LG LMVM2055ST Service Manual
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Also See for LMVM2055ST:
- Owner's manual (35 pages) ,
- Owner's manual (35 pages) ,
- Installation instructions manual (21 pages)
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Summary of Contents for LG LMVM2055ST
- Page 1 Website: http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMVM2055SB LMVM2055ST LMVM2055SW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. July, 2005 P/NO : 3828W5S6190 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;...
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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 ........1700W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ..........1100W (IEC 60705) 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 NOTE: Styling and features vary by model. 12. EZ - ON: Touch this pad to set and start quickly at 1. DISPLAY: The Display includes a clock and indicators 100% power level. to tell you time of day, cooking time setting, and cooking functions 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 TIME (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 STOP/ START/... -
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 OUTSIDE 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 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 outside case.
- 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) Disconnect two leadwires.
- 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.(Figure 20) (4) Disconnect the leadwire from the turntable motor terminals.
- 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...
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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 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:...
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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 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 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...
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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/ENTER Oven lamp turns on without touching START/ENTER key when the door is closed. key 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
FOR MODEL: LMVM2055SB LMVM2055SW 13581A 13552A 13536A 13213A 14760A 14890A 268711 13551B 268771 WTP004 268772 14026A 14970A WTT029 13806D 23506A 13650A FOR MODEL: LMVM2055ST 13581A 13552A 13536A 13213A 14760A 14890A 268711 268771 WTP004 13551A 268772 14026A 14970A WMT022 13806D 149801 13650A WTT028... - Page 38 #EV# CONTROLLER PARTS FOR MODEL: LMVM2055SB LMVM2055SW 24781M 268712 WTP015 23572A 24810P FOR MODEL: LMVM2055ST 24781M 268712 23551A WTP015 24810P...
- Page 39 #EV# OVEN CAVITY PARTS For Model LMVM2055SB WTT027 WTT027 LMVM2055ST 34960A WTT029 For Model WTT029 33550P LMVM2055SW WTT021 WTP013 For Model 36549S LMVM2055SB 33530A LMVM2055SW For Model 33531A 33112U LMVM2055ST 34810Q 33390M 34930R 35026G 34931A 330342 WTP005 WTT022 33550L 63302A...
- Page 40 #EV# LATCH BOARD PARTS 43500A WSZ085 466001 43501A 466003 44510A 466001...
- Page 41 #EV# INTERIOR PARTS (I) WTT037 56549F WTT028 33390G 56170D 35889A WSZ002 55900A 54974S 34351A 55238A WTT028 55892A 54930F 56324A 54980A WSZ002 35012A 53550F 50CZZH WTT028 56930M 340512 36549S 53301A 340511 WTP013 54810C 56851D WSZ002 WTT028 WSZ002...
- Page 42 #EV# INTERIOR PARTS (II) WTT028 36549V WTP005 50FZZA 568773 WTT024 50CZZM 56501A 56930V 56201A 53550L 55262A 56411A 56549B 56912B 56804A 568772 55231C 568774 568771...
- 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...