Electrical Tests
Test Power Sup
ply Resistance
1. Remove the power supply (11). See Power
Supply Removal and Replacement, page 43.
2. Remove the alternator (15)
from the power supply. See
Alternator Removal and Replacement, page 44.
3. Measure resistance from the power supply's
ground strips (EE) to the spring (11a). The
resistance should be:
• 60–85 megoh
ms for 40kV guns
• 86–110 meg
ohms for 60kV guns
• 130–160 me
gohms for 85kV guns
4. If outside
this range, replace the
power supp
ly. If in range, go to
Test Elec
trode Resistance, page 32.
5. If you sti
ll have problems, refer to
Electric
al Troubleshooting, page 35 for
other pos
sible causes of poor performance, or
contact
your Graco distributor.
6. Be sure t
he spring (11a) is in place before
reinsta
lling the power supply.
Figure 18 Test Power Supply Resistance
Test Electrode Resistance
Remove the ele
ctrode (3). See
Electrode Rep
lacement, page 39.Measure
the resistanc
e between the contact (HH) and the
electrode wir
e(GG).Theresistanceshouldbe8-30
megohms. If o
ut of range, replace the electrode.
NOTE: If the gun resistance is still out of range after
testing the power supply and electrode:
• Check that the conductive o-ring (4a) is making
contact with the barrel pin.
• Check that the power supply spring (11a) is making
contact with the barrel pin.
Figure 19 Test Electrode Resistance
32 3A2494E
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