LG LMVH1711ST Service Manual
  1. Manuals
  2. Brands
  3. LG Manuals
  4. Microwave Oven
  5. LMVH1711ST
  6. Service manual
LG LMVH1711ST Service Manual

LG LMVH1711ST Service Manual

Hide thumbs Also See for LMVH1711ST:
Table of Contents

Advertisement

Quick Links

Download this manual
Internal Use Only
MICROWAVE OVEN
SERVICE MANUAL
MODEL: LMVH1711ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
May, 2011
Printed in Korea
P/NO : MFL06272524

Advertisement

Table of Contents
loading

Related Manuals for LG LMVH1711ST

Summary of Contents for LG LMVH1711ST

  • Page 1 Internal Use Only MICROWAVE OVEN SERVICE MANUAL MODEL: LMVH1711ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2011 Printed in Korea P/NO : MFL06272524...
  • 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 LMVH1711ST 00 LMVH1711ST 01 Microwave 1650 W Rated Power Consumption ........ Microwave 1600 W Convection 1650 W Convection 1700 W Microwave Output..........Microwave 950W (IEC60705) Adjustable 95W through 950W, 10 steps Convection 1500W Frequency ............2450 MHz ±50 MHz Power Supply ............

  • 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 LMVH1711ST 00 LMVH1711ST 01...

  • Page 8: Control Panel Instructions

    CONTROL PANEL INSTRUCTIONS 1. DISPLAY: The Display includes a clock and indicators 13. CONV.: Touch this pad when setting Convection to tell you time of day, cooking time settings, and cooking. cooking functions selected. 14. COMBI.: Touch this pad when setting combination 2.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM(LMVH1711ST 00)
  • Page 10 SCHEMATIC DIAGRAM(LMVH1711ST 01)

  • Page 11: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD KEY MATRIX LMVH1711ST 00 CUSTOM MICRO. CONV. COMBI. COOK (VENT) (VENT) (VENT) LIGHT AUTO SOFTEN MELT ON/OFF 5-SPEED ON/OFF TIME SET SPEED (SENSOR) (SENSOR) (SENSOR) AUTO AUTO EZ-ON COOK REHEAT DEFROST POPCORN COMBI. CUSTOM...

  • Page 12: 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 13: 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 14: 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 15: 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 16: Disassembly Instructions

    CUIT DIAGRAM. (ESPECIALLY SWITCHES AND Circuit Board HIGH VOLTAGE CIRCUIT.) Circuit Board A. REMOVING POWER AND CONTROL LMVH1711ST 00 LMVH1711ST 01 CIRCUIT BOARD (Figures 1, 2 and 3) Circuit Board (1) Remove a screw securing the control panel Circuit Board Figure 2 assembly to the oven cavity.
  • Page 17 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 18 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. (4) Remove two screws on the left central edge and one screw on the right central edge of Base plate.
  • Page 19 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. Latch Board Primary Primary...
  • Page 20 D. REMOVING MAGNETRON NOTES: • When removing the magnetron, make sure that its (Figures 11 Through 13b) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille by loosening two screws. damaged. (Figure 11) (2) Remove the outcase.
  • Page 21 E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 16) (Figures 14 and 15) (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 22 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 19-c). parallel to the chassis.
  • Page 23 K. REMOVING THE TURNTABLE MOTOR L. REMOVING CONVECTION HEATER AND THERMISTOR (Figure 23) (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY (1) Remove the out case. with a slotted screwdriver. (Figure 21) (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 24: 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 25 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 26: 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 27: 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.
  • Page 28 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 29 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 Normal:Approximately DAMPER MOTOR (D.M) 1. Remove wire leads. TURNTABLE MOTOR (T.M) 2. Measure resistance. STIRRER MOTOR (S.M) (ohm meter scale: Rx1000) 2.3-4.5...
  • Page 30 CONNECTOR(KEY CON) CUSTOM MICRO. CONV. COMBI. COOK (VENT) (VENT) (VENT) LIGHT AUTO SOFTEN MELT ON/OFF 5-SPEED ON/OFF TIME SET LMVH1711ST 00 SPEED (SENSOR) (SENSOR) (SENSOR) AUTO AUTO EZ-ON COOK REHEAT DEFROST POPCORN COMBI. CUSTOM AUTO TURNTABLE TIMER CLOCK MORE LESS...

  • Page 31: 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 32 (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 33 (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 34: 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 35 (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 36 (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 37 (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 secondary Check continuity 1. Setting time does No continuity. secondary switch.
  • Page 38 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Disconnect the Defective P.C.B Replace P.C.B No continuity. oscillation. wire leads from assembly assembly relay 8 and check continuity Continuity.
  • Page 39 (TROUBLE 6) Convection oven does not operate at all or convection cook is bad. CONDITION CHECK RESULT CAUSE REMEDY Defective Relay Replace Relay Check the Relay Convection indicator Abnormal. 10 of P.C.B. light but oven does assembly. not go into cook cycle when START/ENTER Normal.

  • Page 40: Exploded View

    #EV# EXPLODED VIEW DOOR PARTS MODEL: Customer Model Product Code SVC Model MODEL: Customer Model Product Code SVC Model 1005 1004 MODEL: Customer Model Product Code SVC Model 1000 1008 1381 1007 1011 1006 W244 W127 1009...
  • Page 41 MODEL: Customer Model Product Code SVC Model #EV# CONTROLLER PARTS MODEL: Customer Model Product Code SVC Model MODEL: Customer Model Product Code SVC Model 2004 2006 2008 2381...
  • Page 42 #EV# OVEN CAVITY PARTS 3010 3031 3024 3001 3103 3029 3009 W212 6001 W202 3045 W178 6000 3005 3037 3032 3011 3025 3026...
  • Page 43 #EV# LATCH BOARD PARTS 4001 4000 4002 W102 4003 4002 4004...
  • Page 44 #EV# MODEL: Customer Model Product Code SVC Model INTERIOR PARTS (I) MODEL: Customer Model Product Code SVC Model W101 5052 3048 5003 5012 3044 5000 5007 5002 3002 3012 5018 5116 W101 3006 5009 3008 5024 5049 5035 5008 5062 5029 3206 W125...
  • Page 45 #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 46 #EV# INSTALLATION PARTS 6008 6011 6010 6009 VINYL...

Table of Contents