Graco Inc. 222300 - Manual (Page 20)

20 307912
Electrical Tests
Test Power Supply Resistance
Remove the power cartridge (18) from the gun handle.
See Power Cartridge Replacement on page 27.
Remove the turbine alternator from the power car-
tridge. See Turbine Alternator Removal on page 28.
Measure the resistance from the power supply’s
ground contact point (EE) to the contact spring (18c)
on the other end of the power supply. See Fig. 8.
The resistance should be 157.5 to 192.5 megohms. If
the resistance is outside the specified range, the
power supply is defective and must be replaced. If the
resistance of the power supply is correct, proceed to
the next test.
If you still have problems, refer to the Electrical
Troubleshooting chart on page 18 for other possible
causes of poor performance, or contact the nearest
authorized service agency.
Test Resistor Stud Resistance
Insert a conductive rod (B) into the gun barrel (re-
moved for the power supply test) and against the metal
contact (C) in the front of the barrel. See Fig. 9.
Measure the resistance between the conductive rod
(B) and the gun electrode (20). The resistance should
be 21 to 29 megohms. If the resistance is correct,
resume spraying or refer to the Electrical
Troubleshooting chart on page 18 for other possible
causes of poor performance. Contact the nearest
authorized service agency if problems continue.
Fig. 8
18c
18
EE
A
03566B
Fig. 9
B
A
C
20
06448B
Continued on the next page.