Related Manuals for LG MS-3446VR
Summary of Contents for LG MS-3446VR
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Page 1: Microwave Oven
Website http://biz.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: MS-3446VR CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2006 P/NO : MFL31039001 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 INSTALLATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1... -
Page 4: Specifications
SPECIFICATIONS ITEM DESCRIPTION MODEL MS-3446VR Power Requiremen 230/240 Volts AC 50 Hz 1600 Watts Single phase, 3 wire grounded Power Output 1100 Watts full microwave power (IEC60705) Microwave Frequency 2450 MHz 2M246-050GF 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: Installation
INSTALLATION BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING EARTHING INSTRUCTIONS This microwave oven is designed to be used in a fully 1. Empty the microwave oven and clean inside it with earthed condition. a soft, damp cloth. Check for damage such as It is imperative, therefore, to make sure it is properly misaligned door, damage around the door or dents earthed before servicing... -
Page 7: Operating Instructions
OPERATING INSTRUCTIONS FEATURES CONTROL PANEL 1. DISPLAY WINDOW. 2. SENSOR REHEAT. 3. SENSOR COOK. 4. AUTO COOK. 5. MORE / LESS: All of the one touch cook and TIMED COOK can be adjusted to cook food for a longer or shorter time. MORE Pressing MORE will add 10 seconds to the cooking time. -
Page 8: Operating Sequence
OPERATING SEQUENCE 6. CHILD LOCK The following is a description of component functions during oven operation. This oven has a CHILD LOCK feature TO SET CHILD LOCK 1. CANCEL FUNCTION • Touch STOP/CLEAR pad Touch the STOP/CLEAR pad whenever you need to •... -
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: 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 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. 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 Remove door assembly E.
- Page 15 F. AIR DUCT ASSEMBLY REMOVAL H. REMOVING THE TURNTABLE MOTOR 1) Disconnect the leadwire from the lamp. 1) Remove the turntable and rotating ring. 2) Remove the mounting screw to the magnetron. 2) Lay the unit down on its back. 3) Remove the turntable motor cover.
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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 lead wire 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 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 10 sec 12 sec 12 sec 10 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 Defective PCB No microwave 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-3446VR OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PLATE PARTS LATCH BOARD PARTS CONTROL PANEL PARTS... - Page 27 #EV# DOOR PARTS 15006A 13581A 13552A 13536A 13213A 13551A 14026A 14970A...
- Page 28 #EV# CONTROL PANEL PARTS 24781M 23551A 268711 WTP018 24510L 24970A 23551B...
- Page 29 #EV# OVEN CAVITY PARTS WTT021 33112U 33052A WTT010 33390G 36549S 35889A WTP013...
- Page 30 #EV# LARCH BOARD PARTS WSZ085 466001 43501A 43500A 466003 466001...
- Page 31 #EV# INTERIOR PARTS 568771 WSZ062 56411A WTT021 WTP004 56501A 54974T 50FZZA 56930V 56201A 34930W 56549F WTT028 54974S WSZ002 55900A WTT037 WSZ002 WTT028 50CZZH 35012A WSZ002 54810C 56912B WSZ002 56324A WTT028 WSZ002 55262A 56851D 948502 56901A 56201B...
- Page 32 #EV# BASE PLATE PARTS 56170D 63302A 63303A 948501 65006B WSZ002 WTT021...
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Page 33: Replacement Parts List
REPLACEMENT PARTS LIST Rev.1 May 09, 2006 LOC. PART NO. DESCRIPTION ALTERNATE 382885A0063 Manual,Owners MFL31039001 Manual,Service 3850W1D089C Label,Cooking Guide 389083C034A Box,Color 13213A 3213W1A031P Frame Assembly,Door 13536A 3536W1A004A Tape,Sealing 13551A AGM30368401 Parts Assembly 13552A 3552W0A012A Cover,Choke 13581A 358180A004A Door Assembly 14026A 4026W2A016A Locker 14970A... - Page 34 LOC. PART NO. DESCRIPTION ALTERNATE 63303A 3303W0A019B Plate Assembly,Base 65006B 5006W3A019A Cap,Base Plate 948501 3B72244T Damper 948502 3B72244G Damper WSZ002 1SBF0402418 Screw,Taptite WSZ062 4000W4A003A Screw,Customzied WSZ085 4B70188C Screw,Customzied WTP004 1TPL0302418 Screw,Tapping WTP013 1TPL0402418 Screw,Tapping WTP018 1TPL0402818 Screw,Tapping WTT010 1TTL0402416 Screw,Tapping WTT021 1TTL0402418 Screw,Tapping...