LG GMS-7020MW Service Manual
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LG GMS-7020MW Service Manual

LG GMS-7020MW Service Manual

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This Owner's Manual is provided and hosted by Appliance Factory Parts.
GOLDSTAR GMS-7020MW
Owner's Manual
Shop genuine replacement parts for GOLDSTAR
GMS-7020MW
Find Your GOLDSTAR Microwave Parts - Select From 234 Models
-------- Manual continues below --------

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Summary of Contents for LG GMS-7020MW

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. GOLDSTAR GMS-7020MW Owner's Manual Shop genuine replacement parts for GOLDSTAR GMS-7020MW Find Your GOLDSTAR Microwave Parts - Select From 234 Models -------- Manual continues below --------...

  • Page 2: Microwave Oven

    MICROWAVE OVEN SERVICE MANUAL MODEL: GMS-7020MW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 3: 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 4: Table Of Contents

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

  • Page 5: Specifications

    SPECIFICATIONS ITEM DESCRIPTION GMS-7020MW MODEL 120 Volts AC 60 Hz Power Requirement 900 Watts (8.0 A) Single phase, 3-wire grounded 600 Watts full microwave power (IEC60705) Power Output 2,450 MHz Microwave Frequency 2M213 Magnetron 0 ~ 35 min. Timer ” (W) x 11 ”...

  • Page 6: 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 7: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with For personal safety, this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times.

  • Page 8: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Power Knob Timer Knob Safety Door Lock System Turntable Rotating Ring OPERATION CHECK After unpacking this appliance, examine the new 2. Place the glass tray inside the oven cavity. oven for evidence of shipping damage.

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION • A high voltage of approximately 2100 volts AC is GENERAL DETAILS generated in the secondary of the high voltage transformer which is increased by the action of the high • When the door is closed, the primary switch is ON, the voltage diode and charging of the high voltage secondary switch is ON, and the monitor switch opens capacitor.

  • 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: Measurement With Outer Case Removed

    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 with 4187 x (∆T) a load of (1000±5) g of potable water.
  • Page 14 D. TIMER MOTOR REMOVAL E. DOOR GROSS ASSEMBLY REMOVAL 1) Remove the control panel assembly from the 1) Open the door. cavity. (Refer to control panel assembly removal 2) Remove the choke cover very carefully with a on previous page.) flat-blade screwdriver.

  • Page 15: Fan Motor Assembly Removal

    F. HIGH VOLTAGE TRANSFORMER I. AIR DUCT ASSEMBLY REMOVAL REMOVAL 1) Disconnect the leadwire from lamp. 2) Remove the mounting screw to Latch Board. 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from magnetron, high voltage transformer, and capacitor. J.

  • Page 16: Removing The Turntable Motor

    K. REMOVING THE TURNTABLE MOTOR L. INTERLOCK SYSTEM 1) Remove the turntable. 1) INTERLOCK MECHANISM 2) Remove the turntable shaft VERY CAREFULLY The door lock mechanism is a device which has with a slotted screwdriver. been specially designed to eliminate completely 3) Lay the unit down on its back.

  • Page 17: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. ALL THESE SWITCHES MUST BE REPLACED AT THE SAME TIME. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH TYPE NO.

  • 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: High Voltage Capacitor

    COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament 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) several ohms, and...
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of relay 2 with an RELAY 2 POWER ohm-meter. LEVEL (Remove wire leads from relay 2 and operate the unit.) 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec Relay 1 10 sec 12 sec 12 sec...

  • Page 21: Troubleshooting

    TROUBLESHOOTING 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 22 (TROUBLE 1) Oven does not operate at all and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Check continuity Replace fuse, 1. Fuse blows. Continuity. monitor switch. of monitor primary, monitor, switch (with secondary door closed). switches.
  • Page 23 (TROUBLE 2) Oven seems to be operating but little heat is produced in oven load. CONDITION CHECK RESULT CAUSE REMEDY Lower than 90% of Decrease in power Suggest customer Output is low Check the rating voltage. source voltage contact local power source with load.
  • Page 24 (TROUBLE 3) No microwave oscillation even though oven lamp and fan motor run. CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective timer Replace timer Check the timer No continuity. oscillation. motor. motor. switch of timer motor.(cooking state) Continuity. Check high vol- Defective high Replace high Abnormal...

  • Page 25: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...

  • Page 26: Door Parts

    DOOR PARTS 13581A 13552A 13536A 13213A 13352A 13720D 14026A 14970A...

  • Page 27: Controller Parts

    CONTROLLER PARTS 24781T 26549T 23572A 249402 WTT028 249401...

  • Page 28: Oven Cavity Parts

    OVEN CAVITY PARTS WTT021 33112U 948502 WTT010 33390G 33052A 35889A 36549S WTP013...

  • Page 29: Latch Board Parts

    LATCH BOARD PARTS 466001 466003 466001 43500A WSZ085 44510A...

  • Page 30: Interior Parts

    INTERIOR PARTS 56411A 56930V WSZ002 WSZ002 56201B 56324A 50FZZA WSZ002 56201A WTT037 56549F 55900A 54974S 56912B 568771 55262A...

  • Page 31: Base Plate Parts

    BASE PLATE PARTS WTT028 56170D 54810C 63303A 50CZZH 56851D 63302A 65006B WTT021 WSZ002...
  • Page 32 July, 2002 P/NO : 3828W5S2326 Printed in Korea...

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