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LG LMV1625W Service Manual

Lg microwave oven owner manual
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See also: Owner's Manual & Cooking Guide
website: http://www.lgservice.com

MICROWAVE OVEN

SERVICE MANUAL
MODEL : LMV1625B
LMV1625W
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG LMV1625W

  • Page 1: Microwave Oven

    MICROWAVE OVEN SERVICE MANUAL MODEL : LMV1625B LMV1625W CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Safety Precautions

    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

    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. SAFETY PRECAUTIONS ... SPECIFICATIONS... CAUTIONS ... INSTALLATIONS... OPERATING INSTRUCTIONS... CONTROL PANEL ... CONTROL PANEL INSTRUCTIONS ...

  • Page 4: Specifications

    Rated Power Consumption ... 1,500W maximum (Microwave oven+Cook top lamp+Ventilation fan) Microwave Output ... 1,000W (IEC 60705) Frequency ... 2,450 MHz ± 50 MHz Power Supply ... 120 VAC, 60 Hz Rated Current ... 13 Amp. (Microwave oven+Cook top lamps+Ventilation fan) Magnetron Cooling...

  • Page 5: Cautions

    Never look into an open waveguide or antenna while the device is energized. • Proper operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity. Never operate the magnetron unless it is properly installed.

  • Page 6: 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 15A or 20A. 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

    15. CLOCK: Touch this pad to enter the time of day. 16. HOLD WARM: Touch this pad to keep hot, cooked foods safety warm in your microwave oven for up to 99 minutes 99 seconds. 17. TIME COOK: Touch this pad to set a cooking time.

  • Page 9: Overall Circuit Diagram

    OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM...

  • Page 10: Matrix Circuit For Touch Key Board

    MATRIX CIRCUIT FOR TOUCH KEY BOARD HELP HI/LO/OFF LIGHT CUSTOM HI/LO/OFF LESS CLOCK CUSTOM LIGHT COOK TIMER T/TABLE STOP ON/OFF CLEAR MORE TIME COOK POPCORN COOK AUTO REHEAT POTATO DEFROST KITCHEN Ez On BEVERAGE TIMER POWER PIZZA LEVEL HOLD START WARM...

  • Page 11: General Information For Service

    GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE A. Never operate the unit when it is empty. Operating the oven with no load may shorten the life of the magnetron. Whenever cooking dry foods (dried fish, bread, etc.) or a small amount of food, be sure to put a glass of water into the cooking compartment.

  • Page 12: Service Information

    SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE. The filament leads of magnetron carry High Voltage with respect to ground. Extreme caution must be exercised.

  • Page 13: Microwave Leakage Test

    • Check for microwave leakage after every servicing. The power density of the microwave radiation leakage emitted by the microwave oven should not exceed 4 mW/cm . Always start measuring of an unknown field to assure safety for operating personnel from radiation leakage.

  • Page 14: Power Output Measurement

    - less than 2 mW/cm POWER OUTPUT MEASUREMENT (1) Microwave power output measurement is made with the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with a load of (1000±5) g of potable water.

  • Page 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E.
  • Page 16 HOW TO REMOVE THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F.P.C. connector. (1) Hold the edges of the plastic fastener withthumb and forefinger. (Figure 4) (2) Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger.
  • 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 front bracket. (3) Remove two screws securing it to the air duct. (4) Remove the mounting plate by turning the two 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 PROCEDURE” on page 7-12. Latch Board Secondary Interlock Switch WH(from H.V.Transformer)
  • Page 19 D. REMOVING MAGNETRON (Figures 11 Through 13) (1) Remove vertgrille. (2) Remove mount all. (3) Remove outcase. (4) Discinnect the wireleads. (5) Remove the 3 screws and Magnetron very carefully. vertgrille Figure 11 NOTE: • When removing the magnetron, make sure that its dome does not hit any adjacent parts, or it may be damaged.
  • Page 20 F. REMOVING DOOR (Figure 14) (1) Remove the vent grille by two screws securing it to the outcase loosening. (2) Lift up and draw the door. NOTES: • After replacing the door, be sure to check that the primary interlock switch, the secondary interlock switch and the interlock monitor switch is in good operating normally.
  • Page 21 (2) Remove the two screws securing the MOUNT, ALL and one screw securing the ventilation fan ASS'Y. (See Figure 17) Figure 16 Figure 17 (3) Carefully pull the ventilation motor ASS'Y out of the microwave oven. (See Figure 18) MOUNT, ALL 7-10 Figure 18...
  • Page 22 K. REMOVING THE TURNTABLE MOTOR (1) Remove the turntable. (2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. (Figure 19) (3) Remove the base plate by removing 6 screws securing it to the oven cavity. (Figure 20) (4) Disconnect the leadwire from the turntable motor terminals.

  • Page 23: Interlock System

    NOTE: The outer cover of the microwave oven is removed. (1) Set the microwave oven on its side so that you can see the latch board and the switches, as shown in Figure 22. (2) Close the door tightly and check gaps A and B to...
  • Page 24 TEST THE LATCH AND SWITCH SEQUENCE (5) Open the oven door slowly. Watch the door latch, the Secondary Switch. Release Rod and Lever on the switches to make sure they are zero to the body of the switches in the following sequence: - Primary Interlock Switch - Secondary Interlock Switch - Interlock Monitor Switch...

  • Page 25: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click should be heard at the same time or successively at intervals and the latches should activate the switches with an audible click. If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure.

  • Page 26: Test And Checkout Procedures And Trouble Shooting

    TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - -DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 27 COMPONENTS Measure the resistance: (1) Terminal to terminal Ohm- meter HIGH-VOLTAGE CAPACITOR (2) Terminal to case Ohm- meter Measure the continuity: (1) Forward Ohm- meter HIGH-VOLTAGE DIODE (1) Reverse Ohm- meter TEST PROCEDURES Figure 25-a Figure 25-b Figure 26-a Figure 26-b 7-16 RESULTS Normal reading:...
  • Page 28 COMPONENTS Measure the resistance between terminal pins of connector KEY CONNECTOR. NOTE: When reconnecting the FPC connector, make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener. (For detail matrix circuit of each model, refer to page 5-2.) TOUCH KEY BOARD...

  • Page 29: Checkout Procedures

    COMPONENTS Check for continuity of relay 2 with an ohm-meter. (Remove wire leads from relay 2 and operate the unit.) RELAY2 w w CAUTION : The relay connector 2(White) and 5(Red) must be correctly connected Relay 6. These two connectors are not Inter- changeable.
  • Page 30 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - TT motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O GOOD CON from the circuit board. Does the unit still operate? Replace the circuit board Defective...
  • Page 31 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. 1) The start function fails to operate but the high voltage Systems, the interlock switches, the door sensing and the relay check good. 2) The unit with a normal relay continuously operates. 3) Proper temperature measurement is not obtained.
  • Page 32 7-21...
  • Page 33 7-22...
  • Page 34 7-23...
  • Page 35 7-24...

  • Page 36: Exploded View

    EXPLODED VIEW DOOR PARTS 13552A 13581A 13536A 13213A 13720D WTT021 14890A 14026A 14970A 13650A...

  • Page 37: Controller Parts

    CONTROLLER PARTS 268711 24781M 24810P WTP018 23572A WTT029 23506A...

  • Page 38: Oven Cavity Parts

    OVEN CAVITY PARTS WTT021 34960A WTT028 WTT029 33530A WTT029 34810Q 33112U 34930R 35026G 33052A 368771 33550L 63303A 63302A 36912C 34890C 34810T WTT022 WTT022 35230A...

  • Page 39: Latch Board Parts

    LATCH BOARD PARTS 43500A 466001 WSZ084 43501A 466003 466001 44510A...
  • Page 40 INTERIOR PARTS(I) WSZ002 33390G 34370T 56324A WTT021 35889A WTT028 56170D 33740A WTT021 36549S WSZ002 WTP013 533002 56851D WSZ002 54810C 50CZZH 533001...
  • Page 41 INTERIOR PARTS (II) 56912B 55231C 36549V 53550L 56804A WTT028 56411A 55262A 50FZZA 56930V 55006F 568771 WSZ002 55892A 54930F 53550F 340511...
  • Page 42 INSTALLATION PARTS WSZ098 44360A WSZ133 WSZ204 WWZ068 WWZ068 63300M WSZ203 65862D WSZ136 65862B 63861A...

  • Page 43: Schematic Diagram Of Pcb

    SCHEMATIC DIAGRAM 8-12...

  • Page 44: Printed Circuit Board

    PRINTED CIRCUIT BOARD 8-13...
  • Page 45 May, 2003 P/NO. 3828W5S3242 Printed in Korea...

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Lmv1625b

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