Related Manuals for LG MS-3237BL
Summary of Contents for LG MS-3237BL
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Page 1: Microwave Oven
Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS-3237BL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2007 P/NO : MFL32514607 Printed in Korea... -
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-3237BL MODEL Power Requirement 230 Volts AC 50 Hz Single phase, 3 wire grounded Microwave 1 250W Power Output 850 Watts full microwave power (IEC60705) 2 450 MHz Microwave Frequency Magnetron 2M167B - M47J1 Timer 0 ~ 99 Min. -
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 GLASS TRAY ROLLER REST CONTROL PANEL 1. DISPLAY WINDOW: Used to show time of day, power level of cooking, cooking category. 2. CLOCK: Used to set the time of day. 3. -
Page 8: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. SETTING THE CLOCK Stop Clock Set the hour Clock Set the Clock minutes NOTE: 1) You can set 12 hour clock or 24 hour clock optionally. 2) Clock will operate as long as power is applied to the oven. -
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 MEASURING INSTRUMENTS NECESSARY TOOLS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC, Ohmmeter) • Microwave survey meter Standard tools are listed below. - Holaday HI-1500 • Diagonal 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 from the following formula : the microwave oven supplied at its rated voltage and operated at its maximum microwave power setting with 4187 X (∆T) + 0.55 X (T ) X M a load of (1000 ±... -
Page 14: Diode Removal
D. DOOR GROSS ASSEMBLY REMOVAL E. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Open the door. 2) Remove the choke cover very carefully with a 1) Discharge the high voltage capacitor. flat-blade 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 J. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable. 1) Disconnect the leadwire from lamp. 2) Remove the turntable shaft VERY CAREFULLY 2) Remove the mounting screw to Latch Board. with a slotted screwdriver. 3) Lay the unit down on its back. I.
- 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.
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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 A. -
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 RELAY 2 Check for continuity of relay 2 with an 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 Relay 1 10 sec 12 sec 12 sec...
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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 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. of secondary does not count switch (with...
- 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.
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Page 26: Exploded View
#EV# EXPLODED VIEW INTRODUCTION MODEL: MS-3237BL OVEN CAVITY PARTS INTERIOR PARTS BASE PLATE PARTS DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... -
Page 27: Door Parts
#EV# DOOR PARTS 13581A 13536A 13552A 13213A 13720D 14890A 14026A WTT028 14970A 13650A... -
Page 28: Controller Parts
#EV# CONTROLLER PARTS WTP013 268712 268711 23572A 23806C 25020M 24940P WTP004 25020S 24940T 24781S... -
Page 29: Oven Cavity Parts
#EV# OVEN CAVITY PARTS 33112U WTT010 33052A 33390G 35889A 36549S WTP013... -
Page 30: Latch Board Parts
#EV# LATCH BOARD PARTS WSZ085 466001 43500A 43501A 466003 44510A 466001... -
Page 31: Interior Parts
#EV# INTERIOR PARTS 568771 WSZ062 56411A 56930V 50FZZA 56201A WTT028 56549F 54974S WSZ002 55900A WTT037 WSZ002 50CZZH 56912B 56851D 948501 WSZ002 55262A WSZ002 54810C WTT028 34930W 56324A WSZ002... -
Page 32: Base Plate Parts
#EV# BASE PLATE PARTS 56170D 63302A...