WHIRLPOOL ELECTRICAL APPLIANCES COMPANY LIMITED
SERVICE INFO MANUAL
MODEL: AVM562 SKU No.: 853856258291 DATE: October 7, 2005 REVISION: a
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
1. SPECIFICATION
Model AVM562
Outer dimension(H x W x D) 285x456x402mm Volume of cavity 17.8Liter
Basic function Microwave only cooking Grill only cooking
Control Electronic touch foil control
99-minute cook time
10-level microwave power level Programmable
Power supply 220V 60Hz, single phase
Output power Microwave: 800W
Grill: 1000W
Power consumption Max 1250W
Current consumption 8 A
Microwave frequency 2450 MHz
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.
1. Do not operate or allow the oven to be operated when the door is opened.
2. Perform the following safety checks on the oven to be serviced before activating the magnetron or other microwave sources and make repairs when necessary:
Interlock operation
Proper closing of door
Door bending
Seal and sealing surfaces (arcing, wear or other damages)
Damage to or loosening of hinges or latches
Evidence of dropping or abuse
Door window is intact
3. Before turning on the microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, waveguide or transmission line, and cavity for proper alignment, integrity, and connections.
4. Any defective or misadjusted components in the interlock, monitor switch, 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.
5. A microwave leakage check to verify compliance with the appropriate 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.
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.
4. SCHEMATIC DIAGRAM
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 setting the cook time and start 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
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 and immediately.
6. TROUBLE SHOOTING GUIDE 6.1 CAUTION AND IMPORTANT
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.
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 power relay, primary and secondary interlock switch.
7. HV diode break down.
Oven seems working, food is not cooked.
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. Defective control boards.
7. HV diode break 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).
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
IMPORTANT: The installation of the interlock and monitor switches is required by Federal regulations.
Oven door status
Primary switch Secondary switch
Monitor switch
Open Open Open Close
Close Close Close Open
1. The interlock and monitor switches positions are not service adjustable. To repair the door, remount the door and fasten the screws on the door hinges.
2. The monitor switch is provided to monitor the operation of the primary interlock switch. If the primary switch fails to operate when the door is open, the monitor switch will form a short circuit across the supply and the fuse in the oven will blow. Electric arc may form across the switch contacts of the primary interlock switch, the monitor switch. The switches may then be damaged. If the fuse is blown due to the failure of the primary interlock, repair the failed mechanical parts and replace all the interlock switches.
IMPORTANCE
After replacement of any part of the interlock and monitor circuit:
1. Check if the microswitches are OPEN and CLOSE by the latches as specified in the table above.
2. Check microwave leakage.
3. Check if the oven will turn off instantly when the door is pulled to the position where the door latches leave the interlock switches.
8. PART LIST & EXPLODED DIAGRAM
The following pages contain the service part list for this model.
Item no. Description Service parts no.
A01 Outer wrapping 4619-640-29951
A02 Back spacer 4619-641-38501
A03 Power cord assembly 4619-640-39771 A04 Distance plate 4619-644-12541 A05 Back insulator 4619-644-12531 A06 Top airguide 4619-644-12521 A07 Tube-connect-plate 4619-644-12592 A08 Front back support 4619-644-12485 A09 Oven foot expand nail 4619-641-41901
A10 Oven foot 4619-641-39202
A11 Tube support 4619-644-12552
A12 Mica sheet 4619-656-95351
A13 Water proof spacer 4619-656-95541 A14 Thermostat(165°C) 4619-648-77182 A15 Tubular rivet 4619-649-80251 A16 Quartz tube assembly 4619-648-77281 A17 Grill reflector 4619-644-12561 A18 Top insulator 4619-644-12511
Item no. Description Service part no.
B01 Magnetron 4619-648-33341
B02 Thermostat(145°C) 4619-648-56402
B03 HV diode 4619-646-97721
B04 Capacitor support 4619-644-12222
B05 HV capacitor 4619-646-51103
B06 Fan airguide 4619-641-89323
B07 Fan motor 4619-647-81511
B08 Fan wheel(five) 4619-641-89262
B09 Lamp holder 4619-648-77101
B10 Lamp(20W) 4619-648-77091
B11 Airguide 4619-641-88863
B12 Interlock assy 4619-640-39201
B15 Grill grid 4619-644-12601
B16 TT motor 4619-647-81772
B17 TT driver 4619-641-89371
B18 Glass tray 4619-656-95561
B19 Filter board assembly 4619-640-30311 B20 HV transformer 4619-648-77426
B21 Rubber 4619-640-31661
B22 Foam 4619-656-95811
B23 Double HV diode 4619-646-97821 B01
B02
B03
B04
B05
B06
B07 B08
B09
B10
B11
B12
B15 B16
B17 B18
B19
B20
B21 B22 B23
Item no. Description Service parts no.
C01 Door body assembly 4619-640-47431 C02 Inner glass
C03 Inner frame 4619-641-89341
C04 Extension spring 4619-644-11221
C05 Glass support 4619-641-89401
C06 Door hook 4619-641-91032
C07 Front door glass 4619-656-95371
C08 Door frame 4619-641-88852
Item no. Description Service parts no.
D01 Display lens 4619-641-54801
D02 Control board 4619-640-31051
D03 Control panel 4619-641-89351
D04 Membrane switch 4619-648-76782
Other information :
Item no. Description Language Service part no.
01 IFU English 4619-652-61025
Revision Log
Revision Description Revised by Revision Date
0 Original Revision Wang Wei Guo Sep 20, 2001
a Revising PN in the service part list Liang min yi October 7, 2005
