Whirlpool AVM 930 AV User manual

MICROWAVE OVEN AVM 930 AV
AVM 930 WH
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Service Man ual
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MW A1 -INTRODUCTION, SAFETY
MW 81 -TECHNICAl DATA
(\ MW C1 -INSTRUCTIONS FOR INSTAllATION
! MW D1 -WORKING PRINCIPlE, PART NOMENClATURE
MW E1 -OPERATING INSTRUCTIONS
MW F1 -DESCRIPTION AND FUNCTIONS OF COMPONENTS
1MW G1 -INSTRUCTIONS FOR DISMANTLlNG AND REPlACEMENT
..(' MW H1 -MEASUREMENTS AND ADJUSTMENTS
j MW 11 -RF lEAKAGE
..MW l 1 -COMPONENTS CHECK
.--\ MW N1 -WIRING DIAGRAMS -FUNCTIONAl DESCRIPTION
MW 01 -EXPlODED VIEW, PARTS LIST
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Printed in Italy -GL 0591 -Ed. 01

AVM 930 -MW A1
INTRODUCTION
Before leaving the factory each oven is carefully checked.
It must however, be installed and used correctly. '\
Oespite all the steps laken to make the oven safe, the safety is dependent on the correct installation and the fact the user ,I
understands how to use and maintain the oven.
The information in this section should be used as areminder that the oven is safe and that anyone who uses it must first ~
read the instructions tor use in order to be able to use the oven correctly and obtain the best results. )
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SAFETY ~1
To avoid injury to yourself and damage to the appliance always work to the following rules when servicing an oven.
.Always disconnect the plug tram the mains before starting work. !.
If there is no plug switch-off the electricity supply at the control box.
.When you have finished servicing an oven before you reconnect it to the mains, make sure that:
-all the internal connections are correct .,-
-the wires are insulated and not touching the door or the cabinet or anything sharp
-all the earth connections are electrically and mechanically sound c--,
-do not modify or anyway interfere with the safety devices built-in to the oven
-make sure that each replacement part you use conforms to the manufacturer's specifications
.00 not start arepair if you have any doubt as to your ability to complete it. ~
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Ed. 01 -May 91 )

AVM 930 -MW 81
TECHNICAL DATA
.Dimensions
Cabinet height .395 mm
width : 550 mm
depth : 570 mm
Cavity height : 240 mm
width .345 mm
depth .370 mm
.Weight Netweight : 33 kg
Grossweight .36 kg
.VersionsSupply voltage .220 V and 240 V :t10% -50 Hz
":"CCurrent consumption full power .approx. 13 A (UK version)
14 A (Continental version)
13 A (Swedish version)
..(' Current consumption Stand-by : 0.5 A
\. .Mains fuge (in the oven) .T 6.3 A (delayed) (Microwave part)
( .Power line fuge : 16 AT (Continental version)
13 A (UK version)
10 A (Swedish version)
.Power consumption : MW = 1300 W
Grill = 1900 W .
F.A. = 1700 W
.Magnetron : 2 M 240
Operating frequency .2450:t 25 MHz
Output power .700 W
600 W (Swedish version)
.Power levels .20-100%
.Thermostat : 50-250°C
.Timer : Electronic
( .Heater voltage : 3.3 V :t 10%
: .Anode voltage : approx. 4 kV d.c.
(.Cos <p : approx. 0.95
.. ( .Cooling .forced air, max inlet temperature 35°C
.Inrush current .approx. 35 A
.Current leakage to earth .approx. 0.6 mA
.Rectifier current .not possible to measure
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.Commercial type number .M930
r.Electrical connection 220 V : Cord and plug EU, 16 A with 2 kinds of earth connection
240 V .Cord and fused plug UK
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AVM 930 -MW C1
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INSTRUCTIONS FOR INSTAllATION ~
Place the microwave oven on a stable, level surface.
Da not place the appliance close to heat sources.
Ta allow good air circulation be sure thai the air inlet on top part of reff-hand side is not blocked. "I
The air outlet on the top of the oven and the top part of right-hand side shall have at least 5 cm air space to the sur-
roundings.
Take ca re to follow the same advice if the oven is to be hung on the wall by the wall hanging kilo )
INSTALLATION )
The oven is set tor the voltage indicated on the type plate situated on the back side of the oven.
Check thai the oven is connected to the correct vortage and properly earthed. ~
Use a correct fuse. See chapter "Technical data".
Measure the output power in accordance with the 1 litre of water method.
The measurement is explained in chapter "Measurements and adjustments". ,
Demonstrate the oven to the customer. Advise the customer of the servicing arrangements. ) .
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CAUTION -MICROWAVE RADIATION
PERSONNEl SHOUlD NOT BE EXPOSED TO THE MICROWAVE ENERGY WH ICH MAY RADIATE FROM THE ~
MAGNETRON, WAVEGUIDE OR ANTENNA IF THEY ARE IMPROPERl Y USED OR CONNECTED. ALL INPUT AND OUT-
PUT MICROWAVE CONNECTIONS, WAVEGUIDES, FLANGES AND GASKETS MUST BE SECURE.
NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING lOAD ATTACHED.
NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHllE THE DEVICE IS ENERGIZED.
NEVER OPERATE AN OVEN WITH CABINET OFF WITHOUT MEASURING THE MICROWAVE LEAKAGE AROUND ~
MAGNETRON AND VISIBLE MICROWAVE CONNECTIONS (WElDING JOINTS).
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Do not operate the oven if the following conditions exist:
-The door does not close firmly against the door support because of the door being warped or the hinges damaged.
-The door trims or seals are damaged.
-If there is any visible damage to the oven.
-If the door does not close properly.
Avoid operating the oven if known components in the interlock system, oven door or microwave generating assembly are
known defective. They must be replaced.
WARNING -HIGH VOLTAGE :
IT IS POSSIBlE TO GaME IN CONTACT WITH LETHAL HIGH Val TAGE WHEN WORKING WITH HVTRANSFORMER, HV
CAPACITOR, AND MAGNETRON.
THEREFORE NEVER TRY TO MEASURE THE HIGH VOLTAGE. ALWAYS TAKE UTMOST CARE WHEN PERFORMING "
ELECTRIC MEASUREMENTS INSIDE THE OVEN. (-'"'I ~
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AVM 930 -MW D1
MICROWAVE
FUNCTION
Microwave energy generated by the magnetron is
transmitted to the rotating anten na which reflects and
distributes the energy into the oven cavity für even
cooking results.
Fig.1/A
:r FORCED AIR
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Fig. 1/8
Fig.1/C
PART NOMENCLATURE
Air valve .
Cavity lamp 1120 Overheat protector
: Grill element 1180 F.A. unit 1160
( ODor
."-Bottom trayr Fan unit
Antenna Fan motor 1170
r Relay board1000
Mains filter 1030
rFunction selector1200 Magnetron 1010
Thermostat 1190 G
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: power contra' 1100 H.V. transformer
! 5000
Timer 1110 ODor switch
~ Operating Fig. 2
panel1 Ed. 01 -May 91
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AVM 930 -MW E1
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OPERATING INSTRUCTIONS ~
1. General :
The AVM 930 hag three heating sources:
-Microwave ~
-Forced air
-Grill
Microwave operation can be chosen in combination with
one of the above sources. )
2. Microwave only operation
-Put the function selector in off position n
-Set the desired microwave power
-Set the timer to the desired cooking time
-Press the start button ~
3. Forced air cooking
-Set the thermostat to the desired cooking temperature ~ ~ ~ ,
-Set the function selector to either FAfull speed or FA = ~. '1 .
half speed as required
-Set the timer to the desired cooking time or to f.
continuous mode unctlon \
-Press the start button selector $"
4. Grill cooking TUE ~
-Set the thermostat to the desired temperature, für grill ST's~ ~ r 1 1
this is mostly maximum 1/7, 1,-,-1 STAGE e:lectronic
-Set the function selector to grill or turbo-grill. Turbo- el IC'J!-::~J COOK tlmer
grill is grill + forced air without heating -+
-Set the timer to the desired cooking time or continuous 0stagke: ~
mode coo Ing
-Press the start button. digit set
microwave
5. Combinations power
Microwave cooking can be combined with either Forced .
air or Grill, but not all combinations at the same time. dautfowetIghteros
6. Opening the door
All cooking will be interrupted when the door is opened.
/(;'" start
7. Jet start ~ jet start
By pressing this button maximum the oven will start and stop
maximum microwave power will be on für 30 secs.
8. Stage cooking
A two-stage cooking program can be chosen by: thermostat
1) Press the stage cooking button.
2) Set the desired combination of microwave power and ,
time. -
3) Press the stage cooking button again. '"1""'" .". .,
4) Repeat step 2). ...",. ..I\\.l.4~,,&;
5) Press the start button. "
9. Auto weight defrost r\
By inputting the weight and foodclass automatic defrost
will start when pressing this button. ~
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AVM 930 -MW F1
DESCRIPTION AND FUNCTION OF COMPONENTS
Interference filter (1030)
Is intended to avoid interference with radio or TV Set during operation.
Cook led (1090)
This led indicates to the user when the oven is in the cooking cycle. When the cycle is finished the light goes off.
Fan motor (1070)
The fan motor drives a blower fan which draws cooling air through the ventilation opening on the right hand side forcing it
around the magnetron end transformer. Same air is also forced info the cavity to make the antenne rotate end to remove
steam end vapours given off by the cooking food, end then out through the ventilation openings situated on the lett hand
side.
.Cavity tamp (1120)"";:
r The cavity lamp illuminates the inferior of the cavity so the food can be seen through the door window. The cavity lamps
lights anytime cooking time is set.
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I. High voltage transformer (5000)
;- Purpose of HV transformer is to provide filament voltage tor heating the magnetron filament as weil as to produce high
voltage used tor magnetron tube operation.
During a "cook" cycle, the 220 V (240 V) ac applied to the primary winding is converted info approximately 3.3 V ac on
filament winding, and in to approximately 2300 V ac on the high voltage secondary winding of the power transformer.
Half wave voltage doubler circ~it (2000)
The halfwave voltage doublercircuit consists of a rectifier and a capacitorwith bleeding resistor. Purpose ofthis group is
to convert the 2300 V ac coming tram the secondary winding of high voltage transformer in to approximately 4000 Volts
d.c. needed tor magnetron operation.
Magnetron tube (1010)
Magnetron produces microwaves through the interaction of strang electric end magnetic fjelds. These microwaves are
guided into the oven cavity and evenly spread in the cavity by the rotating antenne producing the desired heat in the food.
Failure monitor switch (1150)
This is a normally open switch, which is clo$ed when the door is opened. Should then tor any reason the door switches
1055 or 1060 remain closed, the fuge 1002 will blow due to short-circuit. The short-circuit current is limited by resistor
3102.
Door switches (1040, 1140)
.These switches are safety switches operated by the door. The switch 1040 interrupts the current to the electronic control
.and display panel.
{ Switch 1040 is the primary door switch end 1140 the secondary door switch.
Note:
Defective switches should be destroyed to prevent possible future use.
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AVM 930 -MW G1
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INSTRUCTIONS FOR DISMANTlING AND REPLACEMENT 1:(\ ~
Warning high vortage ;!)~';C":'"
Before removing the outer Gase unplug the oven. J ::
High vortage parts are accessible when the outer Gase is removed. ,~
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FRONT PANEL REMOVAL r1
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TOP COVER AND SIDE PLATE REMOVAL
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AVM 930 -MW G2
CHANGINGCAVITYLAMP ~ t
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CHANGING THE GRILL ELEMENT
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AVM 930 -MW G3
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FAN UNIT REMOVAL i
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FORCED AIR UNIT REMOVAL ~
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Ed. 01 -May 91 )

AVM 930 -MW G4
CHANGINGTHE ANTENNA
1. Cutthrough the silicon glue with a
model knite
( 2. Gently use a screwdriver or something
\ similar to removethe bottom tray IL
3. Replace the antenna I
4. Putthe bottom tray back --
5. Seal the bottom tray by means ot silicon' ~
glue 4819 690 48045 ~
( 6. Allow 24 hrs. tor the glue to cure ~ --L-
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,\ REPLACINGTHE DOORINNERFRAME
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AVM 930 -MW G5
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DOOR REPLACEMENT )
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AVM 930 -MW H1
MEASUREMENTS AND ADJUSTMENTS
rFilament voltage check
r Caution: Approximately 2300 Vac are present at the high voltage terminals of the transformer during a cook cycle.
\. During test operation keep meter, hands etc., weIl away from high voltage terminals.
r .Disconnect the oven and discharge the capacitor with an insulated screwdriver.
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.Remove wires connecting the capacitor to the high voltage terminal on the transformer.
r.With alligator clips, connect the voltmeter across the magnetron filament terminals and stand weil away from the
meter and its leads.
.Apply power end put the oven into cook cycle, the meter should indicate approximately 3.3 Vac.
.C Caution: Switch off the oven before disconnecting the meter.
6,.r .If no voltage is indicated by the meter, set the meter on the proper range end check if220 V (240 V) ac are present at
, the primary winding of transformer during the "cook" cycle.
Ifthe input voltage is normal but no filament voltage is present replace HVtransformer.
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c, ( Anode voltage
Due to the presence of the high voltage (approx. 4 KV) it is not tor satety reasons allowed nor necessary to measure
, anode voltage, normally a continuity test of transformer windings and a capacitor check as described in components
r checks section are sufficient to determinate if anode voltage is correct or not.
r .
Measuring the output power
~The temperature of one litre of water will rise 14,3°C per minute, ifthe
output power of the oven is 1 kW.
For measuring the output power, proceed as foliows:
.Check that the oven end the bottom tray are clean.
.PlaGe one thin walled glass beaker with a diameter of approx. 10
Gm.filled with one litre ofwater, in the centre ofthe oven cavity after 1 It. ".0
( having measured the temperature of the water.
..Start the oven at max. tor one minute, checked by the watch (start -
i" measuring time when hum tram transformer starts).
( .Measure the average temperature increase, i.e.temperature after 1
minute minus temperature at the beginning..'
r .Divide the results by 14.3, the value gives the power in kW.
.The output power of the oven should be higher than 700 W -20%
(= 560 W) tor the lifetime of the oven.
r- Repeat this measurement a few times. Fig.13
.Note: tor the Swedish version the nominal output power is 600 W.
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" .Note: This test is only meant as an indication and will not be accu-
rate to give an exact output power.
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AVM 930 -MW 11
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R.F. LEAKAGE ~
Important
An R.F. leakage check should be performed before and after every repair or adjustment. \
To perform the R.F. leakage check proceed as foliows:
-Fill a glass beaker with 275 milliliters of tap water and plaGe it in the centre of the cavity. (j
-Adjust the R.F. meter according to operational instructions. -
-Start the oven on Juli power, set the timer to at least 3 minutes. ~
-Check the oven by moving the probe not taster than live centimeters per second, starting atthe right hand top side of
the door, clockwise, back to the starting position. Also acheck over the entire visual screen must be made.
Readings have to be always below 5 mW/cm2. n
Note: For a proper leakage test, position the oven so that is possible to run the probe under and perpendicular to bottom
edge 0' the door. ~"'
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Important !
Ifthe reading is over 5 mW/cm2 the oven and the door should be checked tor damages and the door alignment to the
cavity should be checked. Make sure that the door is closing properly. )
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'. AVM 930 -MW L1
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COMPONENTS CHECK
Magnetron check DOME
(" .Filament test
, Disconnect the oven tram the mains. Discharge the HV
capacitor. Disconnect the high voltage wires tram the
( magnetron filament terminals.
, Measure the resistance across the two magnetron filament
terminals.
Correct reading is less than 1 Q.
(Ifhigh resistance or infinite resistance is found, replace the It
" magnetron.
( .Shorted magnetron test "
.Connect ohmmeter between magnetron filament terminals
1"' (and chassis, the reading on the meter should be infinite, if
f -there is low resistance the magnetron is grounded and must
, be replaced.
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'. Note: When replacing the magnetron:,
( Fig. 14!
~- -Do not reverse wires connected to magnetron terminals.,!
2(-Do not operate the oven with the R.F.gasket missing or damaged, the R.F.gasket is located around the dome ot the
" magnetron tube to prevent any leakage ot energy trom it.t
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~(Caution: When replacing the magnetron care hag to be laken to avoid the dome being scratched by any metallic parts.I
'- Small particles of any metal in the ceramic dome will greatly reduce the life of the magnetron.
t r Capacitor and diode check
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~r( Capacitor check
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~ '. An open circuit capacitor will result in no high voltage to the(
magnetron.I
A shorted capacitor normally causes high mains current C
blowing the line fuge.
An ohmmeter can be used to check tor a shorted or open r 1
( capacitor. I I
.Unplug the oven. Discharge the capacitor. Remove wires I I,,' tram capacitor I
r .With an ohmmeter set on the highest scale, measure the I I
resistance across terminals "C" and the other terminal. j I
.' The meter needle should momentarily deflect upward to I I
~ indicate continuity and should then return to infinity once I I
( the capacitor is charged. Reversing the meter leads Ishould give the same indication. I
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.If the ohmmeter indicates continuity between the
( capacitor terminals at all the times, or if no meter ";'
deflection occours atall, the capacitor should be repla-
ced. Fig. 15
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AVM 930 -MW L2 l)
Diode check
The high voltage diode is built-in in the same case as the HVcapacitor. 'I
Unplug the oven, discharge the capacitor and remove wires tram it.
With an ohmmeter set on the highest scale, measure the resistance across terminal "C" and capacitor case.
Reverse the meter leads and again observe the resistance reading. Anormal diode should read infinite resistance in one ~
direction and approximately 50 KQ or less when the meter leads are reversed.
Note: Meters opera ted with less than 6Vbattery are not adequate tor these checks. Themeter should be first checked with I)
a diode known to be good before judging a diode to be defective.
Safety switches check ~
Disconnect the oven, remove wire from terminal 1 of the switch, connect an ohmmeter to the terminals 1 and 4. With
closed dOOf reading should be short circuit, with open door reading must be infinite. n
If reading is short circuit or infinite all the time, the switch must be replaced. ~1
Note: If a safety switch is replaced make sure it is activated when ~ ~ n ~
the door is closed. ~ I ' 4
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Failure monitor switch check Fig. 16 !
Disconnect the oven, remove one wire tram the switch, connect an ohmmeter to the terminals of the switch. With open
door reading has to be short circuit, with closed door reading has to be infinite. 1
If reading is short circuit or infinite all the time switch must be replaced.
Note: When replacing the failure monitor switch make sure the switch is activated when the door is open. ~
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AVM 930 -MW N2
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1. CIRCUIT DESCRIPTION ~ ,
2.1. Supply voltages ~
2.1.1. Supply Voltage tor the Electronic Circuitry i
The winding between terminals 14and 15 otthe transtormer provide a nominal voltage ot35.2 VAG.This voltage is recti-
tied in the bridge consisting ot the diodes 6131 -6134 and smoothed by the capacitor 2132. Q
The 50 Hz reterence tor real time Glück and tri ac sync. is also laken tram this winding via the diode 6135. The signal is til-
tered by resistor 3131 and the capacitor 2133. ~
2.1.2 Filament Supply Voltage
The winding between terminals 12 and 13provide the filament with a nominal voltage ot 2.5 VAC. This voltage is clamped
to U2 through the transistors 7122 and 7123. The transistors are alternately saturated synchronously with the AC-vol- Q
tage, and are supplied with base current via the FTD.
The transistor 7121 supplies the FTDwith a stabilized voltage ot ca -29 Vwith reterence to U1, and 7109 does the same ~ .
tor the LED bar. The transistors are provided with a stabilized voltage ot -30 V tram the zenerdiode 6121. ~ )Ii
2.1.3 Opto Isolator Supply Voltage ~\ .
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The optocoupler circuitry is supplied tram the winding 1 -2 otthe transtormer. The voltage is halt-wave rectitied in ß019 ---'
and smoothed by 2109. I
2.2 Relay-drivers
The relays 1141 and 1142 are driven with constant currents tram the current generators 7141 and 7142. The current ~l
through each relay is approx. 24 mA. The transistors are protected tram surge voltages by the diodes 6141 -6144.
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2.3 Opto Isolator and Triac Circuitry
Turning on otthe triac is synchronized by the microcomputer. The optocoupler is connected in series with the LED bar on
the control board assembly, where a current generator drives a constant current through the LED-array.
The current through 7108 is normally shunted by the transistor 7167, in which case the optocoupler is turned off. When
7167 is turned off, the current passes through the optocoupler-LED, and current passes through the transistor in the
optocoupler. This in turn saturates the transistor 7106, and the triac is turned on. '\I
The triac is protected tram surge voltages by the VDR-resistor 3104 and the resistor/capacitor circuit 2103/3103. !
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'... AVM 930 -MW N3
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AVM 930 -MW N4
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CONTROL BOARD "--',
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