Graco Inc. 307-712 Paint Sprayer User Manual


 
16
16
307-712
ELECTRICAL TESTS
The
performance of
the spray gun is directly af
fected 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 1
15 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
T
urbine 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 T
urbine Alternator
5
Power Supply
5c
Contact Spring
86
14
A
A
5c
5
EE
2a
1