User's Manual

ElectricalTests
Test Test
Test
Power Power
Power
Supply Supply
Supply
Resistance Resistance
Resistance
1.Removethepowersupply(11).SeePower
SupplyRemovalandReplacement,page43.
2.Removethealternator(15)
fromthepowersupply.See
AlternatorRemovalandReplacement,page44.
3.Measureresistancefromthepowersupply's
groundstrips(EE)tothespring(11a).The
resistanceshouldbe:
•60–85megohmsfor40kVguns
•86–110megohmsfor60kVguns
•130–160megohmsfor85kVguns
4.Ifoutsidethisrange,replacethe
powersupply.Ifinrange,goto
TestElectrodeResistance,page32.
5.Ifyoustillhaveproblems,referto
ElectricalTroubleshooting,page35for
otherpossiblecausesofpoorperformance,or
contactyourGracodistributor.
6.Besurethespring(11a)isinplacebefore
reinstallingthepowersupply.
Figure18TestPowerSupplyResistance
Test Test
Test
Electrode Electrode
Electrode
Resistance Resistance
Resistance
Removetheelectrode(3).See
ElectrodeReplacement,page39.Measure
theresistancebetweenthecontact(HH)andthe
electrodewire(GG).Theresistanceshouldbe8-30
megohms.Ifoutofrange,replacetheelectrode.
NOTE: NOTE:
NOTE:
Ifthegunresistanceisstilloutofrangeafter
testingthepowersupplyandelectrode:
•Checkthattheconductiveo-ring(4a)ismaking
contactwiththebarrelpin.
•Checkthatthepowersupplyspring(11a)ismaking
contactwiththebarrelpin.
Figure19TestElectrodeResistance
32 3A2494D