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LG MS-324SCE Service Manual

Lg microwave oven service manual
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See also: Owner's Manual & Cooking Guide

MICROWAVE OVEN

SERVICE MANUAL
MODEL : MS-324SCE
MS-325SCE
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Website: http://biz.lgservice.com
ECN NO. MS-324SCE/02
MS-325SCE/02

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Summary of Contents for LG MS-324SCE

  • Page 1: Microwave Oven

    Website: http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL : MS-324SCE MS-325SCE CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. ECN NO. MS-324SCE/02 MS-325SCE/02...

  • 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 MS-324SCE/MS-325SCE MODEL 230/240 Volts AC 50 Hz Power Requirement 1,500 Watts Single phase, 3 wire grounded 1,100 Watts full microwave power (IEC60705) Power Output 2,450 MHz Microwave Frequency 2M248J Magnetron 0 ~ 99 min. 99 sec. Timer...

  • 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 EARTHING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with This microwave oven is designed to be used in a fully a soft, damp cloth. Check for damage such as earthed condition.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Display Window Control Panel Safety Door Lock System Glass Tray Shaft Rotating Ring CONTROL PANEL 1. INDICATORS. 2. DISPLAY WINDOW. 3. SENSOR REHEAT: This menu has been pre programmed to cook food automatically by one touch.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions during oven operation. 7. EZ DEFROST 1. SETTING THE CLOCK STOP/CLEAR EZ DEFROST NUMBER STOP/CLEAR CLOCK NUMBER START 8. CHILD LOCK ex.) To set 4:30, touch number key [4],[3], and [0]. This oven has a CHILD LOCK feature NOTE: 1) This is a 12 hour clock.

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: 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 11: 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 12: Measurement With A Fully Assembled Oven

    MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed 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 13: 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 14 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 15 F. MAGNETRON REMOVAL G. REMOVING THE TURNTABLE MOTOR 1) Disconnect the leadwire from the magnetron. 1) Remove the turntable and rotating ring. 2) Lay the unit down on its back. 2) Carefully remove the mounting screws holding the 3) Remove the turntable motor cover. magnetron and the waveguide.

  • Page 16: 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 17: 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 FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH B.

  • Page 18: 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 19 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 20 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 21: 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 22 (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 23 (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 24 (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 25 (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 26: Exploded View

    EXPLODED VIEW INTRODUCTION SENSOR PARTS OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...

  • Page 27: Door Parts

    DOOR PARTS ECN Check 13581A 15006A 13552A 13536A 13213A 14890A 13720D 14026A 14970A...
  • Page 28 CONTROLLER PARTS 23572A 268711 ECN Check 23506C WTT028 24510L 24970A 250201 24781M...
  • Page 29 OVEN CAVITY PARTS 33112U WTT021 33052M 340511 WTT010 34960A 33390G 36549S 34370T 35889A WTP013...
  • Page 30 LATCH BOARD PARTS 43501A WSZ085 56912B 55262A 466001 466003 466001 43500A...
  • Page 31 INTERIOR PARTS WSZ002 ECN Check 568771 56411A 50FZZA 56930V 56201A 34930W 56549F WTT028 54974S WSZ196 55900A WTT037 WSZ002 WSZ002 35012A 50CZZH WSZ002 WSZ002 56851D 56324A 54810C WTT028 948502 56201B 56901A...
  • Page 32 BASE PLATE PARTS 56170D 63302L 647781 948503 WTT028 63302R WSZ002 63303L WTT021 63303R...
  • Page 33 SENSOR PARTS WTT021 ECN Check 54974T ECN Check 948501 56501A WTP002...

  • Page 34: Replacement Parts List

    REPLACEMENT PARTS LIST LOC. PART NO. DESCRIPTION ALTER 3828W5A2134 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 13213A 3213W1A028B DOOR FRAME ASSEMBLY 13536A 3536WRA001L SEAL TAPE 13552A 3552W1A037A CHOKE COVER 13581A 3581W1A250X DOOR ASSEMBLY 13720D 3720W0D180C PANEL,DOOR 14026A 4026W2A012A LATCH 14890A 4890W1A017K GLASS 14970A 4970WRA001C...
  • Page 35 LOC. PART NO. DESCRIPTION ALTER 56912B 6912W3B002D LAMP,DRAWING 56930V 6930WRT001C THERMOSTAT 6930W1A001J 63302L 3302W1A036A BASE PLATE 63302R 3302W1A035J BASE PLATE 63303L 3303W1A028A BASE PLATE ASSEMBLY 63303R 3303W2A004J BASE PLATE ASSY 647781 4B73900A 948501 4B73438T CUSHION 948502 4B73438L CUSHION 948503 3B72244G CUSHION WSZ002 1SBF0402418...
  • Page 36 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-324SCE ECN: MS-324SCE/01 LOC. PART NO. DESCRIPTION ALTER 3828W5A3025 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 3890W3L010D BOX,LABEL...
  • Page 37 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-324SCE ECN: MS-324SCE/01 LOC. PART NO. DESCRIPTION ALTER 568771 6877W1A181F HARNESS 56901A 6901WRH001B FUSE ASSEMBLY 56912B 6912W3B002D...
  • Page 38 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-324SCE ECN: MS-324SCE/02 LOC. PART NO. DESCRIPTION ALTER 3828W5A3786 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 3890W3L010D BOX,LABEL...
  • Page 39 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-324SCE ECN: MS-324SCE/02 LOC. PART NO. DESCRIPTION ALTER 568771 6877W1A181G HARNESS 56901A 6901WRH001B FUSE ASSEMBLY 56912B 6912W3B002D...
  • Page 40 LOC. PART NO. DESCRIPTION ALTER 3828W5A2134 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 13213A 3213W1A028B DOOR FRAME ASSEMBLY 13536A 3536WRA001L SEAL TAPE 13552A 3552W1A037A CHOKE COVER 13581A 3581W1A342B DOOR ASSEMBLY 13720D 3720W0D180G PANEL,DOOR 14026A 4026W2A012A LATCH 14890A 4890W1A017K GLASS 14970A 4970WRA001C SPRING 15006A 5006W3A017A...
  • Page 41 LOC. PART NO. DESCRIPTION ALTER 56912B 6912W3B002D LAMP,DRAWING 56930V 6930WRT001C THERMOSTAT 6930W1A001J 63302L 3302W1A036A BASE PLATE 63302R 3302W1A035J BASE PLATE 63303L 3303W1A028A BASE PLATE ASSEMBLY 63303R 3303W2A004J BASE PLATE ASSY 647781 4B73900A 948501 4B73438T CUSHION 948502 4B73438L CUSHION 948503 3B72244G CUSHION WSZ002 1SBF0402418...
  • Page 42 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01 LOC. PART NO. DESCRIPTION ALTER 3828W5A3025 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 3890W3L010L BOX,LABEL 13213A 3213W1A028B DOOR FRAME ASSEMBLY...
  • Page 43 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01 LOC. PART NO. DESCRIPTION ALTER 568771 6877W1A181F HARNESS 56901A 6901WRH001B FUSE ASSEMBLY 56912B 6912W3B002D LAMP,DRAWING 56930V 6930WRT001C...
  • Page 44 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02 LOC. PART NO. DESCRIPTION ALTER 3828W5A3786 MANUAL,OWNERS 3828W5S1991 MANUAL,SERVICE 3878W5B0006 COOK BOOK 3890W3L010L BOX,LABEL 13213A 3213W1A028B DOOR FRAME ASSEMBLY...
  • Page 45 Buyer Buyer Model Rating Label First check the rating label on the back of oven. and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02 LOC. PART NO. DESCRIPTION ALTER 568771 6877W1A181G HARNESS 56901A 6901WRH001B FUSE ASSEMBLY 56912B 6912W3B002D LAMP,DRAWING 56930V 6930W1A003A...

  • Page 46: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B.

  • Page 47: Printed Circuit Board

    PRINTED CIRCUIT BOARD Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/01 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01...
  • Page 48 PRINTED CIRCUIT BOARD Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/02 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02...

  • Page 49: P.c.b. Parts List

    P.C.B. PARTS LIST Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/01 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RZ1503G610...
  • Page 50 Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/01 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0TR107009AD TRANSISTOR,BIPOLARS KRC 107M KEC TP TO92M 50V 100MA...
  • Page 51 Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/01 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/01 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0ISS791500A IC,LINEAR KA7915 FAIRCHILD 3PIN TO220 BK...
  • Page 52 Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/02 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RZ1503G610 RESISTOR,DRAWING 150KOHM 1/4W 5% 3216 BULK 8 PIN...
  • Page 53 Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/02 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0TR387509AB TRANSISTOR,BIPOLARS KTC3875S-Y-T1(ALY) KEC TP TO92 50V...
  • Page 54 Buyer Buyer Model Rating Label First check the rating label on the back of oven. LGEAP MS-324SCE ECN: MS-324SCE/02 and order SVC parts accoding to ECN LGEAP MS-325SCE ECN: MS-325SCE/02 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 0RD2202F608 RESISTOR,FIXED CARBON FILM...
  • Page 55 Feb, 2002 P/NO : 3828W5S1991 Printed in Korea...

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