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TYPE OF
WHAT TO CHECK
PROBLEM
If check is OK, go to next check
Electrical
4. Motor brushes for the following:
(continued)
a. Loose terminal screws.
b. Broken or misaligned brush springs.
c. Brushes binding in holders.
d. Broken leads.
e. Worn brushes.
f. Brush leads snagged on spring clip.
NOTE: Brushes do not wear at same rate on both
sides of motor. Check both brushes.
5. Motor armature commutator for burn spots, gouges and
extreme roughness. Remove motor cover and brush in-
spection plates to check. See page 10.
6. Motor armature for shorts using armature tester (growler)
or perform motor test. See page 9.
7. That leads from pressure transducer and motor to motor
control board (22a) are securely fastened and properly
mated.
8. Motor control board (22a) by performing motor control
board diagnostics on page 13. If diagnostics indicate, sub-
stitute with a good board.
CAUTION: Do not perform this check until motor armature
is determined to be good. A bad motor armature can burn
out a good board.
9. Power cord (30).
Disconnect black and white power cord terminals; connect
volt meter to these leads.
Plug in sprayer. Meter must read 105–125 VAC.
Unplug sprayer.
10. ON/OFF switch (80).
Disconnect black wire (96) between motor control board
(22a) and switch and connect volt meter between exposed
terminal of (96) and power cord white wire. Plug in sprayer
and turn ON.
Meter must read 105–110 VAC.
Turn OFF and unplug sprayer.
Basic Problem Solving
WHAT TO DO
When check is not OK, refer to this column
4. Refer to page 10.
a. Tighten.
b. Replace broken spring and/or align
spring with brush
c. Clean brush holders. Remove carbon
with small cleaning brush. Align brush
leads with slot in brush holder to as-
sure free vertical brush movement.
d. Replace brushes
e. Replace brushes if less than 0.5 in.
(12.5 mm) long.
f. Correctly route wires. See page 10.
5. Remove motor and have motor shop
resurface commutator if possible.
See page 12.
6. Replace motor. See page 12.
7. Replace loose terminals; crimp to leads.
Be sure male terminal blades are straight
and firmly connected to mating part.
8. Replace board. See page 13.
9. Replace power cord.
See page 14.
10. Replace ON/OFF switch. See page 14.
309069
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