Daewoo KOC-9Q4T Service Manual
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Daewoo KOC-9Q4T Service Manual

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See also: Owner's Manual , User Manual
S/M No. :
Service Manual

Microwave Oven

Model:
KOC-9Q4T
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).
Mar. 2010

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Summary of Contents for Daewoo KOC-9Q4T

  • Page 1: Microwave Oven

    S/M No. : Service Manual Microwave Oven Model: KOC-9Q4T 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).

  • Page 2: Specifications

    FUNCTION SELECTIONS Microwave / Grill / Convection / Combination POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0.99 Cu. Ft * SPECIFICATION ARE SUBJECT TO CHANGE WITHOUT NOTICE. MODEL KOC-9Q4T POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1400W POWER GRILL 1250W...

  • Page 3: External View

    3. EXTERNAL VIEW 1. OUTER DIMENSION 1) KOC-9Q3T7S 2) KOC-9Q4T...

  • Page 4: Feature Diagram

    2. FEATURE DIAGRAM 11. DOOR HOOK Hook automatically locks and holds the door when the door shuts. If the door opens while the oven is operating, the oven will stop operating immediately. 12. DOOR SEAL Door seal prevents the microwave leakage from the oven cavity. 13.
  • Page 5 2) KOC-9Q4T 1 Display : Cooking time, power level, program indicators and present time are displayed. MW ( ): When blinking, the oven is operating in MICROWAVE COOK mode. Grill ( ): When blinking, the oven is operating in GRILL mode.

  • Page 6: Troubleshooting Guide

    8. TROUBLESHOOTING GUIDE Following the procedure below to check if the oven is defective or not. 1) Check grounding before trouble checking. 2) Be careful of the high voltage circuit. 3) Discharge the high voltage capacitor. 4) When checking the continuity of the switches, fuse or high voltage transformer, disconnect one load wire from these parts and check continuity with the AC plug removed.
  • Page 7 CONDITION CHECK RESULT CAUSE REMEDY Defective Outlet has Check continuity of Replace continuity magnetron. proper magnetron voltage fuse does not blow? Defective line Check continuity of noise filter Replace continuity filter board board Open power Check continuity of Replace continuity power supply cord supply cord Defective touch...
  • Page 8 TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Check continuity of Replace Defective continuity high voltage fuse microwave high voltage oscillation fuse No microwave oscillation Continuity Check continuity of Defective high voltage capacitor terminals high voltage with wires removed transformer...
  • Page 9 (TROUBLE 4) Grill heater (upper heater) is not heated; food will not become hot. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of Adjust or Check continuity of Main heater primary Interlock replace continuity primary interlock switch is not heated. switch Adjust or Check continuity of Malfunction of replace...
  • Page 10 (TROUBLE 6) The following visual conditions indicate a probable defective touch control Circuit or button P.C.B. assembly 1. Incomplete segments. 1) segment missing 2) partial segments missing 3) digit flickering other than normal fluorescent slight flickering 2. A distinct change in the brightness of one or more numbers exists in the display.

  • Page 11: Measurement And Test

    9. MEASUREMENT AND TEST 1. MEASUREMENT OF THE MICROWAVE POWER OUTPUT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. PROCEDURE 1. A cylindrical container of borosilicate glass is used for the test. It has a maximum thickness of 3mm, an external diameter of approximately 190mm and a height of approximately 90mm.

  • Page 12: Microwave Radiation Test

    2. MICROWAVE RADIATION TEST WARNING 1. Make sure to check the microwave leakage before and after repair of adjustment. 2. Always start measuring of an unknown field to assure safety for operating personnel from microwave energy. 3. Do not place your hands into any suspected microwave radiation field unless the safe density level is known. 4.

  • Page 13: Component Test Procedure

    3. COMPONENT TEST PROCEDURE • High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. • It is neither necessary nor advisable to attempt measurement of the high voltage. • Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor.

  • Page 14: Wiring Diagram

    10. WIRING DIAGRAM...

  • Page 15: Door Assembly

    1. DOOR ASSEMBLY Refer to 6. Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to 6. Disassembly and assembly. 3. TOTAL ASSEMBLY 2) KOC-9Q4T...
  • Page 16 Caution In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). REF. NO PART CODE PART NAME DESCRIPTION...
  • Page 17 Caution In this Manual, some parts can be changed for improving, their performance without notice in the parts list. So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). REF. NO PART CODE PART NAME DESCRIPTION...

  • Page 18: Printed Circuit Board

    12. PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE 1. Low voltage transformer check The low voltage transformer is located on the P.C.B. Measuring condition: Input voltage: 230V / Frequency: 50Hz Terminal Voltage(load) Voltage(no load) 7-8-9 DC 13.5 V AC 37 V NOTE 1.
  • Page 19 MEASUREPOINT...
  • Page 20 3. Case of no microwave oscillation 1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 1 does not operate. (MAGNETRON) 23 P12 22 P13 (LAMP,TRAY,FAN) (CONV.FAN) STATE POINT A...
  • Page 21 4. Case of no heating of top heater main. When touching GRILL or COMBI or CONVECTION button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *Cause: RELAY 3 does not operate. 24 P11 (GRILL) STATE...
  • Page 22 6. Case of no stopping of the count down timer When the door is opened during operation, the count down timer does not stop. Q6 A1266Y 1N4148 4.7K YW396-02V 104Z D.O.M SW - Check method POINT STATE DOOR OPEN OPEN +5V DC DOOR CLOSED CLOSE...

  • Page 23: Circuit Diagram

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

  • Page 24: Specification

    PCB ASS’Y PART LIST LOCATION PART CODE NAME SPECIFICATION Q'TY 3515600100 BUZZER BM-20K CN5XB-102M C ARRAY 6P(5) 1000PF M 50V CCZF1H473Z C CERA 50V HIKF 0.047uF Z C4,C6 CCZB1H102K C CERA 102K 50V AXIAL C1~3,C5,C8,C9 CCZF1H104Z C CERA 50V HIKF 0.1uF Z CEXE1H100A C ELECTRO 50V RSS 10MF...
  • Page 25 DAEWOO ELECTRONICS CORP. 1-2, Jeo-dong 1(il)-ga, Jung-gu, Seoul, Korea C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : PRINTED DATE: Mar. 2010...

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