Graco A Series Instructions-Parts List Manual page 15

ELECTRICAL TROUBLESHOOTING CHART
PROBLEM
Low or no electrostatic
wrap. (Spraying voltage
light does not come on).
Low or no electrostatic
wrap. (Spraying voltage
light is on all the time).
Spraying voltage stays
on when gun trigger is
released.
Operator gets mild
shock when touching
work piece.
CAUSE
Faulty Power Supply.
Air flow switch is stuck or
sluggish.
Faulty resistor stud (71).
Resistor (12) not making a good
connection with contact inside of
gun body.
High Voltage Cable not making
good contact with resistor (58a).
Cable insulation punctured.
Spring at transformer end of
cable not making good contact.
Electrical short in High Voltage
Cable.
Electrical short in gun.
Faulty Power Supply.
Air flow switch in Power Supply
not working or sluggish return.
Work piece not properly
grounded.
Operator not properly grounded
or is in contact with ungrounded
object.
Gun not properly grounded.
SOLUTION
See instruction manual included with
Power Supply.
Replace or repair air flow switch.
Replace the resistor stud.
See Resistor Assembly Replace–
ment, in the Service Section.
Replace conductive spring (58c)
as required.
Replace cable.
Stretch spring.
Replace the High Voltage Cable.
Take gun apart and visually check the
resistor housing (58b), resistor well
and needle well in the gun barrel (36)
for dirt and/or damage. Clean and
replace parts as required.
See instruction manual included with
Power Supply.
Check switch, replace if faulty.
Clean work piece hangers. Check for
proper ground on conveyor or track.
Be sure floor is properly grounded.
Wear shoes with non–insulating
soles. Be sure operator is not in
contact with or carrying any metallic
items which could build up electrical
charge. If a glove is worn, modify it
as shown on page 9. Be sure high
voltage cable is undamaged and
power supply is properly grounded.
See Check the Electrical Grounding
in the Installation Section.