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Daewoo KQG-8A6K5S Service Manual

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S/M No. :
Service Manual

Microwave Oven

Model: KQG-8A6K5S
✔
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).
Feb. 2013

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Summary of Contents for Daewoo KQG-8A6K5S

  • Page 1: Microwave Oven

    S/M No. : Service Manual Microwave Oven Model: KQG-8A6K5S ✔ 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: 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: Safety Andprecautions

    SAFETY AND 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 POWER SUPPLY 230V AC 50Hz, SINGLE PHASE WITH EARTHING MICROWAVE 1200 W POWER GRILL 1050 W CONSUMPTION COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 800 W MICROWAVE FREQUENCY 2450 MHz OUTSIDE DIMENSIONS (W x H x D) 465 x 287 x 347 mm CAVITY DIMENSIONS (W x H x D) 298 x 230 x 330 mm CAVITY VOLUME...

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION...
  • Page 6 2. FEATURES DIAGRAM 1 Door hook - When the door is closed, it will 8 Roller guide - Supports the glass cooking tray. automatically lock shut. If door is opened while 9 Coupler - This fits over the shaft in the center of oven is operating, magnetron tube will immedi- ately stop operating.
  • Page 7 3. CONTROL PANEL 1 Display - Cooking time, power level, indicators 6 Stop/Clear - Used to stop operation the oven or are displayed. to delete the cooking data. 2 Quick Defrost - Used to defrost foods very 7 Auto Defrost - Used to defrost foods. quickly (for weight defrost) 3 Time Set Pad - Used to set the cooking time and...

  • Page 8: Installation

    • This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type. Such a cable can be purchased from DAEWOO and must be installed by a qualified person. 6. Examine the oven after unpacking for any damage such as: A misaligned door, broken door or a dent in cavity.

  • Page 9: Operations And Functions

    OPERATIONS AND FUNCTIONS 11. Connect the mains lead to an electrical outlet. 12. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray must always be in place during cooking. 13.

  • Page 10: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY Cautions to be observed when troubleshooting. 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.
  • Page 11 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Pull the cabinet backward. 2. To remove door assembly 1) Remove two screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly.
  • Page 12 3. To remove door parts. REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3511719500 DOOR PAINTING AS KOR-6C0B5S 3517002800 BARRIER-SCREEN *I POLYESTER T0.1 3513100750 HOOK 3515102000 SPRING HOOK 3512210280 FRAME DOOR ABS SG-0760D SG-175 COATING 3517009930 BARRIER-SCREEN *O ABS UT-0510 SMOG 3512606870 HANDLE DOOR ABS SG-0760D SG-175 COATING...
  • Page 13 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part A • Loosen two screws on the stopper hinge top, and then push the door to contact the door seal to the oven front surface.
  • Page 14 SCREW TAPPING T2S PAN 3X10 PW MFZN PKMPMSZXR0 PCB MAIN MANUAL AS KQG-8A6K5S(SMPS MODULE) 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
  • Page 15 6. To remove high voltage capacitor. 1) Remove the screw which secure the grounding ring terminal of the H.V. diode and the capacitor holder. 2) Remove the H.V. diode from the capacitor holder. 3) Reverse the above steps for reassembly. ◆...
  • Page 16 8. To remove wind guide assembly. 1) Remove the screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove the screw which secure the wind guide assembly. 4) Draw forward the wind guide assembly. 5) Pull the fan from the motor shaft. 6) Remove two screws which secure the motor shaded pole.
  • Page 17 10. To remove tray motor. 1) Remove the coupler in the cavity. 2) Turn the set upside down. 3) Cut the tray motor cover part from the base plate. 4) Remove the tray motor cover. 5) Remove a screw which secure the tray motor. 6) Remove the tray motor.

  • Page 18: Interlock Mechanism And Adjustment

    INTERLOCK MECHANISM AND ADJUSTMENT The door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. Primary interlock switch...

  • Page 19: Troubleshooting Guide

    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 lead wire from these parts and check continuity with the AC plug removed.
  • Page 20 CONDITION CHECK RESULT CAUSE REMEDY Replace Defective mag- Outlet has Check continuity of magnetron Continuity netron proper volt- age Fuse does not Replace Defective line filter blow. Check continuity of Continuity board noise filter board Replace Check continuity of Open power sup- Continuity ply cord power supply cord...
  • Page 21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity microwave Check continuity of high oscillation voltage fuse Replace high voltage fuse Continuity Replace Check continuity of high Defective high voltage capacitor terminals voltage trans- with wires removed former Continuity in...
  • Page 22 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit or membrane switch assembly. 1. Incomplete segments (1) Segments missing (2) Partical segments missing (3) Digit flickering other than normal display slight flickering (4) “ :0” does not display when power is on. 2.

  • Page 23: Measurement And Test

    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. 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 1000±5cc of potable water.
  • Page 24 2. MICROWAVE RADIATION TEST CAUTION : 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 25 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 26: Wiring Diagram

    WIRING DIAGRAM...

  • Page 27: Printed Circuit Board

    PRINTED CIRCUIT BOARD 1. 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 NO LOAD 5-6-7 AC 12.6 V AC 14.7 V NOTE 1.
  • Page 28 Measure Point...
  • Page 29 3. WHEN THERE IS NO MICROWAVE OSCILLATION 1) When touching START pad, oven lamp does not turn on. Fan motor does not rotate, but cook indicator in display comes on. R18 4.7K (TRAY 1N4148 LAMP) KTC3198GR - Check method POINT STATE RELAY 2 ON 5VDC...
  • Page 30 - Check method POINT STATE 1) DOOR OPEN OPEN 5VDC 2) DOOR CLOSED CLOSE CHECK NO HETHOD REMEDY Check the stage(ON, OFF) of the door open monitor Replace door open monitor switch. switch by resistance measurement. 5. When the digital clock does not operate properly. →...

  • Page 31: Pcb Circuit Diagram

    2. P.C.B. CIRCUIT DIAGRAM...
  • Page 32 ✔ 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). 3. P.C.B. LOCATION NO. *MAIN PCB ASS'Y(M346) NAME SYMBOL...

  • Page 33: Exploded View And Parts List

    EXPLODED VIEW AND PARTS LIST 1. DOOR ASSEMBLY Refer to Disassembly and assembly. 2. CONTROL PANEL ASSEMBLY Refer to Disassembly and assembly. 3. TOTAL ASSEMBLY...
  • Page 34 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). REF. NO PART CODE PART NAME DESCRIPTION Q'TY 3511725250 DOOR AS KOR-8A6KKS PKCPSWGCB0 CONTROL-PANEL AS KQG-8A6K5S 3510805340 CABINET AS KQG-8A0R5S LOUVER 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 3516119500 CAVITY AS KQG-8A0R5S 3511413700 COVER REAR SBHG T0.4...
  • Page 35 ✔ 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 36 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: Feb. 2013...
  • Page 37 ABOUT THIS MANUAL ABOUT THIS MANUAL...

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