Related Manuals for LG MC-805A
Summary of Contents for LG MC-805A
- Page 1 MICROWAVE/GRILL CONVECTION OVEN SERVICE MANUAL MODEL : MC-805A/MC-805AR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
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Page 2: Specifications
SPECIFICATIONS ITEM DESCRIPTION MODEL MC-805A/MC-805AR 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 90min. -
Page 3: Control Panel
OPERATING INSTRUCTIONS Features Oven front plate Window door screen Door seal FOR MC-805AR ONLY Control panel ROTISSERIE-BAR Shaft Latch Metal tray Glass tray Rotating ring ROTISSERIE-HANDLE Grill rack Convection rack Control Panel 1. CLOCK: To set the time of day. 2. -
Page 4: Operating Sequence
Operating Sequence The following is a description of component functions 6. COMBINATION COOKING during oven operation. Desired convection Stop/Clear temp C, 100 C~250 1. SETTING THE CLOCK Desired Grill Stop/Clear Clock hour Desired Desired power level Desired cooking Start Start minute (20%, 40% or 60%) time... -
Page 5: Schematic Diagram
SCHEMATIC DIAGRAM FOR MODEL:MC-805A FOR MODEL:MC-805AR... -
Page 6: Circuit Description
Circuit Description • As the door is opened, if the contact of primary switch • As the door is closed, the contact of MONITOR and relay 2 and/or secondary switch fail to open, the SWITCH opens. This switch creates the short circuit to 10A fuse opens due to the large current surge caused blow 10 A fuse during operation under abnormal by the monitor switch activation which in turn stops... -
Page 7: 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 8 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.
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Page 9: 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 X (∆T) + 0.88 X (T ) X M operated at its maximum microwave power setting with a load of (1000 ±... - Page 10 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 11 E. MAGNETRON REMOVAL 2. When replacing the magnetron, be sure to install the 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.
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Page 12: High Voltage Transformer Removal
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 13: Interlock System
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 14: 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 15: 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 16 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...
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Page 17: Heater Element
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 18 COMPONENTS TEST PROCEDURE RESULTS Normal : COM-230V : Approx. 150 Ω CIRCULATION MOTOR 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 Normal : Approx.
- Page 19 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...
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Page 20: Troubleshooting 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 21 (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 22 (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 membrane Defective flat cable 1 of key of P.C.B.
- Page 23 (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 24 (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 25 (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.
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Page 26: Exploded View
EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 27: Door Parts
DOOR PARTS 13581A 15006A 13552A 13213A 14890A 14026A 14970A 13806D 13720F... - Page 28 CONTROL PANEL ASSEMBLY PARTS 24781S 268711 268712 250202 23572A 250201 WTP015 23790D 249401 250204 250203...
- Page 29 OVEN CAVITY PARTS WTT021 33112U 54974A WTT021 34681R FOR MC-805AR ONLY WSZ092 348102 34810R 35300A 34370Z WTP013 WMT002 36549R 33550H 348101 35301A WTT010 349602 33052M 343501 35026C 35026G 34370T 33390M WSZ092 33390G 34930R 35889A WSZ092 34271A FOR MC-805AR ONLY 349601 34036W 33650T 36549S...
- Page 30 LATCH BOARD PARTS 43500A 466001 466003 WSZ085 44510A 466001 43501A...
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Page 31: Interior Parts
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 32: Base Plate Parts
BASE PLATE PARTS 56170D 63303A 63302A 948506 948505 WSZ062 WSZ002 647781 WTT030... -
Page 33: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B... -
Page 34: Printed Circuit Board
PRINTED CIRCUIT BOARD...