Troubleshooting - Graco 190ES 309063F Repair Manual

Relieve pressure; page 6.
MOTOR WON'T OPERATE
TYPE OF PROBLEM
Basic Fluid Pressure
Problems
Basic Mechanical
Problems
Basic Electrical Problems
See Wiring Diagram, pages g g , p g
15 to 18.

Troubleshooting

WHAT TO CHECK
If check is OK, go to next check
1. Pressure control knob setting. Motor will not run
if at minimum setting (fully counterclockwise).
2. Spray tip or fluid filter may be clogged.
1. Pump (13) frozen or hardened paint.
2. Displacement pump connecting rod pin (9a).
Pin must be completely pushed into connecting
rod (9) and retaining spring (9b) must be firmly
in groove of pump pin. See Fig. 18.
3. Motor (1). Remove drive housing assembly
(10). See page 24. Try to rotate fan by hand.
1. Motor control board. Board shuts down and dis-
plays error code on some models.
2. Electrical supply. Meter must read 100--130
VAC for 110--120 VAC models and 210--255
VAC for 240 VAC models.
3. Extension cord. Check extension cord continu-
ity with volt meter.
4. Sprayer power supply cord. Inspect for damage
such as broken insulation or wires.
5. Fuse. Check replaceable fuse on control board. 5. Replace fuse after completing motor inspec-
6. Motor leads are securely fastened and properly
connected to control board.
7. Motor thermal switch. Yellow motor leads must
have continuity through thermal switch.
8. Brush cap missing or loose brush lead connec-
tions.
9. Brush length which must be 1/4 in. (6 mm) mini-
mum.
NOTE: Brushes do not wear at the same rate on
both sides of motor. Check both brushes.
10.Motor armature commutator for burn spots,
gouges and extreme roughness.
11. Motor armature for shorts using armature tester
(growler) or perform spin test, page 12.
12.Pressure control not plugged in to control board. 12.Insert pressure control connector into control
WHAT TO DO
When check is not OK refer to this column
1. Slowly increase pressure setting to see if mo-
tor starts.
2. Relieve pressure and clear clog or clean fil-
ter; refer to separate gun or tip instruction
manual.
1. Thaw sprayer if water or water-based paint
has frozen in sprayer. Place sprayer in warm
area to thaw. Do not start sprayer until
thawed completely. If paint hardened (dried)
in sprayer, replace pump packings. See
page 26 (Displacement Pump Replace-
ment).
2. Push pin into place and secure with spring re-
tainer.
3. Replace motor (1) if fan won't turn. See page
25.
1. See Motor Control Board Diagnostics,
page 19.
2. Reset building circuit breaker; replace build-
ing fuses. Try another outlet.
3. Replace extension cord.
4. Replace power supply cord.
tion.
6. Replace loose terminals; crimp to leads. Be
sure terminals are firmly connected.
Clean circuit board terminals. Securely re-
connect leads.
7. Replace motor. See page 25, Motor Re-
placement.
8. Install brush cap or replace brushes if leads
are damaged. See page 12, Motor Brush Re-
placement.
9. Replace brushes. See page 12, Motor Brush
Replacement.
10. Remove motor and have motor shop resur-
face commutator if possible. See page 25,
Motor Replacement.
11. Replace motor. See page 25, Motor Re-
placement.
board.
9
309063