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Electrical Tests
20 309295N
Test Barrel Resistance
1. Insert a conductive rod (B) into the gun barrel
(removed for the power supply test) and against the
metal contact (C) in the front of the barrel.
2. Measure the resistance between the conductive rod
(B) and the barrel contact ring (16a). See F
IG. 7.
The resistance should be 19-29 megohms. If the
resistance is incorrect, make sure the metal contact
(C) in the barrel and the barrel contact ring (16a) are
clean and undamaged.
3. If the resistance is still outside the range, remove
the barrel contact ring (16a) and measure the resis-
tance between the conductive rod (B) and the wire
lead at the bottom of the contact ring groove.
4. If the resistance is in range, replace the contact ring
(16a) with a new one. Press the contact ring firmly
into the groove on the front of the barrel.
5. If the resistance is still outside the range, replace
the barrel.
Fig. 7. Test Barrel Resistance
WARNING
Fire, Explosion, and Electric Shock
Hazard
The barrel contact ring (16a) is a conductive
contact ring, not a sealing o-ring. To reduce
the risk of sparking or electric shock, do not
remove the barrel contact ring (16a) except
to replace it and never operate the gun with-
out the contact ring in place. Do not replace
the contact ring with anything but a genuine
Graco part.
ti1515b
B
16a
C