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36
11-1 ElectricalMalfunction(continved)
part Cause Diagnosis Remedy
Microwave
turnsoffduring
cook-ingcycle.
1)Toosmall
aload
Ifasmallamountoffoodisheatedforalongtime,
periodofmicrowavemayturnoffduringoperation.
Toincreasetheoven
waterintowaterinto
theoven.
2)Defective
magnetron
thermal
cutoutS/W
Checktoseeifthemagnetronthermalcutoutswitch
isactivatedatatemperaturehigherthan150 .
Replacethermalcutout
switch.
properly
shockis
felt.
Incomplete
grounding
Makesurethatqroundingofthepowersupplycord
hasbeendoneproperly.
Rewire.
Doordoenot
operate
properly
1)Brokendoor
hinges
Removethecabinetforinspection.Checkthedoor
hinge.
Replacedoorhinges.
2)Missingor
loosescrew
Checkifthescrewsaresecuredwelltothedoor
hinge.
Fastenortighten.
Timerdoes
notoperate.
1)Defective
timermotor
Ifthetimerdoesnotoperatewith21Vappliedto
theterminals,thetimermotoramybefaulty.
Replacetimer.
2)Defective
contactsof
timerS/W
Thelampdoesnotlight. Replacetimer
Cookingtray
doesnot
rotate.
1)Defective
drivemotor
Checktoseeif21Vexistsatthemotorterminals.If
so,motorwillbedefective.
Replacedrivemotor.
1)Blockingof
theventilatior
Checkiftheairinletoroutletventilationisblocked
bythewallorotherobjects.
Keepadistanceof
100mmfromthewallor
theobjects.
Magnetron
thermal
cutout
switch
OFF
2)Defectivefan
motor
Ifthefanmotordoesnotoperatewith230Vapplied
totheterminal,themotormaybefaulty.
Replacefanmotor.
3)Toosmalla
loadorno
load
Ifasmallamountoffoodisheatedrepeatedlyover
alongperiodoftime,microwaveturnsoffduring
operation.
Toincreasetheoven
load,placeaglassof
waterintotheoven.
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