Graco 232903 Repair Manual page 6

MOTOR WON'T OPERATE (Continued)
TYPE OF PROBLEM
Basic Electrical Problems
(continued)
Refer to wiring diagram on
page 12, 13 or 14 to identify
test points (TP).
6
309063
Troubleshooting
WHAT TO CHECK
If check is OK, go to next check
5. That motor leads are securely fastened and
properly mated.
6. For loose motor brush lead connections and ter-
minals. See page 10.
7. Brush length which must be 1/2 in. minimum.
See page 10.
NOTE: Brushes do not wear at the same rate on
both sides of motor. Check both brushes.
8. For broken or misaligned motor brush springs.
Rolled portion of spring must rest squarely on
top of brush. See page 10.
9. Motor brushes may be binding in brush holders.
See page 10.
10.Motor armature commutator for burn spots,
gouges and extreme roughness.
See page 10.
11. Motor armature for shorts using armature tester
(growler) or perform spin test. See page 10.
1. Power supply cord (79). Connect volt meter be-
tween TP1 (neutral) and TP2 (L2, 120 Vac).
Plug in sprayer. Meter must read:
210–255 Vac for 220–240 Vac models.
85–130 Vac for 100–120 Vac models.
Unplug sprayer.
2. ON/OFF switch (23). Connect volt meter be-
tween L1 and L2 terminal on ON/OFF switch.
Plug in sprayer and turn ON.
Meter must read:
210–255 Vac for 220–240 Vac models.
85–130 Vac for 100–120 Vac models.
3. Motor thermal cutoff switch. Turn sprayer OFF.
Check for continuity between TO1 and TO2 with
ohmmeter.
4. All terminals for damage or loose fit.
WHAT TO DO
When check is not OK refer to this column
5. Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely re-
connect leads.
6. Tighten terminal screws. Replace brushes if
leads are damaged. See page 10.
7. Replace brushes. See page 10.
8. Replace spring if broken. Realign spring with
brush. See page 10.
9. Clean brush holders. Remove carbon with
small cleaning brush. Align brush leads with
slot in brush holder to assure free vertical
brush movement.
10.Remove motor and have motor shop resur-
face commutator if possible. See page 18.
11. Replace motor. See page 18.
1. Replace power supply cord.
2. Replace ON/OFF switch. See page 12.
3. 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.
4. Replace damaged terminals and reconnect
securely.