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Electrical Tests
312900C 23
Electrical Tests
Electrical components inside the gun affect performance
and safety. The following procedures test the condition
of the power supply (18), barrel (16) and charging probe
(31), and electrical continuity between components.
Use megohmmeter Part No. 241079 (AA) and an
applied voltage of 500 V. Connect the leads as shown.
Test Total Gun Resistance
Measure resistance between the charging probe tip
(BB) and the air swivel (35) (see F
IG. 8.); it should be
90-130 megohms. If outside this range, go to the next
test. If in range, refer to Gun Repair on page 27 for
other possible causes of poor performance.
Fig. 8. Test Total Gun Resistance
Test Gun Resistance
Measure resistance between the air swivel (35) and the
charging probe socket (CC) (see F
IG. 9); it should be
70-95 megohms. If outside this range, check the power
supply and barrel resistance. If in range, test the charg-
ing probe resistance.
Test Charging Probe Resistance
Measure resistance between the metal spring in the
charging probe (DD) and the charging probe tip (BB)
(see F
IG. 9); it should be 15-30 megohms. If outside this
range, replace the charging probe. If in range, inspect
the spring and barrel socket for possible causes of poor
continuity. Reassemble the charging probe and retest
the gun resistance.
Fire, Explosion, and Electric Shock Hazard
Megohmmeter Part No. 241079 (AA-see F
IG. 8.
through F
IG. 12.) is not approved for use in a hazard-
ous areas. To reduce the risk of sparking, do not use
the megohmmeter to check electrical 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, explo-
sion, and electric shock and result in serious injury
and property damage.
AA
35
BB
ti1468ax
FIG. 9. Test Gun Resistance
F
IG. 10. Test Charging Probe Resistance
ti13731
AA
35
CC
ti13732
AA
BB
DD