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Troubleshooting
309977H 9
Basic Electrical Problems
(continued)
7. Brush length which must be 1/4
in, minimum. See page 14.
NOTE: Brushes do not wear at
the same rate on both sides of
motor. Check both brushes.
7. Replace brushes. See page 14.
8. For broken or misaligned motor
brush springs. Spring must rest
squarely on top of brush. See
page 14.
8. Replace brush if spring is broken. See
page 15.
9. Motor brushes may be binding in
brush holders. See page 15.
9. Clean brush holders. Remove carbon with
small cleaning brush. Align brush leads
with slot in brush holder to assure free ver-
tical brush movement.
10. Motor armature commutator for
burn spots, gouges and extreme
roughness. See page 14.
10. Remove motor and have motor shop
resurface commutator, if possible. See
page 15.
11. Motor armature for shorts using
armature tester (growler) or per-
form spin test. See page 13.
11. Replace motor. See page 15.
Refer to wiring diagram on
page 29 to identify test
points (TP).
1. Power supply cord. Connect volt
meter between TP1 (L1, 240
Vac) and TP2 (L2, Neutral). Plug
in sprayer. Meter must read:
210-235 Vac for 220-240 Vac
models; 85-130 Vac for 100-120
Vac models. Unplug sprayer.
1. Replace power supply cord.
2. Motor thermal cutoff switch. Turn
sprayer OFF. Check for continuity
between TO1 and TO2 with ohm-
meter.
2. If thermal switch is open (no continuity),
allow motor to cool. If switch remains open
after motor cools, replace motor. If thermal
switch closes after motor cools, correct
cause of overheating.
3. All terminals for damage or loose
fit.
3. Replace damaged terminals and recon-
nect securely.
TYPE OF PROBLEM
WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK, refer to this column