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LG MC-806CLR Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MC-806CLR
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG MC-806CLR

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL: MC-806CLR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS 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. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ....................Inside front cover SPECIFICATIONS ............................1-1 CAUTIONS ..............................2-1 INSTALLATIONS ............................3-1 OPERATING INSTRUCTIONS ........................4-1 FEATURES ............................4-1 CONTROL PANEL ..........................4-1 OPERATING SEQUENCE ........................4-2 SCHEMATIC DIAGRAM ........................4-3 CIRCUIT DESCRIPTION ........................4-4 SERVICE INFORMATION .........................

  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION Power Requirement 230V AC50Hz Single phase, 3 wire grounded Microwave 1350W Grill 1250W Convection 1350W (MAX. 2550W) Combination 2650W Power Output 850W full microwave power(IEC705) Microwave Frequency 2,450MHz Magnetron 2M214 - 39F, 2M254J, 2M218J Timer 99min. 50sec. Outside Dimensions 530(W) X 322 X 500mm Cavity Dimensions...

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current appliance. Personnel should not be exposed to the microwave Though it is free from danger in ordinary use, energy which may radiate from the magnetron or extreme care should be taken during repair. other microwave generating device if it is improperly used or connected.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. Installing microwave oven Earthing Instructions 1. Empty the microwave oven and clean inside it with a This microwave oven is designed to be used in a fully soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS Features Oven front face Window door screen Door seal Control panel ROTISSERIE-BAR Shaft Latch Metal tray Glass turntable Rotating ring ROTISSERIE-HANDLE Grill rack Convection rack Control Panel 1. Grill: To select grill cooking. 2. MICRO POWER: To select micro power cooking and cooking power levels.

  • Page 8: Operating Sequence

    Operating Sequence The following is a description of component functions 6. Combination cooking during oven operation. Desired convection 1. Setting the clock Combination temp (100 C~250 Plug the power Set the cord into an Clock correct hour electric outlet Grill Set the correct Clock...

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    Circuit Description and relay 2 and/or secondary switch fail to open, the • As the door is closed, the contact of MONITOR 10A fuse opens due to the large current surge caused SWITCH opens. This switch creates the short circuit to by the monitor switch activation which in turn stops blow 10 A fuse during operation under abnormal magnetron, oscillation.

  • Page 11: Service Information

    SERVICE INFORMATION Tools and Measuring Instruments NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. Standard tools are listed below. • TESTER (VOLTS-DC, AC, Multmeter) • Diagonal pliers • Microwave survey meter • Long nose pliers —Holaday H1-1500, Hi-1501 •...
  • Page 12 MEASUREMENT WITH THE OUTER NOTES WHEN MEASURING CASE REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than, • When you replace the magnetron, measure microwave 1 inch/sec (2.5 cm/sec) along the shaded area, energy leakage before the out case is installed and otherwise a false reading may result.

  • Page 13: Measurement Of Microwave Power Output

    Measurement of Microwave Power Output • The microwave power output P in watts is calculated • Microwave power output measurement is made with from the following formula: the microwave oven supplied at its rated voltage and 4187 (DT) operated at its maximum microwave power setting with a load of (1000 ±...
  • Page 14 D. DOOR GROSS ASSEMBLY REMOVAL Remove door 1) Open the door. 2) Remove the choke cover cap very carefully with a flat- Door seal plate blade screwdriver. CAUTION : Be careful not to damage door seal plate with the screwdriver. 3) Lift up and push the door.
  • Page 15 2. When replacing the magnetron, be sure to install the E. MAGNETRON REMOVAL magnetron gasket in the correct position and be sure 1) Disconnect the leadwire from high voltage that the gasket is in good condition. transformer and high voltage capacitor. 3.
  • Page 16 F. NOISE FILTER ASS'Y HIGH VOLTAGE H.V. Transformer DIODE, HIGH VOLTAGE CAPACITOR, AND COOLING FAN MOTOR REMOVAL 1 ) Disconnect lead wires from the noise filter ass'y and remove screw securing the noise filter earth wire to the back plate. 2) Push two hook of the guide suction and lift up the rear of noise filter ass'y.
  • Page 17 J. TURNTABLE MOTOR REMOVAL K. INTERLOCK SYSTEM 1) Remove the turntable. 1) INTERLOCK MECHANISM The door lock mechanism is a device which has been 2) Remove the turntable shaft VERY CAREFULLY with specially designed to completely eliminate microwave a slotted screw driver. activity when the door is opened during cooking and 3) Lay the set down on its back.

  • Page 18: Interlock Continuity Test

    Interlock continuity Test WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION,REPLACE ONLY WITH IDENTICAL REPLACEMENT RARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY / SECONDARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH A. PRIMARY INTERLOCK SWITCH TEST B.

  • Page 19: Component Test Procedure

    Component Test Procedure CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUT CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament Terminals NOTE : When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. Measure the resistance. HIGH VOLTAGE Normal : Momentary indicates (Multi-meter scale : R x 1000) CAPACITOR...
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Normal Abnormal FUSE Check for continuity of the switch with a (Wire leads removed.) Multi-meter. NOTE : If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS CIRCULATION MOTOR Normal : COM-230V : Approx. 150 Ω Measure the resistance. COM-24V : Approx. 20 Ω (Wire leads removed) (Multi-meter scale : R x 1) Abnormal : Infinite or several ohm. (BN) 230V(BL) (YL) NOTE: ) = WIRE COLOR Measure the resistance.
  • Page 23 COMPONENTS TEST PROCEDURE RESULTS Cooking Start RELAY 3,4 OF P.C.B (Disconnect the 7 pin connector from P.C.B) See Schematic Dagram on page 9) Relay 3 Relay 4 Cooking Start RELAY 2,3,4 OF P.C.B (Wire leads removed.) RY2 : Microwave RY3 : Grill RY4 : Convection Relay 3 Relay 4 Relay 2 Check continuity between...

  • Page 24: Trouble Shooting Guide

    Trouble Shooting Guide CAUTIONS 1. Check grounding before checking for other trouble. 2. Be careful of the high voltage circuit. 3. When checking the continuity of the switches or transformer, disconnect one lead wire from these parts and then check continuity without turning the power source on. 4.
  • Page 25 (TROUBLE 2) Oven does not at all even thought MOTOR and P.C.B program. TEST PROCEDURE OR CONDITION CAUSE CORRECTION No input can be Defective tact switch key of Test procedure tact switch programmed. P.C.B. key of P.C.B. Some inputs can not be Loose connection.
  • Page 26 (TROUBLE 3) Oven does not operating microwave cooking TEST PROCEDURE OR CONDITION CAUSE CORRECTION Oven does not go into a Primary and secondary Test procedure primary and cook cycle when START key interlock switches defective secondary switches. is touched. or out of adjustment. Test procedure flat cable of Defective flat cable of P.C.B.
  • Page 27 (TROUBLE 3) Oven does not operating microwave cooking TEST PROCEDURE OR CONDITION CAUSE CORRECTION Test procedure relay 2 of No microwave oscillation. Defective relay 2 of P.C.B. P.C.B. Defective high voltage Test procedure high voltage transformer. transformer. Defective high voltage Test procedure high voltage capacitor.
  • Page 28 (TROUBLE 4) Oven does not operate convection cooking TEST PROCEDURE OR CONDITION CAUSE CORRECTION Defective circulation motor Check and repair C-Motor wire Convection indicator lights wire ass'y. ass'y. (COM:YL, 24V:BN, 230V:BL) but oven does not go into cook cycle when START key is touched.
  • Page 29 (TROUBLE 5) Oven does not operating Grill cooking TEST PROCEDURE OR CONDITION CAUSE CORRECTION Test procedure relay 3 of Grill indicator lights Defective relay 3 of P.C.B. P.C.B. but oven does not go into cook cycle when START key is touched. Open or loose wire Check and repair wiring.

  • Page 30: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 31 DOOR PARTS 13581A 15006A 13552A 13213A 14890A 13350F 14026A 14970A...
  • Page 32 CONTROL PANEL PARTS 24781S 268711 268712 23790D WTP004 250201 23550F 250202 24510L 250203 24970A...
  • Page 33 OVEN CAVITY PARTS WTT021 33112U 54974A WTT021 WSZ092 348102 34810R 35300A 34370Z WTP013 WMT002 36549R 33550H 348101 35301A 349602 WTT010 343501 33052M 35026C 35026G 34370T 33390M WSZ092 33390G 34930R 35889A 34271A 349601 34036W 33650T 36549S WTP013...
  • Page 34 LATCH BOARD PARTS 43500A 466001 466003 WSZ085 466002 43501A...
  • Page 35 INTERIOR PARTS 56322V 53551S 368771 56411A WTT021 WSZ062 948502 53504A WTT011 WTT021 54810S 54975G 56930V 35300S 36549C 543501 WNH002 55900N WWP008 WSZ002 50FZZA WWS005 56201A 56208A WNH003 55900C WMT002 54974S WTT037 WTT028 WTP002 56549F 55900A 56930M 54810A WSZ002 50CZZH 948503 56324A 54810C 568771...
  • Page 36 BASE PLATE PARTS 56170D 63303A 63302A 948502 948506 948505 WSZ062 WSZ002 647781 WTT030...

  • Page 37: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...

  • Page 38: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

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