Loading ...
Loading ...
Loading ...
32
9 HighVoltageCapacitor
1.Checkcontinuityofthecapacitorwiththemetersetatthehighestresistancescale.
2.Oncethecapacitorischarged,anormalcapacitorshowscontinuityforashorttime,andthenindicates9M .
3.Ashortedcapacitorwillshowcontinuouscontinuity.
4.Anopencapacitorwillshowconstant9M .
5.Resistancebetweeneachterminalandchassisshouldreadinfinite.
9-1 HighVoltageDiode
1.Isolatethediodefromthecircuitbydisconnectingitsleads.
2.Withtheohm-metersetatthehighestresistancescale,measureacrossthediodeterminals.Reversethe
meterleadsandreadtheresistance.Ameterwith6V,9Vorhighervoltagebatteriesshouldbeusedto
checkthefront-tobackresistanceofthediode(otherwiseaninfiniteresistancemaybereadinboth
directions).TheresistanceofanormaldiodewillbeinfiniteinonedirectionandseveralhundredK inthe
otherdirection.
9-2 MainRelayandPowerControlRelay
1.TherelaysarelocatedonthePCBAss'y.Isolatethemfromthemaincircuitbydisconnectingtheleads.
2.Operatethemicrowaveovenwithawaterloadintheoven.Setthepowerlevelsettohigh.
3.Checkcontinuitybetweenterminalsoftherelaysafterthestartpadispressed.
9-3 AdjustmentofPrimarySwitch,DoorSensingSwitchandMonitorSwitch
1.WhenmountingPrimaryswitchandInterlock
MonitorswitchtoLatchBody,consultthefigure.
2.Nospecificadjustmentduringinstallationof
PrimaryswitchandMonitorswitchtothelatch
bodyisnecessary.
3.WhenmountingtheLatchBodytotheoven
assembly,adjusttheLatchBodybymovingitso
thattheovendoorwillnothaveanyplayinit.
Checkforplayinthedoorbypullingthedoor
assembly.Makesurethatthelatchkeysmove
smoothlyafteradjustmentiscompleted.
CompletelytightenthescrewsholdingtheLatch
Bodytotheovenassembly.
4.ReconnecttoMonitorswitchandcheckthe
continuityofthemonitorcircuitandalllatch
switchesagainbyfollowingthecomponentstest
procedures.
5.Confirmthatthegapbetweentheswitch
housingandtheswitchactuatorisnomorethan
0.5mmwhendoorisclosed.
6.
InterlockSwitchReplacement
-When
replacingfaultyswitches,besureswitchmounting
tabsarenotbent,brokenorotherwisedeficientin
theirabilitytosecuretheswitchesinplace.
DoorOpen DoorClosed
Primaryswitch
Monitorswitch(COM-NC)
Monitorswitch(COM-NO)
DoorSensingS/W
∞
0
∞
∞
0
∞
0
0
PrimaryInterlockSwitch
Interlock
Monitor
Switch
BodyLatch
LeverDoor(B)
DoorSensing
Switch
Precaution
Forcontinuedprotectionagainstradiationhazard,replacepartsinaccordancewiththewiringdiagramandbesureto
usethecorrectpartnumberforthefollowingswitches:Primaryandsecondaryinterlockswitches,andtheinterlock
monitorswitch(replacealltogether).Thenfollowtheadjustmentproceduresbelow.Afterrepairandadjustment,be
suretocheckthecontinuityofallinterlockswitchesandtheinterlockmonitorswitch.
LeverDoor(B)
Loading ...
Loading ...
Loading ...