-- 1 11 D IODE ZENER ZD2 MTZ 3.9VB 1/2W DZTZ3R9B-- 1 12 LED DISPLAY DP1 D DG-631H DDDG631H-- 1 13 PCB MA IN M158 81.5X139.9 3514315410 1 14 R ARRAY RA1 7P(6) 1/8 100K J RA-87X104J 1 15 RESISTOR R1~R7 1/6W 330 5% RD-AZ331J- 7 16 RESISTOR R8,10,12,14,22 1/6W 1K 5% R D -AZ102J- 5 17 RESISTOR R11,20,21 1/6W 100K 5% R D -AZ104J- 3 18 RESISTOR R13 1/6W 100 5% RD -AZ101J- 1 19 RESISTOR R15~17 1/6W 10K 5% RD-AZ103J- 3 20 RESISTOR R18 1/6W 1M 5% RD -AZ105J- 1 21 RESISTOR R19 1/4W 51 5% RD-4Z510J- 1 22 REGULATOR VL1 MC7905C 1MC 7905C-- 1 23 TRANSISTOR Q1~5,9~11 KRA -102M TZRA102M -- 8 24 TRANSISTOR Q6 KTA-1270Y TZTA 1270Y- 1 25 TRANS PO W ER LVT1 D MR -631P 5EP U035302 1 26 IC MICO M IC1 TMP47C440BN-NF94 13GS371GH0 1 27 RESONATOR CERA CR1 KBR-4.0MSTF 5PKBR40MKS 1 28 SW R ELAY RY1 G5G-1A DC12V 5SC0101121 1 29 SW R ELAY RY2 G5B-1 DC12V 5SC0101110 1 30 CAPACITOR CER A C6 102 50V Z AXIAL CCZF1H102Z 1 31 CAPACITOR CER A C1~5,C7 104 50V Z AXIAL CC ZF1H104Z 6



Page 30

EXPLODED VIEW AND PARTS LIST

1. DOOR ASSEMBLY

Refer to Disassembly and assem bly.

2. CONTROL PANEL ASSEMBLY

Refer to Disassembly and assem bly.

3. TOTAL ASSEMBLY



Page 31

EXPLODED VIEW AND PARTS LIST

KOR-630A0S

REF NO. PART CODE PA RT NA ME DESCRIPTION SUPPLY REMARK

A00 DO OR A S Refer to d isas se mbly a n d a s s e m b ly O B00 CONT RO L-PANEL AS Refer to disassem bly and assembly O F01 3510801310 CA BINET PCM T0.6 GE O F02 7112401011 S CREW TAPPING T1 TRS 4X10 MFZN O F03 3516019000 CAVITY WELD AS CAVITY W E LD AS O

3516109600 CAVIT Y JOINT AS CAVITY JO INT AS O F04 7122401211 S CREW TAPPING T2S TRS 4X12 MFZN O F05 7122401211 S CREW TAPPING T2S TRS 4X12 MFZN O F06 7112401011 S CREW TAPPING T1 TRS 4X10 MFZN O F07 35113AEQ0D CORD POW E R AS 3X0.75 70X70 100-R TML O F08 4413A90012 CLAMP POWER CORD NYLON66 O F09 7112401011 S CREW TAPPING T1 TRS 4X10 MFZN O F10 7122401211 S CREW TAPPING T2S TRS 4X30 MFZN O

F11 4415D67620 FUSE 250V 12A 65TS O

4415D67120 FUSE 250V 12A MDA O F12 3518606200 FILTER NOISE DWLF-M12 O F13 7121403011 S CREW TAPPING T2S PAN 4X30 MFZN O F14 3512517000 GU IDE WIND PP O F15 3963513100 M O TOR SH ADE PO LE 230V 17W OEM -10DWC2-A07 O

3963512310 MOTOR SHADE PO LE 230V 20W MW 10C A-M02 O F16 3511800300 FAN PP+30%GLASS O F17 3518002200 M AGN ETRO N 2M218H(MF) I O F18 3516004000 S PECIAL SCRE W T2 BOLT FLANG E 5X12 DACR O O F19 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O F20 3513003200 HO LDER H V CA PACITOR SEC C T0.6 O F21 3518302200 CAPACITOR HV F22 3518400400 DIODE H V HVR-1X-3AB 12KV #187 O F23 3518701100 FUSE HV 5KV 0.55A HV-41A55-02 O F24 3518113700 TR ANS HV DY-N80S0-63T O F25 3516003700 S PECIAL SCRE W TT3 FLG HEX 4X8 MFZN O F26 3510311700 BASE SBHG T0.8 O F27 7112401011 S CREW TAPPING T1 TRS 4X10 MFZN O F28 3512100900 FO OT PP DASF-130 O F29 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O F30 3515201101 STOPPER H INGE *U SCP-1 T2.5 O F31 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O F32 4415A66910 S W M ICRO VP-531A-O F/SZM-V16-FA-61 O F33 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O F34 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G O F35 3513702600 LEV ER LOCK POM O F36 3513811700 LOCK POM O F37 3513601600 LAM P BL 240V 25W T25 C7A H187 O F38 7121400611 S CREW TAPPING T2S PAN 4X6 MFZN O F39 3966310100 MOTOR S YNCRO 220V 2.5W GM -16-24FD12 O

3966310110 M O TOR S YNCRO 220V 2.5W M2LJ49ZT52 O F40 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB O F41 3513003400 HO LDER T HERM OS TAT P BT O F42 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN O F43 3511406200 CO VE R WAVE GUIDE HEATPROOF PP O F44 3517400620 CO UP LER X AREC O F45 3514700710 RO LLER TEFRON O F46 3512517300 GU IDE ROLLER PP 5113MF6 A353B O F47 3517203600 TRAY GLASS O

2100VAC 0.98µF #187



Page 32

EXPLODED VIEW AND PARTS LIST

KOR-860A0S / KOR -860A0N

REF NO. PART CODE PART NAME DESCRIPTION SUPPLY REMARK

A00 DOO R AS Refer to d isassembly and assem bly O B00 CON TRO L -PANEL AS R efer to disassembly and assembly O F01 3510801400 CABINET PCM T0.6 O F02 7112401011 SCR EW TAPPING T1 TRS 4X10 MFZN O F03 3516109200 CAVITY WELD AS CAVITY W ELD AS O

3516109700 CAVITY JOINT AS CAVITY JOINT AS O F04 7122401211 SCR EW TAPPING T2S TRS 4X12 MFZN O F05 7122401211 SCR EW TAPPING T2S TRS 4X12 MFZN O F06 7112401011 SCR EW TAPPING T1 TRS 4X10 MFZN O F07 35113 AEQ0D COR D PO W ER AS 3X0.75 70X70 100-RTM L O F08 4413A90012 C LAMP POW ER CO RD NYLON66 O F09 7112401011 SCR EW TAPPING T1 TRS 4X10 MFZN O F10 7122401211 SCR EW TAPPING T2S TRS 4X30 MFZN O

F11 4415D67620 FUS E 250V 12A 65TS O

4415D67120 FUSE 250V 12A MDA O F12 3518606200 FILTER NO ISE DWLF-M12 O F13 7121403011 SCR EW TAPPING T2S PA N 4X30 MFZN O F14 3512517000 GUIDE W IND PP O F15 3963513100 MOTOR SHA DE PO LE 230V 17W OEM -10DWC2-A07 O

3518115000 TRANS HV DW -N90N0-86T(KOR-860A0N) O F25 3516003700 SPEC IAL SCREW TT3 FLG HEX 4X8 MFZN O F26 3510311900 BAS E SB H G T0.8 O F27 7112401011 SCR EW TAPPING T1 TRS 4X10 MFZN O F28 3512100900 FOOT PP D ASF-130 O F29 7272400811 SCR EW TAPTITE TT3 TRS 4X8 MFZN O F30 3515201101 STOPPE R H INGE *U SCP-1 T2.5 O F31 4415A17352 SW M ICRO VP-533A-OF SPNO #187 200G O F32 4415A66910 SW M ICRO VP-531A-OF/SZM-V16-FA-61 O F33 4415A17352 SW M ICRO VP-533A-OF SPNO #187 200G O F34 4415A17352 SW M ICRO VP-533A-OF SPNO #187 200G O F35 3513702600 LEVER LOC K POM O F36 3513811700 LOCK POM O F37 3513601600 LAMP BL 240V 25W T25 C7A H187 O F38 7121400611 SCR EW TAPPING T2S PA N 4X6 MFZN O F39 3966310100 MOTOR SYN CRO 220V 2.5W G M-16-24FD12 O

3966310110 MOTOR SYN CRO 220V 2.5W M2LJ49ZT52 O F40 3518905300 THERMO STAT OFF:75 ON:65 H #187 NB O F41 3513003400 HOLDE R THER MO STAT PB T O F42 3516003700 SPEC IAL SCREW TT3 FLG HEX 4X8 MFZN O F43 3511406200 CO VER WAVE GUIDE HEATPROOF P P O F44 4418D10032 COUPLER ZAREC O F45 3514700710 ROLLER TEFRON O F46 3512517300 GUIDE RO LLER PP 5113MF6 A353B O F47 3517203500 TRAY GLASS O

2100VAC 0.98µF #187



Page 33

DAEWOO ELECTRONICS CO., LTD

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX : DWELEC K28177-8 CABLE : “DAEWOOELE C ” E-mail : G7F00E@web.dwe.co.kr FAX : 02) 360-8184 TEL: 02) 360-8188~8180

PRINTED DATE : JUN. 1999