LG LSMC3089BD Service Manual
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LG LSMC3089BD Service Manual

LG LSMC3089BD Service Manual

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삼
흥
정
판
MICROWAVE OVEN
SERVICE MANUAL
MODEL: LSMC3086ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL06272539
LSMC3089BD
Internal Use Only
Website http://biz.lgservice.com
May, 2015
Printed in Korea

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  • Page 1 삼 흥 정 판 Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LSMC3086ST LSMC3089BD CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2015 P/NO : MFL06272539 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 ........ Microwave 1650W Convection 1650W Microwave Output..........Microwave 950W (IEC60705) Adjustable 95W through 950W, 10 steps Convection 1500W Frequency ............2450 MHz ±50 MHz Power Supply ............ 120 V~ 60 Hz Rated Current ............ Microwave 14.0A Convection 14.0A Magnetron Cooling ..........

  • 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 11. SPEED AUTO COMBI: Touch this pad when setting to tell you time of day, cooking time settings, and weight combination cooking. cooking functions selected. 12. AUTO DEFROST: Touch this pad to select food type and defrost food by weight.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM CAUTIONS • Disconnect from electrical supply before servicing unit. • Sharp edges. Wear gloves when replacing main fuse or servicing the product to prevent injuries.

  • Page 10: 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 11: 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 12: 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 13: 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 14: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: (4) Remove 4 screws securing the circuit board. UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, Circuit Board UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED.
  • Page 15 B. REMOVING THE OUT CASE(Figure 4) (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. (4) Remove two screws on the left central edge and one screw on the right central edge of Base plate.
  • Page 16 C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 5, 6) (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 7-11. Latch Board Primary Primary...
  • Page 17 D. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 7 Through 13b) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille by loosening two screws. damaged. (Figure 7) (2) Remove the outcase.
  • Page 18 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 12) (Figures 10 and 11) (1) Remove the vent grille by two screws securing it to (1) Remove two screws securing it to the oven the outcase loosening. upper plate by using drive screw. (2) Lift up and draw the door.
  • Page 19 H. ASSEMBLING DOOR J. REPLACING THE HUMIDITY SENSOR (For sensor model only) (1) When mounting the door assembly to the oven (1) Remove the sensor by removing two screws assembly, be sure to adjust the door assembly securing it to the air duct. (See Figure 15-c). parallel to the chassis.
  • Page 20 K. REMOVING THE TURNTABLE MOTOR L. REMOVING CONVECTION HEATER AND THERMISTOR (Figure 19) (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY (1) Remove the out case. with a slotted screwdriver. (Figure 16) (2) Remove the air duct by removing six screws (3) Remove the base plate by removing 7 screws securing it to the oven front plate, guide air and securing it to the oven cavity.

  • Page 21: 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 22 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 23: 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 24: 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 25 COMPONENTS TEST RESULTS CAPACITOR 1. Remove wire leads. 2. Measure resistance. (ohm meter scale: Rx1000) Normal: • Terminal to terminal Momently indicates several ohm, and then gradually returns to infinite • Terminal to case Normal: Infinite. DIODE Some inexpensive meters 1.
  • Page 26 COMPONENTS TEST RESULTS VENTILATION MOTOR 1. Remove wire leads. Normal: 2. Measure resistance. Approximately (ohm meter scale: Rx1) 25 to 45 ohm BL-BK(H) BL-WH(L) BL-GY(S) 20-40 40-60 75-95 DAMPER MOTOR (D.M) 1. Remove wire leads. Normal:Approximately TURNTAbLE MOTOR (T.M) 2. Measure resistance. STIRRER MOTOR (S.M) (ohm meter scale: Rx1000) 2.3-4.5...

  • Page 27: 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 interlock switches and/or the interlock monitor switch. Fuse blows immediately after the door is opened.
  • Page 28 (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 29 (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.

  • Page 30: Troubleshooting

    C. TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE TOASTER AND MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1.
  • Page 31 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 32 (TROUBLE 2) Microwave oven does not operate at all, Display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor of monitor switches, and switch (with...
  • Page 33 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START/ENTER pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1. Setting time does No continuity. secondary switch. secondary switch.
  • Page 34 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Disconnect the Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 4 and check continuity Continuity.
  • Page 35 (TROUBLE 6) Convection oven does not operate at all or convection cook is bad. CONDITION CHECK RESULT CAUSE REMEDY Check the Relay Convection indicator Abnormal. Defective Relay 2. Replace Relay 2. 2 of P.C.B. light but oven does assembly. not go into cook cycle when START/ENTER Normal.

  • Page 36: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS MODEL: Customer Model Product Code SVC Model 1005 1004 1000 1381 1007 1006 W244 1009...
  • Page 37 #EV# CONTROLLER PARTS 2004 2041 2042 2028 2381 2008 2006 2011 260M 2030 2400 2043...
  • Page 38 #EV# OVEN CAVITY PARTS 3010 3031 3024 3001 3103 3029 3009 6001 W202 3045 W178 6000 3005 3037 3032 3011 3025 3026...
  • Page 39 #EV# LATCH BOARD PARTS 4001 4000 4002 W102 4003 4002 4004...
  • Page 40 #EV# INTERIOR PARTS (I) W101 5052 3048 5003 5012 3044 5007 5000 5002 3002 3012 5018 W101 5116 3006 5009 3008 5024 5049 5035 5008 5062 5029 3206 W125 W141 W124 3207 5403 5021 5411 5116 5409 5407 W101 W141 W124 W177 5452...
  • Page 41 #EV# INTERIOR PARTS (II) W178 5067 5045 5385 5800 3005 5011 W300 3021 5382 3051 5006 3006 5412 W140 5016 5037 5010 3027 5001 5041 5410 5014 W140...
  • Page 42 #EV# INSTALLATION PARTS 6008 6011 6010 6009 VINYL...

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