Table of Contents
Related Manuals for LG MS3042G
Summary of Contents for LG MS3042G
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Page 1: Microwave Oven
Internal Use Only Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS3042G CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. August, 2012 P/NO : MFL31039033 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 Model MS3042G Power Requirement 230/240 V~ 50 Hz Microwave 1 250 watt Single phase, 3 wire grounded Power Output 850 watt full microwave power (IEC60705) Microwave Frequency 2 450 MHz Magnetron 2M214 - 39F Timer 199min. 40sec. -
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 CONTROL PANEL 1. DISPLAY WINDOW: Used to show time of day, power level of cooking, cooking category. 2. AUTO COOK: Used to cook the foods listed by one touch. 3. AUTO DEFROST: Used to select the desired auto weight defrost programmed with weight pad. -
Page 8: Operating Sequence
OPERATING SEQUENCE The following is a description of component functions during oven operation. 8. AUTO DEFROST 1. SET CLOCK AUTO STOP/CLEAR START STOP/CLEAR CLOCK NUMBER START NUMBER DEFROST 9. QUICK DEFROST COOKING 2. CANCEL FUNCTION STOP/CLEAR Touch the pad whenever you need to QUICK STOP/CLEAR cancel an entry or a function currently in use. -
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: 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 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 –... -
Page 14: Diode Removal
D. DOOR 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.
- 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 microwave 2) Remove screws which hold the PCB SUB ASS’Y to activity when the door is opened during cooking 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 Cooking Start RELAY 2 Check for continuity of relay 2 with an ohm-meter. (Remove wire leads from relay 2 and operate the unit.) Relay 1 Relay 2 FAN MOTOR Measure the resistance. Normal: (Wire leads removed) (Ohm-meter scale: R x 100) A~B : Approx.
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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: Customer Model Product Code SVC Model OVEN CA VITY PARTS INTERIOR P ARTS BASE PLA TE P ARTS DOOR PARTS LA TCH BOARD P ARTS CONTROL PANEL PARTS -6-1-... -
Page 27: Door Parts
#EV# DOOR PARTS 13581A 13536A 13552A 13213A 13720D 14890A 14026A 14970A -6-2-... -
Page 28: Controller Parts
#EV# CONTROLLER PARTS 24781M 268711 23572A 23506A 24510L 250201 24970A -6-3-... -
Page 29: Oven Cavity Parts
#EV# OVEN CAVITY PARTS 33112U 33052A 33390G 35889A 36549S -6-4-... -
Page 30: Latch Board Parts
#EV# LATCH BOARD PARTS 43500A 466001 43501A 466003 466001 WSZ085 -6-5-... -
Page 31: Interior Parts
#EV# INTERIOR PARTS 568771 WSZ002 56411A 56930M 50FZZA 56201A 56549F WSZ062 55900A 54974S 56912B 56851D WSZ062 50CZZH 55262A WSZ002 54810C 56901A 34930W 56324A WSZ002 -6-6-... -
Page 32: Base Plate Parts
#EV# BASE PLATE PARTS 56170D 63303A WSZ002 -6-7-...