LG MC-9283JR Service Manual
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MICROWAVE OVEN

SERVICE MANUAL
MODEL: MC-9283JR
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website http://biz.lgservice.com

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Summary of Contents for LG MC-9283JR

  • Page 1: Microwave Oven

    Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MC-9283JR 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 EXCESSIVE MICROWAVE ENERGY...
  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...
  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION MODEL MC-9283JR Power Requirement 230 / 240 V ~ 50 Hz Single phase, 3 wire grounded Microwave 1,350W Grill 1,350W Combination 1,700W Convection 1,700W Power Output 900 Watts full microwave power (IEC60705) Microwave Frequency 2,450 MHz Magnetron...
  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection.
  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a 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 Control Panel ROTISSERIE-BAR Safety Door Lock System Turntable Rotating Ring ROTISSERIE-HANDLE High Rack Low Rack Metal Tray CONTROL PANEL 1. DISPLAY WINDOW: Used to show time of day, cooking of power level, cooking category. 2.
  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 5. COMBINATION COOKING during oven operation. To Grill Combi 1. SETTING THE CLOCK Desired Function Stop/Clear Start Combi-1 cooking time Desired Stop/Clear Clock hour To Convection Combi Desired Desired convection Stop/ Function Start...
  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...
  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION power of microwave oven as POWER LEVEL. GENERAL DETAILS (refer to page 1-1) • The low voltage transformer supplies the necessary • One complete cycle of relay 2 is 22 seconds. voltage to the micom controller when power cord is plugged in.
  • Page 11: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER(VOLTS-DC, AC., Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •...
  • Page 12: Record Keeping And Notification After Measurement

    MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.
  • Page 13: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula: operated at its maximum microwave power setting 4187 X (∆T) + 0.88 X (T ) X M with a load of (1000 ±...
  • Page 14 D. DOOR GROSS ASSEMBLY REMOVAL F. AIR DUCT ASSEMBLY REMOVAL 1) Open the door. 1) Disconnect the leadwire from lamp and MGT 2) Remove the choke cover very carefully with a flat- thermostat. blade screwdriver. 2) Remove the mounting screw to the magnetron. CAUTION : Be careful not to damage door seal plate by screwdriver.
  • Page 15: Diode Removal

    H. FAN MOTOR ASSEMBLY REMOVAL J. THE TURNTABLE MOTOR REMOVAL 1) Remove the turntable. 1) Discharge the high voltage capacitor. 2) Remove the turntable shaft VERY CAREFULLY 2) Disconnect the leadwire from fan motor, noise filter with a slotted screwdriver. and high voltage capacitor.
  • Page 16 K. C-MOTOR, THERMISTOR AND SHEATH HEATER REMOVAL 1) Remove the two screws securing the cover assembly to the oven cavity. 2) Disconnect the leadwire from the circulation motor terminal and the sheath heater. 3) Remove the screws of the thermistor, guide assy- chamber and lift up the guide assy-chamber.
  • Page 17: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B.
  • Page 18: Component Test Procedure

    COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER 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 19: Test Procedure

    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. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000)
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS FUSE Check for continuity of the fuse with an Normal Abnormal 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 21 COMPONENTS TEST PROCEDURE RESULTS Disconnect the 8 pin Check for P.C.B. connector. Cooking Start connector from P.C.B. (Refer to schemetic diagram) Cooking Start RELAY 2, RELAY 3 Relay 3 OF P.C.B. (Wire leads removed.) Note: Relay Relay 1 Relay 1: Fan motor Turntable motor Oven lamp Relay 2: Microwave...
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS CIRCULATION MOTOR Normal : COM-230V : Approx. 150 Ω (Wire leads removed) Abnormal : Infinite or several ohm. 230V(BL) NOTE: (YL) ) = WIRE COLOR Cooking Start RELAY 4, 6 OF P.C.B (Disconnect the 9 pin connector from P.C.B) See Schematic Dagram on page 4-3)
  • Page 23: Trouble Shooting

    TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 24 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 25 (TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Replace primary Malfunction of the Check continuity 1. Fuse blows. Continuity. and monitor monitor switch. of monitor switches.
  • Page 26 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1.Setting time does No continuity. secondary switch. secondary switch.
  • Page 27 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Disconnect the Defective P.C.B Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 2 and check continuity Continuity.
  • Page 28 (TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION CHECK RESULT CAUSE REMEDY Output is full when Defective P.C.B. Replace P.C.B. Disconnect the Abnormal. you set lower assembly. assembly. wire leads from power level.
  • Page 29: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 30: Door Parts

    DOOR PARTS 15006A 13536A 13552A 13581A 13213A 14890A 13720D 14026A WTP027 14970A 13650A...
  • Page 31: Control Panel Parts

    CONTROL PANEL PARTS 24781M 268711 WTP015 268712 23790D 23572A 250201 WTP004 249401 250202...
  • Page 32: Oven Cavity Parts

    OVEN CAVITY PARTS WTT021 33112U WTT021 35264A 348102 35300A 35301A WMT002 33550H 348101 WTT010 35026C 35026G 36549R WTP013 34810R 34960A 34370Z 33390M 33390G WTT011 WTT011 33052M 35889A 33301R 33301L 34270A 34370T 34271A 34930R 36549S WTT011 33650T WTP013...
  • Page 33: Latch Board Parts

    LATCH BOARD PARTS 43501A 466001 43500A 466003 44510A WSZ085 466001 WTT028 53550L 56912B 55262A WTT028...
  • Page 34: Interior Parts

    INTERIOR PARTS 568772 33808A WSZ002 WTT022 WTT021 56411A 53504A 56322A 568771 53300G WTT022 55300S 54810S 55900C 348105 36549C 348104 55900N WWP008 WNH002 WNH003 WSZ059 WWS005 WMT002 54350S 50FZZA 348103 349801 56208A WTT028 56201A 56549F WSZ002 55900A WTT037 54974S 54620A WTP002 56851D 56930M 50CZZH...
  • Page 35 BASE PLATE PARTS 56170D 63303A 63302A WTT021 65006B WSZ002...
  • Page 36: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...
  • Page 37: Printed Circuit Board

    PRINTED CIRCUIT BOARD...
  • Page 38 Jan., 2004 P/NO : 3828W5S3477 Printed in Korea...

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