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308-08417
ELECTRICAL TESTS
Test Resistor Stud Resistance
(See Fig 13 )
Remove
the resistor stud. See
Air Cap/Nozzle/Resistor
Stud Replacement. Check the resistance between the
black resistor stud ring contact (D) and the needle con-
tact
ring (E). Y
ou 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
The resistor stud contact ring (D) is a conductive
contact ring, NOT a sealing o-ring. T o reduce the
risk
of sparking, which could
cause fire, explosion,
or electrostatic shock and result in serious injury ,
DO
NOT
remove the resistor stud contact ring (D)
from the resistor stud or operate the gun without
the contact ring in place. DO NOT replace the re-
sistor
stud with anything but a genuine Graco
part.
Fig
13
KEY
D Resistor
Stud Contact Ring
E
Needle Contact Ring
D
E
0442