HP GRACO OR PRO TI1681A - Manual (Page 30)

Electrical Tests
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Electrical Tests
Electrical components inside the gun affect performance
and safety. The following procedures test the condition
of the power supply (18) and electrode (29), and electri-
cal continuity between components.
Use megohmmeter Part No. 241079 (AA) and an
applied voltage of 500 V. Connect the leads as shown.
Test Gun Resistance
1. Prepare the gun for service as instructed on page
41.
2. Measure resistance between the electrode needle
tip (29) and the air swivel (35); it should be 117-137
megohms. If outside this range, go to the next test. If
you still have problems, refer to Voltage Loss Trou-
bleshooting on page 34 for other possible causes
of poor performance, or contact your Graco distribu-
tor.
Fig. 17. Test Gun Resistance
WARNING
Fire, Explosion, and Electric Shock Hazard
Megohmmeter Part No. 241079 (AA-see
F
IG . 17.) is not approved for use in a haz-
ardous area. To reduce the risk of sparking,
do not use the megohmmeter to check elec-
trical grounding unless:
• The gun has been removed from the
hazardous area;
• Or all spraying devices in the hazardous
area are turned off, ventilation fans in the
hazardous area are operating, and there
are no flammable vapors in the area
(such as open solvent containers or
fumes from spraying).
Failure to follow this warning could cause
fire, explosion, and electric shock and result
in serious injury and property damage.
TI1688B
AA
35
29