Daewoo KOC-870T0S, KOC-873T, KOC-870T5S, KOC-873T0S, KOC-873T5S Service Manual

Service Manual

Microwave Oven

Model: KOC-870T0S

KOC-870T5S

KOC-873T0S

KOC-873T5S

DAEWOO ELECTRONICS CO., LTD.

S/M No. : C870T0S004

http : //svc.dwe.co.kr Aug. 2002

✔

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).

1

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 micro-

wave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

(c) Before turning on microwave power for any service test or inspection within the microwave generating com-

partments, 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

PROPER USE AND SERVICE PRECAUTIONS .......................................................................................................................2

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

NAMES AND FUNCTION OF PARTS........................................................................................................................................4

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

OPERATION................................................................................................................................................................................7

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS.............................................................................................8

PRECAUTIONS FOR DISASSEMBLY AND REPAIR.............................................................................................................10

DISASSEMBLY AND ASSEMBLY............................................................................................................................................11

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

MEASUREMENT ......................................................................................................................................................................27

COMPONENT TEST PROCEDURE........................................................................................................................................29

WIRING DIAGRAM...................................................................................................................................................................30

SCHEMATIC DIAGRAM...........................................................................................................................................................31

EXPLODED VIEWS AND PARTS LIST ...................................................................................................................................34

PRINTED WIRING BOARD (KOC-870T) ................................................................................................................................37

P.C.B. CIRCUIT DIAGRAM (KOC-870T) .................................................................................................................................44

P.C.B. LOCATION NO (KOC-870T) ........................................................................................................................................45

PRINTED WIRING BOARD (KOC-873T) ................................................................................................................................47

P.C.B. CIRCUIT DIAGRAM (KOC-873T) .................................................................................................................................54

P.C.B. LOCATION NO (KOC-873T) ........................................................................................................................................55

2

PROPER USE AND SERVICE 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) This microwave oven weight 19kg (38.9 lbs.) and must be placed on a horizontal base strong enough to support this weight.

2) The oven should be placed as far from high temperature source and vapour as possible.

3) The power supply cord is about 1.1m (3.6ft) long. Earthing is required when connecting the power source.

4) Maximum power consumption of this oven is approximately 2.6Kw(230V). It is suggested that the unit is operated on such power line (about 13 amperes) that can provide more power than this rating.

5) Object must not be placed on the top enclosure so as not to obstruct air flow for ventilation.

The wires 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 the the terminal in the plug which is marked with the letter ‘E’ or by earth symbol or green-and-yellow. The wire which is coloured blue must be connected to the 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.

WARNING : This appliance must be earthed.

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

IMPORTANT

3

MODEL KOC-870T0S/873T0S KOC-870T5S/873T5S POWER SUPPLY 230V ~ , 50Hz 240V~, 50Hz 230V~, 50Hz MICROWAVE POWER CONSUMPTION 1,550 W 1,550 W 1,550 W

OUTPUT POWER 900 W (IEC 705) 900W(IEC 706) 900 W (IEC 705)

FREQUENCY 2,450 MHZ 2,450MHz 2,450MHz GRILL POWER CONSUMPTION 1,150 W 1,200 W 1,150 W CONVECTION POWER CONSUMPTION 1,550 W 1,600 W 1,550 W AUTO COOK POWER CONSUMPTION 2,600 W 2,650 W 1,550 W OUTSIDE DIMENSIONS (W X D X H ) 501 X 398 X 320 mm (19.7 X 15.7 X 12.6 in.) CAVITY DIMENSIONS (W X D X H) 310 X 310 X 229 mm (12.2 X 12.6 X 9.0 in.) NET WEIGHT 19 kg (38.9 Ibs.) TIMER 60 minutes SELECT FUNCTION Microwave/Grill /Convection /Combination MICROWAVE POWER LEVEL 10 stages

* Specifications subject to change without notice.

332

294

320

501

210 402

Grill

M/W

Combi +1 min

Pie Temp +10 sec

GRILL COMBI

WEIGHT

DEFROST

TIME

AUTO COOK

PIE TEMP

COOK

kg

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/ CLEAR

START

Fig. 1 Front View Fig. 2 Side View

SPECIFICATIONS

EXTERNAL VIEWS

4

3 5 64

2

1 9 8

8

10

7

11

Grill

M/W

Combi +1 min

Pie Temp +10 sec

GRILL COMBI

WEIGHT

DEFROST

TIME

AUTO COOK

PIE TEMP

COOK

kg

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/

CLEAR

START

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

GRILL HEATER - Turns on when grill and simultaneous cooking is selected.

5

OVEN LAMP - Automatically turns on during oven operating.

6

SAFETY INTERLOCK SYSTEM

7

CONTROL PANEL

8

TURNTABLE TRAY - Rotates during cooking and

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

9

OVEN FRONT PLATE

0

ROTATING BASE -

This fits over the shaft in the center of the oven’s cavity floor. This is to remain in the oven for all cooking. It should only be removed for cleaning.

q

UNDER HEATER

NAMES AND FUNCTION OF PAR TS

5

CONTROL PANEL

When blinking, the oven is operating in COMBI cooking.

When blinking, the oven is operating in WEIGHT DEFROST. When blinking, the oven is operating in TIME DEFROST.

When blinking, the oven is operating in weight input mode.

Cooking time is increased by 1 minute.

Cooking time is increased by 10 seconds.

FUNCTION BUTTON Used to select desired oven operation.;Grill, Combi, Pie Temp, Auto Cook, M/W, Defrost.

Stop/Clear Button-Used to select desired oven operation.;Grill, Combi, Pie Temp, Auto Cook, M/W,Defrost.

Start Button-Used to start the selectee cycle.

Speedy Cook ButtonUsed to set desired time. (Time increases by 30 seconds from 30 seconds to 5 minutes.)

Guide LampWhen blinking, it informs you to be ready to operate dial knob.

Dial KnobUsed to set the cooking time, time of day and weight input.

When blinking, the oven is operating in GRILL

When blinking, the onve is operating in MICROWAVE COOK

When blinking, the oven is operating in AUTO COOK.

When blinking, the oven is operating in PIE COOK.

Microwave Button-Used to select the variable microwave power level. If this button is pressed for more than 1.3 seconds, number is scrolled up automatically.

Temp Button Used to set desired temperature. If this button pressed for more than

1.3 seconds, number is scrolled up automatically.

Clock Button-Used to set time.

When blinking, the oven is operating in CONVECTION (TEMP COOK)

Grill

M/W

Combi +1 min

Pie Temp +10 sec

GRILL COMBI

WEIGHT

DEFROST

TIME

AUTO COOK

PIE TEMP

COOK

Kg

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/

CLEAR

START

KOC-870T

6

CONTROL PANEL

KOC-873T

Defrost +1min

Auto

Cook

Temp Cook

Pie Kg

MW CombiGrill Weight

Defrost

Time

+10sec

KOC-873T0S

Clock Pie

MW

Grill Combi

TIME WEIGHT/QUANTITY

STOP/CLEAR

START/SPEEDY COOK

Auto Cook Menu

1. Roast beef

2. Roast pork

3. Roast chicken

4. Fish Fillet

5. Vegetable

Auto

Cook

Temp

When blinking, the oven is operating in “Combi” cooking mode. When blinking, the oven is operating in “Grill” cooking mode.

When blinking, the oven is operating in “Microwave” cooking mode.

When blinking, the oven is operating in “Auto Cook” cooking mode.

When blinking, the oven is operating in “Pie” cooking mode.

Temp Button -Used to set desired temperature. If this button pressed for more than 1.3 seconds, number is scrolled up automatically.

Clock Button - Used to set time.

Microwave Button -

Used to select the variable microwave power level. If this button is pressed for more than 1.3 seconds, number is scrolled up automatically.

Dial Knob- Used to input the cooking time and quantity.

STOP/CLEAR Button - Used to pause and clear all information manually put into the oven.

When blinking, the oven is operating in “Weight Defrost” cooking mode. When blinking, the oven is operating in “Time Defrost” cooking mode.

When blinking, the oven is operating in weight input mode.

When blinking, the oven is operating in “Convection” cooking mode.

Cooking time is increased by 1 minute.

Cooking time is increased by 10 seconds.

FUNCTION BUTTON-Used to select desired oven operation. ;Grill, Combi, Pie, Temp, Auto Cook, MW, Defrost.

START Button - Used to start the selected cycle.

SPEEDY COOK Button -

Used to program quickly cooking time in 30 seconds increments. (Time increases by 30 seconds from 30 seconds to 5 minutes.)

7

TO STOP THE OVEN WHILE THE OVEN IS OPERATING

1. Press (STOP / CLEAR) button.

- The (STOP) indicator starts blinking.

- You can restart the oven by touching (START) button.

- Touch once more to erase all instruction except clock.

2. Open the door

- You can restart the oven by closing the door and touching button.

ERASING INSTRUCTIONS

• Touch (STOP/CLEAR) button to erase all instructions you set previously.

• Opening the oven door during cooking dose not erase cooking instruction.

• If you touch button during operation, the cooking instructions is all erased.

OPERATION

NOTE : Oven stops operating when door open.

8

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 lever downward. The lever press the button of the primary interlock switch to bring it under ‘ON’ condition.

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS

Mounting screw

Upper Hook

Primary interlock switch

9

(2) Monitor interlock switch

When the door is closed, the hook pushes the lever forward, and pushes the Latch Lever downward the lever press the button of the interlock monitor switch to bring it under ‘OFF’ condition. The latch Lever press the button on the secondary interlock switch to bring it under ‘ON’ condition.

- Adjustment

Interlock monitor switch

When the door is closed, the monitor switch should be opened before other switches close. When the door is opened, the monitor switch should be closed after other switches open.

Adjustment steps :

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

10

PRECA UTIONS FOR DISASSEMBLY AND REPAIR

-

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 war rubber gloves when servicing the high voltage side.

(3)Warning about the electric charge in the high voltage capacitor. When inspecting and repairing the high voltage side,

always short the capacitor terminals and make sure of discharge.

1. Check the earthing.

Do not operate on a 2-wire extension cord. The microwave oven is designed to be used when earthed. It is imperative, therefore, to makes sure it is earthed properly before beginning repair work.

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

For about 30 seconds after the operation stops, 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 screw driver to discharge.

(4) When the 15Amp fuse(870T5S: 12Amp) is blown out due to the operation of the monitor switch; replace secondary

interlock switch and monitor switch. Refer to 17 page for the necessary adjustment.

(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 repairing the magnetron.

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

electrical shock or exposing microwave. These parts are as follows - H.V. Transformer, magnetron, H.V. Diode, H.V. Capacitor.

11

1. T o remo ve cabinet. (Refer to Fig. 1)

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. T o remo ve guide wind assembl y. (Refer to Fig. 2)

1) Release two screws ②.

2) Remove back-cover ③.

3) Pull the fan ⑤ to the motor shaft.

4) Release two screws ① which secure the motor shaded pole ④.

5) Reverse the above steps for reassembly.

DISASSEMBLY AND ASSEMBLY

Fig. 1

Fig. 2

54 3

21

12

3. T o remo ve H.V. transformer. (Refer to Fig. 3)

1) Remove four screws 1 which secure the

H.V. Transformer bracket to the base plate.

2) Remove the H.V. Transformer 2.

High voltage circuit wiring

2

1

H.V. Trans

H.V. Copacitor

Mognetron

H.V.Diode

H.V.Fuse

13

4. T o remo ve magnetr on. (Ref er to Fig. 4)

1) Remove one screws ② which secure the magnetron ① .

2) Remove the magnetron.

3) Reverse the above steps for reassembly.

Fig. 4

12

14

5. To remove control panel assembl y. (Refer to Fig. 5, 6)

(1) Remove a screw holding control panel assembly to the oven

front plate. At the same time, draw forward the control panel assembly

from oven front plate. (2) Remove the Dial knob ⑪ (3) Remove nine screws ⑪ which secure the main and sub

PCB assembly ⑧

,⑨ to control panel ③. (4) Remove buttons ④,⑤,⑥,⑦. (5) Remove the Window display ②, and Decorator Panel ①.

Fig. 5

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

2

for a fully assembled oven with door normally closed.

Wave guide

Magnetron antenna

Metallic gasket plate

Magnetron antenna

Metallic gasket plate

Cooling fin

Filament terminal

15

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

1 3511602500 DECORATOR C-PANEL ABS 1

KOC-870T(ONLY)

2 3515501300 WINDOW DISPLAY PMMA 1

KOC-870T0S

3515501320 WINDOW DISPLAY PMMA 1

KOC-873T0S

3 3516716310 CONTROL-PANEL ABS 1

KOC-870T0S

3516716370 CONTROL-PANEL ABS 1

KOC-873T0S

4 3516906000 BUTTON FUNCTION(A) ABS 1

KOC-870T0S

3516909900 BUTTON FUNCTION(A) ABS 1

KOC-873T0S

5 3516905900 BUTTON FUNCTION(B) ABS 1

KOC-870T0S

3516909910 BUTTON FUNCTION(B) ABS 1

KOC-873T0S

6 3516905800 BUTTON FUNCTION(C) ABS 1

KOC-870T0S

3516909920 BUTTON FUNCTION(C) ABS 1

KOC-873T0S

7 3516906100 BUTTON FUNCTION(D) ABS 1

KOC-870T0S

3516909930 BUTTON FUNCTION(D) ABS 1

KOC-873T0S

8 PKBPMSQ200 PCB SUB ASS’Y KOC-970T1S 1

KOC-870T0S

PKBPM00000 PCB SUB ASS’Y KOC-873T0S 1

KOC-873T0S

9 PKMPMSP700 PCB MAIN ASS’Y KOC-870T0S 1

KOC-870T0S

PKMPMSP720 PCB MAIN ASS’Y KOC-870T5S 1

KOC-870T5S

PKMPM00000 PCB MAIN ASS’Y KOC-873T0S 1

KOC-873T0S

10 7121030811 SCREW TAPPING T2S PAN 3X8 MFZN 9

KOC-870T0S

7121030811 SCREW TAPPING T2S PAN 3X8 MFZN 7

KOC-873T0S

7122401211 SCREW TAPPING T2S PAN 4X12 MFZN 4

KOC-873T0S

11 3513403810 KNOB VOLUME ABS 1

KOC-870T0S

3513406600 KNOB VOLUME ABS 1

KOC-873T0S

Fig. 6

✔ 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)

16

6. To remove door assembly. (Refer to Fig. 7)

1) Remove two screws 1 which secure to hinge.

2) Remove door assembly 2.

3) Remove door above for reassembly taking case to

replace fixing glue.

7. To remove door part. (Refer to Fig. 8)

(1) Remove the Gasket door 7. (2) Remove the Door seal Ass’y 5. (3) Remove the Hook 8 and Spring 9. (4) Remove the Supporter barri-s *0 3. (5) Remove the Barrier Screen 2. (6) Remove the Handle 0 from the Frame door 3.

2

1

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

1 3512203520 FRAME DOOR ABS XR-401 1 KOC-870T0S

3512205400 FRAME DOOR PC LUPOY GP-1000 1 KOC-873T0S

2 3517004510 BARRIER-SCREEN*O GLASS 3.2T 1 KOC-870T0S

3517007710 BARRIER-SCREEN*O GLASS 3.2T 1 KOC-873T0S

3 3515305300 SUPPORTER BARRI-S*O PBT 1

KOC-870T(ONLY) 4 3515203600 STOPPER HINGE*T AS KOC-970T1S 1 5 3511709000 DOOR SEAL AS KOC-871C0S 1 6 3517004400 BARRIER-SCREEN*I GLASS 3.0T 1 7 3512301300 GASKET DOOR PBT 1 8 3513101300 HOOK POM 1 9 3515101300 SPRING HOOK PW1 1

10 3512601500 HANDLE DOOR ABS XR-401 1

KOC-870T(ONLY)

11 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2

KOC-870T(ONLY)

Fig. 7

Fig. 8

8

9

0 q

1 2 3 4 5 6 7

✔ 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)

17

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

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

1) Remove the cabinet.

2) Loosen a screw on top door hinge, then push the door to contact the door seal to oven front surface.

3) Tighten a screw.

(2) To reduce gap located on part ‘B’.

1) Loosen a screw on bottom hinge, then push the door to contact the door seal to oven front surface.

2) Tighten a screw.

(3) To reduce gap located on part ‘C’.

1) Remove the cabinet.

2) Loosen a screw on interlock switch assembly located bottom of oven body.

3) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom.

4) Tighten a screw.

(4) To reduce gap located on part ‘D’.

1) Remove the cabinet.

2) Loosen a screw on interlock switch assembly located top of oven body.

3) and 4) are same as step (3).

A D

B C

Grill Combi +1 min

Pie Temp +10 sec

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/ CLEAR

START

NOTE : Small gap may be acceptable if the microwave leakage does not exceed 1mW/cm2.

NOTE : The door on a microwave oven is designed to act as an electronic seal preventing the leakage of microwave

energy from the oven cavity during the cook cycle. This function does not require that the door be air-tight, moisture (condensation) - Tight or light-tight. Therefore, the occasional appearance of moisture, light or the sensing of gentle warm air movement around the oven door is not abnormal and do not of themselves, indicate a leakage of microwave energy from the oven cavity. If such were the case, your oven could not be equipped with a vent, the very purpose of which is to exhaust the vapor-laden air from the oven cavity.

18

9. To remove tray motor and under Heater. (Refer to Fig. 9)

1) Cut the tray motor cover parts from the base plate (Refer to Fig. 9).

2) Remove two screws 7 which secure the tray motor 6 and supporter to tray motor bracket 4 .

3) Remove three screws 1 and under heater assembly 2 in cavity.

1

2

3

4

5

6

7

CUTTING(5EA)

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Fig. 9

19

10. To remove grill heater assembly. (Refer to Fig. 10)

1) Remove the cabinet.

2) Release two screws 1 , and remove the Top cover 2.

3) Release a screws 3 , and remove Air Guide outlet 4.

4) Release the above steps for reassembly.

Fig. 10

3

4

2

1

20

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

TROUBLE SHOO TING GUIDE

Condition Check Result Cause Remedy

Fuse blows

Check continuity of interlock monitor switch with door closed (COM↔NC)

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

Check continuity of primary winding of low voltage transformer

Disconnect high voltage fuse and operate the unit

Continuity

No

Continuity

0 Ω or infinite

Fuse again blows

Approx.

150~210

(normal)

Replace

(COM↔NC)

Note 1.

(COM↔NC)

Malfunction of interlock monitor switch

No

Continuity

Malfunction of interlock switch

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

Replace

Note 1.

Shorted contacts of primary interlock switch.

Defective low voltage transformer

Defective high voltage transformer

Following the procedure below to chec k if the o ven is def ective or not.

1. Check earthing before trouble checking.

2. Be careful of the high voltage circuit.

3. Discharge the high voltage capacitor.

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

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

Check wire harness, wiring, and connected of the terminals, and power cord before check the parts listed below.

21

(TROUBLE 2) Grill Heater (Top heater) does not heat (Food will not become hot).

Condition Check Result Cause Remedy

Replace

Outlet has proper voltage. Fuse does not blow.

Check continuitymagnetron

No Continuity

Defective magnetron

Replace

Check continuity of noise filter board

No Continuity

Defective line filter board

Condition Check Result Cause Remedy

Adjust or replace

Grill heater is not heated

Check continuity of primary interlock switch

No Continuity

Malfunction of Primary Interlock Switch

Adjust or replace

Check continuity of secondary interlock switch

No Continuity

Malfunction of secondary interlock switch

Replace

Check continuity of heater

No Continuity

Defective heater

Replace

Check D.C. voltage being supplied to RELAY (RY2) coil

0V

Defective touch control circuit

Replace

Approx. 13VDC

Faulty contacts of RELAY (RY2) or open relay coil

Adjust.

No Continuity

Normal

Open power supply cord

Adjust.

Check continuity of power supply cord

Defective touch control circuit

NOTE1 : All these switches must be replaced at the same time, please refer to page 17 for adjustment instructions

22

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

Condition Check Result Cause

Defective high voltage transformer

Remedy

No microwave oscillation

Check continuity of high voltage fuse

Check continuity of high voltage capacitor terminals with wires removed

Continuity

Replace

Replace high voltage fuse

Defective high voltage rectifier

Check continuity of high voltage rectifier in forward and backward direction with DC megger

Continuity in backward direction

Replace

Defective magnetron

Connect megger leads to magnetron terminal and magnetron body

Continuity

Replace

Defective high voltage transformer

Check resistance of primary and secondary coil of high voltage transformer

0 Ω or ∞

Replace

Defective magnetron

Check continuity of magnetron with wires removed

No Continuity

Replace

Defective high voltage transformer

Check continuity of filament terminal of high voltage transformer

No Continuity

Replace

Defective timer ass’y

Check continuity of microwave select switch

Replace

Defective touch control circuit

Check D.C. voltage being supplied to RELAY (RY3) coil

0V

Replace

Faulty contacts or RELAY (RY3) or open relay coil

Approx. 13VDC

Replace

No Continuity

23

(TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired program

and time are set and start pad is tapped.

(TROUBLE 5) Under Heater does not heat (Food will not become hot).

Condition Check Result Cause Remedy

Adjust or replace

Replace

Turn table motor, and oven lamp do not turn on

Check continuity of primary interlock switch

Check continuity of secondary interlock and D.O.M. switch

No Continuity

0V

Approx. 13VDC

Check D.C. voltage being supplied to RELAY (4) coil.

No Continuity

Malfunction of Primary interlock switch

Malfunction of secondary interlock and D.O.M. switch

Defective touch control circuit

Faulty contacts of RELAY (4) or open relay coil

Condition Check Result Cause Remedy

Adjust or replace

Replace

Under heater is not heated

Check continuity of primary interlock switch

Check continuity of secondary interlock switch

Check continuity of heater

Check D.C. voltage being supplied to RELAY (RY6) coil

No Continuity

0V

Approx. 13VDC

Malfunction of Primary interlock switch

Malfunction of secondary interlock switch

Defective Heater

Defective touch control circuit

Faulty contacts of RELAY (RY6) or open relay coil

24

11. Incomplete segments,

(A) Segments missing. (B) Partical segments missing. (C) Digit flickering other than normal fluorescent slight

flickering.

(D) “0” does not display when power is on.

12. A distinct change in the brightness of one or more

numbers is the display.

13. One or more digits in the display are not on when they

should be.

14. Display indicates a number different from one touched.

15. Specific numbers (for example 2 or 3) will not display

when the panel is touched.

16. Display does not count down or up with time cooking or

clock operation.

17. Oven is programable and cooks normally but no display

shows.

18. Display obviously jumps in time while counting down.

19. 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 "4" contacts close if they are close, replace touch control circuit.

M/W GRILL COMBI WEIGHT TIME

DEFROST

AUTO

PIE TEMP kg

COOK COOK

NOTE1 : Before following the particular steps listed above in the trouble shooting guide for the button keyboard's,

failure, please check for the continuity of each wire-harness between the button keyboard and P.C.B. assembly.

(TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or membrance

switch assembly

Condition Check Result Cause Remedy

Replace control box subassembly

Replace the button keyboard

Display does not show programming at all, even if keyboard is touched.

Check each button for continuity of the button keyboard for the following keyboard check procedure

Normal

Abnormal

Malfunction of touch control circuitry of control box sub-assembly

Malfunction of the button keyboard

25

1. Type of encoding and button names.

Fig. 11 Key Matrix and circuit diagram

The button keyboard consists of 12 keys whose configurations are described above and provides 8 pad terminations to be connected to the touch control circuit as in Fig. 11.

2. Key check procedure.

To determine if the button keyboard is defective or not, check the continuity of each button (Key) contacts with a multimeter.

2 4

6 8

10 12 14

5 6 7

53 52

51

50

RA3 RGLD7X104J CA1 B7102M

SW101 GRILL

SW107 AUTO COOK

SW103 +min

SW106 +10sec

SW109 STOP/ CLEAR

SW108 START

SW102 COMBI

SW105 TEMP

SW104 PIE

SW111 DEFROST

SW110 M/W

SW112 CLOCK

1) AUTO COOK button : Between 4 and 10

2) DEFROST button : Between 4 and 14

3) ˚C, TEMP button : Between 8 and 12

4) MICROWAVE button : Between 6 and 14

5) COMBI button : Between 6 and 12

6) GRILL button : Between 2 and 10

7) +10 SEC button : Between 8 and 10

8) +1 MIN button : Between 6 and 10

9) STOP/CLEAR button : Between 2 and 12

10) START button : Between 4 and 12

11) CLOCK button : Between 8 and 14

12) PIE button : Between 2 and 14

BUTTON KEYBOARD CHECK PROCEDURE (KOR-870T)

26

1. Type of encoding and button names.

Fig. 11 Key Matrix and circuit diagram

The button keyboard consists of 12 keys whose configurations are described above and provides 8 pad terminations to be connected to the touch control circuit as in Fig. 11.

2. Key check procedure.

To determine if the button keyboard is defective or not, check the continuity of each button (Key) contacts with a multimeter.

2 4

6 8

10 12 14

5 6 7

53 52

51

50

RA3 RGLD7X104J CA1 B7102M

GRILL

AUTO COOK

+1min

+10sec

STOP/ CLEAR

START

COMBI

TEMP

PIE

DEFROST

M/W

CLOCK

1) AUTO COOK button : Between 4 and 10

2) DEFROST button : Between 4 and 14

3) ˚C, TEMP button : Between 8 and 12

4) MICROWAVE button : Between 6 and 14

5) COMBI button : Between 6 and 12

6) GRILL button : Between 2 and 10

7) +10 SEC button : Between 8 and 10

8) +1 MIN button : Between 6 and 10

9) STOP/CLEAR button : Between 2 and 12

10) START button : Between 4 and 12

11) CLOCK button : Between 8 and 14

12) PIE button : Between 2 and 14

BUTTON KEYBOARD CHECK PROCEDURE (KOR-873T)

27

1. Microwave Output Power

1-1. Standard Method

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.

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 1,000 ± 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 prior to the start of the test. The initial temperature of the water is 10±2˚C (50±3.6˚F) It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf which is in the lowest normal position. (fig. 12).

4) Microwave power is switched on.

5) Heating time should be exactly 46 seconds. Heating time is measured while the microwave generator is operating at full power.

6) The initial and final water temperatures are selected so that the maximum difference between the ambient and final water temperatures is 5K.

7) The microwave power output P in watts is calculated from the following formula :

• △T is actual temperature rise.

• t is the heating time.

The power measured should be 900W±10%

2. Electrical Continuity Check of Interlock Switch

2-1. Procedure

1) Primary Interlock Switch

1) Disconnect two connector from Primary Interlock Switch.

2) Connect the ohm-meter leads between the terminals of the primary interlock switch.

3) Read the value of resistance between the terminals of the switch, when the door is opened, and when the switch, when the door is opened, and when the door is closed.

2) Secondary Interlock Switch

1) Disconnect two connector from secondary interlock switch.

2) Connect the ohm-meter leads between the terminals of the secondary interlock switch.

3) Read the value of resistance between the terminals of the switch, when the door is opened, and when the oven door is closed.

3) Interlock Monitor Switc h

1) Disconnect the lead wire connecting the primary interlock switch and interlock monitor switch from primary interlock switch terminal.

2) Connect the ohm-metor leads between the lead wire connector disconnected as item '1' and the power supply natural plug pin.

3) Read the value of resistance between the lead wire connector and the power supply natural plug pin, when the oven door is opened, and when the oven door is closed.

P=4187 x△T/t

CAUTION :

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

2. Input power voltage should be exactly volts as

specified.

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

±3.6˚F)

NOTE : Remove the power plug from the wall

receptacle before testing.

MEASUREMENT

Fig. 12

Tray

Fig. 16

Water Load

28

2-2. Judgement

The value of resistance should be applied to the value specified below.

3. Microwave Leakage Test

3-1. Warning

1) DO NOT place your hands into any suspected microwave leakage field unless the safe density level is known.

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

3) Slowly approach the unit under test until the radiometer reads and appreciable leakage from the unit under test.

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

3-2. Method

The power density of the microwave leakage emitted by the microwave oven should not exceed 1mW/cm

2

at any point 50mm (2 in). or more away from the external surface of the oven as measured prior to acquisition by a purchaser and there after once the oven is in use, 4mW/cm

2

at any point 50mm (2 in) or more away from the external surface of the oven, checks to be made around the whole of the door seal and on each of the main unit surface. Measurements should be made with the oven operating at its maximum output and containing a load of 275 ±15 milliliters of tap water initially at 68±9˚F(20±5˚C) placed within the cavity at he center of the load carrying surface provided by the manufacture. The water container should be a low from 600 milli-liters beaker having an inside diameter of approximately 85mm (3-11/32 in.) and made of an electrically nonconductive material such as glass or plastic.

3-3. Procedures

1) Prepare 600cc glass or plastic container.

2) Pour 275 ± 15 milliliters of tap water initially at 68 ± 9˚F (20 ± 5˚C) in the container.

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

4) Operate oven.

5) Measure the microwave leakage using a Narda 8100 or similarly approved microwave leakage meter after a few minutes operation.

Door Open Closed

Primary Interlock Switch ∞ 0 Secondary Interlock Switch ∞ 0 Interlock Monitor Circuit 0 ∞

NOTE : The scan rate should not exceed 1 inch/sec.

Fig. 13

Grill Combi +1 min

Pie Temp +10 sec

1. Roast Beef

2. Roast Pork

3. Roast Chicken

4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/ CLEAR

START

29

1. High voltage is present at the high voltage terminal of the high voltage transformer during any cook cycle.

2. It is neither necessary nor advisable to attempt measurement of the high voltage.

3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 20).

1. High voltage transformer

(A) Remove connections from the transformer terminals and

check continuity.

(B) Normal readings should be as follows:

Secondary winding..........................Approx. 100Ω ±10%

Filament winding............................................Approx. 0Ω

Primary winding .............................................Approx. 0Ω

2. High voltage capacitor

A) Check continuity of capacitor with meter on the highest

ohm scale.

(B) A normal capacitor will show continuity for a short time,

and then indicate 9MΩ once the capacitor is charged. (C)A shorted capacitor will show continuous continuity. (D)An open capacitor will show constant 9MΩ. (E) Resistance between each terminal and chassis should

be infinite.

3. High voltage diode

The high voltage diode is located on the base near the

transformer. (A) Isolate the diode from the circuit by disconnecting the

leads. (B) 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-to-back

resistance may be read in both directions. A normal

diodes 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 Output Power". Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron.

(A) Isolate magnetron from the circuit by disconnecting the

leads.

(B) A continuity check across magnetron filament terminals

should indicate one ohm or less.

(C) A continuity check between each filament terminal and

magnetron case should read open.

Secondary terminal

Primary terminal

Filament terminal

COMPONENT TEST PROCEDURE

Magnetron antenna

Filament terminal

Magnetron chassis ground

Metallic gasket plate

WIRING DIAGRAM

30

31

SCHEMATIC DIAGRAM

32

33

34

EXPLODED VIEWS AND PARTS LIST

35

NO NAME SPECIFICATION PART CODE Q'TY

1 CAVITY AS KOC-870T0S 3516108630 1 2 REAR-PLATE *0 SBHG-1 T0.6 3516503900 1 3 DOOR AS KOC-870T0S 3511708840 1

KOC-873T0S 3511708890 1

4 CONTROL-PANEL AS KOC-870T0S PCKPSWP700 1

KOC-870T5S PKCPSWP720 1

KOC-873T0S PKCPSWVH00 1 5 COVER WAVE GUIDE MICA TO.5 3511403800 1 6 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 1 7 BRACKET MOTOR SYNCRO SBHG-1 TO.8 3510604700 1 8 COUPLER TEFLON 3517401400 1 9 MOTOR SYNCHRO 230V 25W GM-16-24FD16 3966510200 1

10 SCREW TAPPING T2S PAN 4X8 MFZN 7121400811 2 11 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 1 12 HEATER *U AS KOC-971C0S 3512802100 1 13 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 3 14 BASE SBHG T0.8 3510311000 1 15 STOPPER HINGE *U AS KOR-121M0A 3515202800 1 16 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 7S422X4081 2 17 FOOT PP, DASF-310 3512101400 4 18 CAPACITOR HV 2100VAC, 1.1µF 4416W67820 1 19 HOLDER HV CAPACITOR SECC T0.8 441X304112 1 20 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 7S422X4081 1 21 DIODE HV SANKEN HVR-1X-32B(D5.3) 4416V24000 1 22 NOISE FILTER DWLF-M05(KOC-870T0S) 3518605301 1

DWLF-M07(KOC-870T5S) 3518605500 1

23 FUSE HV 5KV 0.7A THV 060T 3518700200 1 24 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 7S422X4081 1 25 CLAMP WIRE SBHG 3511200400 1 26 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 1 27 TRANS HV DY-N90S0-87T 3518111000 1 28 SCREW SPECIAL TT2 HEX FG 4X10 SE MFZN 7S427W40A1 4 29 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 5 30 LOCK POM 3513805710 1 31 LAMP BL 240V25W T25 C7A H187 3513601600 1 32 SW MICRO SZM-V16-FA-63 5S762S10G0 2 33 SW MICRO SZM-V16-FA-61 5S762310G0 1 34 LEVER LOCK POM 3513701300 1 35 SCREW SPECIAL T2S PAN 4X12 PW SE MFZN 7S341W40B1 2 36 SCREW SPECIAL T2S PAN 4X12 PW SE MFZN 7S341W40B1 1 37 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 1 38 COVER INSULATOR *T SECC T0.5 3511405000 1 39 HEATER *T 115V 550W QUARTZ 3512803000 2

✔ 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)

36

NO NAME SPECIFICATION PART CODE Q'TY

40 PROTECTOR WIRE STS430 3517502700 2 41 PROTECTOR HEATER MICA T1.0 3517502700 2 42 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 2 43 MAGNETRON 2M218H(MF) I 3518002200 1 44 SCREW SPECIAL T2 FLANGE 5X8 MFZN 7S327W5081 1 45 FAN PP GF20 3511800100 1 46 COVER *B SBHG T0.8 3511402500 1 47 MOTOR SHADED POLE 230V17W MW15CA-K02 3963513900 1 48 SCREW TAPPING T2S PAN 4X8 MFZN 7121400811 2 49 SCREW TAPPING PAN FLANGE 4X8 MFZN 7S101W4081 2 50 GUIDE AIR OUTLET SA1D T0.5 3512515500 1 51 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 1 52 SCREW SPECIAL TT2 HEX FG 4X10 SE MFZN 7S427W40A1 2 53 SENSOR TEMPERATURE PTM-K312-D4 3514800800 1 54 SCREW TAPPING T1 BIN 4X8 MFNI 7113400814 1 55 CORD POWER AS 3X1.5 40X40 120-TML 35113ACSJ5 1

3X1.0 40X40 120-TML 35113BCSM5 1 56 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 7S422X4081 1 57 THERMOSTAT 100/90 3518905000 1 58 SCREW TAPPING T2S PAN 3X8 7121300811 1 59 CABINET PCM T0.6 3510800800 1 60 SCREW SPECIAL T1 TRS 4X10 SE MFZN 7S312X40A1 3 61 GUIDE TRAY AS KOC-871C0S 3512516100 1 62 TRAY METAL SPP T0.6 3517205600 1

✔ 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)

37

PRINTED WIRING BO ARD

1.CIRCUIT CHECK PROCEDURE (K OC-870T)

1) Low voltage transformer (DMR-101FS) chec k.

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

2) V oltage Chec k

KMICOM PIN>

DISPLAY PIN

CHECK METHOD

Terminal

1-2 4-5 6-7

8-10

Voltage

230.0V

13.0V

35.0V

3.0V

14

5 6

7 8

10

2

NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power

source voltage.

NOTE 2 : The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.

NO. CHECK POINT REMARK

1 PIN 63, 64 0V 2 PIN 29, 32, 62 -5VDC ±5% 3 PIN 45

4 PIN 30, 31

NO. MEASURE POINT WAVE FORM REMARK

1 MP 1 -5V DC Replace R24, J3, Q10 2 MP 2 -12V DC Replace D1~D6, J8 3 MP 3 -27V DC Replace R28, R29, ZD4

NOTE :

Each measure point must be measured with GND points.

T=0.25us (4.0MHz)

PIN 1 & 25 2.6VAC (Display filament voltage)

0V

-5V

5V

0V

T: 20 ms (50 Hz)

T

38

3) Display problems

The display trouble shooting data.

NO CAUSE

1 Poor contact between P.C.B.

and display filament.

2 The display has some trouble

in its segment or gril.

3 Loss vacumm in the display.

MEASUREMENT

Check the voltage of display pin 1 & 25

Refer to “The display trouble shooting data” below

Find white spot.

RESULT REMEDY

2.6VAC Fix the pin 1 & 25 on the P.C.B.

Replace P.C.B. assembly.

DISPLAY NAME & PIN NO.

Grid 1 (G1), 21

Grid 2 (G2), 17

Grid 3 (G3), 14

Grid 4 (G4), 10

Grid 5 (G5), 4,7

Segment a, 23

Segment b, 22

Segment c, 20

Segment d, 19

Segment e, 18

Segment f, 16

Segment g, 15

Lower bar h, 5

Upper bar i 6, 8, 9 ,11

MICOM OUTPUT IN PIN NO.

24

17

18

16

13

26

25

23

22

21

20

19

14

15

TROUBLE

M/W & AUTO COOK don’t come on.

GRILL & PIE don’t come on.

COMBI & TEMP COOK don’t come on.

WEIGHT DEFROST & Kg don’t come on.

TIME DEFROST doesn’t come on.

Segment “a” doesn’t come on from G1 to G5.

Segment “b” doesn’t come on from G1 to G5.

Segment “c” doesn’t come on from G1 to G5.

Segment “d” doesn’t come on from G1 to G5.

Segment “e” doesn’t come on from G1 to G5.

Segment “f” doesn’t come on from G1 to G5.

Segment “g” doesn’t come on from G1 to G5.

Segment “h” doesn’t come on from G1 to G5.

Segment “i” doesn’t come on from G1 to G5.

39

Fig. 18 Measurement Point

MP1

MP3

MP2

40

41

4) When there is no microwave oscillation.

(1) When touching “M/W” button, oven lamp turns on.

Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 3 (RY3) dose not operate.

CHECK METHOD

(2) When touching “M/W” button, oven lamp dose not turn on.

Turntable motor dose not rotate, but cook indicator in display comes on. * Cause : Relay 4 (RY4) dose not operate.

CHECK METHOD

(3) When touching “M/W” button, oven lamp turns on.

Fan motor dose not rotate, but cook indicator in display comes on. * Cause : Relay 5 (RY5) dose not operate.

POINT

AB

STAGE

RY3 “ON” -5VDC GND RY3 “OFF” GND -12VDC

POINT

AB

STAGE

RY4 “ON” -5VDC GND RY4 “OFF” GND -12VDC

B

Q7 KRA106M

RY3

G5J-1-TP-M-DT

MAGNETRON

D3 1N4148

-12V

A

40

RY4 G5B-1

TRAY MOTOR, LAMP

D4 1N4148

-12V

B

A

Q8 KRA106M

41

B

RY5 G5B-1 FAN MOTOR

D5 1N4148

-12V

A

Q9 KRA106M

42

CHECK METHOD

5) When there is not upper heater.

When touching “TEMP COOK & COMBI” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 2 (RY2) dose not operate.

CHECK METHOD

6) When there is not lower heater .

When touching “TEMP COOK & PIE” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 6 (RY6) dose not operate.

CHECK METHOD

A

43

Q11 KRA106M

B

-12V

D6 1N4148

RY6 G5B-1 LOWER HEATER

POINT

AB

STAGE

RY2 “ON” -5VDC GND RY2 “OFF” GND -12VDC

POINT

AB

STAGE

RY6 “ON” -5VDC GND RY6 “OFF” GND -12VDC

POINT

AB

STAGE

RY5 “ON” -5VDC GND RY5 “OFF” GND -12VDC

B

Q6 KRA106M

RY2

G5J-1-TP-M-DT

UPPER HEATER

D2 1N4148

-12V

A

39

43

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

CHECK METHOD

8) When “” comes on display.

CHECK METHOD

if clock does not keep exact time, you must check. Diode D7, transistor Q2.

POINT WAVEFORM

A B

C

T: 20ms (60 Hz)

POINT

AB

STAGE

Door opened Open -5VDC Doop closed Closed GND

NOTE : Check the state of the secondary interlock switch.

T=20ms (50Hz)

A

D.O.M

1 2

CN1

35313-0210

R11

C5

104

20K

B

R10 330R9 4.7K

47

C6

104

R22 100K 1/4W

R4 10K

1N4148D7 R7 4.7K R5 10K

AC

C3 473

C2 473

B

A

0V

-5V

T

R6

4.7K

Q2 A1266Y

V1

C4 104

45

C

4

5

D10

D11

1N4002X4

AC

D9

D8

44

P.C.B CURCUIT DIA GRAM

4148

106

1266

106

4148

106

- KOC-870T

45

- KOC-870T

P.C.B. LOCATION NO.

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

1 PCB MAIN M208 92X195 3514314920 1 2 TRANS POWER LVT1 DMR-101FS 5EPV041351 1 3 HOLDER VFD PP 3513002600 1 4 R CARBON FILM R17 1/4W, 4.7K OHM J RD-4Z472J- 1 5 R CARBON FILM R22 1/4W, 100K OHM J RD-4Z104J- 1 6 R CARBON FILM R13,18,21 1/4W, 10K OHM J RN-4Z103J- 3 7 R CARBON FILM R28,29 1/4W, 2K OHM J RD-4Z202J- 2 8 R CARBON FILM R12,19,20,27,30 1/4W, 1K OHM J RD-4Z102J- 5 9 R CARBON FILM R31 1/4W 4.7 OHM J RD-4Z479J- 1

10 R CARBON FILM R11 1/6W, 20K OHM J RD-AZ563J- 1

11 R CARBON FILM R3,4,14,15 1/6W, 10K OHM J RD-AZ103J- 4 12 R CARBON FILM R5,6,7,9 1/6W, 4.7K OHM J RD-AZ472J- 4 13 R CARBON FILM R2,8 1/6W, 1K OHM J RD-AZ102J- 2 14 R CARBON FILM R10 1/6W, 330 OHM J RD-AZ331J- 1 15 R CARBON FILM R16 1/6W, 510 OHM J RD-AZ511J- 1 16 R CARBON FILM R1 1/6W, 100 OHM J RD-AZ101J- 1 17 R CARBON FILM R23 1/4W, 10K OHM F RN-4Z1002F 1 18 R CARBON FILM R24 1/4W, 120K OHM F RN-4Z1203F 1 19 BUZZER BZ1 BM-20K 3515600100 1 20 DIGITRON DP1 SVM-5SS13(S/S) DSVM5SS13- 1 21

DIODE SWITCHING

D7 1N4148M DZN4148M-- 1

22

DIODE SWITCHING

D2~D6 1N4148 DZN4148-- 5 23 DIODE RECTIFIER D8~D12 1N4002A DZN4002A-- 5 24 DIODE ZENER ZD1 MTZ 3.9B DZTZ3R9B-- 1 25 DIDOE ZENER ZD2 UZ-5.6B DZTZ5R6B-- 1 26 DIODE ZENER ZD3 MTZ 27B DZTZ27B--- 1 27 C ELECTRO ZD4 MTZ 4.7B DZTZ4R7B--- 1 28 C ELECTRO EC1 RS 50V 10uF CEXE1H100A 1 29 C ELECTRO EC4 RSS 35V 1000uF CEXF1V102V 1 30 C ELECTRO EC2, EC3 RSS 50V 220uF CEXF1H221V 2 31 C ARRAY CA1 8P(7) 50V 1000pF CN7XB-102M 2 32 C CERA AXIAL

C1,C4,C5~C9,C12~C14

H1KF 50V 0.1uF Z CCKF1H104Z 10 33 C CERA AXIAL C10,11 H1KF 50V 1000pF Z CCZF1H102Z 2 34 C CERA AXIAL C2,3 H1KF 50V 0.047uF Z CCKF1H473Z 2 35

CONNECTOR WAFER

CN1 35313-0210 30166M7020 1

36

CONNECTOR WAFER

CN2 35312-0310 30166M5030 1

✔ 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)

46

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

37

CONNECTOR FILM

CN3 HLEM15S-1 4CW215SBD0 1

38

CONNECTOR WAFER

CN4 35328-0610 4CW3061MX0 1 39 TRAMSOSTPR Q1,Q2,Q10 KTA1266Y TZTA1266Y- 3 40 TRANSISTOR Q3,Q4 KRC106M TZRC106M-- 2 41 TRANSISTOR Q6,Q7,Q8,Q9,Q11 KRA106M TZRA106M-- 5 42 RESONATOR CR1 CST4.00MGW 5PCST400MG 1 43 IC MICOM IC1 MB89143 141SC970T0 1 44 RELAY RY4~RY6 G5B-1-12V 5SC0101110 3 45 RELAY RY2~RY3 G5J-1-TP-M-DT 12V 5SC0101112 2 46 R ARRAY RA1~RA3 RGLD7X104J RA-88X104J 3 47 WIRE FLAT 1.25X15X90XC WSJ-159007 1 48 JUMPER WIRE J1,3~6, 8~10 1/0.52 TIN COATING 85801052GY 8 10mm 49 JUMPER WIRE J2,J7 1/0.52 TIN COATING 85801052GY 2 5mm 50 JUMPER WIRE R26 1/0.52 TIN COATING 85801052GY 1 5mm

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

1 PCB SUB M209 86X159.5 3514314930 1 2 COVER LED PP 3511404600 1 3 LED LD101 DLS0-5013T DLS0-5013T 1 4 LED LD102 SLR-34VR DSLR34VR-- 1 5 R CARBON FILM R101,R102 1/4W, 2K OHM J RD-4Z202J- 2 6 SWITCH TACT SW101~SW112 KPT-1115AM 5S50101Z93 12 7 SW ROTARY EN101 SDB161PVB17F-1-2 5S10109002 1

-36-36PC(PINCH 5) 8 CONNECTOR FILM CN101 HLEM 15R-1 4CW215RBD0 1 9 JUMPER WIRE J102,103,104,105 1/0.52 TIN COATING 85801052GY 4 10mm

10 JUMPER WIRE J101 1/0.52 TIN COATING 85801052GY 1 5mm

SUB PCB

✔ 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)

47

PRINTED WIRING BO ARD

1.CIRCUIT CHECK PROCEDURE (K OC-873T)

1) Low voltage transformer (DMR-101FS) chec k.

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

2) V oltage Chec k

KMICOM PIN>

DISPLAY PIN

CHECK METHOD

Terminal

1-2 4-5 6-7

8-10

Voltage

230.0V

13.0V

35.0V

3.0V

NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power

source voltage.

NOTE 2 : The allowable tolerance of the secondary voltage is within ± 5% of nominal voltage.

NO. CHECK POINT REMARK

1 PIN 63, 64 0V 2 PIN 29, 32, 62 -5VDC ± 5% 3 PIN 45

4 PIN 30, 31

NO. MEASURE POINT WAVE FORM REMARK

1 MP 1 -5V DC Replace R29, Q9 2 MP 2 -12V DC Replace D8~D11 3 MP 3 -27V DC Replace R26, R29, ZD2

NOTE :

Each measure point must be measured with GND points.

T=0.25us (4.0MHz)

PIN 1 & 25 2.6VAC (Display filament voltage)

14

5 6

7 8

2

10

0V

-5V

5V

0V

T: 20 ms (50 Hz)

T

48

3) Display problems

The display trouble shooting data.

NO CAUSE

1 Poor contact between P.C.B.

and display filament.

2 The display has some trouble

in its segment or gril.

3 Loss vacumm in the display.

MEASUREMENT

Check the voltage of display pin 1 & 25

Refer to “The display trouble shooting data” below

Find white spot.

RESULT REMEDY

2.6VAC Fix the pin 1 & 25 on the P.C.B.

Replace P.C.B. assembly.

DISPLAY NAME & PIN NO.

Grid 1 (G1), 21

Grid 2 (G2), 17

Grid 3 (G3), 14

Grid 4 (G4), 10

Grid 5 (G5), 4,7

Segment a, 23

Segment b, 22

Segment c, 20

Segment d, 19

Segment e, 18

Segment f, 16

Segment g, 15

Lower bar h, 5

Upper bar i 6, 8, 9 ,11

MICOM OUTPUT IN PIN NO.

24

17

18

16

13

26

25

23

22

21

20

19

14

15

TROUBLE

M/W & AUTO COOK don’t come on.

GRILL & PIE don’t come on.

COMBI & TEMP COOK don’t come on.

WEIGHT DEFROST & Kg don’t come on.

TIME DEFROST doesn’t come on.

Segment “a” doesn’t come on from G1 to G5.

Segment “b” doesn’t come on from G1 to G5.

Segment “c” doesn’t come on from G1 to G5.

Segment “d” doesn’t come on from G1 to G5.

Segment “e” doesn’t come on from G1 to G5.

Segment “f” doesn’t come on from G1 to G5.

Segment “g” doesn’t come on from G1 to G5.

Segment “h” doesn’t come on from G1 to G5.

Segment “i” doesn’t come on from G1 to G5.

49

Fig. 18 Measurement Point

MP1

MP3

MP2

50

51

4) When there is no microwave oscillation.

(1) When touching “M/W” button, oven lamp turns on.

Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 3 (RY3) dose not operate.

CHECK METHOD

(2) When touching “M/W” button, oven lamp dose not turn on.

Turntable motor dose not rotate, but cook indicator in display comes on. * Cause : Relay 4 (RY4) dose not operate.

CHECK METHOD

(3) When touching “M/W” button, oven lamp turns on.

Fan motor dose not rotate, but cook indicator in display comes on. * Cause : Relay 5 (RY5) dose not operate.

POINT

AB

STAGE

RY3 “ON” -5VDC GND RY3 “OFF” GND -12VDC

POINT

AB

STAGE

RY4 “ON” -5VDC GND RY4 “OFF” GND -12VDC

B

RY3

G5G-1A-DT

MAGNETRON

D4

1N4148

-12V

B

RY4

CS11-12SH 1C 1P

TRAY MOTOR, LAMP

D5

1N4148

A

40

Q5 KRA 106M

A

41

-12V

RY5

CS11-12SH 1C 1P

FAN MOTOR

D6

1N4148

-12V

Q6 KRA 106M

B

A

42

Q7 KRA 106M

52

CHECK METHOD

5) When there is not upper heater.

When touching “TEMP COOK & COMBI” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 2 (RY2) dose not operate.

CHECK METHOD

6) When there is not lower heater .

When touching “TEMP COOK & PIE” button, oven lamp turns on. Fan motor and turntable motor rotate and cook indicator in display comes on. * Cause : Relay 6 (RY6) dose not operate.

CHECK METHOD

RY6

CS11-12SH 1C 1P

LOWER HEATER

D7

1N4148

-12V

Q8 KRA 106M

B

A

43

POINT

AB

STAGE

RY2 “ON” -5VDC GND RY2 “OFF” GND -12VDC

POINT

AB

STAGE

RY6 “ON” -5VDC GND RY6 “OFF” GND -12VDC

POINT

AB

STAGE

RY5 “ON” -5VDC GND RY5 “OFF” GND -12VDC

B

RY2

G5G-1A-DT

UPPER HEATER

D3

1N4148

Q4 KRA 106M

-12V

A

39

53

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

CHECK METHOD

8) When “” comes on display.

CHECK METHOD

if clock does not keep exact time, you must check. Diode D1, transistor Q1.

POINT WAVEFORM

A B C

T: 20ms (60 Hz)

POINT

AB

STAGE

Door opened Open -5VDC Doop closed Closed GND

NOTE : Check the state of the secondary interlock switch.

T=20ms (50Hz)

A

D.O.M

1 2

CN1

35313-0210

R3

C2

104

20K

B

R7 330R4 4.7K

47

C1

104

R8 100K 1/4W

R1 10K

1N4148 D1 R11 4.7K R10 10K

AC

C6 473

C5 473

B

A

0V

-5V

T

R2

4.7K

Q1 A1266Y

V1

C4 104

45

C

4

5

D10

D11

1N4004X4

AC

D9

D8

54

P.C.B CURCUIT DIA GRAM

R12

104

R8

1/4W

100K

C9

104

RY1

G5G-1A-DT

RY2

SLOW ACTING

1N4148

D2

D3

KRA 106M Q3

R9

3.3V

4.7 1/4W

2K 1/4W

V2

D7

UPPER HEATER

2

645

3

D5

TRAY MOTOR,LAMP

G5G-1A-DT

RY3

UPPER HEATER

RY4

CS11-12SH 1C 1P

MAGNETRON

D4

1N4148

FAN MOTOR

RY5

CS11-12SH 1C 1P

RY6

CS11-12SH-1C 1P

D6

1N4148

2

DMR-101FS

1

35328-0610

1

CN4

LVT1

+

35V

D11

5

4

D10

1N4148

AC

-

D8

D9

EC4

1000uF

-

+

1N4004Ax4

1N4004A

7

D12

8

6

EC2

C12

R26

F2

R27

R30

50V

220uF

104

C1

C2

4.7K

R15

KRA 106M Q4

KRA 106M Q5

R19

KRA 106MQ6KRA 106M

Q7

104

1/4W

C7

R20

V1

1

1/4W

THERMISTOR

BM-20K

BZ1

R21

R28

1K,1/4W

V2

4.7K

10K,1%

CN2

3

1

PTM-K312-D7

R4

D.O.M SW

35312-0310

1K

1/4W

120K,1%

1/4W

R18

R16

330

V1

R7

-

+

35313-0210

ZD4

104

+

220uF

R29

V2

KRA 106M

Q8

C14

-

EC3

CN1

2

A1266Y Q9

ZD2

50V

27V

5.6V

V3

1K

1/4W

510

104

10uF

R14

V1

R3

20K

104

C13

EC1

104

V1

C8

R5

50V

100

ZD1

R6

1K

C3

Q2

A1266Y

V1 : - 5V

V2 : -12V

V3 : -27V

9

10

F1

ZD3

4.7V

AC

A1266Y

R11

D1

C6

437

4.7K

1N4148

R10

R2

10K

R1

4.7K

C5

437

10K

Q1

V1

R17

V1

C4

104

10K

V1

10K

1/4W

SJ3

SJ1

SJ2

R13

10K10K

CR1

KBR-4.0MKSTF

V1

20

c

43

39

MB89143

38

IC1

42

40

41

252426

22

21

23

e

g

c

SVM-5MS06

DP1

f

l

b

G1

a

b

d

h

G1

COOK

+1min

PROGRAM

+10sec

7

RGLD7X104J

BUZZ

1

21

20

23

22

18

17

16

19

61

60

47

13

14

15

RA1

6

5

6,8,9,11

151618

19

171014

RGLD7X104J RA2

V3

4,7

5

RGLD7X104J

MODA 29

VSS

AVSS

32

62

53

52

AVR

VCC

63

64

28

RSTX

50

51

RA3

2

4

B7102M

V1

CA1

8

6

e

hijk

g

c

ee

g

l

g

f

b

l

a

e

f

c

d

f

b

l

a

G4

G2

f

G3

j

G2

i

d

G4

d

j

e

g

c

1

b

f

l

a

l

G5

F2

25

G5

d

k

F1

CN3

STOP/

CLEAR

GRILL

10

START

PIE

14

12

DEFROST

COMBI

TEMP

M/W

CLOCK

HLEM15S-1

1/4W

1K R22

45

INT

0

R23

49

R25

1K

10K

1/4W

48

545655

X0 30

10K

1/4W

R24

HLEM15R-1

CN3

V1

C11

V1

104Z

531

V1

C10

104Z

X1 31

SDB161PVB17F

3

1

2

EN101

- KOC-873T

55

P.C.B. LOCATION NO.

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

1 PCB MAIN M218 91.5X212.7 3514326600 1 2 TRANS POWER LVT1 DMR-101FS 5EPV041351 1 3 HOLDER VFD DPH PP 3513002000 1 4 R CARBON FILM R15 1/4W, 4.7K OHM J RD-4Z472J- 1 5 R CARBON FILM R8 1/4W, 100K OHM J RD-4Z104J- 1 6 R CARBON FILM R17,23,24 1/4W, 10K OHM J RN-4Z103J- 3 7 R CARBON FILM R26,27 1/4W, 2K OHM J RD-4Z202J- 2 8 R CARBON FILM R16,22,25,28,29 1/4W, 1K OHM J RD-4Z102J- 5 9 R CARBON FILM R30 1/4W 4.7 OHM J RD-4Z479J- 1

10 R CARBON FILM R3 1/6W, 20K OHM J RD-AZ563J- 1

11 R CARBON FILM R1,9,10,12,13 1/6W, 10K OHM J RD-AZ103J- 5 12 R CARBON FILM R2,4,11 1/6W, 4.7K OHM J RD-AZ472J- 3 13 R CARBON FILM R6 1/6W, 1K OHM J RD-AZ102J- 1 14 R CARBON FILM R7 1/6W, 330 OHM J RD-AZ331J- 1 15 R CARBON FILM R14 1/6W, 510 OHM J RD-AZ511J- 1 16 R CARBON FILM R5 1/6W, 100 OHM J RD-AZ101J- 1 17 R CARBON FILM R21 1/4W, 10K OHM F RN-4Z1002F 1 18 R CARBON FILM R18 1/4W, 120K OHM F RN-4Z1203F 1 19 BUZZER BZ1 BM-20K 3515600100 1 20 DIGITRON DP1 SVM-5SS13(S/S) DSVM5SS13- 1 21

DIODE SWITCHING

D1, 3~7 1N4148 DZN4148-- 6 22 DIODE RECTIFIER D8~D12 1N4002A DZN4002A-- 5 23 DIODE ZENER ZD1 MTZ 3.9B DZTZ3R9B-- 1 24 DIDOE ZENER ZD4 UZ-5.6B DZTZ5R6B-- 1 25 DIODE ZENER ZD2 MTZ 27B DZTZ27B--- 1 26 C ELECTRO ZD3 MTZ 4.7B DZTZ4R7B--- 1 27 C ELECTRO EC1 RS 50V 10uF CEXE1H100A 1 28 C ELECTRO EC4 RSS 35V 1000uF CEXF1V102V 1 29 C ELECTRO EC2, EC3 RSS 50V 220uF CEXF1H221V 2 30 C ARRAY CA1 8P(7) 50V 1000pF CN7XB-102M 1 31 C CERA AXIAL C1~4,7~9,12~14 50V 104z AXIAL CCZF1H104Z 10 32 C CERA AXIAL C10,11 H1KF 50V 1000pF Z CCZB1H102Z 2 33 C CERA AXIAL C5,6 H1KF 50V 0.047uF Z CCZF1H473Z 2 34

CONNECTOR WAFER

CN1 35313-0210 30166M7020 1 35

CONNECTOR WAFER

CN2 35312-0310 30166M5030 1 36

CONNECTOR FILM

CN3 HLEM15S-1 4CW215SBD0 1

- KOC-873T

✔ 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)

56

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

37

CONNECTOR WAFER

CN4 35328-0610 4CW3061MX0 1

38 TRAMSOSTPR Q1,Q2,Q9 KTA1266Y TZTA1266Y- 3 39 TRANSISTOR Q4~8 KRA106M TZRA106M-- 5 40 RESONATOR CR1 CST4.00MGW 5PCST400MG 1 41 IC MICOM IC1 MB89143AP-235 141SG870T0 1 42 RELAY RY4~RY6 CS11-12SH 1C 1P 5SC0101128 3 43 RELAY RY2~RY3 G5G-1A-DT DC12V 5SC0101123 2 44 R ARRAY RA1~RA3 RGLD7X104J RA-88X104J 3 45 WIRE FLAT WF1 1.25X15X90XC WSJ-159007 1 46 JUMPER WIRE J2,8 1/0.52 TIN COATING 85801052GY 2 7.5mm 47 JUMPER WIRE J1,7,9,10,11 1/0.52 TIN COATING 85801052GY 7 10mm 48 JUMPER WIRE J3~6 1/0.52 TIN COATING 85801052GY 4 12.5mm

NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK

1 PCB SUB M219 85.5X212.7 3514326700 1 2 SWITCH TACT

SW101~110,112,113

KPT-1115AM 5S50101Z93 12

3 SW ROTARY SW 111 SDB161PVB17F-1-2 5S10109002 1

-36-36PC(PINCH 5)

4

CONNECTOR FILM

CN101 HLEM 15R-1 4CW215RBD0 1

5 JUMPER WIRE J101,102 1/0.52 TIN COATING 85801052GY 2 10mm

SUB PCB

✔ 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)

S/M NO. : C870T0S004

DAEW OO ELECTRONICS CO., LTD .

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

PRINTED DATE: Aug, 2002

Daewoo KOC-870T0S, KOC-873T, KOC-870T5S, KOC-873T0S, KOC-873T5S Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WIRING DIAGRAM

SCHEMATIC DIAGRAM