Related Manuals for LG MC-924JL
Summary of Contents for LG MC-924JL
- Page 1 MICROWAVE/GRILL CONVECTION OVEN SERVICE MANUAL MODEL : MC-924JL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Feb, 2001 Printed in Korea P/NO : 3828W5S1786...
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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 MODEL MC-924JL Power Requirement 230V AC 50Hz Single phase, 3 wire grounded Microwave ........1300W Grill..........1350W Convection ........1700W Combination........1700W Power Output 900W full microwave power(IEC705) Microwave Frequency 2,450MHz Magnetron 2M246, 2M248J Timer 99min. 50sec Outside Dimensions 574(W) X 378(H) X 508(D) -
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 Plate Window Door Screen Door Seal Display Window Grill rack Convection rack Control Panel Metal tray Glass tray Rotating ring Safety Interlock System Control Panel 1. MICRO POWER: To select micro power cooking and cooking power levels. 2.. -
Page 8: 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 9: Schematic Diagram
SCHEMATIC DIAGRAM... -
Page 10: 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 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 A Fully Assembled Oven
MEASUREMENT WITH THE OUTER NOTES WHEN MEASURING CASE REMOVED • Do not exceed meter full scale deflection. • When you replace the magnetron, measure microwave • The test probe must be removed no faster than, energy leakage before the out case is installed and 1 inch/sec (2.5 cm/sec) along the shaded area, after all necessary components are replaced or 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 operated at its maximum microwave power setting with 4187 X (∆T) 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 E. AIR DUCT ASSEMBLY REMOVAL F. MAGNETRON REMOVAL 1) Disconnect the leadwires from the lamp, micro switch, 1) Remove the mounting screw holding the magnetron damper motor, and damper switch. and air duct assembly. 2) Remove the screws holding the oven cavity and latch 2) Disconnect the leadwire from the magnetron.
- Page 16 G. 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 K. TURNTABLE MOTOR REMOVAL L. 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.
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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 : Approx. 160 Ω Measure the resistance. Abnormal : Infinite or several ohm. (Wire leads removed) (Multi-meter scale : R x 1) NOTE: ) = WIRE COLOR Measure the resistance. GRILL HEATER Normal : Approx. 200~300 Ω (Multi-meter scale : R x 1) (Wire leads removed) Abnormal : Infinite or several...
- Page 23 COMPONENTS TEST PROCEDURE RESULTS Cooking Start RELAY 3, 4, OF P.C.B (Disconnect the 9 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 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 membrane Defective flat cable 1 of key 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 CONDITION CHECK RESULT CAUSE REMEDY Defective Relay Replace Relay Check the Relay Convection indicator Abnormal 4 or 6. 4 or 6. 4 or 6 of P.C.B. light but oven does assembly . not go into cook cycle when START Normal...
- 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.
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Page 30: Exploded View
#EV# EXPLODED VIEW INTRODUCTION MODEL : MC-924JL OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 31: Door Parts
#EV# DOOR PARTS 15006A 13581A 13552A 13213A WTP013 14890A 13551A 14026A 14970A 13650A... -
Page 32: Control Panel Parts
#EV# CONTROL PANEL PARTS 24781M 268711 23551A 26638A WTP015... -
Page 33: Oven Cavity Parts
#EV# OVEN CAVITY PARTS WTT021 33112U WTT021 35264A 348102 35300A WMT002 35301A 33550H 348101 WTT020 35026C 35026G WSZ092 33052M 33390M 33390G 35889A 34370T 36549S WTP013... -
Page 34: Latch Board Parts
#EV# LATCH BOARD PARTS 43501A 466001 43500A 466003 44510A WSZ085 WTP013 WTT028 466001 56912B 53550L 36549W 56930V 54810U 55262A 466001 WTP007 WTT028... -
Page 35: Interior Parts
#EV# INTERIOR PARTS 568772 33808A 56411A WTT022 WTT021 WSZ002 53504A 56322A 53300G WTT022 55300S 54810S 55900C 348105 36549C 348103 55900N WTP015 WWP008 WNH002 50FZZA WNH003 WSZ059 WWS005 WMT002 54350S 56201A 348104 56208A 349801 WTT034 WTT028 54974S 56549F 55900A WSZ002 50CZZH 56324A 54810C 568771... -
Page 36: Base Plate Parts
#EV# BASE PLATE PARTS 56170D 63303A 63302A WTT021 65006B WSZ002... -
Page 37: Schematic Diagram Of P.c.b
SCHEMATIC DIAGRAM OF P.C.B... -
Page 38: Printed Circuit Board
PRINTED CIRCUIT BOARD...