Service Manual - de-direct.co.uk · Service Manual Microwave Oven Model: KOC-870T0S KOC-870T5S KOC-873T0S KOC-873T5S DAEWOO ELECTRONICS CO., LTD. S/M No. : C870T0S004 ... (Only a

Service ManualMicrowave OvenModel: KOC-870T0S

KOC-870T5S

KOC-873T0S

KOC-873T5S

DAEWOO ELECTRONICS CO., LTD.

S/M No. : C870T0S004

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

1

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVE ENERGY(a) Do not operate or allow the oven to be operated with the door open.

(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro-wave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal andsealing 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 andtransmission systems shall be repaired, replaced, or adjusted by procedures described in this manual beforethe oven is released to the owner.

(e) A microwave leakage check to verify compliance with the Federal Performance Standard should beperformed 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 PRECAUTIONS

1. For Safe OperationDamage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and maycause 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 concealedswitches 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 : EarthBlue : NeutralBrown : Live

As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markingsidentifying 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 withthe 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 colouredblack.The wire which is coloured brown must be connected to the terminal which is marked with the letter ‘L’ or colouredred.

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 WEIGHTDEFROST

TIME

AUTOCOOK

PIE TEMPCOOK

kg

1. Roast Beef2. Roast Pork3. Roast Chicken4. Fish Fillets5. 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


TIME

AUTOCOOK

PIE TEMPCOOK

kg


Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/CLEAR

START

1 DOOR SEAL - Door seal maintains the microwavewithin the oven cavity and prevents microwave leakage.

2 DOOR HOOK - When door is closed, it will automaticallylock shut. If door is opened while oven is operating,magnetron tube will immediately stop operating.

3 DOOR SCREEN - Allows viewing of food. Microwavecannot pass through perforations in screen.

4 GRILL HEATER - Turns on when grill and simulta-neous cooking is selected.

5 OVEN LAMP - Automatically turns on during ovenoperating.

6 SAFETY INTERLOCK SYSTEM

7 CONTROL PANEL

8 TURNTABLE TRAY - Rotates during cooking andensure even distribution of Microwaves. It can also beused as a cooking utensil.

9 OVEN FRONT PLATE

0 ROTATING BASE - This fits over the shaft in the centerof the oven’s cavity floor. This is to remain in the oven forall cooking. It should only be removed for cleaning.

q UNDER HEATER

NAMES AND FUNCTION OF PARTS

5

CONTROL PANEL

When blinking, the oven isoperating in COMBI cooking.

When blinking, the oven isoperating in WEIGHTDEFROST.When blinking, the oven isoperating in TIME DEFROST.

When blinking, the oven isoperating in weight inputmode.

Cooking time is increasedby 1 minute.

Cooking time is increasedby 10 seconds.

FUNCTION BUTTONUsed to select desired oven operation.;Grill, Combi, PieTemp, 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 Button-Used to set desired time.(Time increases by 30 secondsfrom 30 seconds to 5 minutes.)

Guide Lamp-When blinking, it informs you tobe ready to operate dial knob.

Dial Knob-Used to set the cooking time,time of day and weight input.

When blinking, the oven isoperating in GRILL

When blinking, the onve isoperating in MICROWAVE COOK

When blinking, the oven isoperating in AUTO COOK.

When blinking, the oven isoperating in PIE COOK.

Microwave Button-Used to select the variable microwave power level. If this button ispressed 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 isoperating in CONVECTION(TEMP COOK)

Grill

M/W

Combi +1 min

Pie Temp +10 sec


TIME

AUTOCOOK

PIE TEMPCOOK

Kg


Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/CLEAR

START

KOC-870T

6

CONTROL PANEL

KOC-873T

Defrost +1min

AutoCook

TempCookPie Kg

MW CombiGrill WeightDefrost

Time

+10sec

KOC-873T0S

Clock Pie

MW

Grill Combi

TIME WEIGHT/QUANTITY

STOP/CLEAR

START/SPEEDY COOK

Auto Cook Menu1. Roast beef2. Roast pork3. Roast chicken4. Fish Fillet5. Vegetable

AutoCook

Temp

When blinking, the oven isoperating in “Combi” cookingmode.When blinking, the oven isoperating in “Grill” cookingmode.

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

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

When blinking, the oven isoperating in “Pie” cookingmode.

Temp Button -Used to set desired temperature.If this button pressed formore than 1.3 seconds,number is scrolled upautomatically.

Clock Button - Used to settime.

Microwave Button -Used to select the variablemicrowave power level. If thisbutton is pressed for morethan 1.3 seconds, number isscrolled up automatically.

Dial Knob- Used to input thecooking time and quantity.

STOP/CLEAR Button - Usedto pause and clear allinformation manually put intothe oven.

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

When blinking, the oven isoperating in weight inputmode.

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

Cooking time is increased by1 minute.Cooking time is increased by10 seconds.

FUNCTION BUTTON-Usedto select desired ovenoperation.;Grill, Combi, Pie, Temp,Auto Cook, MW, Defrost.

START Button - Used tostart the selected cycle.

SPEEDY COOK Button -Used to program quicklycooking time in 30 secondsincrements. (Time increasesby 30 seconds from 30seconds to 5 minutes.)

7

TO STOP THE OVEN WHILE THE OVEN IS OPERATING1. 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 whenthe door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave.

(1) Primary interlock switchWhen 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

Mountingscrew

Upper Hook

Primaryinterlockswitch

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 thebutton of the interlock monitor switch to bring it under ‘OFF’ condition. The latch Lever press the button on the secondaryinterlock 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

PRECAUTIONS 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 duringnormal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from ashort 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 secondaryinterlock 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 aretightened.

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

11

1. To remove cabinet. (Refer to Fig. 1)

1) Remove three screws on cabinet back.

2) Push the cabinet backward.

2. To remove guide wind assembly. (Refer to Fig. 2)

1) Release two screws ②.

2) Remove back-cover③.

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. 25 4 3

2 1

12

3. To remove 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. To remove magnetron. (Refer 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

1 2

14

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

(1) Remove a screw holding control panel assembly to the ovenfront plate.At the same time, draw forward the control panel assemblyfrom oven front plate.

(2) Remove the Dial knob ⑪

(3) Remove nine screws ⑪ which secure the main and subPCB 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 toprevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwaveleakage. It shall not exceed 4mW/cm2 for a fully assembled oven with door normally closed.

Wave guide Magnetron antenna

Metallic gasket plate

Magnetron antennaMetallic gasket plate

Cooling fin

<Magnetron>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

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

0q

1 2 3 4 5 6 7

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


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 microwaveenergy 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 thesensing 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 beequipped 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

45

6

7

CUTTING(5EA)

Grill

M/W

Combi +1 min

Pie Temp +10 sec


TIME

AUTOCOOK

PIE TEMPCOOK

kg

1. Roast Beef2. Roast Pork

3. Roast Chicken4. Fish Fillets

5. Vegetable

Auto Cook

TIME/WEIGHT

Speedy

-

+

Clock

Defrost

M/W

STOP/CLEAR

START

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 SHOOTING GUIDE

Condition Check Result Cause Remedy

Fuse blows Check continuity ofinterlock monitor switch with door closed(COM↔NC)

Check continuity of bothprimary and secondaryinterlock switch with doorclosed

Check continuity ofprimary winding of lowvoltage transformer

Disconnect high voltagefuse and operate the unit

Continuity

NoContinuity

Continuity

Continuity

0 Ω orinfinite

Fuse againblows

Approx.150~210(normal)

Replace

Replace

Replace

Replace

(COM↔NC)

Note 1.

Note 1.

(COM↔NC)

Malfunction of interlockmonitor switch

NoContinuity

Malfunction ofinterlock switch

Check continuity ofprimary interlock switchcontact with door partiallyopen until interlockmonitor switch contactclose(COM NC close)

Replace

Note 1.

Shorted contacts of primary interlockswitch.

Defective lowvoltage transformer

Defective highvoltage transformer

Following the procedure below to check if the oven is defective 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 listedbelow.

21

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


Replace Outlet hasproper voltage.Fuse does notblow.

Checkcontinuitymagnetron

NoContinuity

Defective magnetron

Replace Check continuity ofnoise filter board

NoContinuity

Defective line filterboard


Adjust orreplace

Grill heater isnot heated

Check continuity ofprimary interlockswitch

NoContinuity

Malfunction of PrimaryInterlock Switch

Adjust orreplace

Check continuity ofsecondary interlockswitch

NoContinuity

Malfunction ofsecondary interlockswitch

ReplaceCheck continuity ofheater

NoContinuity

Defective heater

ReplaceCheck D.C. voltagebeing supplied toRELAY (RY2) coil

0V Defective touch controlcircuit

ReplaceApprox.13VDC

Faulty contacts ofRELAY (RY2) or openrelay coil

Adjust.NoContinuity

Normal

Open power supplycord

Adjust.

Check continuity ofpower supply cord

Defective touch controlcircuit

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


Remedy

No microwaveoscillation

Check continuity ofhigh voltage fuse

Check continuity ofhigh voltage capacitorterminals with wiresremoved

Continuity Replace

Replace high voltage fuse

Defective highvoltage rectifier

Check continuity ofhigh voltage rectifierin forward andbackward directionwith DC megger

Continuity in backwarddirection

Replace

Defective magnetron

Connect meggerleads to magnetronterminal andmagnetron body

Continuity Replace


Check resistance ofprimary andsecondary coil of highvoltage transformer

0 Ω or ∞ Replace

Defective magnetron

Check continuity ofmagnetron with wiresremoved

NoContinuity

Replace


Check continuity offilament terminal ofhigh voltagetransformer

NoContinuity

Replace

Defective timer ass’y

Check continuity ofmicrowave selectswitch

Replace

Defective touchcontrol circuit

Check D.C. voltagebeing supplied toRELAY (RY3) coil

0V Replace

Faulty contacts orRELAY (RY3) oropen relay coil

Approx.13VDC

Replace

NoContinuity

NoContinuity

23

(TROUBLE 4) Display shows all figures selected, but oven does not start cooking, even though desired programand time are set and start pad is tapped.

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


Adjust orreplace

Adjust orreplace

Replace

Replace

Turn table motor, andoven lamp do not turn on

Check continuity of primary interlock switch

Check continuity ofsecondary interlock andD.O.M. switch

NoContinuity

0V

Approx.13VDC

Check D.C. voltage beingsupplied to RELAY (4)coil.

NoContinuity

Malfunction ofPrimary interlockswitch

Malfunction ofsecondary interlockand D.O.M. switch


Faulty contacts ofRELAY (4) or openrelay coil


Adjust orreplace

Adjust orreplace

Replace

Replace

Replace

Under heater is notheated

Check continuity of primary interlock switch

Check continuity of secondaryinterlock switch

Check continuity ofheater

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

NoContinuity

NoContinuity

NoContinuity

0V

Approx.13VDC

Malfunction ofPrimary interlockswitch

Malfunction ofsecondary interlockswitch

Defective Heater


Faulty contacts ofRELAY (RY6) oropen 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 morenumbers is the display.

13. One or more digits in the display are not on when theyshould 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" contactsclose if they are close, replace touch control circuit.

M/W GRILL COMBI WEIGHT TIMEDEFROST

AUTO PIE TEMP kgCOOK 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 membranceswitch assembly


Replacecontrol boxsub-assembly

Replace thebuttonkeyboard

Display does not showprogramming at all, evenif keyboard is touched.

Check each button forcontinuity of the buttonkeyboard for the followingkeyboard checkprocedure

Normal

Abnormal

Malfunction oftouch controlcircuitry of controlbox sub-assembly

Malfunction of thebutton 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 beconnected 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

567

53

52

51

50

RA3 RGLD7X104J CA1 B7102M

SW101GRILL

SW107AUTOCOOK

SW103+min

SW106+10sec

SW109STOP/CLEAR

SW108 START

SW102COMBI

SW105TEMP

SW104PIE

SW111DEFROST

SW110M/W

SW112CLOCK

1) AUTO COOK button : Between 4 and 10 2) DEFROST button : Between 4 and 143) ˚C, TEMP button : Between 8 and 124) MICROWAVE button : Between 6 and 14 5) COMBI button : Between 6 and 126) GRILL button : Between 2 and 10 7) +10 SEC button : Between 8 and 108) +1 MIN button : Between 6 and 109) STOP/CLEAR button : Between 2 and 12

10) START button : Between 4 and 1211) CLOCK button : Between 8 and 1412) 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 beconnected 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

567

53

52

51

50

RA3 RGLD7X104J CA1 B7102M

GRILL

AUTOCOOK

+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 143) ˚C, TEMP button : Between 8 and 124) MICROWAVE button : Between 6 and 14 5) COMBI button : Between 6 and 126) GRILL button : Between 2 and 10 7) +10 SEC button : Between 8 and 108) +1 MIN button : Between 6 and 109) STOP/CLEAR button : Between 2 and 12

10) START button : Between 4 and 1211) CLOCK button : Between 8 and 1412) PIE button : Between 2 and 14

BUTTON KEYBOARD CHECK PROCEDURE (KOR-873T)

27

1. Microwave Output Power

1-1. Standard MethodMicrowave output power can be checked by indirectlymeasuring the temperature rise of a certain amount of waterexposed to the microwave as directed below.1) Microwave power output measurement is made with the

microwave oven supplied at rated voltage and operatedat its maximum microwave power setting with a load of1,000 ± 5cc of potable water.

2) The water is contained in a cylindrical borosilicate glassvessel having a maximum material thickness of 3 mmand an outside diameter of approximately 190 mm.

3) The oven and the empty vessel are at ambienttemperature 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 tothe vessel. After addition of the water to the vessel, theload is immediately placed on the center of the shelfwhich 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 genera-tor is operating at full power.

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

7) The microwave power output P in watts is calculatedfrom 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 Switch1) 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 theswitch, when the door is opened, and when the door isclosed.

2) Secondary Interlock Switch1) 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 ovendoor is closed.

3) Interlock Monitor Switch1) Disconnect the lead wire connecting the primary

interlock switch and interlock monitor switch fromprimary interlock switch terminal.

2) Connect the ohm-metor leads between the lead wireconnector disconnected as item '1' and the power supplynatural plug pin.

3) Read the value of resistance between the lead wireconnector and the power supply natural plug pin, whenthe oven door is opened, and when the oven door isclosed.

P=4187 xT/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 wallreceptacle before testing.

Water Load

Tray

Fig. 16

MEASUREMENT

Fig. 12

28

2-2. JudgementThe value of resistance should be applied to the valuespecified below.

3. Microwave Leakage Test

3-1. Warning1) DO NOT place your hands into any suspected

microwave leakage field unless the safe density level isknown.

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

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

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

3-2. MethodThe power density of the microwave leakage emitted by themicrowave oven should not exceed 1mW/cm2at any point50mm (2 in). or more away from the external surface of theoven as measured prior to acquisition by a purchaser andthere after once the oven is in use, 4mW/cm2 at any point50mm (2 in) or more away from the external surface of theoven, checks to be made around the whole of the door sealand on each of the main unit surface.Measurements should be made with the oven operating atits maximum output and containing a load of 275 ±15milliliters of tap water initially at 68±9˚F(20±5˚C) placedwithin the cavity at he center of the load carrying surfaceprovided by the manufacture. The water container shouldbe a low from 600 milli-liters beaker having an insidediameter of approximately 85mm (3-11/32 in.) and made ofan electrically nonconductive material such as glass orplastic.

3-3. Procedures1) 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 fewminutes 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


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. 0ΩPrimary winding .............................................Approx. 0Ω

2. High voltage capacitorA) 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 diodeThe high voltage diode is located on the base near thetransformer.

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

(B) With the ohmmeter set on the highest resistance scale,measure the resistance across the diode terminals.Reverse the meter leads and again observe theresistance reading. Meter with 6V, 9V or higher voltagebatteries should be used to check the front-to-backresistance may be read in both directions. A normaldiodes resistance will be infinite in one direction andseveral hundred KΩ in the other direction.

4. MagnetronFor complete magnetron diagnosis, refer to "Measure-ment of the Microwave Output Power".Continuity checks can only indicate and open filament ora shorted magnetron. To diagnose for an open filamentor shorted magnetron.

(A) Isolate magnetron from the circuit by disconnecting theleads.

(B) A continuity check across magnetron filament terminalsshould indicate one ohm or less.

(C) A continuity check between each filament terminal andmagnetron case should read open.

Secondaryterminal

Primary terminal

Filament terminal

COMPONENT TEST PROCEDURE

Magnetronantenna

Filamentterminal

Magnetronchassisground

Metallicgasketplate

30

GN

: G

RE

EN

GE

: G

RE

EN

SIN

GLE

PH

AS

EP

OW

ER

SU

PP

LY

[CO

ND

ITIO

N]

1.D

OO

R :

CLO

SE

D2.

CO

OK

: O

FF

GE

~O

NLY

L N

SE

CO

ND

AR

Y

L.V

.TR

AN

SFO

RM

ER

CM

: C

ON

VE

CTI

ON

FA

N M

OTO

RTT

M :

TUR

NTA

BLE

MO

TOR

OL

: OV

EN

LA

MP

FM :

FAN

MO

TOR

RE

LAY

FAN

CONT

ROL

P.W

.B. A

SS’Y

SW

ITC

HIN

TER

LOC

K

D.O

.M. S

WIT

CH

BK

: B

LAC

K

RD

: R

ED

WH

: W

HIT

E

HE

ATE

RU

ND

ER

RE

LAY

RE

LAY

MO

TOR

GN

BR

: B

RO

WN

BL

: BLU

EY

W :

YE

LLO

W

BL

HE

ATE

RTO

P

RE

LAY

RD

CU

T-O

UT

THE

RM

AL

RD

LIN

E F

ILTE

RA

SS

’Y

WH

GN

FUS

E

BR

BL

RD

BR

WH

YW

RDRD

(UP

PE

R)

SW

ITC

HIN

TER

LOC

K

BL

RD

PR

IMA

RY

UNDER HEATER

YW

CO

M.

BL

BK

BK

BK

NO

.

YW NC

.B

KB

L

TOP HEATER

WH

MO

NIT

OR

INTE

RLO

CK

CO

M.

NC

.

SW

ITC

H

NO

.W

H

RD

THE

RM

ISTO

R

/YE

LLO

W

WH

WH

RE

LAY

PO

WE

R

CA

PA

CIT

OR

H.V

.

DIO

DE

H.V

.

H.V

.FU

SE

TRA

NS

FOR

ME

R

WH

H.V

.

MAGNETRON

FMO

LTT

M

WIRING DIAGRAM

31

L.V.TRANSFORMER

2.COOK : OFF1.DOOR : CLOSED

[CONDITION]

CM : CONVECTION FAN MOTORTTM : TURNTABLE MOTOR

FM : FAN MOTOROL : OVEN LAMP

RELAYFAN

RELAYMOTOR

FUSE

ASS’YLINE FILTER

GE

ONLYSINGLE PHASEPOWER SUPPLY

~L BR

BLN

RD

BR

WH

WHRD

GN

THERMAL

RD

CUT-OUT

YW YW

RD

INTERLOCKPRIMARY

(UPPER)SWITCH

BL

RD

RD

SECONDARY

/YELLOWBR : BROWN

CONTROL P.W.B. ASS’Y

YW : YELLOWBL : BLUE

D.O.M. SWITCH

BK : BLACKWH : WHITERD : RED

HEATERUNDER

RELAY

GN

INTERLOCKSWITCH

GN : GREENGE : GREEN

TOP

BL

HEATERRELAY

RELAYPOWER

THERMISTOR

WH

WH

UN

DE

R H

EA

TER

COM.

YW

NC.

NO.

BKBK

BL

WH

BK

BKBL

TOP

HE

ATE

R

WH

INTERLOCK

NC.

MONITORSWITCH

COM. NO.

RD

WH

H.V.

FUSEH.V.

DIODEH.V.

CAPACITOR

TRANSFORMERH.V.

MA

GN

ETR

ON

IDLE CONDITION

OLFM TTM



L


1.DOOR : CLOSED2.COOK : OFF

~

L.V.TRANSFORMER

RELAY


FM : FAN MOTOROL : OVEN LAMP

[CONDITION]

FAN

BK : BLACKWH : WHITE

MOTORRELAY

UNDERHEATERRELAY

RD : REDYW : YELLOWBR : BROWN

D.O.M. SWITCH

BL : BLUE

TOP

RELAYHEATER

BR

GN

WH

FUSE

LINE FILTERASS’Y

BLN

GE

RD

WHRD BR YW

THERMALCUT-OUT

RD

BL

RD

RD

INTERLOCKSWITCH

PRIMARY

(UPPER)RD

TOP

HE

ATE

R

UN

DE

R H

EA

TER

INTERLOCKSWITCH

SECONDARY

COM.

YWBL

BL

NC.

NO.

GN

BLBK

YW

BK

NO.

MONITORSWITCH

NC.

INTERLOCK

BK BK

COM.

WH

RD

WH

THERMISTOR

/YELLOW

RELAYPOWER WH

WH

CAPACITOR

DIODEH.V.

TRANSFORMERH.V.

WH

FUSEH.V.

H.V.

MA

GN

ETR

ON

MICROWAVE COOKING CONDITION

FM OL TTM

SCHEMATIC DIAGRAM

32

L.V.TRANSFORMER

MOTORRELAY

1.DOOR : CLOSED

2.COOK : OFF

[CONDITION]


OL : OVEN LAMPFM : FAN MOTOR

FANRELAY

LINE FILTERASS'Y

L BR

N BL

GE

SINGLE PHASEONLY

POWER SUPPLY

~

WH

RDFUSE

RD WH

GN

BR YW YW

(UPPER)

SWITCH

PRIMARYINTERLOCK

RD

CUT-OUTTHERMAL

RD

BL

RD

RD

RELAYPOWER

GE : GREENGN : GREEN

CONTROL P.W.B. ASS'Y

BL : BLUE

BR : BROWNYW : YELLOW

D.O.M. SWITCH

WH : WHITEBK : BLACK

RD : RED

RELAY

UNDERHEATER

RELAYHEATERTOP

/YELLOW

THERMISTOR

WH

WH

WH

TOP HEATER

UNDER HEATER

INTERLOCKSECONDARY

COM.

SWITCH

GN

NC.

NO.

BL

YW

BK

BL

BL

BK

BK BK

NC.

WH

MONITORSWITCH

INTERLOCK

COM. NO. WH

RD

DIODEH.V.

TRANSFORMERH.V.

H.V.CAPACITOR

H.V.FUSE

MAGNETRON

GRILL COOKING CONDITION

OLFM TTM

HEATER

BL

GE : GREENGN : GREEN



~

SWITCH

L.V.TRANSFORMER

RELAYFAN


OL : OVEN LAMPFM : FAN MOTOR1.DOOR : CLOSED

2.COOK : OFF

[CONDITION]RD : REDWH : WHITEBK : BLACK

MOTORRELAY

UNDER

RELAYHEATER

BL : BLUE

BR : BROWNYW : YELLOW

D.O.M. SWITCH

GN

TOP

BL

RELAY

THERMAL

ASS’YGE

WH

LINE FILTER

N BL

L BR

FUSERD

GN

BR

CUT-OUT

RD WH YW

RD

SWITCH(UPPER)

RD

RD

RD

BL

PRIMARYINTERLOCK

TOP

HE

ATE

R

WHBKBK

UN

DE

R H

EA

TER

COM.

YWBL

YW

SECONDARY

NC.

NO.

INTERLOCK

BK

BK

INTERLOCKMONITORSWITCH

COM. NO.

NC.RD

WH

THERMISTOR

/YELLOW

POWERRELAY

WH

WH

CAPACITORH.V.

H.V.DIODE

H.V.FUSE

TRANSFORMER

WH

H.V.

MA

GN

ETR

ON

COMBI COOKING CONDITION

FM OL TTM

33

L.V.TRANSFORMER

MOTORRELAY

2.COOK : OFF1.DOOR : CLOSED

[CONDITION]

TTM : TURNTABLE MOTORCM : CONVECTION FAN MOTORFM : FAN MOTOROL : OVEN LAMP

RELAYFAN

ASS’YLINE FILTER

GE

ONLY~L

N

BR

BL

SINGLE PHASEPOWER SUPPLY

WH

GN

RDFUSE

CUT-OUT

RD WH BR YW YW

PRIMARY

(UPPER)SWITCHINTERLOCK

RD

THERMAL

BL

RD

RD

RD

SWITCH

POWERRELAY



YW : YELLOWBL : BLUE

BR : BROWN

D.O.M. SWITCH

RD : REDWH : WHITEBK : BLACK

UNDER

RELAYHEATER

GN

RELAYHEATER

BL

TOP

/YELLOW

THERMISTORWH

WH

WH

TOP

HE

ATE

RBKBK

UN

DE

R H

EA

TER

WH

SECONDARYINTERLOCK

COM.

NC.

NO.

BL

YW

BKBL

BK

SWITCH

COM. NO.

NC.

INTERLOCKMONITOR

WH

RD

DIODEH.V.

FUSE

H.V. TRANSFORMER

H.V.CAPACITOR

H.V.

MA

GN

ETR

ON

CONVECTION COOKING CONDITION

OLFM TTM

3

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


12 HEATER *U AS KOC-971C0S 3512802100 1


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


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


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


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


38 COVER INSULATOR *T SECC T0.5 3511405000 1

39 HEATER *T 115V 550W QUARTZ 3512803000 2

36

NO NAME SPECIFICATION PART CODE Q'TY

40 PROTECTOR WIRE STS430 3517502700 2

41 PROTECTOR HEATER MICA T1.0 3517502700 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


52 SCREW SPECIAL TT2 HEX FG 4X10 SE MFZN 7S427W40A1 2

53 SENSOR TEMPERATURE PTM-K312-D4 3514800800 1


55 CORD POWER AS 3X1.5 40X40 120-TML 35113ACSJ5 1

3X1.0 40X40 120-TML 35113BCSM5 1


57 THERMOSTAT 100/90 3518905000 1

58 SCREW TAPPING T2S PAN 3X8 7121300811 1

59 CABINET PCM T0.6 3510800800 1


61 GUIDE TRAY AS KOC-871C0S 3512516100 1

62 TRAY METAL SPP T0.6 3517205600 1

37

PRINTED WIRING BOARD

1.CIRCUIT CHECK PROCEDURE (KOC-870T)1) Low voltage transformer (DMR-101FS) check.

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

2) Voltage Check

KMICOM PIN>

DISPLAY PIN

CHECK METHOD

Terminal

1-2

4-5

6-7

8-10

Voltage

230.0V

13.0V

35.0V

3.0V

1 4

56

78

102

NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of powersource 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-5V

0VT: 20 ms (50 Hz)

T0V

5VT=0.25us (4.0MHz)

PIN 1 & 25 2.6VAC (Display filament voltage)

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 troublein its segment or gril.

3 Loss vacumm in the display.

MEASUREMENT

Check the voltage of display pin 1 & 25

Refer to “The display trouble shootingdata” below

Find white spot.

RESULT REMEDY

2.6VAC Fix the pin 1 & 25 onthe 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 A BSTAGE

RY3 “ON” -5VDC GND

RY3 “OFF” GND -12VDC

POINT A BSTAGE



A

40

Q7 KRA106M

B

D3

1N4148

-12V

RY3

G5J-1-TP-M-DT

MAGNETRON

A

41

Q8 KRA106M

B

-12V

D4

1N4148

RY4

G5B-1

TRAY MOTOR, LAMP

A

42

Q9 KRA106M

B

-12V

D5

1N4148

RY5

G5B-1

FAN MOTOR

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 A BSTAGE



POINT A BSTAGE



A

39

Q6 KRA106M

B

D2

1N4148

-12V

RY2

G5J-1-TP-M-DT

UPPER HEATER

POINT A BSTAGE



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)

A

AC

C

45

B

V1

Q2

A1266Y

C4104

R64.7K

R410K

C3473

C2473

1N4148D7 R7 4.7K R5 10K

4 AC

D10 D9

D11

1N4002X4

D85

-5V0V T

C5104

C6104

R22100K1/4W

47R10 330R9 4.7K

CN135313-0210

A

D.O.M

R1120K

12

B

POINT A BSTAGE

Door opened Open -5VDC

Doop closed Closed GND

NOTE : Check the state of the secondary interlock switch.

T=20ms (50Hz)

44

P.C.B CURCUIT DIAGRAM

4148

106

106

1266

1266

1266

106

106

106

106

4148

4148

4148

4148

4148

106

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



17 R CARBON FILM R23 1/4W, 10K OHM F RN-4Z1002F 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


46


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


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

47

PRINTED WIRING BOARD

1.CIRCUIT CHECK PROCEDURE (KOC-873T)1) Low voltage transformer (DMR-101FS) check.

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

2) Voltage Check

KMICOM PIN>

DISPLAY PIN

CHECK METHOD

Terminal

1-2

4-5

6-7

8-10

Voltage

230.0V

13.0V

35.0V

3.0V

1 4

56

78

102

NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of powersource 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-5V

0VT: 20 ms (50 Hz)

T0V

5VT=0.25us (4.0MHz)

PIN 1 & 25 2.6VAC (Display filament voltage)

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 troublein its segment or gril.

3 Loss vacumm in the display.

MEASUREMENT

Check the voltage of display pin 1 & 25

Refer to “The display trouble shootingdata” below

Find white spot.

RESULT REMEDY

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



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 A BSTAGE



POINT A BSTAGE



RY3G5G-1A-DT

MAGNETROND4

1N4148

-12VQ5 KRA 106M

BA

40

RY4CS11-12SH 1C 1P

TRAY MOTOR, LAMPD5

1N4148

-12VQ6 KRA 106M

BA

41

RY5CS11-12SH 1C 1P

FAN MOTORD6

1N4148

-12VQ7 KRA 106M

BA

42

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

RY6CS11-12SH 1C 1PLOWER HEATER

D71N4148

-12VQ8 KRA 106M

BA

43

POINT A BSTAGE



POINT A BSTAGE



RY2G5G-1A-DT

UPPER HEATERD3

1N4148

-12VQ4 KRA 106M

BA

39

POINT A BSTAGE



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)

A

AC

C

45

B

V1

Q1

A1266Y

C4104

R24.7K

R110K

C6473

C5473

1N4148 D1 R11 4.7K R10 10K

4 AC

D10 D9

D11

1N4004X4

D85

-5V0V T

C2104

C1104

R8100K1/4W

47R7 330R4 4.7K

CN135313-0210

A

D.O.M

R320K

12

B

POINT A BSTAGE

Door opened Open -5VDC

Doop closed Closed GND

NOTE : Check the state of the secondary interlock switch.

T=20ms (50Hz)

54

P.C.B CURCUIT DIAGRAM

R12

104R8

1/4W

100K

C9

104

RY

1G

5G-1

A-D

T

G5G

-1A

-DT

RY

2

SLO

W A

CT

ING

1N41

48D

2

D3

KR

A 1

06M

Q3

R9

3.3V

4.7

1/4W

2K 1

/4W

2K 1

/4W

V2

D7

UP

PE

R H

EA

TE

R

26 45 3

D5

TR

AY

MO

TO

R,L

AM

P

G5G

-1A

-DT

RY

3

UP

PE

R H

EA

TE

R

RY

4C

S11

-12S

H 1

C 1

P

MA

GN

ET

RO

ND

4

1N41

48

1N41

48

FA

N M

OT

OR

RY

5C

S11

-12S

H 1

C 1

P

RY

6C

S11

-12S

H-1

C 1

P

D6

1N41

48

1N41

48

2

DM

R-1

01F

S

1

3532

8-06

101C

N4

LVT

1

+35

VD

1154

D10

1N41

48 AC

-D

8D9 E

C4

1000

uF

- +

1N40

04A

x4

1N40

04A

7D12

86

EC

2C

12

R26 F2

R27

R30

50V

220u

F10

4

C1

C2

4.7K

R15

KR

A 1

06M

Q4

KR

A 1

06M

Q5

R19

KR

A 1

06M

Q6

KR

A 1

06M

Q7

104

1/4W

C7

R20

V1

1

1/4W

TH

ER

MIS

TO

R

BM

-20K

BZ

1

R21

R28

1K,1

/4W

V2

4.7K

10K

,1%

CN

2

31

PT

M-K

312-

D7

R4

D.O

.M S

W

3531

2-03

10

1K1/

4W

120K

,1%

1/4WR18

R16

330

V1

R7

-+

3531

3-02

10

ZD

410

4+

220u

FR

29

V2

KR

A 1

06M

Q8

C14

-E

C3

CN

1

2

A12

66Y

Q9

ZD

2

50V

27V

5.6V V3

1K 1/4W

510

104

104

10uF

R14

V1R3

20K

104

C13

EC

1

104

V1

C8

R5

50V

100

ZD

1

R6

1K

C3

Q2

A12

66Y

V1

: -

5V

V2

: -

12V

V3

: -

27V9 10

F1

ZD

34.7

V

ACA

1266

Y

R11

D1

C6

4374.7K

1N41

48R

10

R2

10K

R1

4.7K

C5

43710

KQ

1

V1

R17

V1

C4

104

10K

V1

10K

1/4W

SJ3

SJ1

SJ2

R13

10K

10K

CR

1KB

R-4

.0M

KS

TF

V1

20

c

4339

MB

8914

3

38IC1

4240 4125 2426

22 2123

egc

SV

M-5

MS

06D

P1

f

l

b G1

a

a

b

d

h

G1

CO

OK

+1m

in

PR

OG

RA

M

+10

sec

7

RG

LD7X

104J

BU

ZZ

1

21 2023 22 18 17 1619

61 60 47

131415

RA

1

65

6,8,

9,1115161819 17 1014

RG

LD7X

104J

RA

2V

3

4,75

RG

LD7X

104J

MO

DA

29

VS

SA

VS

S32 62

53 52

AV

R

VC

C

6364 28R

ST

X

5051

RA

3

2 4

B71

02M

V1

CA

1

86

ehi

jkgc

eeg

l

g

fb

l

a

e fc d

fb

l

a

G4

G2

f

G3

G3j

G2i

d

G4

d

j

egc

1

b f

l

a

l G5

F2

25

G5

d

k

F1

CN

3

ST

OP

/C

LEA

RG

RIL

L

10

ST

AR

T

PIE

1412

DE

FR

OS

T

CO

MB

I

TE

MP

M/W

CLO

CK

HLE

M15

S-1

1/4W

1/4W

1KR

22

45IN

T0

R23

49R

251K

10K

1/4W

48

5456 55

X0

30

10K

1/4W

R24

HLE

M15

R-1

CN

3V1

C11 V1104Z

5 31

V1C10

104Z

X1

31

SD

B16

1PV

B17

F

31 2

EN

101

- KOC-873T

55

P.C.B. LOCATION NO.


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


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







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



36 CONNECTOR FILM CN3 HLEM15S-1 4CW215SBD0 1

- KOC-873T

56


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


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

S/M NO. : C870T0S004

DAEWOO ELECTRONICS CO., LTD.686, AHYEON-DONG MAPO-GU SEOUL, KOREAC.P.O. BOX 8003 SEOUL, KOREATELEX: DWELEC K28177-8CABLE: “DAEWOOELEC”

PRINTED DATE: Apr, 2002

Documents

Service Manual - de-direct.co.uk · Service Manual Microwave Oven Model: KOC-870T0S KOC-870T5S KOC-873T0S KOC-873T5S DAEWOO ELECTRONICS CO., LTD. S/M No. : C870T0S004 ... (Only a