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2
1-2SpecialServicingPrecautions(Continued)
17.Whencheckingthecontinuityofthewitches
ortransformer,alwaysmakesurethatthe
powerisOFF,andoneoftheleadwiresis
disconnected.
18.Componentsthatarecriticalforsafetyare
indicatedinthecircuitdiagramby
shading, or.
19.Usereplacementcomponentsthathavethe
sameratings,especiallyforflameresistance
anddielectricstrengthspecifications.A
replacementpartthatdoesnothavethe
samesafetycharacteristicsastheoriginal
mightcreateshock,fireorotherhazards.
1-3SpecialHighVoltagePrecautions
1.HighVoltageWarning
Donotattempttomeasureanyofthehigh
voltages--thisincludesthefilamentvoltage
ofthemagnetron.Highvoltageispresent
duringanycookcycle.
Beforetouchinganycomponentsorwiring,
alwaysunplugtheovenanddischargethe
highvoltagecapacitor(SeeFigure1-1)
2.Thehigh-voltagecapacitorremainscharged
about30secondsafterdisconnection.Short
thenegativeterminalofthehigh-voltage
capacitortototheovenchassis.(Usea
screwdriver.)
3.Highvoltageismaintainedwithinspecified
limitsbyclose-tolerance,safety-related
componentsandadjustments.Ifthehigh
voltageexceedsthespecifiedlimits,check
eachofthespecialcomponents.
PRECAUTION
ThereexistsHIGHVOLTAGEELECTRICITY
withhighcurrentcapabilitiesinthecircuitsofthe
HIGHVOLTAGETRANSFORMERsecondary
andfilamentterminals.Itisextremelydangerous
toworkonornearthesecircuitswiththeoven
energized.
DONOTmeasurethevoltageinthehighvoltage
circuitincludingfilamentvoltageofmagnetron.
PRECAUTION
Nevertouchanycircuitwiringwithyourhand
norwithuninsulatedtoolduringoperation.
PRECAUTION
Servicemenshouldremovetheirwatches
wheneverworkingclosetoorreplacingthe
magnetron.
H.VCapacitor
Short
H.V.Diode
Touchchassisgroundfirstthenshorttothe
highvoltagecapacitorterminalbyusing
screwdriverorjumperwire.
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