Whirlpool AVM541 Manuale utente

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 1 OF 17

WHIRLPOOL ELECTRICAL APPLIANCES

COMPANY LIMITED

SERVICE INFO MANUAL

MODEL: AVM541

SKU No.: 853854158291

DATE: October 6, 2005

REVISION: a

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 2 OF 17

CONTENTS

1. SPECIFICATIONS

2. SAFETY PRECAUTIONS

3. INSTALLATION REQUIREMENTS

3.1 GENERAL

3.2 GROUNDING INSTRUCTIONS

4. SCHEMATIC DIAGRAM

5. MICROWAVE AND MICROWAVE LEAKAGE TEST

5.1 MICROWAVE TEST

5.2 MICROWAVE LEAKAGE TEST

6. TROUBLE SHOOTING GUIDE

6.1 CAUTION AND IMPORTANCE

6.2 MICROWAVE LEAKAGE

6.3 QUICK REFERENCE

7. MAJOR COMPONENT TESTS

7.1 HV TRANSFORMER

7.2 HV CAPACITOR

7.3 HV DIODE

7.4 MAGNETRON

7.5 INTERLOCK SWITCH SYSTEM

8. PART LIST & EXPLODED DIAGRAM

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 3 OF 17

1. SPECIFICATION

Model

AVM541

Outer dimension(H x W x D)

285x456x392mm

Volume of cavity

17.8Liter

Basic function

Microwave only cooking

Control

Mechanical timer control

60-minute timer

5-level microwave power level

Power supply

220V, 60 Hz, single phase

Output power

Microwave: 800W

Power consumption

Max 1250W

Current consumption

8 A

Microwave frequency

2450 MHz

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 4 OF 17

2. SAFETY PRECAUTIONS

This manual is intended for use by personnel with adequate background in

electrical, electronic and mechanical engineering. Any improper attempt to repair

this oven may result in personal injury and property damage. The manufacturer or

seller cannot be hold responsible for the interpretation of this manual nor can they

assume any liability in connection with its use.

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 when the door is opened.

b. Make the following safety checks on all ovens to be serviced before

activating the magnetron or other microwave sources, and make repairs

when 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 the 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

connection.

d. Any defective or misadjusted components in the interlock, monitor, door

seal, and microwave generation and transmission system 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.

TO PREVENT ELECTRICAL SHOCK, PAY EXTREME CAUTION WHEN

DIAGNOSING OVEN WITH OUTER CASE REMOVED AND POWER

TURNED “ON”. THE HIGH VOLTAGE SECTION OF THE POWER

SUPPLY, INCLUDING FILAMENT LEADS, ARE AT A HIGH TENSION

OF -4000 VOLTS. ALSO, ENSURE THAT THE HIGH VOLTAGE

CAPACITOR IS DISCHARGED.

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 5 OF 17

3. INSTALLATION REQUIREMENTS

3.1 GENERAL

1. The oven should be placed on a flat and stable surface

2. Place the oven away from high temperature and steam sources.

3. Clearance of at least 5cm (2”) on each side must be provided to allow adequate

ventilation.

4. The microwave oven must be plugged directly to a 3-prong wall receptacle

which is properly grounded.

5. The power source must be 230V 50Hz 8A single phase.

3.2 GROUNDING INSTRUCTIONS

IMPORTANCE:

DISCONNECT POWER BEFORE SERVICING, RECONNECT ALL

GROUNDING DEVICES.

All mechanical parts of this appliance capable of conducting electricity are

grounded. In the event of an electrical short circuit, grounding reduces the risk of

electric shock. This appliance is equipped with a cord having a grounding wire

with a ground plug. The plug must be plugged into an outlet that is properly

installed and grounded.

WARNING:

IMPROPER USE OF THE GROUNDING PLUG MAY RESULT IN

ELECTRICAL SHOCK.

If grounding wires, screws, straps, clips, nuts or washers used to complete a path to

ground are removed for service, they must be returned to their original positions

and properly fastened.

GROUNDING SPECIFICATION:

Leakage current: 0.75mA max.

Ground path resistance: 0.1ohm max.

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 6 OF 17

4. SCHEMATIC DIAGRAM

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 7 OF 17

5. MICROWAVE AND MICROWAVE LEAKAGE TESTS

5.1 MICROWAVE TEST

The following is a simple test to check if the appliance is generating microwave

energy. This test is not intended to be an accurate test. An accurate measurement

of output power must be performed under strict control following the IEC standard.

In field service, accurate measurement of output power is usually not required.

1. Prepare a beaker of water of quantity about 1000cc.

2. Measure the temperature of the water before putting into the oven.

3. Heat the water in the oven with full power (microwave only) for 60 seconds.

4. Again measure the temperature of the water.

5. If the temperature rise by about 10 degree Centigrade, then the microwave

generating system is working.

5.2 MICROWAVE LEAKAGE TEST

5.2.1 TESTING EQUIPMENT

600cc beaker

Microwave meter

5.2.2 TESTING PROCEDURE

1. Place 275cc of water into the beaker and place it in the center of the oven.

2. Turn on the microwave oven by turning the timer ON at full power.

3. Hold the probe of the microwave meter perpendicular to the surface of the oven and

scan it at the rate of 1 inch/sec.

4. Test the following areas for microwave leakage:

Door and control panel

All ventilation openings

All lockseams

Weld at bottom

Bottom plate

Oven foot

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 8 OF 17

5. Pull the door to the position at which the oven is just about to turn off due to the

interlock switch action, scan the door perimeter for microwave leakage.

6. Maximum allowable leakage is 4 mW/cm2.

7. Record all data.

5.2.3 OVEN MICROWAVE LEAKAGE REPAIR

If leakage figure is found to be above 5 mW/cm2, owner should be told not to use

the oven until it has been serviced. Service personnel should notify the

manufacturer immediately.

5.2.4 OPEN DOOR TEST

With the oven in operation state, open the oven door and check if the oven is still

operating. If so, the service personnel should tell the owner not to operate the oven

again and should notify the manufacturer immediately.

6. TROUBLE SHOOTING GUIDE

6.1 CAUTION AND IMPORTANCE

1. Before disassembling the oven, the oven power must be turned off. Remove the power

plug of the oven from the outlet and wait for at least 3 minutes.

2. When disassembling, service personnel should remove their watches and metal chains

from their hands. Never touch the high voltage components and wire.

3. Before checking or replacing, discharge the high voltage capacitor to oven chassis

grounded with an insulated wire. Make sure that the wire is grounded to chassis side

before short circuiting the capacitor terminal.

4. Do not measure high voltage with a common voltmeter.

6.2 MICROWAVE LEAKAGE

1. Refer to section 5.2 regarding microwave leakage. If the leakage is greater than 4

mW/cm2, it is necessary to repair the oven.

2. If leakage is found worst at control panel, ventilation openings or oven bottom, check if

there is any damaged parts or loose screws in the respective areas. If so, replace the

damaged parts and fasten the screws.

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 9 OF 17

3. If leakage is found worst around the door perimeter, adjust the interlock support or

change the door.

6.3 QUICK SERVICE REFERENCES

PROBLEM

POINTS TO CHECK

Cavity lamp does not light, but other

electrical components (e.g. turntable) are

working.

1. Lamp burnt.

2. Bad contact between lamp and lamp

socket.

Cavity lamp does not light, all other

electrical components also do not work.

1. Power plug not in good connection with

the socket. No power supply.

2. Fuse blown.

3. Bad contact between fuse and fuse

holder/clip.

4. Loose door hinge, door poorly adjusted,

interlock poorly adjusted; causing fuse

to be blown.

5. Short circuit within electrical circuit.

Lamp filament short, HV transformer

short, all causing fuse blown.

6. Bad contact in contacts or terminals of

timer switch, primary and secondary

interlock switch.

7. HV diode break down.

Oven seems working, food does not cook

1. Defective magnetron (filament broken,

filament short to ground etc.).

2. Ground wire of HV transformer broken.

3. Filament wire short to ground.

4. Filament wire broken.

5. Bad contact in magnetron terminals.

6. HV diode breaks down, giving a hum

noise.

Oven cooks for a short while and stop.

1. Cooling fan jammed.

2. Cooling fan motor open circuit.

Turntable does not turn.

1. Defective turntable motor.

2. Turntable shaft deformed.

User circuit breaker activates.

1. High leakage in electrical components

(mostly motor).

WHIRLPOOL ELECTRICAL APPLIANCES CO. LTD. SERVICE MANUAL

Ref: 54158291a PAGE 10 OF 17

7. MAJOR COMPONENT TESTS

7.1 HV TRANSFORMER

1. Remove lead wire.

2. Measure the resistance of the winding using an ohm meter

3. Primary winding 3 ohm (approx.)

4. Secondary winding 100 ohm (approx.)

5. Filament winding 0 ohm (approx.)

7.2 HV CAPACITOR

1. Remove lead wire

2. Measure the resistance using an ohm meter set to R*1000

3. Terminal to terminal should momentary indicates several ohms but gradually

increases to infinite.

4. Terminal to case should show infinite.

7.3 HV DIODE

1. Remove lead wire.

2. Measure forward resistance, normal diode show continuity.

3. Measure reverse resistance, normal diode show infinite resistance.

7.4 MAGNETRON

1. Remove lead wire.

2. Install the magnetron gasket in the correct position. Check that the gasket is in

good condition.

3. Measure the resistance of the filament terminals. Normal magnetron should be

less than 1 ohm.

4. Measure the resistance between the filament terminal to chassis. Normal

magnetron should be infinite.

7.5 INTERLOCK SWITCH SYSTEM

IMPORTANCE: The installation of the interlock and monitor switches are

required by Federal regulations.

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