LG LMVM2085ST Service Manual
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LG LMVM2085ST Service Manual

LG LMVM2085ST Service Manual

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LG LMVM2085ST
Owner's Manual
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Summary of Contents for LG LMVM2085ST

  • Page 1 This Owner's Manual is provided and hosted by Appliance Factory Parts. LG LMVM2085ST Owner's Manual Shop genuine replacement parts for LG LMVM2085ST Find Your LG Microwave Parts - Select From 955 Models -------- Manual continues below --------...
  • Page 2 삼 흥 정 판 Internal Use Only Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMVM2085SB LMVM2085ST LMVM2085SW CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. March, 2008 Printed in Korea P/NO : MFL06272505...

  • Page 3: Safety Precautions

    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 4: 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. CONTENTS {Page) Safety Precautions .............................. 2 1. Specification ..............................4 2.

  • Page 5: Specification

    1. 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 6: Cautions

    2. 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: Installation

    3. INSTALLATION 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 8: Operation

    4. OPERATION 4-1. Control Panel...

  • Page 9: Explanation Of Control Panel

    4-2. Explanation of Control Panel 1. DISPLAY The Display includes a clock and indicators to tell 12. 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 10: Wiring Diagram / Key Matrix

    5. WIRING DIAGRAM / KEY MATRIX 5-1. Wiring Diagram...

  • Page 11: Key Matrix

    5-2. Key Matrix KEY MATRIX COOK TIME VENT VENT LIGHT MAC & AUTO SOFTEN MELT 5-SPEED CHEESE ON/OFF HI/LOW/OFF TIME SET CHICKEN SENSOR SENSOR SENSOR DEFROS EZ-ON HOT DOG NUGGETS POPCORN COOK REHEAT CUSTOM WARMING CLOCK LESS MORE LAMP STOP/ START/ POWER LEVEL...

  • Page 12: Troubleshooting

    6. TROUBLESHOOTING 6-1. 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 A. The safety systems incorporated in this model life of the magnetron.

  • Page 13: Safety Caution

    6-2. Safety Caution A. SINCE NEARLY 4,000 VOLTS EXISTS IN (3) Do not operate the unit until it is completely SOME CIRCUITS OF THIS UNIT REPAIRS repaired, if any of the following conditions exist. SHOULD BECARRIED OUT WITH GREAT The unit must not be operated. CARE.

  • Page 14: Basic Check Summary

    6-3. Basic Check Summary 120VAc BK-L 120VAc WH-N BK-CN1-3 WH-CN1-1 Symptom: Dead Check: Open/Short Symptom: Dead Check: Open/Short (It is normally recovered if the set is cooled down) Symptom: Dead Check: Open/Short Symptom #1(Door is closed): No cook, Not operate F.M, S.M, T.T.M. Check: Open/Short when the door is closed.

  • Page 15: Troubleshooting

    6-4. Troubleshooting No Display or Dead -14-...
  • Page 16 4 Is there beep sound Replace the Does the display operate? in continuity test between thermostat. the ends of thermostats? (Oven, Magnetron) Go to No. 8 of When you push the any Key, this flow chart. is there any beep sound? Power Off 2 Is the connector connected Reconnect or...
  • Page 17 Power ON 6 Is there any beep sound Replace the 8 Is the voltage of POWER in continuity test between Noise filter. Replace the ends of the noise filter? PCB out of range? the Power PCB Normal condition (6871W1A460) - Pin 2 to Pin 3 of CN6 > 20 V - Pin 2 to Pin5 of CN 6 >...
  • Page 18 Keypad Failure • Start key or EZ-ON key works if the door is closed. -17-...
  • Page 19 3 When the door is opened, Replace the Does the keys operate? POWER PCB Is the voltage of door (6871W1A460) sensing part over 4 V? (Pin11 of CN1 to Pin12 of CN1) Power ON 1 Do not only START key and Check PWB EZ-ON key operate? Go to No.
  • Page 20 No Heat / No Cook -19-...
  • Page 21 Reconnect or Is the connector connected to After power on, does the repair product operate? Power PCB and MAIN PCB the connector. assembly disconnected or disassembled? (CN6, CN7) 1 Repeat Door Open and close Alternate with more than three times. explanation Does product operate? (Refer to the...
  • Page 22 Power Off 7 Is the resistance of high Replace the 5 Is there any beep sound Adjust latch High Voltage voltage Transformer out of board Transformer. in continuity test between rage? (Refer to 10) (Refer to 9-1, the ends of latch board? 9-2) - primary switch (Door should be closed.)
  • Page 23 8 Is the connector connected 11 Is the resistance of the high Reconnect or Replace the to High Voltage capacitor repair voltage diode out of rage? high voltage assembly disconnected or the connector. (Refer to 10) Diode. disassembled? Test Point Reverse Reverse Reverse...
  • Page 24 3 Push the EZ-ON (Operate) Turntable Motor Does Not Work Replace the POWER PCB. Is the voltage of both ends of the D30 over 8 V? Power ON Does the turntable motor operate? 1 Does the fan motor turn on Replace the when EZ-ON button is turntable...
  • Page 25 4 When the door is opened, Turn on automatically Replace the POWER PCB is the voltage over 4.0V? (6871W1A460) (Pin 11 of CN1 to Pin 12 of Is the product turn on CN1) automatically without pushing the start key? 1 Repeat Door Open and close Alternate with more than three times.

  • Page 26: Microwave Leakage Test

    7. 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 - Narda...

  • Page 27: Measurement With The Outer Case Removed

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

  • Page 28: Power Output Measurement

    8. POWER OUTPUT MEASUREMENT (1) Microwave power output measurement is made 4.187 Mw(T2 –T1)+0.55Mc(T2 –T0) with the microwave oven supplied at its rated voltage and operated at its maximum microwave is measured while the microwave generator is power setting with a load of (1000 ± 5) g of operating at full power.

  • Page 29: Interlock System

    9. INTERLOCK SYSTEM 9-1. 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...
  • Page 30 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.

  • Page 31: Interlock Continuity Test

    9-2. 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.

  • Page 32: Component Testing Information

    10. COMPONENT TESTING INFORMATION 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.
  • Page 33 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 34 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.
  • Page 35 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 megohm 400 ohms connector are properly engaged with hooks...

  • Page 36: Disassembly Instructions

    11. 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 37 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 38 B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the outer 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 outer case.
  • Page 39 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 40: Removing Magnetron

    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 assembly securing it to the (Figure 11) oven upper plate by using knife blade. (2) Remove the outcase.
  • Page 41 F. REMOVING DOOR (Figure 15) H. ASSEMBLING DOOR (1) Remove the vent grille by two screws securing it (1) When mounting the door assembly to the oven to the outcase loosening. assembly, be sure to adjust the door assembly parallel (2) Lift up and draw the door.

  • Page 42: Removing The Turntable Motor

    (3) Carefully pull the ventilation motor assembly out of J. REMOVING THE TURNTABLE MOTOR the 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 43: Replacing The Humidity Sensor

    K. REPLACING THE HUMIDITY SENSOR L. REMOVING CONVECTION HEATER (1) Remove the sensor by removing one screw securing it to the air duct. (See Figure 22) AND THERMISTOR (Figure 23) (2) Mount the new humidity sensor to the air duct. (1) Remove the out case.

  • Page 44: Exploded View

    #EV# DOOR PARTS (II) 1004 1002 1005 1000 1011 2006 1008 W136 2041 1381 1006 1007 W244 1009 -44-...
  • Page 45 #EV# CONTROLLER PARTS (II) 2004 2009 2381 W130 2008 MBM2 -46-...

  • Page 46: Oven Cavity Parts

    #EV# OVEN CAVITY PARTS For Model W138 W138 W138 W142 For Model 3010 W142 W142 3024 3031 W138 W109 W142 3029 3001 6001 W150 3005 3032 3045 W150 3036 W157 5036 6000 3033 W149 3018 3026 -47-...

  • Page 47: Latch Board Parts

    #EV# LATCH BOARD PARTS 4000 4002 W102 4001 4003 4002 4004 -48-...
  • Page 48 #EV# INTERIOR PARTS (I) W177 5404 5400 5441 5402 W177 3002 5401 3384 W108 5512 W108 5403 W110 5405 Back 5407 5008 5012 W108 W109 W124 W246 W101 5003 5007 W247 W108 5000 5002 5049 5024 5046 5018 W248 5051 5044 5009 5058...
  • Page 49 #EV# INTERIOR PARTS (II) W109 W109 3027 W109 W101 W144 W101 5021 5001 W150 5016 5041 W144 5412 5011 5019 W144 5707 5036 W144 5038 5045 W144 5010 5038 W101 5071 5032 5015 5014 W150 W144 5015 W105 5069 5037 -50-...

  • Page 50: Installation Parts

    #EV# INSTALLATION PARTS 6008 6011 6010 6009 COOKING MFL1 MFL3 MEZ1 MBM4 MBM5 UPPER WALL INSTALLATION & GUIDE TEMPLATE TEMPLATE MANUAL CARE LABEL -51-...

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