LG LMV1683ST Manuel utilisateur

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MICROWAVE OVEN

SERVICE MANUAL

MODEL: LMV1683ST

LMV1683SB

LMV1683SW

CAUTION

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

P/NO : MFL30474304

March, 2012

Printed in Korea

Website: http://biz.lgservice.com

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Internal Use Only

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CAUTION

WARNING TO SERVICE TECHNICIANS

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.

• Proper operation of the microwave ovens requires that the magnetron be assembled to the wave guide 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.

• Routine service safety procedures should be exercised at all times.

• Untrained personnel should not attempt service without a thorough review of the test procedures and safety

information contained in this manual.

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.

CONTENTS

(Page)

Safety Precautions .............................................................................................................................................. 2

1. Specification .................................................................................................................................................... 4

2. Cautions ........................................................................................................................................................... 5

3. Installation ....................................................................................................................................................... 6

4. Operation ......................................................................................................................................................... 7

4-1. Control Panel Features .............................................................................................................................. 7

4-2. Explanation of Control Panel...................................................................................................................... 8

5. Wiring Diagram / Key Matrix........................................................................................................................... 9

5-1. Wiring Diagram .......................................................................................................................................... 9

5-2. Key Matrix ............................................................................................................................................... 10

6. Troubleshooting ............................................................................................................................................ 11

6-1. General Information for Service ............................................................................................................... 11

6-2. Safety Caution.......................................................................................................................................... 12

6-3. Basic Check Summary............................................................................................................................. 13

6-4. Troubleshooting ....................................................................................................................................... 14

7. Microwave Leakage Test .............................................................................................................................. 25

8. Power Output Measurement......................................................................................................................... 27

9. Interlock System............................................................................................................................................ 28

9-1. Interlock Mechanism ................................................................................................................................ 28

9-2. Interlock Continuity Test........................................................................................................................... 30

10. Component Testing Information................................................................................................................ 31

11. Disassembly Instructions........................................................................................................................... 35

12. Exploded View ............................................................................................................................................. 42

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1. SPECIFICATIONS

Rated Power Consumption ................................ 1500W maximum

(Microwave oven+Cook top lamps+Ventilation fan)

Microwave Output ............................................... 1000W (IEC60705)

Frequency .......................................................... 2450 MHz ±50 MHz

Power Supply ..................................................... 120 VAC, 60 Hz

Rated Current .................................................... 14 Amp. (Microwave oven+Cook top lamps+Ventilation fan)

Magnetron Cooling ............................................. Forced Air Cooling

Rectification ....................................................... Rectification Voltage Double Half-Wave

Door Sealing ...................................................... Choke System

Safety Devices ................................................... Oven Thermostat: Open at 90 °C ± 5 °C

Close at 0 °C ± 5 °C

............................................................................ Fuse (20A)

............................................................................ Primary Interlock Switch

............................................................................ Secondary Interlock Switch

............................................................................ Interlock Monitor Switch

Magnetron .......................................................... 2M214 - 161GP

Cook top Lamp ................................................... 125 V, 30 W or 40 W

Cavity Lamp ....................................................... 125 V, 30 W or 40 W

Timer .................................................................. Digital, up to 99 min. 99 sec. (in each cooking stage)

Tray .................................................................... Tempered Safety Glass

Overall Dimensions ............................................ 2915/16” (W) x 167/16” (H) x 1615/16” (D)

Oven Cavity Size ............................................... 219/16” (W) x 141/8” (H) x 83/4” (D)

Effective Capacity of Oven Cavity ...................... 1.6 Cu.ft.

Accessories ........................................................ Owner’s Manual & Cooking Guide, Installation Manual,

............................................................................ Exhaust Adapter, Exhaust Damper, Mounting Kit and Filter,

............................................................................ Glass Tray, Metal Rack, Rotating Ring Assembly.

SWITCH CHART

SWITCH MODE

CONDITIONS

DOOR OPEN OPEN OPEN CLOSE

CLOSE CLOSE OPEN

DOOR CLOSED

PRIMARY

INTERLOCK

SWITCH

SECONDARY

INTERLOCK

SWITCH

INTERLOCK

MONITOR

SWITCH

COM

NOTE: Use the above switch chart with circuit diagram on page 5-1.

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2. 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.

• 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.

• 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.

THE OVEN IS TO BE SERVICED ONLY

BY PROPERLY QUALIFIED SERVICE

PERSONNEL.

Gasket

ANTENNA

COOLING FIN

MAGNETRON

CHASSIS GROUND FILAMENT

TERMINALS

MAGNETRON

-6-

3. INSTALLATION

BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY.

PRECAUTIONS ON INSTALLATION

A. Plug the power supply cord into a 120V AC, 60Hz,

single-phase power source with a capacity of at

least 20 amperes.

B. Avoid placing the unit in a location where there is

direct heat or splashing water.

C. Install the unit on the mounting plate firmly.

D. Place the unit as far away as possible from TV,

radio, etc. to prevent interference.

GROUNDING INSTRUCTIONS

For personal safety, this appliance must be fully

grounded at all times.

In the event of an electrical short circuit, grounding

reduces the risk of electrical shock.

The plug must be plugged into an outlet that is

properly installed and grounded.

CAUTION

This unit is equipped with a 3-prong plug for your

safety. If the wall outlet is a grounded 3-hole type,

the unit will be grounded automatically.

WARNING

Improper use of the grounding plug can result in a

risk of electric shock.

Do not, under any circumstances, cut or remove the

third ground prong from the power cord plug.

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4. OPERATION

4-1. Control Panel

-8-

4-2. Explanation of Control Panel

1. DISPLAY The Display includes a clock and

indicators to tell you time of day, cooking time

settings and cooking unctions selected.

2. POPCORN Touch this pad when popping popcorn

in your microwave oven.

3. POTATO Touch this pad when roasting potato in

your microwave oven.

4. PIZZA Touch this pad when roasting pizza in your

microwave oven.

5. FROZEN ENTREE Touch this pad to select

frozen entree.

6. AUTO COOK Touch this pad to cook fresh

vegetable, frozen vegetable, rice, or casseroles.

7. AUTO REHEAT Touch this pad to reheat dinner

plate, soup/sauce, casserole, roll/muffin.

8. SOFTEN Touch this pad to soften butter, ice

cream, cream cheese, frozen juice.

9. MELT Touch this pad to melt butter or margarine,

chocolate, cheese, marshmallow.

10. AUTO DEFROST Meat, poultry, fish. Touch this

pad to select food type and defrost food by

weight.

11. TIME DEFROST This pad provides you with the

RAPID defrosting method for 1.0 pound frozen

foods.

12. TIME Touch this pad to set a cooking time.

13. CLOCK Touch this pad to enter the time of day.

14. POWER LEVEL Touch this pad to select a

cooking power level.

15. NUMBER Touch number pads to enter cooking

time, power level, quantities or weights.

16. START/ENTER Touch this pad to start a

function. If you open the door after oven begins

to cook, retouch START/ENTER.

17. STOP/CLEAR Touch this pad to stop the oven

or clear all entries.

18. LIGHT ON/OFF Touch this pad to turn the

cooktop/countertop light on or off.

19. VENT HI/LOW/OFF Touch this pad to turn the

Vent on or off.

20. ADD 30 SEC Touch this pad to control the add

30sec. cook time.

-9-

5. WIRING DIAGRAM / KEY MATRIX

5-1. Wiring Diagram

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5-2. Key Matrix

KEY MATRIX

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