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Troubleshooting
311911C 9
Basic Electrical
See wiring diagram, page 36
1. Electric supply. Meter must read
105-130 Vac for 110-120 Vac models
and 210-255 Vac for 230 Vac mod-
els.
Reset building circuit breaker, replace building fuses.
Try another outlet.
2. Extension cord. Check extension
cord continuity with volt meter.
Replace extension cord. Use shorter extension cord.
3. Sprayer power supply cord. Inspect
for damage such as broken insula-
tion or wires.
Replace power supply cord. See page 21, Power
Cord Replacement.
4. Fuse (FinishPro 390). Check
replaceable fuse on control board
(next to ON/OFF switch).
Replace fuse after completing motor inspection. See
page 23, Fuse Replacement.
5. Motor leads are securely fastened
and properly connected to control
board.
Replace loose terminals; crimp to leads. Be sure ter-
minals are firmly connected.
Clean circuit board terminals. Securely reconnect
leads.
6. Motor thermal switch. Yellow motor
leads must have continuity through
thermal switch.
Replace motor. See page 34, Motor Replacement.
7. Brush cap missing or loose brush
lead connections.
Install brush cap or replace brushes if leads are dam-
aged. See page 18, Motor Brush Replacement.
8. Brush length which must be 1/4 in.
(6mm) minimum.
NOTE: Brushes do not wear at the
same rate on both sides of motor.
Check both brushes.
Replace brushes. See page 18, Motor Brush
Replacement.
9. Motor armature commutator for burn
spots, gouges and extreme rough-
ness.
Remove motor and have motor shop resurface com-
mutator if possible. See page 34, Motor Replace-
ment.
10. Motor armature for shorts using
armature tester (growler) or perform
spin test, page 16.
Replace motor. See page 34, Motor Replacement.
11. Pressure control not plugged in to
control board.
Insert pressure control connector into control board.
Problem
What To Check
(If check is OK, go to next check)
What To Do
(When check is not OK, refer to this column)