Graco FinishPro II 395 Manual page 14

Troubleshooting
Problem
Basic Electrical
See wiring diagram, page 36
14
What To Check
(If check is OK, go to next check)
1. Electric supply. Meter must read
105-130 Vac for 110-120 Vac mod-
els and 210-255 Vac for 230 Vac
models.
2. Extension cord. Check extension
cord continuity with volt meter.
3. Sprayer power supply cord. Inspect
for damage such as broken insula-
tion or wires.
4. Motor leads are securely fastened
and properly connected to control
board.
5. Motor thermal switch. Yellow motor
leads must have continuity through
thermal switch.
6. Brush cap missing or loose brush
lead connections (FinishPro II 395
only).
7. Brush length which must be 1/4 in.
(6mm) minimum (FinishPro II 395
only).
NOTE: Brushes do not wear at the
same rate on both sides of motor.
Check both brushes.
8. Motor armature commutator for burn
spots, gouges and extreme rough-
ness.
9. Motor armature for shorts using
armature tester (growler) or perform
spin test, page 21.
10. Pressure control not plugged in to
control board.
What To Do
(When check is not OK, refer to this column)
Reset building circuit breaker, replace building
fuses. Try another outlet.
Replace extension cord. Use shorter extension
cord.
Replace power supply cord. See page 25, Power
Cord Replacement.
Replace loose terminals; crimp to leads. Be sure
terminals are firmly connected.
Clean circuit board terminals. Securely reconnect
leads.
Replace motor. See page 35, Motor Replacement.
Install brush cap or replace brushes if leads are
23
damaged. See page , Motor Brush Replace-
ment.
Replace brushes. See page
Replacement.
Remove motor and have motor shop resurface
commutator if possible. See page 35, Motor
Replacement.
Replace motor. See page 35, Motor Replacement.
Insert pressure control connector into control board.
23
, Motor Brush
333126A