Daewoo KQG-1N1AS Service Manual
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Daewoo KQG-1N1AS Service Manual

Daewoo KQG-1N1AS Service Manual

Microwave oven & grill
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S/M No. : G867T9A001
Service Manual
Microwave Oven & Grill
:
KQG-1N1AS
Model
• 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).
Oct. 2009

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Summary of Contents for Daewoo KQG-1N1AS

  • Page 1: Precautions To Be Observed Before And During Servicing To Avoid Possible Exposure To Excessive Microwae Energy

    S/M No. : G867T9A001 Service Manual Microwave Oven & Grill KQG-1N1AS Model • 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 microwave source, and make repairs if 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 CAUTION : This Device is to be Serviced Only by Properly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Safety Operation and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy. 1.

  • Page 4: Specifications

    SPECIFICATIONS MODEL KQG-1N1A9A52 POWER SUPPLY 120V~60HZ, SINGLE PHASE WITH EARTHING POWER MICROWAVE 1500 W CONSUMPTION GRILL 1050 W MICROWAVE ENERGY OUTPUT 1000 W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 515 x 304 x 375 mm (20.3 x 12.0 x 14.8 in.) CAVITY DIMENSIONS (W X H X D) 356 x 239 x 358 mm(14.0 x 9.4 x 14.1 in.) NET WEIGHT...

  • Page 5: Feature Diagram

    2. FEATURES DIAGRAM 1 Door latch - When the door is closed, it will 8 Waveguide cover - Protects the microwave outlet automatically shut off. If the door is opened while from splashes of cooking foods. the oven is operating, the magnetron will 9 Roller guide - This must always be used for automatically shut off.

  • Page 6: Control Panel

    3. CONTROL PANEL Def . Grill Timer/g AUTO COOK 1. Bread 2. Soup Auto 3. Baked potato Cook 4. Fresh Vegetable 5. Frozen vegetable Dinner Frozen Plate Pizza Popcorn Beverage AUTO DEFROST Meat Poultry Fish Power Defrost Grill Kitchen Timer Clock Stop Start...

  • Page 7: Installation

    INSTALLATION 1. Steady, flat location This microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only. 2. Leave space behind and side All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually, cause oven failure.

  • Page 8: Operations And Functions

    OPERATIONS AND FUNCTIONS 1. Connect the main lead to an electrical outlet. 2. 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. 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 safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible danger from a short circuit.
  • 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 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 11 3. To remove door parts. DOOR ASSEMBLY : 3511727430 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3517010820 BARRIER-SCREEN*O TEMP GLASS T3.2 MIRROR 3512210550 FRAME DOOR KOR-1N1A SILVER SPRAY 3515204120 STOPPER HINGE*T AS KOR-6L0B1A 3511727500 DOOR PAINTING AS KOR-1N0A9A 3517006000 BARRIER-SCREEN*I PE T1.0...
  • 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 the stopper hinge top, and then push the door to contact the door seal to the oven front surface.
  • Page 13 5. To remove control panel parts. C/PANEL ASSEMBLY : PKCPSWZZ50 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3518573450 SWITCH MEMBRANE KQG-1N1A9A52 3516737810 CONTROL-PANEL KOR-1N1H SPRAY PKMPMSZZ40 PCB MAIN MANUAL AS KQG-1N4A9A27 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 3513702710 LEVER DOOR OPEN 441G430171...
  • Page 14 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. High voltage circuit wiring 7.
  • Page 15 8. To remove wind guide assembly. 1) Remove the screw which secure the wind guide assembly. 2) Draw forward the wind guide assembly. 3) Pull the fan from the motor shaft. 4) Remove two screws which secure the motor shaded pole. 5) Remove 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 C01 C02 HEATER TOP ASSEMBLY : 3512807640 REF. NO PART CODE PART NAME DESCRIPTION Q'TY REMARK 3512765100 HARNESS HEATER KOC-970T1S TEFLON 7S312X40A1 SCREW TAPPING T1 TRS 4X10 SE MFZN 3510607800 BRACKET HEATER *T SBHG T0.5 3512808320 HEATER MIRACLON 60V AC, 500W, 240MM...

  • 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: 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 Outlet has Check continuity of Continuity noise filter board magnetron proper voltage Fuse does not Replace Open power Check continuity of blow. Continuity supply cord power supply cord Replace Normal Defective touch control circuit Replace Malfunction of Display do not shown...
  • Page 21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. CONDITION CHECK RESULT CAUSE REMEDY Continuity Replace Check continuity of high Defective high microwave voltage capacitor terminals voltage oscillation with wires removed transformer Continuity in Replace Check continuity of high voltage Defective high backward rectifier in forward and backward...
  • Page 22 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit 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: Mesurement 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. 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 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: 120V / Frequency: 60Hz Terminal Voltage LOAD NO LOAD 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. Cause : RELAY 2 does not operate. refer to Circuit Diagram (point 3) - Check method POINT STATE...

  • Page 30: Pcb Circuit Diagram

    2. PCB CIRCUIT DIAGRAM...

  • Page 31: Pcb Location No

    3. PCB LOCATION NO. NAME SYMBOL SPECIFICATION PART CODE Q’TY BUZZER BM-20K 3515600100 C ARRAY 7P(6) 1000PF M 50V CN6XB-102M CAPACITOR ELEC 50V RS 10uF CEXE1H100A CAPACITOR ELEC 25V RSS 1000MF CEXF1E102V CONNECTOR WAFER YW396-02V 3519150520 CONNECTOR WAFER FCZ 254-11 441M367160 CONNECTOR WAFER YW396-05AV...

  • 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 REF.NO PART CODE PART NAME DESCRIPTION Q'TY 3511727430 DOOR AS KOR-1N1A9S51 SPRAY PKCPSWZZ50 CONTROL-PANEL AS KQG-1N1A9A52 3510810520 CABINET AS PCM 0.5T SV1401C 3516004100 SPECIAL SCREW T1 TRS LR4 POLE 4X10 MFZN 3516120300 CAVITY AS KQG-1N1A9A52 3511408220 COVER INSULATOR *T SBHG T0.5 3518905900 THERMOSTAT OFF:75 ON:65 V #187...
  • Page 34 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: Oct. 2009...

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