Whirlpool Europe
Custom er Services
S E R V I C E
AVM 512
Service Manual
Microwave oven
AVM 512
Model
Version
AVM 512
8538 512 62291
Introduction safety
Technical data
Text/Legend
Page
2
3
4 - 8
9
Spare part list
Exploded view
Wiring diagram
10
11
This documentation is only intended for qualified technicians who are aware of the respec-
tive safety regulations.
Date: 11.11.1998
Subject to modification
Document-No.: 4812 714 12457
Download from Www.Somanuals.com. All Manuals Search And Download.
Whirlpool Europe
Custom er Service
AVM 512
8538 512 62291
11.11.1998 / Page 3
Doc. No: 4812 714 12457
S E R V I C E
Technical data
Electrical
Voltage
Frequency
Power consumption
230
50
1350
V
Hz
W
Power
Output power
850
W
Microwave frequency
2450
MHz
Tim er
Electronic
99 min. 99 sec.
10-level microwave power level
4-stage programmed cooking
Download from Www.Somanuals.com. All Manuals Search And Download.
11.11.1998 / Page 4
Doc. No: 4812 714 12457
AVM 512
8538 512 62291
Whirlpool Europe
Custom er Service
S E R V I C E
Text/ Legend
INSTALLATION REQUIREMENTS
GENERAL
The oven should be placed on a flat and stable surface
Place the oven away from high temperature and steam sources.
Clearance of at least 5cm (2”) on each side must be provided to allow adequate ventilation.
The microwave oven must be plugged directly to a 3-prong wall receptacle which is properly grounded.
The power source must be 220V 50Hz 8A single phase.
GROUNDING INSTRUCTIONS
IMPORTANT:
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:
Ground path resistance:
0.5 mA max.
0.1 ohm max.
OPERATIONAL DESCRIPTION
The following describe the basic operation of the appliance. Please refer to the schematic diagram when
reading:
Food is placed inside the oven and the door is closed. “Start” button is not pressed:
Primary and secondary interlock switches are closed. Monitor switch is open. Door switch is closed. Relay 1
and relay 2 are both open.
When the tim er is set for a certain cooking tim e, cook power is set and the “Start” button pressed:
Relay 1 is closed. AC power is supplied to the cavity lamp, fan motor and turntable motor. Depending on the
power level setting, AC power is supplied to the HV transformer through relay 2 with the duty cycle
corresponding to the power level setting. The display timer will start to count down.
When the tim er counts to Zero:
Relay 1 and relay 2 will be and all AC power to the motor, lamp and HV transformer will be cut. The control
board buzzer will give a “beep” sound to give an OFF signal.
When the door is open during cooking:
Primary and secondary interlock switch are opened. Door switch is opened. The monitor switch is closed. All
AC power will be cut.
Pure m icrowave cooking:
10 power level settings are available for pure microwave cooking. This can be adjusted using the power switch
on the touch foil. Power level control is achieved by switching the magnetron ON and OFF periodically. The
oven works on 15 second cycle and the following indicate the correct ON/OFF timing.
Download from Www.Somanuals.com. All Manuals Search And Download.
Whirlpool Europe
Custom er Service
AVM 512
8538 512 62291
11.11.1998 / Page 5
Doc. No: 4812 714 12457
S E R V I C E
Power setting
ON tim e
10(highest)
100%
9
approx 93%
8
approx 87%
approx 80%
approx 67%
approx 60%
approx 53%
approx 40%
approx 33%
approx 27%
7
6
5
4
3
2
1 (lowest)
MICROWAVE AND LEAKAGE TESTS
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 and necessary.
Prepare a glass beaker with a diameter of approx. 190 mm round. with a max. 3 mm wall thickness.
Fill the beaker with exact 1 liter of cold water with an temperature of 10-12 ˚C measure the temperature
of the water before placing into the oven.
Start the oven for 1 min. on full power (only microwave) check the time by your writwatch after the
magnetron takes full power (Ampere meter).
The unit should be heated up 2-3 times before the test starts.
Check the water temperature under stirring the water and calculate the difference to the start temperature.
˚C x 70(multiplicator)=watt
Please take under consideration that always the measured power output is 15-20% lower than the rating plate
shows. 850 W = 720-680 W if the measured output is below this rate please repeat the measurement.
LEAKAGE TEST
TESTING EQUIPMENT
0.5l beaker.
Microwave tester of high quality.
Download from Www.Somanuals.com. All Manuals Search And Download.
11.11.1998 / Page 6
Doc. No: 4812 714 12457
AVM 512
8538 512 62291
Whirlpool Europe
Custom er Service
S E R V I C E
TESTING PROCEDURE
Place 0.25l of water into the beaker and place it in the center of the oven.
Turn on the microwave oven by setting the unit on full power.
Hold the probe of the microwave tester to the surface of the oven and scan it at the rate of 2.5 cm per sec.
Test the following areas for microwave leakage:
- round and across the door glass and control panel.
- all ventilation openings.
2
The leakage should never exceed 5 mW/cm .
Record all data.
OVEN LEAKAGE REPAIR
2
If leakage figure is found above 5 mW/cm .
The unit has to be set out of function, until the unit is repaired and finally saefty tested.
Service engineer should notify the Service Managem ent im m ediately.
TROUBLE SHOOTING GUIDE
CAUTION AND IMPORTANT
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.
When disassembling, service personnel should remove their watches and metal chains from their hands.
Never touch the high voltage components and wire.
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.
Do not measure high voltage with a common voltmeter.
Download from Www.Somanuals.com. All Manuals Search And Download.
Whirlpool Europe
Custom er Service
AVM 512
8538 512 62291
11.11.1998 / Page 7
Doc. No: 4812 714 12457
S E R V I C E
QUICK SERVICE REFERENCES
PROBLEM
POINTS TO CHECK
Cavity lamp does not light, but
other electrical components
(e.g. turntable) are working.
Lamp burnt.
Bad contact between lamp and lamp socket.
Cavity lamp does not light, all
other electrical components
also do not work.
Power plug not in good connection with the socket.
No power supply.
Fuse blown.
Bad contact between fuse and fuse holder/clip.
Loose door hinge, door poorly adjusted, interlock poorly
adjusted; causing fuse to be blown.
Short circuit within electrical circuit.Lamp filament short,
HV transformer short, all causing fuse blown.
Bad contact in contacts or terminals of timer switch,
primary and secondary interlock switch.
HV diode break down.
Oven seems working, food
does not cook
Defective magnetron (filament broken, filament short to
ground etc.).
Ground wire of HV transformer broken.
Filament wire short to ground.
Filament wire broken.
Bad contact in magnetron terminals.
Defective control boards.
HV diode break down, giving a hum noise.
Oven cooks for a short while
and stop.
Cooling fan jammed.
Cooling fan motor open circuit.
Defective cooling fan control relay.
Turntable does not turn.
Defective turntable motor.
Turntable shaft deformed.
User circuit breaker activates.
High leakage in electrical components (mostly motor).
MAJ OR COMPONENT TESTS
HV TRANSFORMER
Remove lead wire.
Measure the resistance of the winding using an ohm meter
Primary winding 3 ohm (approx.)
Secondary winding 100 ohm (approx.)
Filament winding 0 ohm (approx.)
HV CAPACITOR
Remove lead wire
Measure the resistance using an ohm meter set to R*1000
Terminal to terminal should momentary indicates several ohms but gradually increases to infinite.
Terminal to case should show infinite.
Download from Www.Somanuals.com. All Manuals Search And Download.
11.11.1998 / Page 8
Doc. No: 4812 714 12457
AVM 512
8538 512 62291
Whirlpool Europe
Custom er Service
S E R V I C E
HV DIODE
Remove lead wire.
Measure forward resistance, normal diode show continuity.
Measure reverse resistance, normal diode show infinite resistance.
MAGNETRON
Remove lead wire.
Install the magnetron gasket in the correct position. Check that the gasket is in good condition.
Measure the resistance of the filament terminals. Normal magnetron should be less than 1 ohm.
Measure the resistance between the filament terminal to chassis. Normal magnetron should be infinite.
INTERLOCK SWITCH SYSTEM
IMPORTANT: The installation of the interlock and m onitor sw itches is required by Federal regulations.
Oven door
status
Prim ary
sw itch
Secondary
sw itch
Monitor
sw itch
Open
Close
Open
Close
Open
Close
Close
Open
The interlock and monitor switches positions are not service adjustable. If the screws on the hinges of the
oven door are loosen, the door may not be in a correct position. In this case, the interlock switches cannot be
operated by the latch pins of the door when the door is shut. To repair the door, remount the door and fasten
the screws on the door hinges.
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 secondary switch and 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.
IMPORTANT
After replacement of any part of the interlock and monitor circuit:
Check if the microswitches are turned ON and OFF by the latches as specified in the table above.
Apply sealant to the screws and nuts of the door hinges.
Check microwave leakage.
Check if the oven will turn off instantly when the door button is pushed to the position where the door latches
leave the interlock switches.
Download from Www.Somanuals.com. All Manuals Search And Download.
Whirlpool Europe
Custom er Service
AVM512
8538 512 62291
11.11.1998 / Page 9
Doc. No: 4812 714 12457
S E R V I C E
Spare part list
Model
AVM 512
Service No.
Version
853851262291
853851262291
Pos. No. 12NC Code
Description
from
to
002 0
002 2
002 3
002 4
011 0
4819 902 00561 Lid
4819 902 00568 Plate
4819 902 00571 Pin
4819 902 00569 Bushing
4819 902 00694 Foot
011 1
040 0
040 1
121 0
121 1
4819 902 00566 Cap
4819 902 00445 Hinge,upper
4819 902 00444 Hinge,lower
4819 902 00326 Door,inner
4819 902 00599 Door frame inner
130 0
130 9
131 0
131 1
131 2
4819 902 00579 Holder
4819 902 00597 Hook connector
4819 902 00596 Lockingmechn. upper
4819 902 00595 Lockingmechn. lower
4819 902 00594 Pivot door pin
141 0
142 0
143 0
255 0
264 0
4819 902 00484 Oven glass outer
4819 450 58454 Glass inner (PE plate)
4819 459 48923 Door frame
4819 902 00654 Turntable glass
4819 902 00529 Ring turn table
264 1
264 2
320 0
321 0
332 0
4819 902 00582 Wheel
4819 902 00528 Shaft
4819 902 00683 Control panel
4819 902 00644 Display glass
4819 902 00557 Button door
404 0
406 0
406 3
412 0
420 0
4819 902 00614 Magnetron
4819 902 00695 Motor turn table
4819 902 00567 Gasket
4819 902 00556 Transformer HV
4819 902 00583 Capacitor HV 0.95UF
421 0
426 0
426 1
440 0
443 0
4819 902 00679 Filter
4819 218 38038 Diode HV
4819 902 00574 Diode double way
4819 902 00696 Propeller,motor
4819 902 00592 Fan wheel
443 1
490 0
490 4
490 5
490 6
4819 902 00591 Support fan
4819 902 00298 Cable,mains SAA Plug
4819 902 00563 Clip wire sadle
4819 902 00604 Strain relief
4819 404 79411 Bracket for cable
500 0
561 0
562 0
620 0
632 0
4819 214 78684 Control unit
4819 902 00586 Thermostat magnetron
4819 902 00636 Thermostat
4819 902 00682 Switch plate
4819 902 00609 Switch security
632 1
633 0
651 0
743 0
900 5
4819 902 00447 Lever
4819 902 00611 Switch
4819 134 28051 Lamp
4819 902 00575 Air guide
4819 902 00585 Holder filter board
904 0
910 9
930 0
930 1
930 3
4819 902 00589 Sleeve
4819 902 00565 Pin
4819 902 00581 Spring,tension
4819 902 00598 Spring
4819 902 00601 Spring,compres.
Download from Www.Somanuals.com. All Manuals Search And Download.
11.11.1998 / Page 10
Doc. No: 4812 714 12457
AVM 512
8538 512 62291
Whirlpool Europe
Custom er Service
S E R V I C E
Exploded view
Download from Www.Somanuals.com. All Manuals Search And Download.
Whirlpool Europe
Custom er Service
AVM 512
8538 512 62291
11.11.1998 / Page 11
Doc. No: 4812 714 12457
S E R V I C E
Wiring diagram
Download from Www.Somanuals.com. All Manuals Search And Download.
|