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Service Manual
Microwave Oven
Model: KOG-86AR7S
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 CORP.
http : //svc.dwe.co.kr
S/M No. : G86AR7S001
Aug. 2004
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Table of Contents
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Summary of Contents for Daewoo KOG-86AR7S
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Page 1: Microwave Oven
S/M No. : G86AR7S001 Service Manual Microwave Oven Model: KOG-86AR7S 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 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 KOG-86AR7S POWER SUPPLY 230V~50Hz, SINGLE PHASE WITH GROUNDING MICROWAVE 1350W POWER GRILL 1050W CONSUMPTION COMBINATION 2350W MICROWAVE ENERGY OUTPUT 900W MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS (W X H X D) 495 x 294 x 394 mm (19.5 x 11.6 x 15.5 in) 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... -
Page 6: Feature Diagram
2. FEATURE DIAGRAM 1 DOOR SEAL - Door seal maintains the microwave 8 GLASS COOKING TRAY - Made of special heat within the oven cavity and prevents microwave leakage. resistant glass. The tray must always be in proper position before operating. Do not cook food directly on 2 DOOR HOOK - When the door is closed, it will the tray. -
Page 7: Control Panel
3. CONTROL PANEL 1 Display - Cooking time, power level, indicators and 5 Clock - Used to set clock. present time are displayed. 6 Start/Express cook - Used to start the oven operation 2 Auto cook - Used to cook using a program or to and also increase the reheat time by 30 seconds. -
Page 8: 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 9: 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 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 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 11 1. To remove cabinet 1) Remove three screws on cabinet back. 2) Pull the cabinet backward. 2. To remove door assembly 1) Remove a screw which secure the stopper hinge top. 2) Remove the door assembly from top plate of cavity. 3) Reverse the above for reassembly.
- Page 12 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). 3. To remove door parts. REF NO.
- 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 a screw on stopper hinge top, and then push the door to contact the door seal to oven front surface.
- Page 14 ABS SG-175 SG-0760D 3516911730 BUTTON FUNCTION-A ABS SG-175 SG-0760D SPRAY PKBPMSA600 PCB BUTTON MANUAL AS KOR-86AR7S PKMPMSA620 PCB MAIN MANUAL AS KOG-86AR7S 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 7621301011 SCREW TAPPING T2 PAN 3X10 PW MFZN 3516913000 BUTTON FUNCTI0N-C...
- Page 15 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 16 8. To remove wind guide assembly. 1) Remove a 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 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.
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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. Condition : DOOR CLOSED Condition : DOOR OPEN (1) 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 Outlet has Check continuity of Defective magnetron Replace proper voltage. magnetron Continuity Fuse does not blow. Defective line filter Check continuity of Replace Continuity board noise filter board Open power supply Check continuity of Replace cord Continuity power supply cord...
- Page 21 (TROUBLE 3) No microwave oscillation even though fan motor rotates. Condition Check Result Cause Remedy Check continuity Continuity Defective high Replace microwave of high voltage voltage oscillation capacitor transformer terminals with wires removed Check continuity of Continuity in Defective high Replace high voltage diode voltage diode...
- Page 22 (TROUBLE 4) The following visual conditions indicate a probable defective touch control circuit assembly. 1. Incomplete segments (1) Segments missing (2) Partial segments missing (3) Digit flickering other than normal display slight flickering (4) :0 does not display when power is on. 2.
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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 29.5 V NOTE : 1. - Page 28 Measure Point...
- Page 29 3. When there is no microwave oscillation 1) When pressing START button, 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...
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Page 30: Pcb Circuit Diagram
2. PCB CIRCUIT DIAGRAM... -
Page 31: Assembly Part List
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. ASSEMBLY PART LIST NAME SYMBOL PART CODE... -
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 So, if you need the latest parts information, please refer to PPL(Parts Price List) in Service Information Center (http://svc.dwe.co.kr). PART CODE PART NAME DESCRIPTION Q'TY 3511715420 DOOR AS KOR-86AR7S PKCPSWA620 CONTROL-PANEL AS KOG-86AR7S 3510805400 CABINET AS KOR-81150S 7112401011 SCREW TAPPING T1 TRS 4*10 MFZN 7S627W50X1 NET HEX NUT FLANGE M5X0.8P MFZN 3516109910...
- 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. : G86AR7S001 PRINTED DATE: Aug. 2004...