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39
12-1 ElectricalMaltunction(continved)
SYMPTOM CAUSE CORRECTIONS
Ovenlampandfanmotorturnon 1.Misadjustmentorloosewiring
ofprimarylatchswitch
2.Defectiveprimarylatchswitch
Adjustdoorandlatchswitches.
Ovencanprogrambuttimer
doesnotstart.
1.Openorloosewiringof
secondaryinterlockswitch
2.Off-alignmentofprimary
interlock
3.
DefectivesecondaryinterlockS/W
Adjustdoorandinterlockswitches.
Microwaveoutputislow;.
Oventakeslongertimeto
cookfood.
1.Decreaseinpowersource
voltage.
2.Openorloosewiringof
magnetronfilamentcircuit.
(Intermittentoscillation))
3.Agingofmagnetron
Consultelectrician.
Fanmotorturnsonwhenpluggedin Loosewiringofdoorsensingswitch Checkwireofdoorsensingswitch.
Ovendoesnotoperateandreturnto
thepluggedinmode.
DefectiveAss'yPCB ReplacePCBmain.
Loudbuzzingnoisecanbeheard. 1.Loosefanandfanmotor
2.Loosescrewson
H.V.Transformer
3.ShortedH.V.Diode
Tightenscrewsoffanmotor.
TightenscrewsofH.V.Transformer.
ReplaceH.V.Diode.
Turntablemotordoesnotrotate. 1.Openorloosewiringof
turntablemotor.
2.Defectiveturntablemotor.
Replaceturntablemotor.
Ovenstopsoperationduring
cooking
1.Openorloosewiringofprimary
interlockswitch
2.Operationofthermal
cutout(Magnetron)
Adjustdoorandlatchswitches.
Sparks 1.Metallicwareorcookingdishes
touchingontheovenwall.
2.Ceramicwaretrimm edwith
goldorsilverpowderalso
causessparks.
Informthecustomer.
Donotuseanytypeofcookware
with
metallictrimming.
Unevencooking
Unevenintensityofmicrowavedue
toitscharacteristics.
Wrapthinnerpartsofthefoodwith
aluminumfoil.
Useplasticwraporcoverwithalid.
Stironceortwicewhilecooking
foodssuchassoup,cocoa,ormilk.
Noisefromtheturntablemotor
whenitstartstooperate.
Noisemayresultfromthemotor. Replaceturntablemotor.
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