LG LMV2053ST Service Manual
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LG LMV2053ST Service Manual

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삼
흥
정
판
MICROWAVE OVEN
SERVICE MANUAL
MODEL: LMV2053SB
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO: 3828W5S6298
LMV2053ST
LMV2053SW
http://us.lgservice.com
December, 2005
Printed in Korea

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  • Page 1 삼 흥 정 판 http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMV2053SB LMV2053ST LMV2053SW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. December, 2005 P/NO: 3828W5S6298 Printed in Korea...
  • Page 2 CAUTION WARNING TO SERVICE TECHNICIANS PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY a. Do not operate or allow the oven to be operated with the door open. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary;...

  • Page 3: Table Of Contents

    FOREWORD Read this Manual carefully.Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ........................Inside front page SPECIFICATIONS ..............................1-1 CAUTIONS ................................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption ........1700W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1100W (IEC60705) Frequency ............2450 MHz ± 50 MHz Power Supply .............120 VAC, 60 Hz Rated Current ............14.5 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling ..........Forced Air Cooling Rectification ............Rectification Voltage Double Half-Wave Door Sealing ............Choke System Safety Devices ...........Magnetron Thermostat: Open at 150 °C ±...

  • 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 connected.

  • Page 6: Installations

    INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of at least 20 amperes. B. Avoid placing the unit in a location where there is direct heat or splashing water.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS CONTROL PANEL...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. DISPLAY: The Display includes a clock and indicators to tell 16. CUSTOM SET: Touch this pad to change the oven’s default you time of day, cooking time setting, and cooking functions setting for sound, clock, display speed and defrost weight. selected.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM OVEN THERMOSTAT L.V.TRANSFORMER MAIN RELAY C/TOP LAMP HIGH RELAY M.G.T BK BL C/TOP LAMP THERMOSTAT LOW RELAY VENT FAN ON/OFF RELAY PRIMARY SCR1 SWITCH VENT FAN SECONDARY 5 LVL SWITCH TURNTABLE T.T.M ON/OFF RELAY POWER RELAY MONITOR SWITCH...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS A. Never operate the unit when it is empty. A. The safety systems incorporated in this model are: Operating the oven with no load may shorten the (1) Primary interlock switch life of the magnetron.

  • Page 12: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely repaired. If any of the following conditions exist, the unit must not be operated: A. SINCE NEARLY 4000 VOLTS EXISTS IN SOME (a) The door does not close firmly.

  • Page 13: Microwave Leakage Test

    MICROWAVE LEAKAGE TEST CAUTIONS EQUIPMENT- • Be sure to check microwave leakage prior to • TESTER (VOLTS-DC, AC, Ohmmeter) servicing the oven if the oven is operative prior to • Microwave survey meter servicing. - Holaday HI-1500 • The service personnel should inform the HI-1501 manufacturer, importer or assembler of any certified - Narda...

  • Page 14: Power Output Measurement

    MEASUREMENT WITH THE OUTSIDE CASE NOTE WHEN MEASURING REMOVED (1) Do not exceed meter full scale deflection. (2) The test probe must be removed no faster than (1) When you replace the magnetron, measure for 1 inch/sec (2.5cm/sec) along the shaded area, microwave energy leakage before the outer case otherwise a false reading may result.

  • Page 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 3 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WHEN RECONNECTING THE WIRE LEADS TO Circuit Board ANY PART, MAKE SURE THE WIRING CONNE- CTIONS AND LEAD COLORS ARE CORRECTLY MATCHED ACCORDING TO THE OVERALL CIR- CUIT DIAGRAM.
  • Page 16 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C. connector. and 7 to insert the F.P.C. connector. (1) Insert the F.P.C.
  • Page 17 B. REMOVING THE OUTSIDE CASE (Figure 8) (1) Remove the vent grille by removing two screws securing it to the outside case. (2) Remove two screws securing it to the air duct. (3) Remove the mounting plate by turning the screws (1 or 2 screws)securing it to the outside case.
  • Page 18 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9, 10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to Latch Board “ADJUSTMENT PROCEDURES” on page 7-12. Primary Latch Board Interlock Switch...
  • Page 19 D. REMOVING MAGNETRON • After replacing the magnetron, check for microwave energy leakage with a survey meter Check (Figures 11 and 12) microwave energy leakage must be below the limit (1) Remove the vent grille by loosening two screws. of 5 mW/cm .
  • Page 20 F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by removing two screws (1) When mounting the door assembly to the oven securing it to the outside case loosening. assembly, be sure to adjust the door assembly (2) Lift up and remove the door.
  • Page 21 (3) Carefully pull the ventilation motor ASS'Y out ofthe J. REMOVING THE TURNTABLE MOTOR microwave oven. (See Figure 18-b) (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. (Figure 19) (3) Remove the base plate by removing 8 screws securing it to the oven cavity.
  • Page 22 K. REPLACING THE HUMIDITY SENSOR (1) Remove the sensor by removing 1 screw securing it to the air duct. (See Figure 22) (2) Mount the new humidity sensor to the air duct. Figure 22 7-11...

  • Page 23: Interlock System

    INTERLOCK SYSTEM INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to completely eliminate microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. ADJUSTMENT PROCEDURES CHECK THE DOOR LATCH AND SWITCH To avoid possible exposure to microwave energy CLOSING.
  • Page 24 TEST THE LATCH AND SWITCH SEQUENCE (7) When you achieve the proper sequence of switches in Steps 5 and 6, tighten the latch board screws at that point. (5) Open the oven door slowly. Watch the door latch, the Secondary Switch, Release Rod and Lever TEST THE MICROWAVE ENERGY LEAKAGE on the switches to make sure they are zero to the body of the switches in the following sequence:...

  • Page 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click Disconnect the wire lead from the secondary should be heard at the same time or successively switch. at intervals and the latches should activate the Connect the ohmmeter leads to the common switches with an audible click (COM)and normally open (NO)terminals of the...

  • Page 26: Test And Checkout Procedures And Troubleshooting

    TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING 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 LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2.
  • Page 27 COMPONENTS TEST RESULTS 1. Remove wire leads. CAPACITOR 2. Measure resistance. (ohm meter scale: Rx1000) • Terminal to terminal Normal: Momentarily indicates several ohms, and then gradually returns to infinite • Terminal to case Normal: Infinite. 1. Measure continuity. Forward. Normal: Continuity.
  • Page 28 COMPONENTS TEST RESULTS 1. Remove lead wires. Normal: VENTILATION MOTOR 2. Measure resistance. Approximately 20 to 40 ohms (ohm meter scale:Rx1) Abnormal: Infinite Normal: Approximately 1. Remove wire leads. TURNTABLE MOTOR 2.5 to 3.5 Kohms 2. Measure resistance. Abnormal: (ohm meter scale: Rx1000) Infinite or several.
  • Page 29 COMPONENTS TEST RESULTS Measure the resistance between terminal TOUCH KEY BOARD When When not pins of connector KEY CONNECTOR. touched touched NOTE: Resistance When reconnecting the FPC connector, value More than Less than make sure that the holes on the FPC 1 mega ohm 400 ohms connector are properly engaged with hooks...

  • Page 30: B.checkout Procedures

    B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 20 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after the door is closed. Improper operation of the primary interlock, secondary Fuse blows immediately after interlock switches and/or the interlock monitor switch. the door is opened.
  • Page 31 (2)CHECKOUT PROCEDURES FOR RELAY. -PROBLEM (A)- -PROBLEM (A)-- FAN motor turns on without touching START key Oven lamp turns on without touching START key when the door is closed. when the door is closed. Remove the mate connector of I/O Remove the mate connector of I/O GOOD GOOD...
  • Page 32 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit 5) Some segments of one or more digits do not light board. up, or they continue to light up, or segments light 1) Check the input current. If the input current is more when they should not.
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  • Page 37: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS For Model: LMV2053SB LMV2053SW 13581A 13552A 13536A 13213A 14760A 13720D WTP005 14026A 14890A 14970A WMP027 WWS005 13651A For Model: LMV2053ST 13581A 13552A 13536A 14760A 13213A 14890A 13551A WTP005 14026A WMP027 14970A WWS005 13651A...
  • Page 38 #EV# CONTROLLER PARTS For Model: LMV2053SB LMV2053SW 24781M 268711 WTP015 23572A 23506A 24810P For Model: LMV2053ST 24781M 268711 23551A WTP015 24810P...
  • Page 39 #EV# OVEN CAVITY PARTS WTT029 For Model 34960A WTT029 LMV2053SW WTT027 For Model LMV2053SB 33550P WTT027 LMV2053ST WTT028 33112U For Model 33530A LMV2053SB LMV2053SW For Model 33531A LMV2053ST 34810Q WMP004 34931A 34930R WNH001 63302A 36912C 35026G 33740A 330342 34890C WTT022...
  • Page 40 #EV# LATCH BOARD PARTS 43500A WSZ085 466001 43501A 466003 44510A 466001...
  • Page 41 #EV# INTERIOR PARTS (I) 56324A 33390G WSZ002 35012A 56930M 50CZZH 54810C 35889A 56851D 55238A 34370T WSZ002 33052A 56170D 55892A WTT021 55893A 54930F 36549S 53550F WTP013 53301A WSZ002 340511 WTT028...
  • Page 42 #EV# INTERIOR PARTS (II) WTP004 WSZ062 WTT037 WTP004 568773 36549V 50FZZA 56549F 56501A WTT028 56930V 56201A 50CZZM 53550L 55262A 56411A 56912B WTT028 56804A 55900A WNZ018 55231C 568771 WSZ062 WTT028...
  • Page 43 #EV# INSTALLATION PARTS 65862D 63300M 65862B 63861A VINYL COOKING *06-1 *06-2 UPPER WALL OWNERS SERVICE INSTALLATION GUIDE TEMPLATE TEMPLATE MANUAL MANUAL MANUAL LABEL...

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