Daewoo KOR-631G9A, KOR-861G0A, KOR-861H0A, KOR-631H0A, KOR-631G0A User Manual

...

S/M No. : R631G0A003

• 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).

Service Manual

Microwave Oven

Model: KOR-631G0A

KOR-631H0A KOR-631G9A

KOR-631H9A KOR-861G0A

KOR-861H0A

Aug. 2003

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWA VE 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 micro-

wave 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.

erating 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 per-

formed on each oven prior to release to the owner.

T ABLE 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...................................................................................................................................................................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

PCB 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

SAFETY AND PRECAUTIONS

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 have excessive emission level 5mw/cm2, the service person should:

(a) inform the manufacturer, importer or assembler,

(b) repair the unit at no cost to the owner,

(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

This device is to be Serviced only by Properly Qualified Service Personel. 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.

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 PASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN SAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

MODEL KOR-631G/H KOR-631G/H9A KOR-861G/H POWER SUPPLY 120V~60Hz, SINGLE PHASE WITH GROUNDING

POWER

MICROWAVE 1200W 1000W 1000W

CONSUMPTION

GRILL

COMBINATION MICROWAVE ENERGY OUTPUT 800W 700W 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 465x279x360 mm (18.3x11.0x14.2 in)

495x294x388 mm (19.5x11.6x15.3 in)

CAVITY DIMENSIONS (W X H X D) 290x211x306 mm (11.4x8.3x12.0 in)

320x228x388 mm (12.6x9.0 x 13.3 in) NET WEIGHT Approx. 13 kg (28.66 Ibs.) Approx. 14 kg (30.9 Ibs.) TIMER 59 min. 99 sec. FUNCTION SELECTIONS MICROWAVE POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0.7 Cu. Ft. 0.9 Cu. Ft.

* SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE.

SPECIFICATIONS

EXTERNAL VIEW

1. OUTER DIMENSION(KOR-631G/H, 631G/H9/KOR-861G/H)

465/495

279/294

360/388

279/294

1. DOOR SEAL

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

2. DOOR HOOK

When the 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. SPATTRSHIELD

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 cooling tray.

2. FEATURE DIAGRAM

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. One touch – Used to cook or reheat specific quantities of food.

4. Auto cook – Used to cook or reheat.

5. More – Used to add time to cooking.

6. Less – Used to remove time from cooking.

7. Auto Defrost – Used to defrost foods. (for weight)

8. Power – Used to set power level.

9. Defrost – Used to defrost foods. (for time)

10. Kitchen Timer – Used as minute timer, delay cooking, hold setting after cooking.

11. Clock – Used to set clock.

12. Stop/Clear – Used to stop the oven operation or to delete the cooking data.

13. Start/Speedy cook – Used to start the oven and also used to set a reheat time.

3. CONTROL PANEL

1) KOR-631G0A/631G9A

2) KOR-861G0A

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. One touch – Used to cook or reheat specific quantities of food.

4. More – Used to add time to cooking.

5. Less – Used to remove time from cooking.

6. Auto Defrost – Used to defrost foods. (for weight)

7. Power – Used to set power level.

8. Defrost – Used to defrost foods. (for time)

9. Kitchen Timer – Used as minute timer, delay cooking, hold setting after cooking.

10. Clock – Used to set clock.

11. Stop/Clear – 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.

3. CONTROL PANEL

1) KOR-631H0A/631H9A/861H0A

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 be overheated 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 12/10(KOR-630A9A) amperes, 120Volts, 60Hz 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. 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 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 pad is touched during the oven operatiion, the oven stops cooking and all information retained.

To erase all information (except the present time), touch the STOP/SLEAR 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 is closed

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

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.

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

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 ASSEMBL Y

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 earthed. It is imperative, therefore, to make 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 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 :When 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 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.

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

3. T o remove door parts.

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

A01 3512203870 FRAME DOOR ABS SG-175, SG-0760B 1 A02 3517006180 BARRIER-SCREEN*0 SAN T1.5 1 A03 3515304610 SUPPORTER BARR-S*0 PP 1 A04 3515204100 STOPPER SINGE *T AS KOR-63150S 1 A05 3511705500 DOOR WELD AS KOR-61150S 1 A06 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 1 A07 3512300200 GASKET DOOR PP 1

A08 3513100740 HOOK POM (LG¨›˙— )1 A09 3515101300 SPRING HOOK PW1 1

1) KOR-631G0A/631H0A/631H9A/631G9A

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

A01 3512204110 FRAME DOOR ABS XR-401, H-2938 1 A02 3517003150 BARRIER-SCREEN*0 ACRYL 1 A03 3515304410 SUPPORTER BARR-S*0 PP 1 A04 3515204100 STOPPER SINGE *T AS KOR-63150S 1 A05 3511705620 DOOR WELD AS KOR-81250S 1 A06 3517002900 BARRIER-SCREEN *I POLYESTER T0.1 1 A07 3512300400 GASKET DOOR PP 1 A08 3513100700 HOOK POM 1 A09 3515101300 SPRING HOOK PW1 1

2) KOR-861G0A/861H0A

✔ 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)

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 screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten two screws.

(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.

(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.

NOTE : A small gap may be acceptable if the microwave leakage does not exceed 4mW/cm2.

5. T o remove control panel parts.

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

B01

3518521000 SWITCH MEMBRANE KOR-631G0A/9A 1 3518521010 SWITCH MEMBRANE KOR-631H0A/9A 1

B02

3516719500 CONTROL PANEL ABS AF-345 HFA-700HT 1 3516719530 CONTROL PANEL VT-0826, AF-348 1

KOR-631G/H9A

B03 3514320660 PCB AS KOR-631H9A 1 B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3 B05 3513702710 LEVER DOOR OPEN ABS XR-401 H-2938 1 B06 441G430171 SPRING BUTTON SWP DIA0.7 1 B07 3516906900 BUTTON DOOR OPEN ABS AF-345 HFA-700HT 1

1) KOR-631G0A/631H0A/631H9A/631G9A

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

B01

3518521500 SWITCH MEMBRANE KOR-861G0A 1

3518521510 SWITCH MEMBRANE KOR-861H0A 1 B02 3516720400 CONTROL PANEL ABS AF-345, HFA-700HT 1 B03 3514320910 PCB MAIN AS KOR-861G0A 1 B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1 B05 3513702710 LEVER DOOR OPEN ABS XR-401 H-2938 1 B06 441G430171 SPRING BUTTON SWP DIA0.7 1 B07 3516906900 BUTTON DOOR OPEN ABS XR-401 H-2938 1

2) KOR-861G0A/861H0A

✔ Caution:

6. T o 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.

◆ High voltage circuit wiring

7. T o 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 gasket plate which is packed with each magnetron to pre-

vent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mW/cm

for a fully assembled oven with door normally closed.

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 connector of the PCB assembly.

5) Detach membrane from the control panel.

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

7) Reverse the above steps for reassembly.

8. T o remove wind guide assembly.

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

2) Draw forward the wind guide assembly.

3) Pull the fan from the motor shaft.

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

5) Remove the motor shaded pole.

6) Reverse the above steps for reassembly.

9. T o 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.

INTERLOCK MECHANISM AND ADJUSTMENT

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 switch and interlock monitor 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.

(3) Adjustment steps

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

ADJUSTMENT :

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

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

NOTE :

Microwave emission test should be performed after adjusting interlock mechanism. If the microwave smission exceed 4mW/cm

, readjust interlock mechanism.

(TROUBLE 1) Oven does not operate at all ; any inputs can not be accepted.

TROUBLE SHOOTING GUIDE

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

1. Check grounding before trouble checking.

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 check continuity with the AC plug removed. To do otherwise may result in a false reading or damage to your meter.

NOTE : When 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.

CONDITION CHECK

Check continuity of interlock monitor switch with door closed

Check continuity of of primary interlock switch contact with door partially open until interlock monitor switch contact close

Malfunction of interlock monitor switch

Shorted contacts of primary interlock switch.

RESULT

Continuity

No Continuity

Replace fuse

CAUSE REMEDY

Replace NOTE 1

Fuse blows.

Replace NOTE 1

Defective low voltage transformer

0Ω or infinite

Approx.

150~310

(normal)

Replace

Check continuity of primary winding of low voltage transformer

Defective high voltage capacitor

Normal

Replace

Disconnect one side of the lead wire connected form high voltage transformer to the high voltage capacitor and operate the unit

Continuity

Defective high voltage transformer

Fuse again

blows

Replace

CONDITION CHECK

Check continuity of magnetron

Defective mag-

netron

RESULT

Continuity

CAUSE REMEDY

Replace

Outlet has

proper volt-

age Fuse

does not

blow.

CONDITION CHECK

Check continuity of primary inter-

lock switch

Malfunction of pri-

mary interlock

switch

RESULT

Continuity

CAUSE REMEDY

Adjust or

replace

Turn table motor and oven lamp

do not turn

Check continuity of secondary

interlock switch

Malfunction of sec-

ondary interlock

switch

Continuity

Adjust or

replace

Check D.C. voltage being sup-

plied to RELAY (RY2) coil

Defective touch

control circuit

0 V Replace

Faulty contacts of

RELAY (RY2) or

open relay coil

Approx. 15 VDC

Replace

Display do not shown

countdown

Malfunction of sec-

ondary interlock

switch

Replace

Check continuity of

power supply cord

Open power sup-

ply cord

Continuity

Replace

Defective touch

control circuit

Normal

Replace

NOTE

All these switches must be replaced at the same time, please refer to “Interlock Mechanism And Adjustment”.

(TROUBLE 2) Display shows all figures selected, but oven does not start cooking, even though desired program and

time are set and start button is tapped.

(TROUBLE 3) No microwave oscillation even though fan motor rotates.

CONDITION CHECK RESULT

Check continuity of high

voltage capacitor terminals

with wires removed

Continuity

CAUSE

Defective high

voltage trans-

former

REMEDY

Replace

microwave

oscillation

Check continuity of high voltage

rectifier in forward and backward

direction with DC megger

Continuity in

backward

direction

Defective high

voltage rectifier

Replace

Connect megger leads to magnetron terminal and magnetron

body

Continuity

Defective mag-

netron

Replace

Check resistance of primary and

secondary coil of high voltage

transformer

0 Ω or ∞

Defective high

voltage trans-

former

Replace

Check continuity of magnetron

with wires removed

Continuity

Defective mag-

netron

Replace

Check continuity of filament termi-

nal of high voltage transformer

Continuity

Defective high

voltage trans-

former

Replace

Check D.C. voltage being sup-

plied to RELAY (RY1) coil

0 V

Defective touch

control circuit

Replace

Approx

15 VDC

Faulty

contacts or

RELAY (RY1)

or open

relay coil

Replace

(TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch

assembly.

1. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) “ :0” does not display when power is on.

2. A distinct change in the display is not on when it should be.

3. One or more digits in the display 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 knob is turned.

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

7. Oven is programable 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 cancel button 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.

NOTE

Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard's, failure, please check for the continuity of each wire-harness between the membrane keyboard and P.C.B. assembly.

CONDITION CHECK

Check rach pad for

continuity of the membrane

keyboard for the following key-

board check procedure

Malfunction

of touch

control circuit

of control box

sub-assembly

RESULT

Normal

CAUSE REMEDY

Replace con-

trol box sub-

assembly

Malfunction

of the membrane

keyboard

Abnormal

Replace the

membrane

keyboard

Display does

not show

programming

at all, even if

keyboard is

touched.

MEASUREMENT 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 temperature 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 filament 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 :

• ▲▲T is difference between initial and ending temperature.

• It is the heating time.

The power measured should be B (

Refer to SPECIFICATIONS

)W±10.0%.

P=4187 X ▲▲T/t

CAUTION :

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

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

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

• Heating time for power output:

600

650

700

750

800

850

900

950

1000401050381100

A(second)

B(W)

2. MICROWA VE RADIATION TEST

PROCEDURES

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. 95mm(3.5in.).

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.

1) Measured radiation leakage must not exceed the value prescribed below. Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm

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

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.

CAUTION :

1. Make sure to check the microwave leakage before and after repair of adjustment.

2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy.

3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known.

4. Care should be taken not to place the eyes in direct line with the source of microwave energy.

5. Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the unit under the 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:

Secondary winding Approx. 110Ω±10% Filament winding Approx. 0Ω Primary winding Approx. 1Ω

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 10MΩ once the capacitor is charged. (3) A shorted capacitor will show continuous continuity. (4) An open capacitor will show constant 10MΩ. (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 A normal diode’s resistance will be infinite in one direction and several hundred KΩ in the other direction.

4. Magnetron

For complete magnetron diagnosis, refer to “Measurement of the Microwave Power Output”. 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 0.1Ω or less. (3) A continuity check between each filament terminal and magnetron case should read open.

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.

WIRING DIAGRAM

1. CIRCUIT CHECK PROCEDURE

1. Low Voltage Transformer check

• The low voltage transformer is located on the P.C.B.

• Measuring condition: input voltage : 120V/Frequency : 60Hz

2. Voltage check

• Key check point

• Check method

PRINTED CIRCUIT BOARD

NO CHECK POINT REMARK

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

3 IC 1 PIN 31 OR 32

NOTE :

Each measure point must be measured with GND points.

NOTE :

1. Refer to Circuit Diagram (point 4).

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

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

Terminal Voltage

4-7

LOAD

AC 12.6 V

NO LOAD AC 14.7 V

NO MEASURE POINT WAVE FORM REMEDY REMARK

1 MP1 DC -5V±0.25V Replace VL1, EC1 NO LOAD 2 MP2 DC -12V±2.0V Replace EC2, D12, 13, 14 NO LOAD

T:16.7ms(60Hz)

T:250ns(4MHz)

Measure Point

3. When there is no microwave oscillation

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. → refer to Circuit Diagram (Point 3)

- Check method

2) When touching START pad, oven lamp turns on. Fan motor and turntable rotate and cook indicator in display comes on. * Cause : RELAY 1 does not operate. → refer to Circuit Diagram (Point 2)

- Check method

4. When the door is opened during operation, the count down timer does not stop.

→ refer to Circuit Diagram (Point 1)

-Check method

5. When the digital clock does not operate properly.

→ refer to Circuit Diagram (Point 5)

* If clock does not keep exact time, you must check resistor R15, 16 zener diode ZD1.

STATE

POINT

RELAY 2 ON -5VDC GND

RELAY 2 OFF GND -12VDC

STATE

POINT

RELAY 1 ON -5VDC GND

RELAY 1 OFF GND -12VDC

STATE

POINT

1) DOOR OPEN OPEN -5VDC

2) DOOR CLOSED CLOSE GND

CHECK NO METHOD REMEDY

1 Check the stage (ON, OFF) of the door open monitor switch by Replace door open monitor

resistance measurement. switch.

POINT WAVE FORM

T:16.7ms(60Hz)

2. PCB CIRCUIT DIAGRAM

1) KOR-631G0A/631H0A/631H9A/631G9A

NO. NAME SYMBOL SPECIFICATION PART CODE Q'TY

1 BUZZER BZ1 BM-20K 3515600100 1 2 C ARRAY CA1 7P(6) 102 M 50V CN6XB-102M 1 3 CAPACITOR ELEC EC1 25V RSS 100uF CEXE1C101V 1 4 CAPACITOR ELEC EC2 25V RSS 1000uF DEZF1E102V 1 5 CONNECTOR WAFER CN1 YW396-02AV 3519150520 1 6 CONNECTOR WAFER CN2 YW396-05AV 3519150510 1 7 CONNECTOR WAFER CN3 FCZ254-11 441M367160 1 8 DIODE RECTIFY D1~6, 9~12 1N4148 DZN4148--- 10

9 DIODE RECTIFY D13, 14 1N4002A DZN4002A-- 2 10 DIODE ZENER ZD1 MTZ 5.1VB 1/2W DZTZ5R1B-- 2 11 DIODE ZENER ZD2 MTZ 3.9VB 1/2W DZTZ3R9B-- 1 12 LED DISPLAY DP1 DDG-631H DDDG631H-- 1 13 PCB MAIN M158 81.5X139.9 3514315410 1 14 R ARRAY RA1 7P(6) 1/8 100K J RD-87X104J 1 15 RESISTOR R1~R7 1/6W 330 5% RD-AZ331J- 7 16 RESISTOR R8,10,12,14,22 1/6W 1K 5% RD-AZ102J- 5 17 RESISTOR R11,20,21 1/6W 100K 5% RD-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 1MC7905C-- 1 23 TRANSISTOR Q1~5, 9~11 KRA-102M TZRA102M-- 8 24 TRANSISTOR Q6 KTA-1270Y TZTA1270Y- 1 25 TRANS POWER LVT1 DMR-631P 5EPU035302 1 26 WIRE COPPER J1-J21 1/0.52 TIN COATING 85801052GY 21 27 WIRE COPPER SJ3 1/0.52 TIN COATING 85801052GY 1 28 IC MICOM IC1 TMP47C440BN 13GS862GH0 1 29 RESONATOR CERA CR1 KBR-4.0MSTF 5PKBR40MKS 1 30 SW RELAY RY1 G5G-1A DC12V 5SC0101121 1 31 SW RELAY RY2 O5B-1 DC12V 5SC0101110 1 32 CAPACITOR CERA C6 102 50V Z AXIAL CCZB1H102K 1 33 CAPACITOR CERA C1~5,C7 104 50V Z AXIAL CCZF1H104Z 6

3. P.C.B. LOCATION NO.

1) KOR-631G0A/631H0A/631H9A/631G9A

✔ Caution:

NO. NAME SYMBOL SPECIFICATION PART CODE Q'TY

1 BUZZER BZ1 BM-20K 3515600100 1 2 C ARRAY CA1 7P(6) 102 M 50V CN6XB-102M 1 3 CAPACITOR ELEC EC1 16V RSS 100uF CEXF1C101V 1 4 CAPACITOR ELEC EC2 25V RSS 1000uF CEXF1C102V 1 5 CONNECTOR WAFER CN1 YW396-02V 3519150520 1 6 CONNECTOR WAFER CN2 YW396-05V 3519150510 1 7 CONNECTOR WAFER CN3 FCZ254-11 441M367160 1 8 DIODE RECTIFY D1~6, 9~12 1N4148 DZN4148--- 10

9 DIODE RECTIFY D13, 14 1N4002A DZN4002A-- 2 10 DIODE ZENER ZD1 MTZ 5.1B 1/2W DZTZ5R1B-- 2 11 DIODE ZENER ZD2 MTZ 3.9B 1/2W DZTZ3R9B-- 1 12 LED DISPLAY DP1 DDG-631H DDDG631H-- 1 13 PCB MAIN 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 R8,9,10,14,22 1/6W 1K 5% RD-AZ102J- 5 17 RESISTOR R11,20,21 1/6W 100K 5% RD-AZ104J- 3 18 RESISTOR R13 1/6W 100K 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-AZ510J- 1 22 REGULATOR VL1 MC7905C 1MC7905C-- 1 23 TRANSISTOR Q1~5, 9~11 KRA-102M TZRA102M-- 8 24 TRANSISTOR Q6 KTA-1270Y TZTA1270Y- 1 25 TRANS POWER LVT1 DMR-631P 5EPU035302 1 26 WIRE COPPER J1-J21 1/0.52 TIN COATING 85801052GY 21 27 WIRE COPPER SJ1,SJ3 1/0.52 TIN COATING 85801052GY 2 28 IC MICOM IC1 TMP47C440BN 13GS862GH0 1 29 RESONATOR CERA CR1 KBR-4.0MSTF 5PKBR40MKS 1 30 SW RELAY RY1 G5G-1A DC12V 5SC0101121 1 31 SW RELAY RY2 G5B-1DC12V 5SC0101110 1 32 CAPACITOR CERA C6 102 50V Z AXIAL CCZB1H102K 1 33 CAPACITOR CERA C1~5,C7 104 50V Z AXIAL CCZF1H104Z 6

2) KOR-861G0A/861H0A

✔ Caution:

1. DOOR ASSEMBLY

Refer to Disassembly and assembly.

2. CONTROL PANEL ASSEMBLY

Refer to Disassembly and assembly.

3. TOTAL ASSEMBLY

EXPLODED VIEW AND PARTS LIST

NO PART CODE PART NAME DESCRIPTION Q'TY

A00

3511710300 DOOR AS KOR-63150S 1 3511714400 DOOR AS KOR-631H9A 1 3516721410 CONTROL-PANEL AS KOR-631G0A 1

B00 3516721420 CONTROL-PANEL AS KOR-631H0A 1

3516721230 CONTROL-PANEL AS KOR-631H9A 1 F01 3510801310 CABINET PCM T0.36 GE 1 F02 3516004100 SPECIAL SCREW T1 TRS LR4 POLE 4*10 MFZN 3

F03

3516109000 CAVITY WELD AS CAVITY WELD AS 1

3516109600 CAVITY JOINT AS CAVITY WELD AS 1 F04 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F05 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F06 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F07 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F08 35113NAN0H CORD POWER AS 3X18AWG 60X60 120-RTML 1 F09 4413A90012 CLAMP POWER CORD NYLON66 1 F10 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F11 7121403011 SCREW TAPPING T2S PAN 4X30 MFZN 2

F12

3963821600 MOTOR SHADED POLE 120V 21W OEM-10DWX1-A07 1

3963821620 MOTOR SHADED POLE 120V 21W MW08XA-A01

KOR-631G/H9A

F13 3512517000 GUIDE WIND PP 1 F14 3511800300 FAN PP+30%GLASS 1 F15 3518002200 MAGNETRON 2M218H(MF) I 1 F16 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1 F17 7272400811 SCREW SPECIAL TT3 TRS 4X8 SE MFZN 1 F18 3513003200 HOLDER HV CAPACITOR SECC T0.6 1

F19

3518301600 CAPACITOR HV 2100VAC 0.79µF #187 1

3518301501 CAPACITOR HV 2100VAC 0.77µF #187

KOR-631G/H9A

F20 3518400400 DIODE HV HVR-1X-3AB 12KV #187 1 F21

3518114400 TRANS HV JMOT-N80A0-63T

KOR-631G/H9A

3518114450 TRANS HV DT-N70A0-63T 1 F22 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F23 3510311700 BASE SBHG T0.8 1 F24 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 5 F25 3512100900 FOOT PP DASF-130 2 F26 7S422X4081 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 F27 3515201101 STOPPER HINGE *U SCP-1 1 F28 - FUSE 120/250V 15A 1 F29 4415A17352 HOLDER FUSE NYLON66 1 F30 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1 F31 4415A66600 SW MICRO VP-532A-OF/SZM-V16-FA-62 1

F32

4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1

3518571000 SW MICRO MP101C

KOR-631G/H9A

F33 3513702600 LEVER LOCK POM 1

1) KOR-631G0A/631H0A/631H9A/631G9A

✔ Caution:

NO PART CODE PART NAME DESCRIPTION Q'TY1

F35 3513811720 LOCK POM (LG¨›˙— )1 F36 3513601500 LAMP BL 125V 25W T25 C5A H187 1 F37 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F38 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 1 F39 3518905300 THERMOSTAT OFF:75 ON:65 H #187 NB 1 F40 3513003400 HOLDER THERMOSTAT PBT 1 F41 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 1 F42 3511406200 COVER WAVE GUIDE HEATPROOF PP 1 F43 3517400620 COUPLER XAREC 1 F44 3514700710 ROLLER TEFLON 3 F45 3512517300 GUIDE ROLLER PP 1 F46 3517203600 TRAY GLASS 1

✔ Caution:

NO PART CODE PART NAME DESCRIPTION Q'TY

A00 3511710700 DOOR AS KOR-86150S 1 B00

3516721110 CONTROL-PANEL AS KOR-861G0A 1

3516721120 CONTROL-PANEL AS KOR-861H0A 1 F01 3510801400 CABINET PCM T0.6 1 F02 3516004100 SPECIAL SCREW T1 TRS 4*10 SE MFZN 3

F03

3516109200 CAVITY WELD AS CAVITY WELD AS 1

3516109700 CAVITY JOINT AS CAVITY WELD AS 1 F04 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F05 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F06 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F07 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F08 35113TANT5 CORD POWER AS 3X0.75 40X40 120-RTML 1 F09 4413A90012 CLAMP POWER CORD NYLON66 1 F10 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F11 7121403011 SCREW TAPPING T2S TRS 4X30 MFZN 2 F12 3518601600 MOTOR SHADED POLE 120V 21W OEM-10DWX1-A07 1 F13 3512517000 GUIDE WIND PP 1 F14 3511800300 FAN PP+30% GLASS 1 F15 3518002200 MAGNETRON 2M218H(MF) I 1 F16 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1 F17 7S422X4081 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 1 F18 3513003200 HOLDER HV CAPACITOR SECC T0.6 1 F19 3518301800 CAPACITOR HV

2100VAC 0.77µF #187

1 F20 3516004000 DIODE HV HVR-1X-3AB 12KV #187 1 F21 3518114700 TRANS HV JMOT-N90A0-86T 1 F22 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F23 3510311900 BASE SBHG T0.8 1 F24 7112401011 SCREW TAPPING T2 TRS 4*10 MFZN 5 F25 3512100900 FOOT PP DASF-130 2 F26 7S422X4081 SCREW SPECIAL TT3 TRS 4X48 SM MFZN 1 F27 3515201101 STOPPER HINGE *U SCP-1 T2.5 1 F28 - FUSE 120/250V 15 A 1 F29 4415A17352 HOLDER FUSE NYLON66 1 F30 4415A66600 SW MICRO VP-532A-OF SPNO #187 200KG 1 F31 4415A66600 SW MICRO VP-533A-OF/SZM-V16-FA-62 1 F32 4415A17352 SW MICRO VP-533A-OF SPNO #187 200G 1 F33 3513702600 LEVER LOCK POM 1

1) KOR-861G0A/861H0A

✔ Caution:

NO PART CODE PART NAME DESCRIPTION Q'TY

F35 3513811700 LOCK POM 1 F36 3513601500 LAMP BL 125V 25W T25 C5A H187 1 F37 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F38 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 1 F39 3518905300 THERMOSTAT OFF:75 ON:65 H#187 NB 1 F40 3513003400 HOLDER THERMOSTAT PBT 1 F41 3516003700 SPECIAL SCREW TT3 TRS 4X8 MFZN 1 F42 3511406200 COVER WAVE GUIDE HEATPRO OF PP 1 F43 3517400620 COUPLER XAREC 1 F44 3514700900 ROLLER TEFLON 3 F45 3512509200 GUIDE ROLLER PP 1 F46 3517203500 TRAY GLASS 1

✔ Caution:

DAEWOO ELECTRONICS CO., L TD.

686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC”

S/M NO. : R631G0A003

PRINTED DATE: Aug. 2001

Daewoo KOR-631G9A, KOR-861G0A, KOR-861H0A, KOR-631H0A, KOR-631G0A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual