16
ELECTRICAL TESTS
The performance of the spray gun is directly affected by
the condition of the electrical components contained
inside the gun. The electrical tests below can be used to
determine the condition of the power supply (5) and the
resistor stud (17) as well as the continuity of the electrical
path between the components.
Use megohmmeter 218–979 (see ACCESSORIES) and
an applied voltage of 500 volts to complete these electri-
cal tests. Connect the leads as shown.
WARNING
To reduce the risk of sparking, which could cause
fire or explosion and result in serious bodily injury,
DO NOT use the megohmmeter in the hazardous
area. Remove the gun from the hazardous area
before testing it.
Test Gun Resistance
NOTE: Check the resistance with the gun triggered and
untriggered.
Measure the resistance between the end of the electrode
(14) and the gun air inlet adapter (86). See Fig 7. The re-
sistance should be between 115 to 152 megohms. If the
resistance is outside the specified range, go to the next
test. If the resistance is correct, refer to the Electrical
Troubleshooting Chart on page 15 for other possible
causes of poor performance.
Test Power Supply Resistance
Remove the power cartridge (2) from the gun body (1).
See Power Cartridge Replacement.
Remove the turbine alternator (2a) from the power sup-
ply (5). See Turbine Alternator Removal.
Measure the resistance from the center prong (EE) in the
power supply to the contact spring (5c) on the other end
of the power supply. See Fig 8.
The resistance should be 95 to 122 megohms. If the re-
sistance 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.
If you still have problems, refer to the Electrical
Troubleshooting Chart for other possible causes of
poor performance, or contact the nearest authorized
service agency.
Fig 7
KEY
A
Megohmmeter
1
Gun Body
14
Electrode
86
Air Inlet Adapter
Fig 8
KEY
A
Megohmmeter
EE
Connector Prong
2a
Turbine Alternator
5
Power Supply
5c
Contact Spring
86
14
A
A
5c
5
EE
2a
1
Summary of Contents for 218-745
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