LG MS-2352F Service Manual
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LG MS-2352F Service Manual

LG MS-2352F Service Manual

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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MS-2352F
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

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Summary of Contents for LG MS-2352F

  • Page 1 MICROWAVE OVEN SERVICE MANUAL MODEL: MS-2352F 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 MS-2352F MODEL 230 Volts AC 50 Hz Power Requirement 1,200 Watts Single phase, 3 wire grounded Power Output 800 Watts full microwave power (IEC 60705) 2,450 MHz Microwave Frequency Magnetron 2M214 - 39F 0 ~ 99 min. 50 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 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 Control Panel Safety Door Lock System Turntable Grill Rack Rotating Ring CONTROL PANEL 1. CLOCK: Used to set the time of day. 2. POWER: Used to select the desired power level for cooking.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions during oven operation. 6. AUTO DEFROST COOKING 1. SETTING THE CLOCK NUMBER OF AUTO STOP/CLEAR WEIGHT START STOP/CLEAR CLOCK NUMBER CLOCK DEFROST (kg) NOTE: 1) This is a 24 hour clock. 7.

  • Page 9: Schematic Diagram

    SCHEMATIC DIAGRAM...

  • Page 10: Circuit Description

    CIRCUIT DESCRIPTION • A high voltage of approximately 2100 volts AC is GENERAL DETAILS 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 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) + 0.55 X (T ) X M a load of (1000±5) g of potable water.
  • Page 14 D. DOOR GROSS ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER 1) Open the door. REMOVAL 2) Remove the choke cover very carefully with a flat-blade 1) Discharge the high voltage capacitor. screwdriver. 2) Disconnect the leadwire from magnetron, high voltage CAUTION : Be careful not to damage door seal plate transformer, and capacitor.
  • Page 15 H. AIR DUCT ASSEMBLY REMOVAL L. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable. 1) Disconnect the leadwire from the lamp. 2) Remove the turntable shaft VERY CAREFULLY. 2) Remove the mounting screw to the latch board. 3) Lay the unit down on its back. 4) Remove the turntable motor cover.
  • Page 16 K. PCB ASSEMBLY REMOVAL L. INTERLOCK SYSTEM 1) Remove the control panel assembly from the 1) INTERLOCK MECHANISM cavity. (Refer to control panel assembly removal The door lock mechanism is a device which has on previous page.) been specially designed to eliminate completely 2) Remove screws which hold the PCB SUB ASS’Y to microwave activity when the door is opened during the control panel.

  • 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 Terminals 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)
  • 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.) 6 sec 16 sec 10 sec 12 sec Relay 1 14 sec 8 sec Relay 2 18 sec 4 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. monitor switch. primary, monitor of monitor switches, and 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 (TROUBLE 5) No microwave oscillation even though oven lamp and fan motor run. (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective PCB Replace PCB Output is full power Disconnect the Abnormal. assembly. assembly. when you set lower wire leads from power level.

  • Page 27: Exploded View

    EXPLODED VIEW INTRODUCTION OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...
  • Page 28 DOOR PARTS 13581A 13536A 13552A 13213A 13352A 13720D 14026A 14970A WTT028 13650A...
  • Page 29 CONTROL PANEL PARTS 24781M 268711 WTP004 250201 23572A 250202 243501 23790D 250203 250204 250205...
  • Page 30 OVEN CAVITY PARTS WTT021 33112U 33052A 33390G 34370T 36549S 35889A WTP013...
  • Page 31 LATCH BOARD PARTS 43501A 43500A WSZ084 466001 466003 466001 44510A...
  • Page 32 INTERIOR PARTS 568771 WSZ062 56411A 56930V 50FZZA 56201A WTT028 56549F WSZ002 55900A WTT037 54974S 50CZZH 56912B WSZ002 56851C 55262A 54810C WTT028 56324A WSZ002...
  • Page 33 BASE PLATE PARTS 56170D 63302A 63303A 948501 WTT021 65006B WSZ002...

  • Page 34: Replacement Parts List

    REPLACEMENT PARTS LIST LOC. PART NO. DESCRIPTION ALTER 3828W5A3017 MANUAL,OWNERS 3828W5S2918 MANUAL,SERVICE 3890W3W352A BOX,WHITE 13213A 3213W1A027N DOOR FRAME ASSEMBLY 13352A 3352W1A136B FRONT SCREEN 13536A 3536WRA001J SEAL TAPE 13552A 3552W1A036A CHOKE COVER 13581A 3581W1A353K DOOR ASSEMBLY 13650A 3650W1A079A HANDLE,DOOR 13720D 3720W0D258B PANEL,DOOR 14026A 4026W2A023A...
  • Page 35 LOC. PART NO. DESCRIPTION ALTER 56411A 2B73671A POWER CORD ASSEMBLY 2B73671M 56549F 6549W1F005A MOTOR(CIRC),FAN 6549W1F008A 56851D 6021W3B001Q CABLE ASSEMBLY 6021W3B001M 568771 6877W1A385B HARNESS 56912B 6912W3B002D LAMP,DRAWING 6912W3B002J 56930V 6930W1A003A THERMOSTAT 6930WRT002F 56930V 6930W1A003A THERMOSTAT 6930W1A001J 56930V 6930W1A003A THERMOSTAT 6930WRT001C 56930V 6930W1A003A THERMOSTAT 6930W1A004A...

  • Page 36: Schematic Diagram Of P.c.b

    SCHEMATIC DIAGRAM OF P.C.B...

  • Page 37: Printed Circuit Board

    PRINTED CIRCUIT BOARD...

  • Page 38: P.c.b Parts List

    P.C.B PARTS LIST LOC. PART NO. DESCRIPTION SPECIFICATION ALTER 6908W3YA01C BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70D 6908W3YA01A 6908W3YA01C BUZZER TFM-57 CW NINGBO EAST PIEZO 2048HZ 70D 6908W3YA01B 0CE4776H618 CAPACITOR,FIXED ELECTROLYTIC 470UF SMS,SG 25V 20% FL TP 5 0CE4776H618 CAPACITOR,FIXED ELECTROLYTIC 470UF SMS,SG 25V 20% FL TP 5 0CE1076D638...
  • Page 39 LOC. PART NO. DESCRIPTION SPECIFICATION ALTER Q122 0TRAU90018A TRANSISTOR,BIPOLARS AUK KOREA 2SA1980G-AT TP TO92M 50V 150MA 0TR126609AA Q122 0TRAU90018A TRANSISTOR,BIPOLARS AUK KOREA 2SA1980G-AT TP TO92M 50V 150MA 0TRFC80002A Q123 0TRAU90018A TRANSISTOR,BIPOLARS AUK KOREA 2SA1980G-AT TP TO92M 50V 150MA 0TR126609AA Q123 0TRAU90018A TRANSISTOR,BIPOLARS AUK KOREA 2SA1980G-AT TP TO92M 50V 150MA...
  • Page 40 JQ1A-12V MATSUSHITA 250VAC 5A 12VDC 1A N 6920W2D010A 6920WRD008A RELAY JQ1A-12V MATSUSHITA 250VAC 5A 12VDC 1A N 6920W2D010B 6920W5A012A RELAY G5G-1A-DT1-LG OMRON 250VAC 16A 12VDC 1A 6600RRT001B SWITCH,TACT VERTICAL IN SUNG 12V 50MA UL,CSA SW10 6600RRT001B SWITCH,TACT VERTICAL IN SUNG 12V 50MA UL,CSA 6600RRT001B...
  • Page 41 Jan., 2003 P/NO:3828W5S2918 Printed in Korea...

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