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37
11-2 UnsatisfactoryCooking
11-3 PartCheckList
Parts Cause Diagnosis Remedy
Foodis
notheated.
1)Opencathodeof
magnetron
Checktheterminalswithamultimetertosee
iftheheatercircuitisopen.
Replacemagnetron.
2)Defective
H.V.Diode
ChecktheH.V.Diodeforcontinuityinthereverseand
normaldirectionsusingmeter.Ifthereiscontinuity
inthereversedirection,theH.V.Diodemaybefaulty.
(InthiseventH.V.Capacitorwillbehot)
ReplaceH.V.Diode.
3)Shorted
magnetron
Connectmeggerleadstoquick-connectterminal&
bodyofthemagnetronifthereiscontinuity,the
magnetronmaybefusewillbeblown)faulty.(Inthis
casethemainfusewillbeblown)
Replacemagnetron.
4)Defective
magnetron
Ifthereisacrackinthemagnetronantenna(dome),
themagnetronisdefective.
Replacemagnetron.
5)Poorcontactof
primaryinterlock
switch
Checkifthescrewsaresecuredwelltothedoorhinge.
andpressingitONandOFFrepeatedly.
Replaceoradjust.
6)Opencoilof
H.V.Trans-
former
Checkthecontinuityofprimarycoilandsecondary
coil.Ifthereisnocontinuity,H.V.Transformeris
defective.
Replacethe
H.V.Transformer.
7)ShortedH.V.
capacitor
Checkthecontinuityofcapacitor.
Ifthecapacitorshorts,thefuseblows
Replacethe
H.V.Capacitor.
8)Monitorfuse
blownout
Checkthemonitorfuse(onthenoisefilter)
Replacethe
Monitorfuse
Symptom RelatedParts CheckPoints Remedy
Microwave
cookingdoes
notwork.
H.V.Transformer
1)Checkiftheprimaryandsecondarycoilisopenorshorted.
*Resistanceofprimarycoil:.1.94 Approx
Resistanceofsecondarycoil:Approx.139
2)CheckiftheMGTHeaterVoltageisapprox.3.3VAC.
Caution:Highvoltage!
Replace.
H.V.Capacitor
Checkcontinuityofcapacitorbetweentwo
terminalswithH.V.wireleadremoved.
Theresistanceshouldbeapprox.10M
Ω
,it'sfailure..
Replace.
H.V.Diode
1)Ifthereisnocontinuityinforward,directiontheH.V.Diodeisopen.
2)Ifthereiscontinuityinreversedirection,it'sshorted.
Replace.
Fanmotor
doesnot
rotate.
Fanmotor Checkifthemotorcoilisopen. Replace.
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