Graco Inc 222700 Test Power Supply Resistance, Test Resistor Stud Resistance, Electrical Tests

Electrical Tests

Test Power Supply Resistance

1.Prepare the gun for service as instructed on page 30.

2.Remove the power supply (18) from the gun handle as instructed on page 40.

3.Remove the turbine alternator (37) from the power supply as instructed on page 41.

4.Measure the resistance from the power supply’s ground contact point (B) to the contact spring (18c) on the other end of the power supply. See Fig. 14.

5.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.

KEY-Fig. 14
A	Megohmmeter
B	Ground Contact Point	A

18Power Supply

18c Contact Spring

B

18c 18

Test Resistor Stud Resistance

1.Prepare the gun for service as instructed on page 30.

2.Remove the resistor stud (22) as instructed on page 30.

3.Check the resistance between the black resistor stud contact ring (D) and the needle contact ring

(C). See Fig. 15. You may have to press down on the contact ring (D) in several places to get a good reading.

4.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 (C) are clean. If the resistance is outside the specified range, the resistor is defective and the resistor stud (22) must be replaced. See page 30 to re- place the resistor stud.

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. 15. To reduce the risk of sparking, which could cause a 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.

KEY-Fig. 15

CNeedle Contact Ring

DResistor Stud Contact Ring

22 Resistor Stud

22

D

Fig. 14

03566

C

0442

Fig. 15

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