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1
1.Precaution
Followthesespecialsafetyprecautions.Althoughthemicrowaveoveniscompletelysafeduringordinaryuse,
repairworkcanbeextremelyhazardousduetopossibleexposuretomicrowaveradiation,aswellaspotentially
lethalhighvoltagesandcurrents.
1-1Safetyprecautions( )
1.Allrepairsshouldbedoneinaccordance
withtheproceduresdescribedinthis
manual.Thisproductcomplieswith
FederalPerformanceStandard21CFR
SubchapterJ(DHHS).
2.Microwaveemissioncheckshouldbe
performedtopriortoservicingiftheovenis
operative.
3.Iftheovenoperateswiththedooropen:
Instructtheusernottooperatetheovenand
contactthemanufacturerandthecenterfor
devicesandradiologicalhealthimmediately.
4.NotifytheCentralServiceCenterifthe
microwaveleakageexceeds5mW/cm
2
.
5.Checkallgrounds.
6.DonotpowertheMWOfroma"2-prong"
ACcord.Besurethatallofthebuilt-in
protectivedevicesarereplaced.Restoreany
missingprotectiveshields.
7.Whenreinstallingthechassisandits
assemblies,besuretorestoreallprotective
devices,including:nonmetalliccontrol
knobsandcompartmentcovers.
8.Makesurethattherearenocabinetopenings
throughwhichpeople--particularly
children--mightinsertobjectsandcontact
dangerousvoltages.Examples:Lamphole,
ventilationslots.
9.Informthemanufacturerofanyovenfound
tohaveemissioninexcessof5mW/cm
2
,
Makerepairstobringtheunitinto
complianceatnocosttoownerandtryto
determinecause.
Instructownernottouseovenuntilithas
beenbroughtintocompliance.
CENTRALSERVICECENTER
10.Servicetechniciansshouldremovetheir
watcheswhilerepairinganMWO.
11.Toavoidanypossibleradiationhazard,
replacepartsinaccordancewiththewiring
diagram.Also,useonlytheexact
replacementsforthefollowingparts:
Primaryandsecondaryinterlockswitches,
interlockmonitorswitch.
12.IfthefuseisblownbytheInterlockMonitor
Switch:Replaceallofthefollowingatthe
sametime:Primary,doorsensingswitch
andpowerrelay,aswellastheInterlock
MonitorSwitch.Thecorrectadjustmentof
theseswitchesisdescribedelsewherein
thismanual.Makesurethatthefusehasthe
correctratingfortheparticularmodelbeing
repaired.
13.DesignAlterationWarning:
Useexactreplacementpartsonly,i.e.,
onlythosethatarespecifiedinthe
drawingsandpartslistsofthismanual.
Thisisespeciallyimportantforthe
Interlockswitches,describedabove.
Neveralteroraddtothemechanicalor
electricaldesignoftheMWO.Anydesign
changesoradditionswillvoidthe
manufacturer'swarranty.Alwaysunplug
theunit'sACpowercordfromtheAC
powersourcebeforeattemptingto
removeorreinstallanycomponentor
assembly.
14.NeverdefeatanyoftheB+voltage
interlocks.DonotapplyACpowertothe
unit(oranyofitsassemblies)unlessall
solid-stateheatsinksarecorrectlyinstalled.
15.Somesemiconductor("solidstate")devices
areeasilydamagedbystaticelectricity.
Such
componentsarecalledElectrostatically
SensitiveDevices(ESDs).Examplesinclude
integratedcircuitsandfield-effect
transistors.
Immediatelybeforehandlingany
semiconductorcomponentsorassemblies,
draintheelectrostaticchargefromyour
bodybytouchingaknownearthground.
16.Alwaysconnectatestinstrument'sground
leadtotheinstrumentchassisgroundbefore
connectingthepositivelead;alwaysremove
theinstrument'sgroundleadlast.
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