LG LRM1230W Service Manual
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LG LRM1230W Service Manual

LG LRM1230W Service Manual

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See also: Owner's Manual & Cooking Guide

MICROWAVE OVEN

SERVICE MANUAL
MODEL : LRM1230W
LRM1230B
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website: http://www.lgservice.com
e-mail : http://www.lgeservice.com/techsup.html

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  • Page 1: Microwave Oven

    : http://www.lgeservice.com/techsup.html MICROWAVE OVEN SERVICE MANUAL MODEL : LRM1230W LRM1230B CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION LRM1230W/LRM1230B MODEL 120 Volts AC 60 Hz Power Requirement 1,650 Watts (13.8 A) Single phase, 3 wire grounded 1,200 Watts full microwave power (IEC705) Power Output 2,450 MHz Microwave Frequency 2M246 Magnetron 0 ~ 99 min. 99 sec.

  • 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. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with For personal safety, this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Door Open Button Safety Door Lock System Turntable Rotating Ring CONTROL PANEL 1. DISPLAY: The display includes a clock and indicators that tell you the time of day, cook time settings, and cooking functions selected.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions 7. CHILD LOCK during oven operation. This oven has a CHILD LOCK feature TO SET CHILD LOCK 1. CANCEL FUNCTION • Touch pad. STOP/CLEAR Touch the pad whenever you need to STOP/CLEAR •...

  • Page 9: Auto Cook

    14. MELT STOP/CLEAR MELT NUMBER OF TABLE NOTE: Then the oven will start automatically. 15. SOFTEN STOP/CLEAR SOFTEN NUMBER OF TABLE NOTE: Then the oven will start automatically. 16. AUTO COOK STOP/CLEAR AUTO COOK NUMBER OF TABLE NOTE: Then the oven will start automatically. 17.

  • Page 10: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 11: Circuit Description

    CIRCUIT DESCRIPTION GENERAL DETAILS • A high voltage of approximately 2100 volts AC is generated in the secondary of the high voltage • The low voltage transformer supplies the necessary transformer which is increased by the action of the high voltage to the micom controller when power cord is voltage diode and charging of the high voltage plugged in.

  • Page 12: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC, Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •...

  • Page 13: Record Keeping And Notification After Measurement

    MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be moved no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage before the outer case is otherwise a false reading may result.

  • Page 14: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with • The microwave power output P in watts is calculated the microwave oven supplied at its rated voltage and from the following formula : operated at its maximum microwave power setting with 4187 x (∆T) a load of (1000±5) g of potable water.
  • Page 15 D. PCB ASSEMBLY REMOVAL Remove choke cover 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the PCB SUB ASS’Y to the control panel. 3) Disconnect the flat cable from the PCB SUB ASS’Y and take off the PCB SUB ASS’Y Control Panel PCB Sub Asm...
  • Page 16 F. AIR DUCT ASSEMBLY REMOVAL H. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable and rotating ring. 1) Disconnect the leadwire from the lamp. 2) Lay the unit down on its back. 2) Remove the mounting screw to the magnetron. 3) Remove the turntable motor cover.

  • Page 17: Diode Removal

    I. HIGH VOLTAGE TRANSFORMER L. INTERLOCK SYSTEM REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Discharge the high voltage capacitor. been specially designed to eliminate completely 2) Disconnect the leadwire from magnetron, high voltage microwave activity when the door is opened during transformer, and capacitor.

  • Page 18: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF OR V-5220Q FOR MONITOR SWITCH TYPE NO.

  • Page 19: Component Test Procedure

    COMPONENT TEST PROCEDURE 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 WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 20 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx1000) several ohms, and...
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Check for continuity of relay 2 with an RELAY 2 POWER ohm-meter. LEVEL (Remove wire leads from relay 2 and operate the unit.) 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec 10 sec 12 sec 12 sec 10 sec...

  • Page 22: Trouble Shooting

    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 MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 23 (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 24 (TROUBLE 2) 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. primary, monitor, monitor switch. of monitor secondary switch (with...
  • Page 25 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace Check continuity 1. Setting time No continuity. secondary switch. secondary switch.
  • Page 26 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY No microwave Defective PCB Replace PCB Disconnect the No continuity. oscillation. assembly. assembly. wire leads from relay 2 and check continuity Continuity.

  • Page 27: Exploded View

    EXPLODED VIEW INTRODUCTION OUTER CASE INTERIOR DOOR BASE PLATE LATCH BOARD CONTROL PANEL...

  • Page 28: Door Parts

    DOOR PARTS 13581A 15006A 13552A 13536A 13213A 13720D 13352A 14026A 14970A...

  • Page 29: Controller Parts

    CONTROLLER PARTS 24781M 23572A 268711 23506A WTP018 24510L 24970A 250201...

  • Page 30: Oven Cavity Parts

    OVEN CAVITY PARTS WSZ185 948502 33112U 33052A WTT010 WTT020 33390G 36549S 35889A WTP013...

  • Page 31: Latch Board Parts

    LATCH BOARD PARTS WSZ085 466001 43500A 466003 466001...

  • Page 32: Interior Parts

    INTERIOR PARTS WSZ002 568771 56411A 50FZZA 948503 55006F 56930V 34930W 56549F WSZ085 54974S WSZ187 55900A WTT037 WTT028 50CZZH WSZ002 54810C 56912B 56324A WTT028 948501 55262A WSZ002 56851D...

  • Page 33: Base Plate Parts

    BASE PLATE PARTS 56170D 63302A 63303A 65006B WSZ002 WTT021...

  • Page 34: Replacement Parts List

    REPLACEMENT PARTS LIST FOR MODEL: MS-1243AZ-KWHELGA LOC. PART NO. DESCRIPTION ALTER 3828W5A3158 MANUAL,OWNERS 3828W5S3026 MANUAL,SERVICE 3890W3Y583A BOX,YELLOW 13213A 3213W1A031Q DOOR FRAME ASSEMBLY 13352A 3352W1A143A FRONT SCREEN 13536A 3536W1A004A SEAL TAPE 13552A 3552W0A012A CHOKE COVER 13581A 3581W1A386A DOOR ASSEMBLY 13720D 3720W0D312A PANEL,DOOR 14026A 4026W2A016A...
  • Page 35 FOR MODEL: MS-1243AZ-KWHELGA LOC. PART NO. DESCRIPTION ALTER 56930V 6930W1A004A THERMOSTAT 6930W1A001J 56930V 6930W1A004A THERMOSTAT 6930WRT002F 63302A 3302W0A036B BASE PLATE 63303A 3303W0A019B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP,BASE PLATE 948501 3B72244T CUSHION 948502 3B72244C CUSHION 948503 3B72246B CUSHION WSZ002 1SBF0402418 SCREW TAP TITE(S),BINDING HEAD WSZ085 4B70188C...
  • Page 36 FOR MODEL: MS-1243AZ-KBKELGA LOC. PART NO. DESCRIPTION ALTER 3828W5A3158 MANUAL,OWNERS 3828W5S3026 MANUAL,SERVICE 3890W3Y583A BOX,YELLOW 13213A 3213W1A031P DOOR FRAME ASSEMBLY 13352A 3352W1A143B FRONT SCREEN 13536A 3536W1A004A SEAL TAPE 13552A 3552W0A012A CHOKE COVER 13581A 3581W1A386B DOOR ASSEMBLY 13720D 3720W0D312B PANEL,DOOR 14026A 4026W2A016A LATCH 14970A 4970WRA001B...
  • Page 37 FOR MODEL: MS-1243AZ-KBKELGA LOC. PART NO. DESCRIPTION ALTER 56912B 6912W3B002L LAMP,DRAWING 56930V 6930W1A004A THERMOSTAT 6930W1A001J 56930V 6930W1A004A THERMOSTAT 6930WRT002F 63302A 3302W0A036B BASE PLATE 63303A 3303W0A019B BASE PLATE ASSEMBLY 65006B 5006W3A019A CAP,BASE PLATE 948501 3B72244T CUSHION 948502 3B72244C CUSHION 948503 3B72246B CUSHION WSZ002 1SBF0402418...

  • Page 38: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B.

  • Page 39: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

  • Page 40: P.c.b. Parts List

    P.C.B. PARTS LIST LOC. PART NO. DESCRIPTION SPEC ALTER 0RZ1503G610 RESISTOR,DRAWING 150KOHM 1/4W 5% 3216 BULK 8 PIN 6908W3YA01B BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70DB 6908W3YA01A 0CK1040K949 CAPACITOR,FIXED CERAMIC(HIGH DIELECTRIC) 0.1UF D 50V 80%,-20% F(Y5V) TA52 0CE2276K618 CAPACITOR,FIXED ELECTROLYTIC 220UF SMS,SG 50V 20% FL TP 5 0CE4771J618 CAPACITOR,FIXED ELECTROLYTIC...
  • Page 41 LOC. PART NO. DESCRIPTION SPEC ALTER 0TR105008CA TRANSISTOR,BIPOLARS KRC105S KEC R/TP SOT23 50V 100MA 0TR107009AC TRANSISTOR,BIPOLARS KRA107S-T1 KEC TP TO92 50V 100MA 0TR107009AC TRANSISTOR,BIPOLARS KRA107S-T1 KEC TP TO92 50V 100MA 0RD1501F609 RESISTOR,FIXED CARBON FILM 1.5K OHM 1/6 W 5% TA52 0RH4701L622 RESISTOR,METAL GLAZED(CHIP) 4.7K OHM 1/8 W 5% 2012 R/TP...
  • Page 42 Mar., 2002 P/NO : 3828W5S3026 Printed in China...

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