Technical data

Troubleshooting
311990H 9
Basic Electrical
See wiring diagram, page
27
1. Electric supply. ON/OFF switch in
OFF position. Meter must read
100-130 Vac.
Turn ON/OFF switch to ON position. Reset
building circuit breaker, replace building fuses.
Try another outlet.
2. Extension cord. Check extension
cord continuity with volt meter.
Replace extension cord.
3. Sprayer power supply cord.
Inspect for damage such as bro-
ken insulation or wires.
Replace power supply cord. See page 25,
Power Cord Replacement.
4. Fuse. Check replaceable fuse on
control board (next to ON/OFF
switch).
Replace fuse after completing motor inspec-
tion. See page 20, Fuse Replacement.
5. Motor leads are securely fas-
tened and properly connected to
control board.
Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely recon-
nect leads.
6. Motor thermal switch. Yellow
motor leads must have continuity
through thermal switch.
Replace motor. See page 26, Motor Replace-
ment.
7. Brush cap missing or loose brush
lead connections.
Install brush cap or replace brushes if leads
are damaged. See page 17, Motor Brush
Replacement.
8. Brush length which must be
greater than 1/4 in. (6mm).
NOTE: Brushes do not wear at
the same rate on both sides of
motor. Check both brushes.
Replace brushes. See page 17, Motor Brush
Replacement.
9. Motor armature commutator for
burn spots, gouges and extreme
roughness.
Remove motor and have motor shop resurface
commutator if possible. See page 26, Motor
Replacement.
10. Motor armature for shorts using
armature tester (growler) or per-
form spin test, page 15.
Replace motor. See page 26, Motor Replace-
ment.
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)