1. Manuals
  2. Brands
  3. Daewoo Manuals
  4. Microwave Oven
  5. KQG-868G7S
  6. Service manual

Daewoo KQG-868G7S Service Manual

Hide thumbs Also See for KQG-868G7S:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Operating Instructions & Cook Book
S/M No. : KQG868G7S1
Service Manual

Microwave Oven

Model: KQG-868G7S
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
DAEWOO ELECTRONICS CORP.
May. 2004

Advertisement

Table of Contents
loading

Related Manuals for Daewoo KQG-868G7S

Summary of Contents for Daewoo KQG-868G7S

  • Page 1: Microwave Oven

    S/M No. : KQG868G7S1 Service Manual Microwave Oven Model: KQG-868G7S 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 DAEWOO ELECTRONICS CORP.

  • 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 And Precautions

    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 MODEL KQG-868G7S POWER SUPPLY 230V 50Hz 12A, SINGLE PHASE WITH EARTHING MICROWAVE 1350 W POWER CONSUMPTION GRILL 1050 W COMBINATION 2200 W MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 495 x 294 x 394 mm CAVITY DIMENSIONS (W X H X D) 320 x 237 x 343 mm (12.6 x 9.3 x 13.5 in.)

  • Page 5: External View

    EXTERNAL VIEW 1. OUTER DIMENSION 2. FEATURE DIAGRAM 1 Door seal - Door seal maintains the microwave energy 8 Roller guide - This must always be used for cooking within the oven cavity and prevents microwave leakage. together with the glass cooking tray. 2 Cover Heater 9 Glass cooking tray - Made of special heat resistant glass.
  • Page 6 3. CONTROL PANEL 1 Display - Cooking time, power level, present time are 8 Frozen Pizza - Used to reheat frozen pizza. displayed. 9 Stop/Clear 2 Auto Cook - Used to cook using a program or to Used to stop the oven operation or to delete the cook- reheat.

  • Page 7: Installation

    This appliance is supplied with cable of special type, which, if samaged, 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 8: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the mains lead to an electrical socket-outlet. 2. After placing the food in a suitable utensil, open the oven door and put it on the glass turntable, Glass turntable must always be in place during cooking. 3.

  • Page 9: Disassembly And Assembly

    DISASSEMBLY AND ASSEMBLY Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safety 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 10 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Push the cabinet backward. 2. To remove door assembly 1) Remove a screws which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly.
  • Page 11 3. To remove door parts. REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512207900 FRAME DOOR ABS SG-175 SG-0760D 3516005720 SPEICAL DOUBLE TAPE TESA 4967 0.16T 35MM 0.78 3517008210 BARRIER-SCREEN *O ACRYL T1.5 SMOG 3515204100 STOPPER HINGE *T AS KOR-63150S 3511711800 DOOR PAINTING AS...
  • Page 12 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 stopper hinge top, and then push the door to contact the door seal to oven front surface.
  • Page 13 REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3516911300 BUTTON DOOR OPEN ABS SG-175 SG-0760D 3518571500 SWITCH MEMBRANE KQG-868G7S 441G430171 SPRING BUTTON SWP DIA. 0.7 3516729700 CONTROL-PANEL ABS SG-175 SG-0760D 3516911100 BUTTON FUNCTION-A ABS SG-175 SG-0760D PKMPMSA700 PCB MAIN MANUAL AS...
  • Page 14 6. To remove high voltage capacitor. 1) Remove a 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. High voltage circuit wiring 7.
  • Page 15 8. To remove wind guide assembly. 1) Remove a screw for earthing. 2) Remove the noise filter from the wind guide. 3) Remove a 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 16 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 17 12. To remove heater parts HEATER TOP ASSEMBLY : 3512803600 REF NO. PART CODE PART NAME DESCRIPTION Q’TY REMARK 3512765100 HARNESS HEATER KOC-970T1S TEFLON 7112401011 SCREW TAPPING T1 TRS 4X10 MFZN 3510607800 BRACKET HEATER *T SBHG T0.5 3512803700 HEATER MIRACLON 115V AC 500W 3511408100 COVER HEATER *T...

  • 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. (1) Primary interlock switch When the door is closed, the hook locks the oven door.

  • 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 Replace Defective Outlet has Check continuity of magnetron Continuity magnetron proper volt- age Fuse does not Replace blow. Defective line Check continuity of Continuity filter board noise filter board Replace Open power supply Check continuity of Continuity power supply cord cord...
  • Page 21 (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 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: Microwave Radiation Test

    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: 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 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 DC 12 V AC 30.5 V NOTE 1.
  • Page 29 3. When there is no microwave oscillation 1) When touching START button, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. Cause : RELAY 2 does not operate. refer to Circuit Diagram (point 3) - Check method POINT STATE...
  • Page 30 2. P.C.B. CIRCUIT DIAGRAM...
  • Page 31 3. P.C.B. LOCATION NO. NAME SYMBOL SPECIFICATION PART CODE Q'TY REMARK BUZZER BM-20K 3515600100 C ARRAY 7P(6) 1000PF M 50V CN6XB-102M CAPACITOR CERA 102 50V Z AXIAL CCZB1H102K CAPACITOR CERA C1~4,6,D6 104 50V Z AXIAL CCZF1H104Z CAPACITOR ELEC 50V RS 1MF CEXE1H109A CAPACITOR ELEC 25V RSS 1000MF...

  • Page 32: 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 33 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 PART CODE PART NAME DESCRIPTION Q'TY 3511725100 DOOR AS KQG-868G7S PKCPSWA700 CONTROL-PANEL AS KQG-868G7S 3512803600 HEATER *T AS KOG-57350S 3510805400...
  • Page 34 DAEWOO ELECTRONICS CORP. 686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: “DAEWOOELEC” S/M NO. : KQG868G7S1 PRINTED DATE: May. 2004...

Table of Contents