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.
A
EE
B 18
TI0378
Fig. 9
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
22
D
E
0442
Fig. 10
