DAEWOO KOG-1A0A9A, KOG-1A6A9A Service Manual

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Page 1

S/M NO. :

DAEWOO ELECTRONICS CORP.

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

PRINTED DATE: May. 2005

Page 2

Service Manual

Microwave Oven

Model: KOG-1A0A9A

KOG-1A6A9A

S/M No. :

May. 2005

✔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

Page 3

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

microwave source, and make repairs if 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.

(c)Before turning on power to the microwave oven for any service test or inspection within the microwave

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

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

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

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

performed on each oven prior to release to the owner.

TABLE OF CONTENTS

SAFETY AND PRECAUTIONS........................................................................................................................................3

FOR SAFE OPERATION...........................................................................................................................................3

FOR SAFE SERVICE PROCEDURES .....................................................................................................................3

SPECIFICATIONS ............................................................................................................................................................4

EXTERNAL VIEW.............................................................................................................................................................5

OUTER DIMENSION.................................................................................................................................................5

FEATURE DIAGRAM.................................................................................................................................................6

CONTROL PANEL.....................................................................................................................................................7

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

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

DISASSEMBLY AND ASSMBLY...................................................................................................................................10

INTERLOCK MECHANISM AND ADJUSTMENT.........................................................................................................18

TROUBLE SHOOTING GUIDE......................................................................................................................................19

MESUREMENT AND TEST............................................................................................................................................23

MEASUREMENT OF THE MICROWAVE POWER OUTPUT................................................................................23

MICROWAVE RADIATION TEST ...........................................................................................................................24

COMPONENT TEST PROCEDURE.......................................................................................................................25

WIRING DIAGRAM.........................................................................................................................................................26

PRINTED CIRCUIT BOARD...........................................................................................................................................27

CIRCUIT CHECK PROCEDURE.............................................................................................................................27

P.C.B. CIRCUIT DIAGRAM .....................................................................................................................................30

P.C.B. LOCATION NO.............................................................................................................................................31

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

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

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

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

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SAFETY AND PRECAUTIONS

CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service

Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.

1. FOR SAFE OPERATION

Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.)

1) A broken door hinge.

2) A broken door viewing screen.

3) A broken front panel, oven cavity.

4) A loosened door lock.

5) A broken door lock. The door gasket plate and oven cavity surface should be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL.

2. FOR SAFE SERVICE PROCEDURES

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

2) If any certified oven unit is found to servicing, a microwave emission check should be performed prior to servicing the oven.

(a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance.

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

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS. WAVEGUIDES FLANGES AND GASKETS MUST BE SECURED. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.

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SPECIFICATIONS

MODEL KOG-1A0A9A, 1A6A9A POWER SUPPLY 120V~60HZ, SINGLE PHASE WITH EARTHING POWER MICROWAVE 1400W CONSUMPTION GRILL 1150W MICROWAVE ENERGY OUTPUT 1000W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 539X300X406mm(21.2X16.0X11.8 in.) CAVITY DIMENSIONS (W X H X D) 354X228X373mm(13.9X14.7X9.0 in.) NET WEIGHT APPROX. 16.0Kg (35.3lbs) TIMER 99min. 99sec. FUNCTION SELECTIONS MICROWAVE, GRILL POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.1 Cu.Ft

* Specifications are subject to change without notice.

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EXTERNAL VIEW

539 406

300

1. OUTER DIMENSION

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1we56

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 resisant 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.

12. REFLECTOR (INSULATOR HEATER)

13. HEATING ELEMENT

14. METAL RACK

2. FEATURE DIAGRAM

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r 8

M/W

LESS MORE

Stop/Clear

Grill Defrost

Fish Poultry

Auto Defrost

Meat

Auto

Cook

1. Bread

2. Soup

3. Baked Potato

4. Fresh Vegetable

5. Frozen Vegetable

M/W Defrost Grill Timer/

Start/Speedy cook

Kitchen

Timer

Clock

123

456 789

Beverage

Pasta

Frozen

Pizza

Dish

Warmer

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 increase time to cooking.

6. Less - Used to decrease time from cooking.

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

8. M/W - Used to set power level.

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

10. Kitchen Timer - Used as a 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.

14. Grill - Used to cook grill.

3. CONTROL PANEL

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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 oven failure.

3. Away from Radio and TV sets

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

4. Away from heating appliances and water taps

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

5. Power supply

Check your local power source. This microwave oven requires a current of approximately 12 amperes, 120 Volts, 60 Hz grounded outlet.

Power supply cord is about 0.8 meters long.

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

longer cord.

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

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

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

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

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.

INSTALLATION

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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 on.

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

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

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

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

9. Time clock returns to the present time 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 STOP/CLEAR pad once more. If the oven door is opened during the oven operation, all information is retained.

11. If the START pad is touched and the oven does not operate, check 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.

12. When using the GRILL mode ;

• Do not open the door so often, the temperature inside the oven decrease and the cooking may not be completed in setting time.

• Never touch the oven window and metal interior of the oven when taking food in and out, because the temperature inside the oven and door is very high.

• When using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while handing tray.

Wattage output chart

The power level is set by pressing the M/W 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 outlet.

Touch M/W 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%

Page 11

DISASSEMBLY AND ASSEMBLY

- Cautions to be observed when trouble shooting.

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

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

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

3. Discharge the high voltage capacitor before touching any oven components or wiring. (1) Check the grounding.

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

(2) Warning about the electric charge in the high voltage capacitor.

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

4. When the 20A fuse is blown due to the operation of the monitor

switch; replace primary interlock switch, secondary interlock switch and interlock monitor switch.

5. After repair or replacement of parts, make sure that the screws are

properly tightened, and all electrical connections are tightened.

6. Do not operate without cabinet.

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

WARNING :When servicing the appliance, take care when touching or replacing high potential parts because of

electrical shock or exposing microwave. These parts are as follows - HV Transformer, Magnetron, HV Capacitor, HV Diode.

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1. T o remove cabinet

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. T o 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.

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3. T o remove door parts.

REF NO. PART CODE PART NAME DESCRIPTION Q’TY

A01

3512204330

FRAME DOOR

KOG-1A0A9A

3512204340 KOG-1A6A9A A02 3517005900 BARRIER SCREEN *O PETP T0.25 1 A03 3515202900 STOPPER HINGE *T AS KOR-121M0A 1 A04 3511711300 DOOR PAINTING AS KOR-1A1G0A 1 A05 3517005800 BARRIER SCREEN *I PETP T0.1 1 A06 3512301900 GASKET DOOR PP 1 A07 3513100700 HOOK POM 1 A08 3515101900 SPRING HOOK PW-1 1

(1) Remove the gasket door from door plate. (2) Remove the barrier screen inner from door plate. (3) Remove the door frame from door plate. (4) Remove the stopper hinge top from door plate. (5) Remove the spring and the hook. (6) Remove the barrier screen outer from door frame. (7) Reverse the above steps for reassembly.

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

(1) To reduce gap located on part ‘A’.

• Loosen two 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.

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

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5. T o remove control panel parts.

(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 three 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.

REF NO. PART CODE PART NAME DESCRIPTION Q’TY

B01

3518524250

SWITCH MEMBRANE

KOG-1A0A9A

3518524260 KOG-1A6A9A

B02

3516722330

CONTROL-PANEL

KOG-1A0A9A

3516722340 KOG-1A6A9A B03 PKMPMSX540 PCB AS KOG-131A9A11 1 B04 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 4

B05

3513702800

LEVER DOOR OPEN

KOG-1A0A9A

3513702310 KOG-1A6A9A B06 441G430171 SPRING BUTTON SWP 1

B07

3516907940

BUTTON DOOR OPEN

KOG-1A0A9A

3516907950 KOG-1A6A9A

Page 16

NOTE : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to

prevent 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.

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.

7. High voltage circuit wiring

8. T o remove magnetron.

1) Remove a screw which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

Metallic gasket

Magnetron antenna

plate

Cooling fin

Filament terminal

Page 17

9. 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.

10. 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.

Page 18

11. To remove insulator Heater assembly.

1) Remove the HEX NUT (F09).

2) Remove the two HEX NUTS (F43).

3) Remove the insulator Heater assembly (C00).

4) Reverse the above steps for reassembly.

1) Remove the HEX NUTS (C04).

2) Remove the insulater Heater (C01) and Heater (C02).

3) Remove the two screws (C05).

4) Reverse the above steps for reassembly.

REF NO. PART NAME PART CODE DESCRIPTION Q’TY

C01 INSULATOR HEATER 3513302200 SPP T0.8 1 C02 HEATER 3512802800 120V 1100W 1 C03 SCREW MACHINE 7002500613 TRS 5X6 MFCR 1 C04 NUT HEX 7392500008 6N-2-5 SUS 1 C05 SCREW MACHINE 7002400413 TRS 4X4 MFCR 2 C06 SPACER INSULATOR *I 3515000600 C3771BD 2

Page 19

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 micro switch. Then the button of the primary interlock switch bring it under NO 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 NO condition. The lock lever presses the button of the secondary interlock switch to bring it under NO condition.

(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 two mounting screws.

WH GY

BK/RD WH/WH

PRIMARY INTERLOCK SWITCH

INTERLOCK MONITOR SWITCH

SECONDARY INTERLOCK SWITCH(FRONT)

D.O.M SWITCH(REAR)

LOCK LEVER

DOOR LATCH

WH : WHITE BK : BLACK RD : RED GY : GRAY GN : GREEN BL : BLUE

BUTTON

MOUNTING SCREW

FRONT-PLATE

Condition : DOOR CLOSE Condition : DOOR OPEN

ADJUSTMENT :

Interlock monitor switch When the door is closed, the interlock monitor switch should be changed (NO condition) before other switches are closed.

When the door is opened, the interlock monitor switch should be changed (NC condition) after other switches are opened.

NOTE :

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

, readjust interlock mechanism.

Page 20

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 tranformer, disconnect one load 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.

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

NOTE :

When electric parts are checked, be sure the power cord is not inserted the wall outlet.

Check wire harness, wiring and connection 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 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

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CONDITION CHECK

Check continuity of magnetron

Defective

magnetron

RESULT

Continuity

CAUSE REMEDY

Replace

Outlet has

proper

voltage Fuse

does not

blow.

CONDITION CHECK

Check continuity of primary

interlock switch

Malfunction of

primary interlock

switch

RESULT

Continuity

CAUSE REMEDY

Adjust or

replace

Turntable motor and oven lamp

do not turn

Check continuity of secondary

interlock switch

Malfunction of

secondary

interlock

switch

Continuity

Adjust or

replace

Check D.C. voltage being

supplied 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 D.O.M Switch

Replace

Check continuity of

power supply cord

Open power

supply 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 pad is tapped.

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CONDITION CHECK RESULT

Check continuity of high

voltage capacitor terminals

with wires removed

Continuity

CAUSE

Defective high

voltage

transformer

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

magnetron

Replace

Check resistance of primary and

secondary coil of high voltage

transformer

0 Ω or ∞

Defective high

voltage

transformer

Replace

Check continuity of magnetron

with wires removed

Continuity

Defective

magnetron

Replace

Check continuity of filament

terminal of high voltage

transformer

Continuity

Defective high

voltage

transformer

Replace

Check D.C. voltage being

supplied to RELAY (RY1) coil

0 V

Defective touch

control circuit

Replace

Approx

15 VDC

Faulty

contacts of

RELAY (RY1)

or open

relay coil

Replace

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

Page 23

(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 are not on when they 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 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.

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 each pad for

continuity of the membrane

keyboard for the following

keyboard check procedure

Malfunction

of touch control circuit of control box

sub-assembly

RESULT

Normal

CAUSE REMEDY

Replace

control 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.

M/W Defrost Grill Timer/

Page 24

MEASUREMENT AND TEST

1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT

Microwave output power can be checked by indirectly mmeasuring 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). If 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 heatup 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.

• t is the heating time.

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

✻ Heating time for power output:

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)

P =

4187 X ∆T

600

650

700

750

800

850

900

950421000401050381100

A (second)

B (W)

Page 25

2. MICROWAVE RADIA TION 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 600 cc 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.

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 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 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.

Page 26

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

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 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 in both directions. 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 0.1 Ω 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.

Page 27

WIRING DIAGRAM

Page 28

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: 120V / Frequency: 60Hz

2. Voltage Check

- Key check point

- Check method

NOTE

1. Refer to Ciruit 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.

NOTE

Each measure point must be measured with GND points.

Terminal Voltage

4-7

LOAD

AC 12.6 V

NO LOAD AC 14.7 V

NO CHECK POINT REMARK

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

3 IC1 PIN 31 OR 32

T : 16.67ms(60Hz)

T : 250 ns(4MHz)

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

Page 29

MP1

MP2

Mesure point

Page 30

3. When there is no microwave oscillation

1) When touching START pad, oven lamp does not turn on.

Fan motor does 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 there is no grill oscillation.

✻ Cause : RELAY 3 does not operate. → refer to Circuit Diagram (point 6)

- Check method

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

→ refer to Circuit Diagram (point 1)

- Check method

6. 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.

POINT

STATE

RELAY 2 ON -5VDC GND

RELAY 2 OFF GND -12VDC

POINT

STATE

RELAY 1 ON -5VDC GND

RELAY 1 OFF GND -12VDC

POINT

STATE

RELAY 3 ON -5VDC GND

RELAY 3 OFF GND -12VDC

POINT

STATE

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 Replace door open monitor switch.

switch by resistance measurement.

POINT WAVE FORM

T: 16.67 ms(60Hz)

Page 31

2. P.C.B. CIRCUIT DIAGRAM

Page 32

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 50V RS 1µF CEXE1H109A 1 4 CPAPCITOR ELEC EC2 25V RSS 1000µF CEXF1E102V 1 5 CONNECTOR WAFER CN1 YW396-02AV 3519150520 1 6 CONNECTOR WAFFR CN2 YW396-05AV 3519150510 1 7 CONNECTOR WAFER CN3 FCZ254-11 441M367160 1 8 DIODE RECTIFY D1~6, 8~12, 15 1N4148 DZN4148--- 12

9 DIODE RECTIFY D13, 14 1N4004A DZN4004A-- 2 10 DIODE ZENER ZD1 UZ-5.1BSB 1/2W DZUZ5R1BSB 1 11 DIODE ZENER ZD2 UZ-3.3BSB 1/2W DZUZ3R3BSB 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 220 5% RD-AZ221J- 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 RESISTOR R23 1/6W 4.7K 5% RD-AZ472J- 1 23 REGULATOR VL1 MC7905C 1MC7905C-- 1 24 TRANSISTOR Q1~5, 8~11 KRA-106M TZRA106M-- 9 25 TRANSISTOR Q6 KTA-1266 TZTA1266Y- 1 26 TRANS POWER LVT1 DMR-631P 5EPU035302 1 27 WIRE COPPER

J1~3,5~8,10~12,17~21

1/0.52 TIN COATING 85801052GY 15 28 WIRE COPPER SJ1, 4, 5 1/0.52 TIN COATING 85801052GY 3 29 IC MICOM IC1 TMP47C440BN-NF94 13GS371GH0 1 30 RESONATOR CERA CR1 KBR-4.0MSTF 5PKBR40MKS 1 31 SW RELAY RY1, RY3 G5G-1A DC 12V 5SC0101121 2 32 SW RELAY RY2 OJ-SS-112LM 5SC0101404 1 33 CAPACITOR CERA C6 102 50V Z AXIAL CCZB1H102K 1 34 CAPACITOR CERA C1, C3~C5, C7 104 50V Z AXIAL CCZF1H104Z 5

3. P.C.B. LOCA TION NO

Page 33

EXPLODED VIEW AND PARTS LIST

1. DOOR ASSEMBLY

Refer to Disassembly and assembly

2. CONTROL PANEL ASSEMBLY

Refer to Disassembly and assembly

3. TOTAL ASSEMBLY

Page 34

REF NO PART CODE PART NAME DESCRIPTION Q'TY

A00

3511711230

DOOR AS

KOG-1A0A9A

3511711240 KOG-1A6A9A

B00

PKCPSWX820

CONTROL PANEL AS

KOG-1A0A9A

PKCPSWAP40 KOG-1A6A9A

C00 3513302410 INSULATOR HEATER AS KOG-211M0A 1

F01 3510805500 CABINET AS KOR-1A1G0A 1 F02 3516004100 SPECIAL SCREW T1 TRS LR4 POLE 4X10 SE MFZN 3 F03 3516116500 CAVITY AS KOG-1A4H9S 1 F04 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F05 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F06 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F07 35113TCN35 CORD POWER AS 3X16AWG 40X40 120-RTM 1 F08 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F09 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 1 F10 7121403011 SCREW TAPPING T2S PAN 4*30 MFZN 2 F11 3963821610 MOTOR SHADED POLE 120V 60HZ MW10XA-M01 1 F12 3512517000 GUIDE WIND PP 1 F13 3511800300 FAN PP GF30 1 F14 3518002900 MAGNETRON 2M218J(F)P 1 F15 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5X12 DACRO 1 F16 7122400811 SCREW TAPTITE T2S TRS 4*8 MFZN 1 F17 3513003200 HOLDER HV CAPACITOR SECC T0.6 1 F18 3518302201 CAPACITOR HV 2100VAC 0.98UF #187 1 F19 3518400400 DIODE HV HVR-1X-3AB 12KV #187 1 F20 3518119510 TRANS HV DW-R95A0-1AT 1 F21 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 F22 3510312400 BASE SBHG T0.7 1 F23 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 5 F24 3512100900 FOOT PP DASF-130 2 F25 7272400811 SREW TAPTITE TT3 TRS 4X8 NFZN 1 F26 3515202800 STOPPER HINGE *U AS KOR-121M0A 1 F27 3512719910 HARNESS MAIN KOG-1A0A9A 1 F28 4415A17352 SW MICRO VP-533A-0F SPNO #187 200G 1 F29 4415A66600 SW MICRO VP-532A-OF SPNC #187 200G 1 F30 4415A66910 SW MICRO VP-531A-OF/SZM-V16-FA-61 1 F31 3518571000 SWITCH PUSH MP101C 1 F32 3513702600 LEVER LOCK POM 1 F33 3513811700 LOCK POM 1

Page 35

REF NO PART CODE PART NAME DESCRIPTION Q'TY

F34 3513601500 LAMP BL 125V 25W T25 C5A H187 1 F35 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 F36 3966820200 MOTOR SYNCRO 120V 2W GM-16-12F17 1 F37 3518905400 THERMOSTAT OFF:90 ON:60 H#187 NB 1 F38 3513003410 HOLDER THERMOSTAT PP 1 F39 7272400811 SPECIAL TAPTITE TT3 TRS 4X8 MFZN 2 F40 3511405100 COVER WAVE GUIDE MICA T0.35 1 F41 4078502031 BUTTON LOCKING PP 2 F42 3517400620 COUPLER XAREC 1 F43 7S627W50X1 NUT HEX NUT FLANGE M5X0.8P MFZN 2 F44 3514701510 ROLLER TEFLON 3 F45 3512502310 GUIDE ROLLER XAREC 1 F46 441X335A10 TRAY GLASS 1 F47 3517209600 TRAY RACK AS KOG-1A4H9S 100MM 1 F48 3518904900 THERMOSTAT OFF:90 ON:80 H #187 NB 1 F49 7121300611 SCREW TAPPING T2S PAN 3*6 MFZN 1

Page 36

담담 당당 주주홍홍준준님님 TTEELL MMOODDEELL

KOG-1A0A9A,1A6A9A

접접 수수 0055..0055..1111

1차 6차 2차 7차

일일 정정

3차 8차 4차 9차

5차 10차 제제 판판 인인쇄쇄 규규 격격 MMEEMMOO

05.05.11-(KOG-131A9A11:파일없음,KOG-131A0A 만듬) 표지,4,5,12,14,31,32.33,34P 수정

연연락락처처

VVIISSIIOONN

담담 당당

이지혜

TEL: 730-0660 FAX: 730-3788

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ABOUT THIS MANUAL

DAEWOO KOG-1A0A9A, KOG-1A6A9A Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual