Daewoo KOC-922T, KOC-923T Service Manual

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Service Manual

Microwave Oven

Model: KOC-922T9S

KOC-922T9R

KOC-923T9S

KOC-923T9R

DAEWOO ELECTRONICS CORP.

S/M No. : C922T9S001

http : //svc.dwe.co.kr Oct. 2003

✔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).

PRECA UTIONS T O BE OBSERVED BEFORE AND DURING SER VICING T O AVOID POSSIBLE EXPOSURE T O EXCESSIVE MICROW AVE 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.

TABLE OF CONTENTS

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

2. SPECIFICATIONS ........................................................................................................................................................3

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

3-1. OUTER DIMENSION..........................................................................................................................................4

3-2. FEATURE DIAGRAM ........................................................................................................... ..............................5

4. INSTALLATION............................................................................................................................................................6

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

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

7. INTERLOCK MECHANISM AND ADJUSTMENT.....................................................................................................19

8. TROUBLE SHOOTING GUIDE..................................................................................................................................20

9. MESUREMENT AND TEST .......................................................................................................................................25

9-1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT........................................................................25

9-2. MICROWAVE RADIATION TEST....................................................................................................................26

9-3. COMPONENT TEST PROCEDURE................................................................................................................27

9-4. COMPONENT ACTION....................................................................................................................................28

10. WIRING DIAGRAM...................................................................................................................................................29

11. EXPLODED VIEW AND PARTS LIST.....................................................................................................................30

11-1. DOOR ASSEMBLY.........................................................................................................................................30

11-2. CONTROL PANEL ASSEMBLY.....................................................................................................................30

11-3. TOTAL ASSEMBLY........................................................................................................................................30

12. PRINTED CIRCUIT BOARD ....................................................................................................................................33

13. P.C.B CIRCUIT DIAGRAM.......................................................................................................................................39

1. SAFETY AND PRECA UTIONS

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.

(1) inform the manufacturer, importer or assembler,

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

(3) attempt to ascertain the cause of the excessive leakage,

(4) 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 immediately.

IMPORTANT

The wire in this mains lead coloured in accordance with the following code.

Green-and-yellow : Earth Blue : Neutral

Brown : Live As the colours of the wires in the mains lead of this appliance may 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 terminal in the plug which is marked with the letter E , earth symbol or coloured green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red.

NOTE : This oven is designed for counter-top use only.

2. SPECIFICATIONS

MODEL KOC-922T9S/923T9S POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING

MICROWAVE 1500W

1150W

POWER GRILL CONSUMPTION CONVECTION 2550W

COMBINATION 3000W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X503mm (21.3X13.0X19.8 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm (13.8X9.1X14.0 in.) NET WEIGHT APPROX. 20kg (44.1 lbs.) TIMER 60 minutes FUNCTION SELECTIONS

MICROWAVE / GRILL / CONVECTION / COMBINATION POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu. Ft

MODEL KOC-922T9R/923T9R POWER SUPPLY 230V~50HZ, SINGLE PHASE WITH EARTHING

MICROWAVE 1500W

1150W

POWER GRILL CONSUMPTION CONVECTION 1450W

COMBINATION 1500W MICROWAVE ENERGY OUTPUT 1000W(IEC705) MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 542X329X503mm (21.3X13.0X19.8 in.) CAVITY DIMENSIONS (W X H X D) 350X230X355mm (13.8X9.1X14.0 in.) NET WEIGHT APPROX. 20kg (44.1 lbs.) TIMER 60 minutes FUNCTION SELECTIONS

MICROWAVE / GRILL / CONVECTION / COMBINATION POWER SELECTIONS 10 LEVELS CAVITY VOLUME 1.0 Cu. Ft

* Specifications are subject to change without notice.

3. EXTERNAL VIEW

1. OUTER DIMENSION

542 503

329

11.DOOR HOOK

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

12.DOOR VIEWING SCREEN

Allows viewing of food. The screen is designed so that light can pass through, but not the microwave.

13.METAL RACK

14.TOP HEATER

Turns on when convection, grill and combi cooking is selected.

15.OVEN LAMP

Automatically turns on during oven operating.

16.SAFETY INTERLOCK SYSTEM

17.CONTROL PANEL

18.TURNTABLE TRAY

Rotates during cooking and ensure even distribution of Microwaves. It can also be used as a cooking utensil.

19.ROLLER GUIDE

This must always be used for cooking together with the turntable tray.

10. COUPLER

This fits over the shaft in the center of the ovens cavity floor. This is to remain in the oven for all cooking.

11. CONVECTION OUTLET & FAN

12. OVEN FRONT PLATE

13.DOOR SEAL

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

2. FEATURE DIAGRAM

23456

890qwe

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

Check your local power source. This microwave oven requires a current of approximately 15(KOC-922T9S/923T9S)

12(KOC-922T9R/923T9R) amperes, 230V, 50Hz.

Power supply cord is about 1.2 meters long.

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.

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

Such a cable can be purchased from 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 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.

4. INSTALLATION

EARTHING INSTR UCTIONS

WARNING

Improper use of the earthing plug can result in a risk of electric shock. Consult a qualified electrician of 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 accept the plug on the 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.

5. CONTROL PANEL

1. Roast pork 2. Roast beef

3. Roast chicken 4. Baked fish 5. Fresh vegetable

Display : Cooking time, power level, indicators and

present time are displayed.

MW : When blinking, the oven is operating in

MICROWAVE COOK.

Grill :

When blinking, the oven is operating in GRILL.

Combi : When blinking, the oven is operating in

COMBI.

Defrost Weight : When blinking, the oven is

operating in WEIGHT DEFROST.

Time : When blinking, the oven is operating in TIME

DEFROST.

Auto-cook : When blinking, the oven is operating

AUTO COOK. Lock : When lighting, the oven is CHILD LOCK. Con-vection : When blinking, the oven is operating

in CONVECTION.

g : When blinking, the oven is operating in weight

input mode.

Auto cook : Used to cook or reheat.

Clock : Used to set clock.

Time Defrost : Used to defrost foods.

Weight Defrost : Used to defrost foods.

MW : Used to set power level of micro wave.

Convection : Used to select convection and selected

temp.

Combi : Used to select combi.

Grill : Used to select grill.

Dial knob : Used to set time, weight and quantity.

START/SPEEDY COOK : Used to start a programmed, also for speedy start(each press adds 30 seconds microwave cooking time).

STOP/CLEAR : Used to stop the oven operation or to delete the cooking data.

KOC-922T9S, KOC-922T9R

KOC-923T9S, KOC-923T9R

Display : Cooking time, power level, indicators and

present time are displayed.

MW : When blinking, the oven is operating in

MICROWAVE COOK.

Grill :

When blinking, the oven is operating in GRILL. Combi : When blinking, the oven is operating in COMBI. Defrost Weight : When blinking, the oven is

operating in WEIGHT DEFROST.

Time : When blinking, the oven is operating in TIME

DEFROST.

Auto-cook : When blinking, the oven is operating

AUTO COOK. Lock : When lighting, the oven is CHILD LOCK. Con-vection : When blinking, the oven is operating

in CONVECTION.

g : When blinking, the oven is operating in weight

input mode.

Auto cook : Used to cook or reheat.

Combi : Used to select combi.

Convection : Used to select convection and

selected temp.

MW : Used to set power level of micro wave.

Grill : Used to select grill.

Time Defrost : Used to defrost foods.

Weight Defrost : Used to defrost foods.

Clock : Used to set clock.

Pizza : Used to cook or reheat pizza.

Time set pad : Used to set time, weight and quantity.

START/SPEEDY COOK : Used to start a programmed, also for speedy start(each press adds 30 seconds microwave cooking time).

STOP/CLEAR : Used to stop the oven operation or

to delete the cooking data.

6. 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 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, 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.

1. T o remo ve cabinet

1) Remove four screws on cabinet back.

2) Push the cabinet backward.

2. T o remo ve door assembl y

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 assemby.

NOTE: After replacing the door assembly, perform a check

of correct alignment with the hinge and cavity front plate.

3. T o remo ve door parts.

REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK

A01 3512204830 FRAME DOOR ABS SR-0320 1 A02 3517007150 BARRIER-SCREEN*0 GLASS T3.2 MIRROR 1 A03 3515304800 SUPPORTER HINGE*T SCP-1 T2.0 1 A04 3516602200 DOOR PLATE SBHG-3A T0.7 1 A05 3517007000 BARRIER-SCREEN*I TEMP GLASS T2.0 1 A06 3512302400 GASKET DOOR PBT 1 A07 3513101200 HOOK POM 1 A08 3515101800 SPRING HOOK PW1 1

(1) Remove the gasket door from door plate. (2) Remove the door frame from door plate. (3) Remove the stopper hinge top from door plate. (4) Remove the spring and the hook. (5) Remove the barrier screen outer from door frame. (6) 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 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

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.

5. T o remove control panel parts.

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

B01 3515501320 WINDOW DISPLAY SAN 1 B02 3516725230 CONTROL-PANEL ABS SR-0320 1 B03 3516911900 BUTTON FUNCTION-A ABS SR-0760D SPRAY 1 B04 3516909970 BUTTON FUNCTION-C ABS SR-175 SG-0760D SPRAY 1 B05 3516909960 BUTTON FUNCTION-B ABS SR-175 SG-0760D SPRAY 1 B06 3513406600 KNOB VOLUME ABS SR-175 SG-0760D 1 B07 PKMPMSYQ00 PCB MAIN MANUAL AS KOC-922T9S 1 922T9S

PKMPMSYQ10 KOC-922T9R 922T9R B08 7121301011 SCREW TAPPING T2S PAN 3X10 MFZN 7 B09 PKBPMSYQ00

PCB BUTTON MANUAL AS

KOC-922T9S 1 B10 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4 B11 3516909980 BUTTON FUNCTION-D ABS SG-175 SG-0760D SPRAY 1

(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. (2) Remove four screws(B10) which secure the PCB Main ASS’Y. (3) Pull out the Main PCB assembly(B09). (4) Remove seven screws(B08) which secure the PCB Sub ASS’Y. (5) Pull out the Sub PCB assembly(B07). (6) Pull out the Knob volume(B06) from the Sub PCB assembly. (7) Pull out buttons from the control panel. (8) Pull out Window display(B01) from the control panel. (9) Reverse the above steps for reassembly.

✔ 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).

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

B01 3518524300 SWITCH MEMBRANE KOC-923T9S 1 B02 3516725250 CONTROL-PANEL ABS SR-0320 1 B03 PKMPMSAS00 PCB MAIN MANUAL AS KOC-923T9S 1 923T9S

PKMPMSAS10 KOC-923T9R 923T9R

B04 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 4

(1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. (2) Remove four screws which secure the PCB assembly to control panel. (3) Disconnect membrane tail from the connector of the PCB assembly. (4) Detach membrane from the control panel. (5) Reverse the above steps for reassembly.

✔ Caution

CAUTION : 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.

Magnetron antenna

Metallic gasket plate

Cooling fin

Filament terminal

6. T o remo ve high v oltage 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 remo ve magnetr on.

1) Remove a screw which secure the magnetron.

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

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 reasembly.

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.

1) Remove a screw 1and pull out Guide air outlet 2.

2) Remove two screws

and pull out insulator heater *t3.

3) Pull out the Top heater assembly.

4) Pull out the Harness heater

5) Pull out the Braket heater*t from the Cover heater*t

6) Pull out the Heater miraclon

from the Cover heater*t8.

7) Reverse the above steps for reassembly.

10. To remove Top heater assembly parts.

5 6

1 2

3 4

REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK

1 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 2 3512520500 GUIDE AIR OUTLET SA1D T0.5 1 3 3513303000 INSULATOR HEATER*T SECC T0.5 1 4 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 2 5 3512767000 HARNESS HEATER KOC-1B0K0S 1 6 3510607700 BRACKET HEATER *T SA1D T0.5 1 7 3512803800 HEATER MIRACLON 115V 550W 270MM 2 8 3511407600 COVER HEATER *T STS430 T0.5 1

✔ Caution

11. To remove Rear heater assembly parts.

1) Remove a screw 1and pull out Cover motor *B2.

2) Remove a screw

and pull out Cover *B4.

3) Pull out the Harness convection-B

4) Remove four screws

and then pull out the Rear heater assembly.

5) Remove a Nut and the pull out the Fan convection

6) Remove three screws

and then separate the Cover heater *B7and the lnsulator heater *B8.

7) Pull out the Heater

from the Cover Heater *B7.

8) Remove two screw

and then separate the lnsulator heater *B8and Motor shaded polet.

9) Remove the C-Ring

and then pull out the Fanyfrom Motor shaft.

10)Reverse the above steps for reassebly.

14 15 16 17

2345678910111213

REF NO. PART CODE PART NAME DESCRIPTION Q TY REMARK

1 3511407300 COVER MOTOR*B SA1D-80 T0.5 1 2 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 3 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 4 3511407900 COVER*B SA1D-80 T0.5 1 5 3512767600

HARNESS CONVECTION

KOC-924T0S 1 6 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 4 7 3511409800 COVER HEATER*B SA1D-80 T0.5 1 8 3513303400 INSULATOR HEATER*B SBHG-1 T0.5 1 9 7113400814 SCREW TAPPING T1 BIN 4*8 MFNI 3

10 3511800700 FAN CONVECTION SA1D-80 T0.5 1 11 3513002300 HOLDER HEATER SUS430 T-.5 3 12 3512801800 HEATER 230V 1400W 1R18344 1 13 7400104011 WASHER PLAIN PW-1-4 MFZN 1 14 7051400811 SCREW MACHINE PAN 4*8 SW MFZN 2 15 3963514300 MOTOR SHADED POLE 230V 50HZ MW10CA-T02 1 16 3511800800 FAN P.P GF20 1 17 7402704600 RING C CR-5 SK5 1

✔ Caution

7. 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 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.

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 emission exceed 4mW/cm

, readjust interlock mechanism.

8. 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 ( COM NC )

Check continuity of both primary and secondary interlock switch with door closed

Malfunction of Interlock monitor switch

Malfunction of interlock switch

RESULT

Continuity

No continuity

CAUSE REMEDY

Replace

(COM NC)

Fuse blows.

Replace

Shorted contacts of primary interlock Switch

Continuity

Replace

Check continuity of primary interlock switch contact with door partially open until interlock monitor switch contact close ( COM NC close )

Defective low voltage transformer

Defective high voltage transformer

or infinite Replace

Replace

Check continuity of primary winding of low voltage transformer

Disconnect high voltage fuse and operate the unit

Continuity

Approx.

480

~620

( normal )

Fuse again

blows

CONDITION CHECK

Check continuity of

magnetron

Defective

magnetron.

RESULT

continuity

CAUSE REMEDY

Replace

Outlet has

proper

voltage

fuse does not

blow?

Check continuity of noise filter

board

Defective line

filter board

continuity

Replace

Check continuity of

power supply cord

Defective touch

control circuit

Replace

Open power

supply cord

continuity

Replace

NOTE : All these switches must be replaced at the same time, please refer to (7.Interlock mechanism and

adjust) for adjustment instructions

(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.

CONDITION CHECK

Check continuity of

primary interlock switch

Malfunction of

primary interlock

switch

RESULT

continuity

CAUSE REMEDY

Adjust or

replace

Turn table motor and

oven lamp

not turn on

Check D.C voltage

being supplied to RELAY(RY4) coil

Fault contacts

of RELAY

(RY4) or open

relay coil.

Replace

Check continuity of

secondary interlock

and D.O.M switch

Malfunction of

secondary

Interlock and

D.O.M switch

continuity

Adjust or

replace

Defective touch

control Circuit

Approx. 24V DC

Replace

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

transformer

Defective

high voltage

fuse

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

Check resistance of primary and secondary coil of high voltage transformer

0 or

Defective

high voltage

transformer

Replace

Check continuity of

high voltage fuse

No microwave oscillation

continuity

Check continuity of magnetron heater with wires removed

No continuity

Defective

magnetron

Replace

Check continuity of filament terminal of high voltage transformer

No continuity

Defective high

voltage

transformer

Replace

Check D.C voltage

being supplied to

RELAY (RY1) coil

0 V

Defective

touch control

circuit

Replace

Approx.

24V DC

Faulty contacts of

RELAY

(RY1) or open

relay coil

Replace

(TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot.

CONDITION CHECK

Check continuity of

primary interlock switch

Malfunction of

primary Interlock

switch

RESULT

continuity

CAUSE

REMEDY

CAUSE

REMEDY

Adjust or

replace

Grill heater is

not heated.

Check D.C voltage

being supplied to

RELAY (RY2) coil

Faulty contacts of

RELAY

(RY2) or open

relay coil

Replace

Check continuity of

secondary interlock switch

Malfunction of

secondary

interlock switch

continuity

Adjust or

replace

Defective touch

control circuit

Approx. 24V DC

Replace

Check continuity of

heater

Defective heater

continuity

Replace

(TROUBLE 5)

1) Convection heater is not heated; food will not become hot.

2) Convection fan motor does no rotate.

CONDITION CHECK

Check continuity of

primary interlock switch

Malfunction of

primary Interlock

switch

RESULT

continuity

Adjust or

replace

1)Convection heater is not

heated.

2)Convection

fan and

motor does

not rotate.

Check D.C voltage

being supplied to

RELAY (RY3, RY6) coil

Faulty contacts of

RELAY

(RY3,RY6) or

open relay coil

Replace

Check continuity of

secondary interlock

switch

Malfunction of

secondary

interlock switch

continuity

Adjust or

replace

Defective touch

control circuit

Approx.

24V DC

Replace

Check continuity of

(heater or motor)

Defective motor

continuity

Replace

CONDITION CHECK

Check each button for

continuity of the button

Malfunction of sub

pcb assembly

RESULT

Normal

CAUSE REMEDY

Replace

control box

sub-assembly

Display does

not show

programming

at all, even if

keyboard is

touched.

(TROUBLE 6) The following visual conditions inditions indicate a probable defective touch control Circuit or button P.C.B. assembly

1. Incomplete segments.

1) segment missing

2) partial segments missing

3) digit flickering other than normal fluorescent slight flickering

2. A distinct change in the brightness of one or more numbers exists in the display

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

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

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

6. Display obviously jumps in time while counting down.

7. Display counts down noticeably too fast while cooking.

8. Display does not show the time of day when clear button is touched.

9. Oven lamp and turn table motor do not stop although cooking is finished.

Check if the RELAY(RY4) contacts close and if they are close, replace touch control circuit.

CAUSE

REMEDY

(TROUBLE 7) When ERROR 2 ERROR 3 come on display.

CONDITION CHECK

Check continuity of thermistor

(resistance of thermistor)

Replace

RESULT

0 or infinite

Replace

ERROR 2 &

ERROR 3

come on

display

Check continuity of heater (convection, upper, lower)

Defective touch

control circuit

Replace

Approx

200~300k

(room

temperature)

Defective

heater

continuty

continuity

Replace

9. MEASUREMENT AND TEST

1. MEASUREMENT OF THE MICROWAVE PO WER 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. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm. The mass of the container is determined.

2. At the start of the test, the oven and the empty container are at ambient temperature. Water having an initial temperature of 10

C1C is used for the test. The water temperature is measured immediately before it is poured

into the container.

3. A quantity of 1000g

5g of water is added to the container and its actual mass obtained. The container is then immediately placed in the centre of the oven shelf, which is in its lowest normal position. The oven is operated and the time for the water temperature to attain 20

C2C is measured. The oven is then switched off and the final water temperature is measured within 60s.

NOTE 1 - The water stirred is before its temperature is

measured.

NOTE 2 - Stirring and measuring devices are to have a

low heat capacity.

4. The microwave power output is calculated from the formula

where P is the microwave power output, in watts ; m

is the mass of the water, in grams ;

is the mass of the container, in grams ;

is ambient temperature, in degrees Celsius ;

is the initial temperature of the water, in degree Celsius ;

is the final temperature of the water, in degrees Celsius ;

t is the heating time, in seconds, excluding the magnetron filament heating-up time.

The microwave power output is stated in watts, rounded off to the nearest 50W

Heating time for power output: (T

= T0)

CAUTION

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

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 = 4,187 mW(T2-T1) + 0.55 mC(T2- T0)/t

600

650

700

750

800

850

900

950421000401050381100

A (second)

B (W)

2. MICROW AVE RADIATION 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.

WARNING

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. 100

10% Filament winding ... Approx. 0 Primary winding ... Approx. 1.2

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

once the capacitor charged.

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 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

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.

4. COMPONENT ACTION

COOKING MODE

M/W GRILL-1 GRILL-2 GRILL-3 COMBI-1 COMBI-2

MANUAL

COMBI-3

MODE

COMBI-4 COMBI-5 CONVECTION100~130 CONVECTION140~150 CONVECTION160~250

ONE

CAKE/BREAD

TOUCH

CRUSTY ROAST BEEF ROAST CHICKEN ROAST PORK BAKED FISH

AUTO

BAKED POTATO

MODE

BAKED POTATO ROAST POTATO FRESH VEGETABLES FROZEN VEGETABLES CASSEROLE

MAGNETRON

UPPER ELEMENT

LOWER ELEMENT

REAR ELEMENT

CONVECTION F AN

10. WIRING DIA GRAM

YW : YELLOW

BR : BROWN

: OFF

COOK

DOOR : CLOSED

CONDITION

CM : CONVECTION FAN MOTOR

[

OL : OVEN LAMP

FM : FAN MOTOR

RD : RED

WH : WHITE

BK : BLACK

BL : BLUE

]

GE : GREEN/YELLOW

GN : GREEN

NOTE :

TTM : TURNTABLE MOTOR

TTM

SECONDARY

PRIMARY

INTERLOCK

MONITOR

SWITCH

TRANSFORMER

MAGNETRON

H.V. DIODE

CAPACITOR

H.V.

SWITCH(UPPER)

INTERLOCK

SWITCH

HIGH VOLTAGE

COM.

NO.

NC.

SINGLE PHASE

POWER SUPPLY :

FUSE

LINE FILTER ASS Y

D.O.M. SWITCH

CONTROL P.W.B. ASS Y

CUT-OUT

THERMAL

H.V.

FUSE

ONLY

FAN

RELAY

CONVECTIONMOTOR POWER

RELAY RELAYHEATER

RELAY

THERMISTOR

L.V. TRANSFORMER

CONVECTION HEATER

COM.

NO.

NC.

TOP HEATER

TOP

HEATER

RELAY

CONVECTION

FAN

RELAY

11. EXPLODED VIEW AND PARTS LIST

1. DOOR ASSEMBLY

Refer to 6. Disassembly and assembly.

2. CONTROL PANEL ASSEMBLY

Refer to 6. Disassembly and assembly.

3. TOTAL ASSEMBLY

NO PART CODE PART NAME DESCRIPTION Q’TY NOTE

A00 3511714540 DOOR AS KOC-922T9S 1 B00 PKCPSWYQ00 CONTROL PANEL AS KOC-922T9S 1

PKCPSWAS00 KOC-923T9S

PKCPSWYQ10 KOC-922T9R

PKCPSWAS10 KOC-923T9R F01 3516003700 SPECIAL SCREW TT3 HEX 4*8 FLG MFZN 2 F02 3512521000 GUIDE ROLLER AS KOC-1BOKOS 1 F03 3517205200 TRAY METAL SPP T0.6 1 F04 3517202611 TRAY RACK AS KOC-961C0S 117MM 1 F05 3517401900 COUPLER PTFE 1 F06 3511408300 COVER WAVE GUIDE MICA T0.35 1 F07 3516112320 CAVITY AS KOC-924T0S 1 F08 3512767000 HARNESS HEATER KOC-1B0KOS 1 F09 3510607700 BRACKET HEATER*T SA1D-80 T0.5 1 F10 3512803800 HEATER MIRACLON 115V 550W 270MM 2 F11 3511407600 COVER HEATER*T STS430 T0.5 1 F12 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F13 3512520500 GUIDE AIR OUTLET SA1D-80 T0.5 1 F14 3513303000 INSULATOR HEATER*T SECC T0.5 1 F15 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 2 F16 7121400611 SCREW TAPPING T2S PAN 4*6 MFZN 1 F17 3518906310 THERMOSTAT OFF:100 ON:60 V #187 1 F18 7112401011 SCREW TAPPING T1 TRS 4*10 SE MFZN 2 F19 35113A5QJ5 CORD POWER AS 3*1.5 80*80 120-RTML 1.0M 1

KOC-922T9S/923T9S

35113A5QM5 3*1.0 80*80 120-RTML 1.4M

KOC-922T9R/923T9R F20 3511800100 FAN PP GF20 1 F21 3963513010 MOTOR SHADED POLE 230V 25W MW15CA-B01 1 F22 3512515300 GUIDE WIND PP 1 F23 3518605001 NOISE-FILTER DWLF-M05 1

KOC-922T9S/923T9S

3518605500 DWLF-M07

KOC-922T9R/923T9R F24 7S312X40A1 SCREW SPECIAL T1 TRS 4*10 SE MFZN 1 F25 7121403011 SCREW TAPPING T2S PAN 4*30 MFZN 2 F26 3510803500 CABINET SECC T0.6 1 F27 7S312X40A1 SCREW SPECIAL T1 TRS 4*10 SE MFZN 4 F28 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F29 3511407300 COVER MOTOR*B SA1D-80 T0.5 1 F30 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F31 3511407900 COVER*B SA1A-80 T0.5 1 F32 3511800800 FAN PP GF20 1 F33 3512767600 HARNESS CONVECTION KOC-924T0S 1 F34 7402704600 RING C CR-5 SK5 1

✔ Caution

NO PART CODE PART NAME DESCRIPTION Q’TY NOTE

F35 3963514300 MOTOR SHADED POLE 230V 50HZ MW10CA-T02 1 F36 3513303400 INSULATOR HEATER*B SBHG-1 T0.5 1 F37 3511409800 COVER HEATER*B SA1D-80 T0.5 1 F38 3511800700 FAN CONVECTION SA1D-80 T0.5 1 F39 3512801800 HEATER 230V 1400W 1R18344 1 F40 3513002300 HOLDER HEATER SUS304 T0.5 3 F41 7400104011 WASHER PLAIN PW-1-4 MFZN 1 F42 3512718320 HARNESS MAIN KOC-924T0S 1 F43 3516004000 SPECIAL SCREW T2 BOLT FLANGE 5*12 DACR 1 F44 3518002900 MAGNETRON 2M218J(F)P 1 F45 7122401211 SCREW TAPPING T2S TRS 4*12 MFZN 1 F46 3513601600 LAMP BL 240V 25W T25 C7A H187 1 F47 3513700800 LEVER LOCK POM 1 F48 4415A17352 SW MICRO VP-533A-OF SPNO #187 200 2 F49 3513816000 LOCK PP 1 F50 3513702100 LEVER SW MICRO POM, KOG-846T0S 1 F51 4415A66910 SW MICRO VP-531-OF/SZM-V16-FA-61 2 F52 7S422X4081 SCREW SPECIAL TT3 TRS 4*8 SE MFZN 1 F53 3513003200 HOLDER HV CAPACITOR SECC T0.6 1 F54 3518400400 DIODE HV HVB-1X-3AB 12KV #187 1 F55 3518302300 CAPACITOR HV 2100VAC 1.1OUE #187 1 F56 3518701400 FUSE HV 5KV 0.7A 1 F57 3518118910 TRANS HV DW-N10S0-92T 1 F58 7147401011 SCREW TAPPING T2 FLG HEX 4*10 MFZN 4 F59 3512101400 FOOT DASE-310 4 F60 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 5 F61 3510313600 BASE SBHG T0.8 1 F62 7272400811 SCREW TAPTITE TT3 TRS 4*8 MFZN 1 F63 3515202800 STOPPER HINGE*U AS KOR-121M0A 1 F64 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 1 F65 3966510200 MOTOR SYNCRO 230V 25W GM-16-24FD24 1 F66 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 1 F67 3514801400 SENSOR TEMPERATURE PTM-K312-D7 1

✔ Caution

CIRCUIT CHECK PROCEDURE

1. Low voltage transformer check

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

2. Voltage Check

- Key check point

- Check method

NO CHECK POINT REMARK

1 IC1 PIN 20, 21(KOC-922T9S/R) 5VDC 5%

IC1 PIN 26, 27(KOC-923T9S/R)

IC1 PIN 22 (KOC-922T9S/R)

IC1 PIN 28 (KOC-923T9S/R)

3 IC1 PIN 8 OR 9

12. PRINTED CIRCUIT BO ARD

NOTE

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

2. The allowable tolerance of the secondary voltage is within

5% of nominal voltage.

NOTE: Each measure point must be measured with GND points.

Terminal

6-7 8-9

9-10

Voltage(load)

AC 17.0 V

AC 1.3 V AC 1.3 V

Voltage(no load)

AC 19.9 V

AC 1.6 V AC 1.6 V

T : 20 ms(50Hz)

5V 0V

T : 250 ns(4MHz)

NO MEASURE POINT WAVE FORM REMEDY REMARK

1 MP1 DC 5V 5% Replace ZD2, EC1 NO LOAD 2 MP2 DC 24V 20%

Replace D17-D20, EC4(KOC-922T9S/R)

NO LOAD

Replace D18-D21, EC4(KOC-923T9S/R)

MP1

GND

MP2

MEASURE POINT OF KOC-922T9S/R

MP1

GND

MP2

MEASURE POINT OF KOC-923T9S/R

3. Case of no microwave oscillation

1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 1 does not operate.

2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator in display comes on. *Cause: RELAY 1 does not operate.

3) When touching M/W button, oven lamp turn on and turns on and fan motor does not rotate but cook indicator in display comes on. *Cause: RELAY 5 does not operate.

STATE

RELAY 1 ON

RELAY 1 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

M/W

(KOC-922T9S/R)

D8(KOC-923T9S/R)

Q4(KOC-922T9S/R) Q5(KOC-923T9S/R)

RY1

16(KOC-922T9S/R) 30(KOC-923T9S/R)

STATE

RELAY 4 ON

RELAY 4 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

LAMP TRAY

RY4

D11

(KOC-922T9S/R)

D12

(KOC-923T9S/R)

Q7(KOC-922T9S/R) Q9(KOC-923T9S/R)

23(KOC-922T9S/R) 34(KOC-923T9S/R)

STATE

RELAY 5 ON

RELAY 5 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

FAN

RY5

D15

(KOC-922T9S/R)

D14

(KOC-923T9S/R)

Q8(KOC-922T9S/R) Q10(KOC-923T9S/R)

24(KOC-922T9S/R) 35(KOC-923T9S/R)

4. Case of no heating of top grill

When touching GRILL or COMBI button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 2 does not operate.

5. Case of no heating of convection grill When touching CONVECTION button, oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on. *Cause: RELAY 3 does not operate.

STATE

RELAY 2 ON

RELAY 2 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

TOP

GRILL

RY2

D8(KOC-922T9S/R) D9(KOC-923T9S/R)

Q5(KOC-922T9S/R) Q7(KOC-923T9S/R)

17(KOC-922T9S/R) 32(KOC-923T9S/R)

STATE

RELAY 3 ON

RELAY 3 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

CONV GRILL

RY3

(KOC-922T9S/R)

D10

(KOC-923T9S/R)

Q6(KOC-922T9S/R) Q8(KOC-923T9S/R)

18(KOC-922T9S/R) 36(KOC-923T9S/R)

6. Case of no stopping of the count down timer

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

(KOC-922T9S/R)

(KOC-923T9S/R)

POINT

STATE

DOOR OPEN

DOOR CLOSED

OPEN

+5V DC

GND

CN1

1 2

+5V

R1 C4

D.O.M SW

CN1

2 1

+5V

R3 C1

D.O.M SW

CHECK NO METHOD REMEDY

Check the stage(ON,OFF) of the door open

1 monitor switch by resistance Replace door open monitor swith.

measurement.

13. P.C.B. CIRCUIT DIAGRAM

KOC-922T9S/R

KOC-923T9S/R

NO NAME SYMBOL SPECIFCATION PART CODE Q’TY REMARK

1 BUZZER BZ1 BM-20K 3515600100 1 2 C ARRAY CA1 5P(4) 102 M 50V CN4XB-102M 1 3 C CERA C1~11 104 50V Z AXIAL CCZF1H104Z 11 4 C ELECTRO EC1 50V RS 10uF CEXE1H100A 1 5 C ELECTRO EC3 50V RSS 100uF CEXF1H101V 1 6 C ELECTRO EC2,5 50V RSS 220uF CEXF1H221V 2 7 C ELECTRO EC4 35V RSS 1000uF CEXF1V102V 1 8 CONNECTOR WAFER CN1 35313-0210 30166M7020 1

9 CONNECTOR WAFER CN2 35312-0310 30166M5030 1 10 CONNECTOR FILM CN3 HLEM15S-1 4CW215RBD0 1 11 CONNECTOR WAFER CN4 35328-0610 4CW3061MX0 1 12 DIODE D1~5,7~12,D15,D16 1N4148 DZN4148--- 13 13 DIODE D13,14,17~20 1N4004A DZN4004A-- 6 14 DIODE ZENER ZD1 UZ-3.9BSB DZUZ3R9BSB 1 15 DIODE ZENER ZD2 UZ-5.6BSB DZUZ5R6BSB 1 16 DIODE ZENER ZD3 UZ-24BSB DZUZ24BSB- 1 17 DIODE ZENER ZD4 UZ-3.9BSB DZUZ3R9BSB 1 18 DISPLAY VFD DP1 SVM-5MS06 DSVM5MS06- 1 19 HOLDER VFD PP 3513002000 1 20 PCB MAIN M244 MAIN PCB 3514323530 1 21 R ARRAY RA1 6P(5) 1/8 100K J RA-86X104J 1 22 R CARBON FILM R28 1/2W 27 5% RD-2Z270JS 1 23 R CARBON FILM R22~27 1/2W 200 5% RD-2Z201JS 6 24 R CARBON FILM R20 1/4W 6.8 5% RD-4Z689J- 1 25 R CARBON FILM R5 1/6W 200 5% RD-AZ201J- 1 26 R CARBON FILM R2,6,14,15,19,21 1/6W 1K 5% RD-AZ102J- 6 27 R CARBON FILM R1,4,8 1/6W 10K 5% RD-AZ103J- 3 28 R CARBON FILM R9 1/6W 47K 5% RD-AZ473J- 1 29 R CARBON FILM R7,12,13,16,17,18 1/6W 100K 5% RD-AZ104J- 6 30 R CARBON FILM R3 1/6W 1M 5% RD-AZ105J- 1 31 R CARBON FILM R10 1/4W 10K 1% RN-4Z1002F 1 32 R CARBON FILM R11 1/4W 120K 1% RN-4Z1203F 1 33 RESONATOR CERA CR1 CRT4.00MS 5P4R00MTS- 1 34 IC MICOM IC1 HD404318S 147S924T00 1 35 TRANSISTOR Q1 KTA-1266Y TZTA1266Y- 1 36 TRANSISTOR Q2,Q4~10 KRC-106M TZRC106M-- 8 37 TRANSISTOR Q11 KTC-3198GR TZTC3198GR 1 38 TRANS POWER LVT1 DMR-210FS 5EPV041410 1 39 SW RELAY RY1~3 G5G-1A 1C DC24V 5SC0101122 3 40 SW RELAY RY4~6 CS11-24SH 1C 1P 5SC0101129 3 41 WIRE COPPER J1,3,4,7~10,13,16,17 1/0.52 TIN COATING 85801052GY 10 7.5mm 42 WIRE COPPER J11,12,14,15 1/0.52 TIN COATING 85801052GY 4 10mm 43 WIRE COPPER J5,6 1/0.52 TIN COATING 85801052GY 2 12.5mm 44 WIRE FLAT WF1 15/90 WH C WSJ-159007 1 45 SELECTION JUMPER SJ1 1/0.52 TIN COATING 85801052GY 1

ONLY FOR KOC-922T9R

NO NAME SYMBOL SPECIFCATION PART CODE Q’TY REMARK

1 PCB SUB M245 SUB PCB 3514323630 1

2 CONNECTOR FILM CN101 HLEM15R-1 4CW215RBD0 1

3 SW TACT SW101~108,110,111 KPT-1115AM 5S50101Z93 10

4 SW ROTARY SW109 SDB161PVB17F 5S10109002 1

5 WIRE COPPER J101~102 1/0.52 TIN COATING 85801052GY 2 7.5mm

PCB ASS Y PART LIST

KOC-922T9S/R

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).

NO NAME SYMBOL SPECIFCATION PART CODE Q’TY REMARK

1 BUZZER BZ1 BM-20K 3515600100 1

2 C ARRAY CA1 5P(4) 102 M 50V CN4XB-102M 1

3 C CERA C1~11 104 50V Z AXIAL CCZF1H104Z 11

4 C ELECTRO EC1 50V RS 10uF CEXE1H100A 1

5 C ELECTRO EC3 50V RSS 100uF CEXF1H101V 1

6 C ELECTRO EC2,5 50V RSS 220uF CEXF1H221V 2

7 C ELECTRO EC4 35V RSS 1000uF CEXF1V102V 1

8 CONNECTOR WAFER CN1 35313-0210 30166M7020 1

9 CONNECTOR WAFER CN2 35312-0310 30166M5030 1

10 CONNECTOR FILM CN3 FCZ 254-11 441M367160 1 11 CONNECTOR WAFER CN4 35328-0610 4CW3061MX0 1 12 DIODE D1~5,D7~13,D16 1N4148 DZN4148--- 14 13 DIODE D14,15,D17~D20 1N4004A DZN4004A-- 6 14 DIODE ZENER ZD1 UZ-3.3BSB DZUZ3R3BSB 1 15 DIODE ZENER ZD2 UZ-5.6BSB DZUZ5R6BSB 1 16 DIODE ZENER ZD3 UZ-24BSB DZUZ24BSB- 1 17 DIODE ZENER ZD4 UZ-3.9BSB DZUZ3R9BSB 1 18 DISPLAY VFD DP1 SVM-5MS06 DSVM5MS06- 1 19 HOLDER VFD PP 3513002000 1 20 PCB MAIN M248 MAIN PCB 3514323540 1 21 R ARRAY RA1,RA4 6P(5) 1/8 100K J RA-86X104J 2 22 R ARRAY RA2,RA3 8P(7) 1/8 100K J RA-88X104J 2 23 R CARBON FILM R23 1/2W 27 5% RD-2Z270JS 1 24 R CARBON FILM R17~22 1/2W 200 5% RD-2Z201JS 6 25 R CARBON FILM R24 1/4W 6.8 5% RD-4Z689J- 1 25 R CARBON FILM R9 1/6W 200 5% RD-AZ201J- 1 26 R CARBON FILM R4,8,14,16 1/6W 1K 5% RD-AZ102J- 4 27 R CARBON FILM R3,7,13 1/6W 10K 5% RD-AZ103J- 3 28 R CARBON FILM R12 1/6W 47K 5% RD-AZ473J- 1 29 R CARBON FILM R1,2,10,15 1/6W 100K 5% RD-AZ104J- 4 30 R CARBON FILM R11 1/6W 1M 5% RD-AZ105J- 1 31 R CARBON FILM R5 1/4W 10K 1% RN-4Z1002F 1 32 R CARBON FILM R6 1/4W 120K 1% RN-4Z1203F 1 33 RESONATOR CERA CR1 CRT4.00MS 5P4R00MTS- 1 34 IC MICOM IC1 GMS81C2020A 150G2020A- 1 35 TRANSISTOR Q2 KTA-1266Y TZTA1266Y- 1 36 TRANSISTOR Q1,Q5~11 KRC-106M TZRC106M-- 8 37 TRANSISTOR Q4 KTC-3198GR TZTC3198GR 1 38 TRANS POWER LVT1 DMR-210FS 5EPV041410 1 39 SW RELAY RY1~3 G5G-1A 1C DC24V 5SC0101124 3 40 SW RELAY RY4~6 CS11-24SH 1C 1P 5SC0101129 3 41 WIRE COPPER J2,6,8,9,11,13 1/0.52 TIN COATING 85801052GY 6 7.5mm 42 WIRE COPPER J3,4,5,10,12,14 1/0.52 TIN COATING 85801052GY 6 10mm 43 WIRE COPPER J1,7 1/0.52 TIN COATING 85801052GY 1 15mm 44 SELECTION JUMPER SJ1 1/0.53 TIN COATING 85801053GY 1

ONLY FOR KOC-923T9R

KOC-923T9S/R

✔ Caution

S/M NO. : C922T9S001

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: Oct. 2003

Daewoo KOC-922T, KOC-923T Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual