LG LCRM1240SW Service Manual
Lg microwave oven service manual
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Also See for LCRM1240SW:
- Owner's manual & cooking manual (32 pages) ,
- Owner's manual (31 pages)
Table of Contents
Troubleshooting
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Summary of Contents for LG LCRM1240SW
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Page 1: Microwave Oven
Website http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LCRM1240SW LCRM1240SB LCRM1240ST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. July, 2004 P/NO : 3828W5S3848 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
FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 1. Safety precautions ............................Inside front cover 2. -
Page 4: Specifications
SPECIFICATIONS ITEM DESCRIPTION LCRM1240SW MODEL LCRM1240SB LCRM1240ST Power Requirement 120 Volts AC 60 Hz (13.8A - MWO, 14.5A - Combo) Single phase, 3 wire grounded Microwave 1650W Coffee Maker 750W / 90W Power Output 1200 Watts full microwave power (IEC60705) -
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 microwave Though it is free from danger in ordinary use, energy which may radiate from the magnetron or extreme care should be taken during repair. 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 GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with a For personal safety, this appliance must be fully grounded soft, damp cloth. Check for damage such as misaligned at all times. -
Page 7: Overall Circuit Diagram
6. OVERALL CIRCUIT DIAGRAM A (I). SCHEMATIC DIAGRAM *Check the Rating Model No. - Page 8 A (II). SCHEMATIC DIAGRAM *Check the Rating Model No. (ADD Noise filter) FUSE 20A...
- Page 9 B. MATRIX CIRCUIT FOR TOUCH KEY BOARD...
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Page 10: Operating Procedures
7. OPERATING PROCEDURES A. OVEN CONTROL PANEL MICROWAVE CONTROL AREA 1. DISPLAY. The Display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected. 2. STOP/CLEAR. Touch this pad to stop the oven or clear entries. (microwave oven only) 3. - Page 11 B. EASY USE TABLE COFFEE MAKER MICROWAVE OVEN (1) BREW 1. Touch BREW. (1) KITCHEN TIMER 1. Touch STOP/CLEAR. (2) Small Batch 2. Touch KITCHEN TIMER. 1. Touch 1-4. 3. Touch correct number for time. 4. Touch START. (3) TIME SET. (2) CHILD LOCK 1.
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Page 12: Procedure For Measuring Microwave Energy Leakage
8. PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE A. CAUTIONS B. MEASURING MICROWAVE ENERGY LEAKAGE (1) Be sure to check a microwave emission prior to servicing (1) Pour 275 ± 15cc of 20 ± 5 °C water in a beaker which is the oven if the oven is operative prior to servicing. - Page 13 D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN G. POWER OUTPUT MEASUREMENT (1) After all components, including the outer panels, are (1) Fill the test beaker with 59 °F(15 °C) ~ 75 °F(24 °C) 1 liter tap fully assembled, measure for microwave energy water.
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Page 14: Disassembly Instructions
9. DISASSEMBLY INSTRUCTIONS IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELECTRICAL Remove reservoir and carafe OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E. - Page 15 C. DOOR GROSS ASSEMBLY REMOVAL (1) Open the door. (2) Remove the choke cover cap very carefully with a flat-blade screwdriver. CAUTION : Be careful not to damage door seal plate by screwdriver. (3) Lift up and push the door. NOTE: 1.
- Page 16 D. MAGNETRON REMOVAL E. REMOVING THE TURNTABLE MOTOR (Figure 10) (Figure 11) 1) Disconnect the wire lead from the magnetron. 1) Remove the turntable and rotating ring. 2) Carefully remove the mounting screws holding the 2) Lay the unit down on its back. magnetron and the waveguide.
- Page 17 F. HIGH VOLTAGE TRANSFORMER REMOVAL I. INTERLOCK SYSTEM 1) Discharge the high voltage capacitor. 1) INTERLOCK MECHANISM 2) Disconnect the leadwire from magnetron, high voltage The door lock mechanism is a device which has been transformer, and capacitor. specially designed to eliminate completely microwave 3) Remove the screw holding the high voltage transformer to activity when the door is opened during cooking and thus the baseplate.
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Page 18: Interlock Continuity Test
10. 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 19: Test And Checkout Procedures,And Troubleshooting
11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING 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 20 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 1. Check DC 9V battery before performing Normal: Approximately 9V CAPACITOR tests.
- Page 21 COMPONENTS TEST PROCEDURE RESULTS H.V.Diode (rectifer) STEP 1. Test the diode to see if it is shorted. Procedure: 1. Select the Ω scale on the meter. 2. Place the meter leads across the diode as pictured in Figure 14-a. The reading should be “40MΩ,”...
- Page 22 COMPONENTS TEST PROCEDURE RESULTS RELAY 2 1. Measure continuity. POWER (Power Relay) 2. Remove the lead wires and operate oven LEVEL at power level 1 through power level 10. 4 sec 18 sec 6 sec 16 sec 8 sec 14 sec 10 sec 12 sec 12 sec...
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Page 23: Checkout Procedures
B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION: REPLACE BLOWN FUSE WITH 15 AMPERE FUSE. PROBLEMS CAUSES Fuse blows immediately after Improper operation of the primary interlock, the door is closed. secondary interlock switches and/or the interlock monitor switch. Fuse blows immediately after the door is opened. - Page 24 (2) CHECKOUT PROCEDURES FOR RELAY. Microwave Oven Coffee maker - PROBLEM (A) - - PROBLEM (A) - FAN motor and oven lamp turn on without touching FAN motor turn on without touching START key when START key when the door is closed. the door is closed.
- Page 25 (3) CHECKOUT PROCEDURES FOR CIRCUIT BOARD The following symptoms indicate a defective circuit board. (1) The start function fails to operate but the high (4) Some segments of one or more digits do not light up, or voltage Systems, the interlock switches, the door they continue to light up, or segments light when they sensing and the relay check good.
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Page 26: Troubleshooting
C. 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 COFFEE MAKER AND MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. - Page 27 (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 28 (TROUBLE 2) Microwave 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 29 (TROUBLE 3) Display shows all figures set, but microwave 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 30 (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 31 (TROUBLE 6) When Microwave oven operates, strange cook can be seen on the display and stop with beep sound. CONDITION CHECK RESULT CAUSE REMEDY Defective PCB Replace PCB Check the CN5 “F-4 ” code Attached assembly or assembly or connector sensor assembly sensor assembly inserted tightly.
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Page 32: Exploded View
#EV# EXPLODED VIEW INTRODUCTION -31-... -
Page 33: Door Parts
#EV# DOOR PARTS 13552A 15006A 13581A 13536A 13213A 14890A 14026A 14970A WTP004 268711 For model 13551A LCRM1240ST 13720D WTT028 13650A 23506A -32-... -
Page 34: Oven Cavity Parts
#EV# OVEN CAVITY PARTS WSZ185 33112U 33052A For model LCRM1240SW LCRM1240ST WTT010 WTT047 For model LCRM1240SB 33390G 35889A 36549S WTP013 -33-... -
Page 35: Latch Board Parts
#EV# LATCH BOARD PARTS WSZ085 56912B 466001 466003 43500A 55262A 466001 -34-... - Page 36 #EV# OVEN INTERIOR PARTS (I) Check the rating label of Model and order SVC parts according to the Model No. Model: LCRM1240SW LCRM1240SB LCRM1240ST * Check the Rating Model No. * Check the Rating Model No. 568771 WSZ002 56411A 50FZZA...
- Page 37 #EV# OVEN INTERIOR PARTS (II) Check the rating label of Model and order SVC parts according to the Model No. Model: LCRM1240SW / 01 LCRM1240SB / 01 LCRM1240ST / 01 * Check the * Check the Rating Model No. Rating Model No.
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Page 38: Base Plate Parts
#EV# BASE PLATE PARTS 56170D 63302A 63303A 65006A 647781 WTT021 WTT028 WSZ002 WTT021 -37-... - Page 39 #EV# SENSOR PARTS WTP004 WTT021 56501A 54974T -38-...
- Page 40 #EV# COFFEE MAKER PARTS For model 83551T LCRM1240ST 83551E 83111A 83720A 83496A 839203 85201A WTT028 839201 83550C 85220V 84510L WTP015 852001 85220P 849702 852002 83110L For model 83551F LCRM1240ST 839202 84838W For model 83720E 83551A LCRM1240ST WTC004 WTT028 85301A 85220V 86322A 83650A For model...