LG LMVM2033SW Manual de usuario

MICROWAVE OVEN

SERVICE MANUAL

MODEL: LMVM2033SW

LMVM2033SB

LMVM2033ST

CAUTION

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

P/NO : MFL06272535

June, 2014

Printed in Korea

Internal Use Only

-2-

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 oven 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.

-3-

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. Specifications ........................................................................................................................................................4

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

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

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

4-1. Control Panel...................................................................................................................................................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. Self diagnosis (humidity Sensor and PCB thermistor check) & Error code ...................................................12

6-4. Basic Check Summary ..................................................................................................................................13

6-5. Troubleshooting .............................................................................................................................................14

7. Microwave Leakage Test.....................................................................................................................................24

8. Power Output Measurement...............................................................................................................................26

9. Interlock System..................................................................................................................................................27

9-1. Interlock Mechanism......................................................................................................................................27

9-2. Interlock Continuity Test.................................................................................................................................29

10. Component Testing Information ......................................................................................................................30

11. Disassembly Instructions .................................................................................................................................34

12. Exploded View ...................................................................................................................................................40

-4-

1. SpecificationS

Rated Power Consumption ................................ 1600W 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 TCO 110/0

............................................................................ MGT TCO 180/60

............................................................................ Bottom TCO : 145/0

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

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

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

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

Magnetron ......................................................... 2M246 - 050GP

Cook Top Lamp ................................................. Halogen lamp ,130V,50W

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 ........................................... 2914/16” (W) x 16 7/16” (H) x 15 13/16 ” (D)

Oven Cavity Size ............................................... 22 (W) x 115/8” (H) x 14 5/8” (D)

Effective Capacity of Oven Cavity ..................... 2.0Cu.ft.

Accessories ....................................................... Ownerʼs Manual & Cooking Guide, Installation Manual,

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

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

SWITCH CHART

SWITCH MODE PRIMARY

INTERLOCK

SWITCH

SECONDARY

INTERLOCK

SWITCH

INTERLOCK

MONITOR

SWITCH

CONDITIONS COM

COM

DOOR OPEN OPEN OPEN CLOSE

DOOR CLOSED CLOSE CLOSE OPEN

NOTE: Use the above switch chart with wiring diagram on page 9.

-5-

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 connected.

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 the

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 electric 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.

-7-

4. operation

4-1. Control Panel

9 10 11 12 13 1487654321

21 22 23 24 2515 16 17 18 19 20

-8-

4-2. Explanation of Control Panel

1. AUTO REHEAT Press this button to reheat dinner

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

2. AUTO COOK Press this button to cook fresh

vegetables, frozen vegetables, rice, or casseroles.

3. POPCORN Press this button when popping

popcorn in your microwave oven.

4. DEFROST Touch this button to defrost frozen

food.

5. SOFTEN Press this button to soften butter, ice

cream, cream cheese, or frozen juice.

6. MELT Press this button to melt butter or

margarine, chocolate, cheese, or marshmallows.

7. CUSTOM COOK Touch this button to make oven

remember Cook time and Power level.

8. POWER LEVEL Press this button to select a

cooking power level.

9. DISPLAY The Display includes a clock and

indicators to tell you the time of day, cooking time

settings and cooking functions selected.

10. NUMBER Press this button to enter cooking

time, power level, quantities or weights.

11. +, - Touch this button to add or subtract ten

seconds of cooking time each time you touch it.

12. ADD 30 SEC Press this button to control the add

30sec. cook time.

13. START/ENTER Press this button to start a

function. If you open the door after oven begins

to cook, press START/ENTER again.

14. LIGHT HIGH/LOW/OFF touch this button to turn

the cooktop/coutertop light on high/low or off.

15. KIDS MEAL Select type of dish to reheat

HOT DOG, MAC & CHEESE or CHICKEN

NUGGETS.

16. CLOCK Press this button to enter the time of

day.

17. TIMER

18. COOK TIME Press this button to set a cooking

time.

19. CUSTOM SET Touch this pad to change the

oven's default setting for sound, clock, disply

speed, and defrost weight.

20. TURNTABLE ON/OFF

21. ENERGY SAVING Press this button to save

energy.

22. STOP/CLEAR Press this button to stop the oven

or clear all entries.

23. VENT ON/OFF touch button to turn the vent on

slow or off.

24. VENT 4 SPEED Touch button to change vent

speed.

25. VENT AUTO TIMESET Touch this button to set

ventilation time. (1, 3, 5, 10, and 30 minutes.)

-9-

5. Wiring Diagram / Key matrix

5-1. Wiring Diagram

VL VIOLET

ORANGE

YLPK

PK GY BL

RD WH

C. L.

21VAC

CAPACITOR

BNYL

180 60

356 140

WOL

HGIH

OBRUT

12345678

SLOW

12345678

H.V.FUSE

-10-

5-2. Key Matrix

KEY MATRIX

Turntable On/Off

Power LevelTime CookHold WarmC/T Lamp On/OffStart

MoreSensor Cook

time & weight

Defrost

N.AN.A

N.A

Sensor Popcorn

LessSensor ReheatTimer

987

Melt

654

321

SoftenQuick DefrostAdd 30 Sec.Energy SavingClockVent Hi/Low/OffClear

76543212st

KEY MATRIX

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