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Daewoo KOC-870T0S Service Manual

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Service Manual

Microwave Oven

Model: KOC-870T0S
KOC-875T0S
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).
DAEWOO ELECTRONICS CO., LTD.
S/M No. : C870T0S003

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Summary of Contents for Daewoo KOC-870T0S

  • Page 1: Microwave Oven

    : 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). DAEWOO ELECTRONICS CO., LTD.

  • Page 2: Table Of Contents

    PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE 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 and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

  • Page 3: Proper Use And Service Precautions

    PROPER USE AND SERVICE PRECAUTIONS 1. For Safe Operation Damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. IF ANY OF THE FOLLOWING CONDITIONS EXIST, OPERATOR MUST NOT USE THE APPLIANCE. (Only a trained service personnel should make repairs.) 1) A broken door hinge.

  • Page 4: Specifications

    SPECIFICATIONS MODEL KOC-870T0S KOC-870T5S 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...

  • Page 5: Names And Function Of Parts

    NAMES AND FUNCTION OF PARTS DEFROST GRILL COMBI WEIGHT TIME AUTO TEMP COOK COOK Grill Combi +1 min Temp +10 sec Auto Cook 1. Roast Beef 2. Roast Pork 3. Roast Chicken 4. Fish Fillets 5. Vegetable STOP/ START CLEAR Speedy Defrost Clock...

  • Page 6: Control Panel

    CONTROL PANEL When blinking, the oven is When blinking, the oven is operating in COMBI cooking. operating in WEIGHT DEFROST. When blinking, the oven is When blinking, the oven is operating in GRILL operating in TIME DEFROST. When blinking, the onve is operating in MICROWAVE COOK When blinking, the oven is...

  • Page 7: Operation

    OPERATION 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.

  • Page 8: Interlock Mechanism Functions And Adjustments

    INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS 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.
  • Page 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’...

  • Page 10: Precautions For Disassembly And Repair

    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 during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.

  • Page 11: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY 1. To remove cabinet. (Refer to Fig. 1) 1) Remove three screws on cabinet back. 2) Push the cabinet backward. Fig. 1 2. To remove guide wind assembly. (Refer to Fig. 2) 1) Release two screws ¤Ł . 2) Remove back-cover ¤Ø...
  • Page 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 Mognetron H.V. Copacitor H.V.Diode H.V. Trans H.V.Fuse...
  • Page 13 4. To remove magnetron. (Refer to Fig. 4) 1) Remove one screws ¤Ł which secure the magnetron ¤ . 2) Remove the magnetron. 3) Reverse the above steps for reassembly. Fig. 4 CAUTION : Never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage.
  • Page 14 CONTROL-PANEL 3516906000 BUTTON FUNCTION 3516905900 BUTTON FUNCTION KOR-816 3516905800 BUTTON START KOR-816 3516906100 BUTTON FUNCTION PKBPMSQ200 PCB SUB AS KOC-970T1S PKMPMSP700 KOC-870T0S KOC-870T0S PCB MAIN AS PKMPMSP720 KOC-870T5S KOC-870T5S 7121030811 SCREW TAPPING T2S PAN 3X8 MFZN 3513403810 KNOB VOLUME KOR-816...
  • Page 15  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) 6. To remove door assembly. (Refer to Fig. 7) 1) Remove two screws 1 which secure to hinge.
  • Page 16 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.
  • Page 17 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.
  • Page 18 10. To remove grill heater assembly. (Refer to Fig. 10) 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.

  • Page 19: Trouble Shooting Guide

    TROUBLE SHOOTING GUIDE 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.
  • Page 20 Condition Check Result Cause Remedy Outlet has Check Defective magnetron Replace proper voltage. continuitymagnetron Continuity Fuse does not blow. Check continuity of Defective line filter Replace noise filter board Continuity board Check continuity of Open power supply Adjust. Continuity cord power supply cord Defective touch control Normal...
  • Page 21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy No microwave Check continuity of oscillation high voltage fuse Continuity Replace high voltage fuse Check continuity of Defective high Replace Continuity high voltage capacitor voltage transformer terminals with wires removed Check continuity of...
  • Page 22 (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. Condition Check Result Cause Remedy Turn table motor, and Check continuity Malfunction of Adjust or oven lamp do not turn on of primary Primary interlock...
  • Page 23 (TROUBLE 6) The following visual conditions indicate a probable defective touch control circuit or membrance switch assembly 11. Incomplete segments, (A) Segments missing. (B) Partical segments missing. (C) Digit flickering other than normal fluorescent slight DEFROST flickering. M/W GRILL COMBI WEIGHT TIME (D) ¡...
  • Page 24 BUTTON KEYBOARD CHECK PROCEDURE 1. Type of encoding and button names. SW101 SW109 SW104 GRILL STOP/ CLEAR SW107 SW108 SW111 AUTO START DEFROST COOK SW103 SW102 SW110 +min COMBI SW106 SW105 SW112 +10sec TEMP CLOCK RA3 RGLD7X104J CA1 B7102M 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.

  • Page 25: Measurement

    MEASUREMENT 1. Microwave Output Power CAUTION : 1-1. Standard Method 1. Water load should be measured exactly to 1 liter. Microwave output power can be checked by indirectly 2. Input power voltage should be exactly volts as measuring the temperature rise of a certain amount of water specified.
  • Page 26 2-2. Judgement 3-3. Procedures The value of resistance should be applied to the value 1) Prepare 600cc glass or plastic container. specified below. 2) Pour 275 ¡ 15 milliliters of tap water initially at 68¡ 9 ¢ (20 ¡ 5 ¡ ) in the container. Door Open Closed...

  • Page 27: Component Test Procedure

    COMPONENT TEST PROCEDURE 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).

  • Page 28: Wiring Diagram

    WIRING DIAGRAM...

  • Page 29: Schematic Diagram

    SCHEMATIC DIAGRAM IDLE CONDITION MICROWAVE COOKING CONDITION...
  • Page 30 GRILL COOKING CONDITION COMBI COOKING CONDITION...
  • Page 31 CONVECTION COOKING CONDITION...

  • Page 32: Exploded Views And Parts List

    In this Service Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the EXPLODED VIEWS AND PARTS LIST latest parts information, please refer to PPL(Parts Price List) in Service information Center(http://svc.dwe.co.kr) NAME SPECIFICATION PART CODE Q'TY CAVITY AS KOC-870T0S 3516108630 REAR-PLATE *0 SBHG-1 T0.6 3516503900 DOOR AS KOC-870T0S 3511708840...

  • Page 33: Printed Wiring Board

    PRINTED WIRING BOARD 1.CIRCUIT CHECK PROCEDURE 1) Low voltage transformer (DMR-101FS) check. The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230VAC/50Hz Terminal Voltage 230.0V 13.0V 35.0V 8-10 3.0V NOTE 1 : Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source voltage.
  • Page 34 3) Display problems CAUSE MEASUREMENT RESULT REMEDY Poor contact between P.C.B. Check the voltage of display pin 2.6VAC Fix the pin 1 & 25 on and display filament. 1 & 25 the P.C.B. The display has some trouble Refer to “The display trouble shooting Replace P.C.B.
  • Page 35 Fig. 18 Measurement Point...
  • Page 37 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. Q7 KRA106M G5J-1-TP-M-DT MAGNETRON 1N4148...
  • Page 38 CHECK METHOD POINT STAGE RY5 “ON” -5VDC RY5 “OFF” -12VDC 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.
  • Page 39 7) When the door is opened during operation, the count down timer does not stop. R9 4.7K R10 330 D.O.M 100K 35313-0210 1/4W CHECK METHOD POINT STAGE Door opened Open -5VDC Doop closed Closed NOTE : Check the state of the secondary interlock switch. 8) When “...

  • Page 40: Circuit Diagram

    P.C.B CURCUIT DIAGRAM...

  • Page 41: P.c.b. Location No

    P.C.B. LOCATION NO. SYMBOL SYMBOL SPECIFICATION PART CODE Q’TY REMARK PCB MAIN M208 92X195 3514314920 TRANS POWER LVT1 DMR-101FS 5EPV041351 HOLDER VFD 3513002600 R CARBON FILM 1/4W, 4.7K OHM J RD-4Z472J- R CARBON FILM 1/4W, 100K OHM J RD-4Z104J- R CARBON FILM R13,18,21 1/4W, 10K OHM J RN-4Z103J-...
  • Page 42  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) SYMBOL SYMBOL SPECIFICATION PART CODE...
  • Page 43 DAEWOO ELECTRONICS CO., LTD. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” FAX: 02) 360-8184 TEL: 02) 360-8183 E-mail : G7F00E@web.dwe.co.kr S/M NO. : C870T0S003 PRINTED DATE: Nov. 1999...

This manual is also suitable for:

Koc-875t0sKoc-870t5sKoc-873t0sKoc-873t5s

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