LG LMVM2075SB Service Manual
Microwave oven
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Also See for LMVM2075SB:
- Owner's manual (36 pages) ,
- Installation instructions manual (21 pages) ,
- Specification (2 pages)
Related Manuals for LG LMVM2075SB
Summary of Contents for LG LMVM2075SB
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Page 1: Microwave Oven
Website: http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMVM2075SB LMVM2075ST LMVM2075SW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. February, 2007 P/NO : MFL06272503 Printed in Korea... -
Page 2: Warning To Service Technicians
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 ................................2-1 INSTALLATIONS .. -
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 145 °C ±5 °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 indicators to tell 13. 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, disply speed, and defrost weight. selected. -
Page 9: Overall Circuit Diagram
OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM... -
Page 10: Matrix Circuit For Touch Key Board
MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX COOK CUSTOM TIME COOK VENT VENT LIGHT CHICKEN AUTO SOFTEN MELT ON/OFF 5-SPEED CHOICES HI/LOW/OFF TIME SET AUTO TIME QUICK POPCORN COOK REHEAT EZ-ON DEFROST DEFROST DEFROST CUSTOM HOLD TIMER CLOCK LESS MORE WARM POWER... -
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. Operating the oven with no load may shorten the life of the A. The safety systems incorporated in this model are: 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: (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. Circuit Board WHEN RECONNECTING THE WIRE LEADS TO 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 “ADJUSTMENT PROCEDURES” on page 7-12. WIRE COLOR SYMBOL COLOR...
- Page 19 D. REMOVING MAGNETRON • When replacing the magnetron, be sure to install the magnetron gasket in the correct position and be sure (Figures 11 Through 12) that the gasket is in good condition. (1) Remove the vent grille by loosening two screws. (Figure 11) •...
- Page 20 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 15) (Figures 13 and 14) (1) Remove the vent grille by two screws securing it (1) Remove one rivet ASS'Y securing it to the oven to the outcase loosening. upper plate by using knife blade. (2) Lift up and draw the door.
- Page 21 H. ASSEMBLING DOOR (3) Carefully pull the ventilation motor ASS'Y out of the microwave oven. (See Figure 18-b) (1) When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly.
- Page 22 J. REMOVING THE TURNTABLE MOTOR K. REPLACING THE HUMIDITY SENSOR (1) Remove the glass tray and rotating ring. (1) Remove the sensor by removing two screws (2) Remove the turntable shaft VERY CAREFULLY securing it to the air duct. (See Figure 22) with a hand.
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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 (5) Open the oven door slowly. Watch the door latch, switches in Steps 5 and 6, tighten the latch board the Secondary Switch. Release Rod and Lever screws at that point.
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Page 25: Interlock Continuity Test
INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B.S ECONDARY 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 20 to 40 ohms (ohm meter scale:Rx1) Abnormal:Infinite Normal: Approximately 1. Remove wire leads. TURNTABLE MOTOR 2.0 to 3.0 Kohms 2. Measure resistance. Abnormal: (ohm meter scale: Rx1000) Infinite or several.
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Page 29: A.test Procedures
KEY MATRIX COMPONENTS TEST PROCEDURES 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
268711 LMVM2075SW 268772 WTP004 LMVM2075SW / 01 268771 13551B 14026A * Check the Rating Model No. For Model : LMVM2075SB / 02 14970A LMVM2075SW / 02 For Model : LMVM2075SW WMT022 For Model : LMVM2075SB WTT027 13806D 23506A For Model : LMVM2075SW... -
Page 38: Controller Parts
#EV# CONTROLLER PARTS FOR MODEL: LMVM2075SB LMVM2075SW 24781M 268712 WTP015 23572A 24810P FOR MODEL: LMVM2075ST 24781M 268712 23551A WTP015 24810P... -
Page 39: Oven Cavity Parts
#EV# OVEN CAVITY PARTS For Model WTT029 WTT029 LMVM2075SW WTT029 WTT027 For Model WTT027 LMVM2075SB WTT027 34960A For Model LMVM2075ST 33530A LMVM2075SB LMVM2075SW For Model 33531A LMVM2075ST 33550P WTT029 WTT028 WTT027 34810Q 33112U 63303A 34931A 330342 WTP005 34930R WTP033 33550L... - Page 40 #EV# LATCH BOARD PARTS 43500A 466001 WSZ085 43501A 466003 466001 44510A...
- Page 41 #EV# INTERIOR PARTS (I) 33390G 33700A 33391E Back WTT037 56170D 56549F WTT028 WSZ002 54974S 55900A WTT021 50CZZH 54810C 55238A 55893A 56851D 55892A 56324A 54930F WTT021 53550F 56930M 36549S WTP013 35012A WTT028 340511 53301A WTT028...
- Page 42 #EV# INTERIOR PARTS (II) 36549V 50FZZA WTT028 WTP005 WSZ062 568773 50CZZM 56930V 56201A 56501A WTT024 56010L 55262A 53550L 56411A 56804A 56549B 56912B 568772 568774 55231C 568771...
- Page 43 #EV# INSTALLATION PARTS 65862D 63300M 65862B 63861A COOKING TECHNICAL INSTALLATION TEMPLATE & GUIDE MANUAL CARD MANUAL CARE LABEL...