Test Power Supply Resistance; Test Resistor Stud Resistance - Graco PRO 5500wb Instructions-Parts List Manual

Test Power Supply Resistance

1. Prepare the gun for service as instructed on
page 35.
2. Remove the power supply (27) from the gun body
(29) as instructed on page 42.
3. Remove the turbine alternator (25) from the power
supply as instructed on page 43.
4. Measure the resistance from the power supply's
ground contact point (R) to the contact inside of
the power supply seal (D) [the conductive rubber
contact may be slightly recessed into the seal].
See Fig. 23.
5. 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 resistance of the power supply is correct,
proceed to the next test.
D
27
Fig. 23
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Electrical Tests

Test Resistor Stud Resistance

1. Prepare the gun for service as instructed on
2. Remove the resistor stud (15) as instructed on
3. Check the resistance between the black resistor
4. The resistance should be 21 to 29 megohms. If the
L
R
TI0378
Fig. 24
page 35.
page 36.
stud ring contact (S) and the needle contact ring
(T). See Fig. 24. You may have to press down on
the contact ring (S) in several places to get a good
reading.
resistance is correct, make sure the metal contact
in the gun barrel and the needle contact ring (T)
are clean. If the resistance is outside the specified
range, the resistor is defective and the resistor
stud (15) must be replaced. See page 36 to re-
place the resistor stud.
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
The resistor stud contact ring (S) is a
conductive contact ring, not a sealing
o-ring. See Fig. 24. To reduce the risk of
sparking, which could cause a sparking
or electric shock, do not remove the
resistor stud contact ring (S) or operate
the gun without the contact ring in place.
Do not replace the resistor stud (15) with
anything but a genuine Graco part.
15
T
S
0442