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Electrical Tests
Test Power Supply Resistance (See Fig. 9)
Remove the power supply (18) from the gun. See
Power Supply Removal and Replacement, page 27.
Remove the turbine alternator from the power supply.
See Turbine Alternator Removal and Replacement,
page 28.
Measure the resistance from the power supply’s
ground contact point (EE) to the contact inside of the
power supply seal (B) [the conductive rubber contact
may be slightly recessed into the seal].
The resistance should be 297 to 363 megohms. If the
resistance is outside the specified range, the power
supply is defective and must be replaced. If the resis-
tance of the power supply is correct, proceed to the
next test.
If you still have problems, refer to Electrical
Troubleshooting for other possible causes of poor
performance, or contact the nearest authorized service
agency.
NOTE: Be sure the seal (B) is in place on the end of
the power supply before installing the power supply
back into the gun.
Fig. 9
18
EE
A
B
TI0378
Test Resistor Stud Resistance (See Fig. 10)
Remove the resistor stud (22). See Air Cap/Nozzle/
Resistor Stud Replacement, page 22. Check the
resistance between the black resistor stud contact ring
(D) and the needle contact ring (E). You may have to
press down on the contact ring (D) in several places to
get a good reading.
The resistance should be 21 to 29 megohms. If the
resistance is correct, make sure the metal contact in
the gun barrel and the needle contact ring (E) are
clean. If the resistance is outside the specified range,
the resistor is defective and the resistor stud (2) must
be replaced. See Air Cap/Nozzle/Resistor Stud
Replacement.
WARNING
FIRE, EXPLOSION, AND
ELECTRIC SHOCK HAZARD
The resistor stud contact ring (D) is a
conductive contact ring, not a sealing
o-ring. See Fig. 10. To reduce the risk of
sparking or electric shock, do not
remove the resistor stud contact ring (D)
or operate the gun without the contact
ring in place. Do not replace the resistor
stud (22) with anything but a genuine
Graco part.
Fig. 10
D
E
0442
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