LG LCRM1240_Service_Manual.pdf

Website http://us.lgservice.com

MICROWAVE OVEN

MODEL: LCRM1240SW

LCRM1240SB

LCRM1240ST

CAUTION

BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

P/NO : 3828W5S3848

July, 2004

Printed in Korea

SERVICE MANUAL

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

A) Do not operate or allow the oven to be operated with the door open.

B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary; (1) interlock operation, (2) proper door closing, (3) seal

and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5)

evidence of dropping or abuse.

C) Before turning on microwave power for any service test or inspection within the microwave generating

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,

integrity, and connections.

D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and

transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before

the oven is released to the owner.

E) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed

on each oven prior to release to the owner.

CAUTION

MICROWAVE RADIATION

DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE GENERATOR

OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.

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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. Specifications .............................................................................................................................................. 3

3. Cautions ...................................................................................................................................................... 4

4. Installations ................................................................................................................................................. 5

5. Overall Circuit Diagram ............................................................................................................................... 6-7

6. Operating Procedures ................................................................................................................................. 8-9

7. Procedure for Measuring Microwave Energy Leakage .............................................................................. 10-11

8. Disassembly Instructions ............................................................................................................................ 12-15

9. Interlock Continuity Test ............................................................................................................................. 16

10. Test and Checkout Procedures,and Troubleshooting

A. Test Procedures ----------------------------------------------------------------------------------------------------------------------- 17-20

B. Checkout Procedures ---------------------------------------------------------------------------------------------------------------- 21-23

C. Troubleshooting ------------------------------------------------------------------------------------------------------------------------ 24-29

11. Exploded View .......................................................................................................................................... 30-37

12. Replacement Parts List ............................................................................................................................. 38-44

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SPECIFICATIONS

ITEM

DESCRIPTION

MODEL

LCRM1240SW

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)

Microwave Frequency

2450 MHz

Magnetron

2M246 - 050GF

Timer

0 ~ 59 sec. ,0 ~ 99 min.

Outside Dimensions

23”(W)x 12 1 / 2 ”(H)x 17 1 / 8 ”(D)

Cavity Dimensions

14 11 / 16 ”(W)x 9 5 / 8 ”(H)x 15 5 / 8 ”(D)

Net Weight

15.9 kg (approx.)

Shipping weight

17.3 kg (approx.)

Control Complement

Microwave Power for Variable Cooking

Power level

MAX ...................................... Full power throughout the cooking time

MED.-HIGH ............................ approx. 80% of Full power

MEDIUM ................................ approx. 60% of Full power

DEFROST .............................. approx. 40% of Full power

LOW/WARM ........................... approx. 20% of Full power

COFFEE MAKER, COMBI

Nameplate Location

Back Side

Accessories

Owner's manual

Glass turntable

Roller rest

This microwave oven is designed for household use only.

It is not recommended for commercial purposes.

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CAUTIONS

Unlike other appliances, the microwave oven is

high-voltage and high-current equipment.

Though it is free from danger in ordinary use,

extreme care should be taken during repair.

MICROWAVE RADIATION

Personnel should not be exposed to the microwave

energy which may radiate from the magnetron or

other microwave generating device if it is improperly

used or connection.

All input and output microwave connections,

waveguide, flange and gasket must be secure

never operate the device without a microwave

energy absorbing load attached.

Never look into an open waveguide or antenna

while the device is energized.

• DO NOT operate on a 2-wire extension cord during repair

and use.

• NEVER TOUCH any oven components or wiring during

operation.

• BEFORE TOUCHING any parts of the oven, always remove

the power plug from the outlet.

• For about 30 seconds after the oven stops, an electric

charge remains in the high voltage capacitor. When

replacing or checking, you must discharge the high voltage

capacitor by shorting across the two terminals with an

insulated screwdriver.

• Proper operation of the microwave oven requires that the

magnetron be assembled to the waveguide and cavity.

Never operate the magnetron unless it is properly installed.

• Be sure that the magnetron gasket is properly installed

around the dome of the tube whenever installing the

magnetron.

ANTENNA

Gasket

COOLING FIN

FILAMENT

TERMINALS

MAGNETRON

CHASSIS GROUND

• Remove your watches whenever working close to or

replacing the Magnetron.

• DO NOT touch any parts of the control panel circuit. A

resulting static electric discharge may damage this P.C.B.

• NEVER operate the oven with no load.

• NEVER injure the door seal and front plate of the oven

cavity.

• NEVER put iron tools on the magnetron.

• NEVER put anything into the latch hole and the interlock

switches area.

MAGNETRON

THE OVEN IS TO BE SERVICED ONLY BY

PROPERLY QUALIFIED SERVICE

PERSONNEL.

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