LG LMV1645SB Service Manual
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LG LMV1645SB Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: LMV1645SB
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S4066
LMV1645ST
LMV1645SW
LMV1645SBQ
Website: http://us.lgservice.com
June, 2004
Printed in Korea

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  • Page 1 Website: http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMV1645SB LMV1645ST LMV1645SW LMV1645SBQ CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. June, 2004 P/NO : 3828W5S4066 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 ..............................

  • Page 4: Specifications

    SPECIFICATIONS Rated Power Consumption ........1560W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1000W (IEC 60705) Frequency ............2450 MHz ±50 MHz Power Supply .............120 VAC, 60 Hz Rated Current ............13.3 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 145 °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 connection.

  • 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 13. Q DEFROST: This pad provides you with the indicators to tell you time of day, cooking time RAPID defrosting method for 1.0 pound frozen settings and cooking functions selected. foods.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM 120V MICOM CONTROLLER ASS’Y OVEN 60Hz THERMOSTAT FUSE 1 2 3 L.V. 1’ 2’ 3’ (20A) TRANS FORMER CONDENSER MAIN RELAY C/TOP 1’ 2’ 4’ 6’ 3’ 5’ LAMP 1 2 3 HIGH RELAY M.G.T HIGH C/TOP LAMP...

  • 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 FEATURES 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 manufacture importer, or assembler of any certified - Narda...

  • Page 14: Power Output Measurement

    MEASUREMENT WITH THE OUTER 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: 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 OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out 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 out 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 E. REMOVING STIRRER FAN (Figures 11 Through 12) (Figures 13 and 14) (1) Remove the vent grille by loosening two screws. (1) Remove one rivet ASS'Y securing it to the oven (Figure 11) upper plate by using knife blade. (2) Remove the outcase.
  • Page 20 F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by two screws securing it to (1) When mounting the door assembly to the oven the outcase loosening. assembly, be sure to adjust the door assembly (2) Lift up and draw the door. parallel to the chassis.
  • 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 glass tray and rotating ring. (2) Remove the turntable shaft VERY CAREFULLY with a hand. (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 two screws 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 eliminate completely 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: Momently indicates several ohm, 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 50 to 70 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: 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 6) Wrong figures appear. board. 7) The figures of all digits. 1) The start function fails to operate but the high 8) Some of the indicators do no flicker light up. voltage Systems, the interlock switches, the door 9) The clock does not keep time properly.
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  • Page 37: Exploded View

    EXPLODED VIEW DOOR PARTS FOR MODEL: LMV1645SB LMV1645SW LMV1645SBQ 13552A 13581A 13536A 13213A 14890A 13720D 14026A 13650A 14970A WTT028 FOR MODEL: LMV1645ST 13581A 13552A 13536A 13213A 13551A 14026A WTT028 13650A 14970A...
  • Page 38 CONTROLLER PARTS FOR MODEL: LMV1645SB LMV1645SW 268711 LMV1645SBQ 24781M 24810P WTP018 23572A 268712 23506A FOR MODEL: LMV1645ST 268711 24810P WTP018 268712 23551A 24781M...
  • Page 39 OVEN CAVITY PARTS For Model LMV1645SB WTT027 LMV1645ST For Model 34960A LMV1645SW WTT029 LMV1645SBQ WTT028 33530A 34810Q 33112U 34930R 35026G 63303A 368771 66804A 63302A 33550L 36912C 34890C WTT022 35230A 34810T WTT022...
  • Page 40 LATCH BOARD PARTS 43500A 466001 WSZ084 43501A 466003 466001 44510A...
  • Page 41 INTERIOR PARTS ( I ) 33390G WSZ002 54810A 56930M 56324A 34351A WTP002 55238A WTT021 35889A 56170D 53300B WTT021 33740A 36549S WSZ002 WTP013 WTT021 56851D WSZ002 54810C 50CZZH...
  • Page 42 INTERIOR PARTS ( II ) 36549V 56912B 55231C WTT037 53550L 56549F 56804A WTT028 50CZZM WTP005 55262A 56411A 568773 50FZZA 56930V 55006F 55900A WTP013 568771 56501A WSZ002 WTT024 56549B 55901A 53550F 340511...
  • Page 43 INSTALLATION PARTS 63300M WTT028 65862D 65862B 63861A VINYL...

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