Graco Inc. 232633 - Manual (Page 14)

308870 14
Pressure Control
Control Board Diagnostics
1. Fig. 15. Remove five screws (307) and
cover (322).
2. Start sprayer.
3. Turn ON/OFF switch ON.
4. Observe LED operation and reference following
table:
LED
BLINKS SPRAYER OPERATION INDICATES WHAT TO DO
Two times
repeatedly Sprayer shuts down and LED contin-
ues to blink two times repeatedly Run away pressure.
Pressure greater than
4500 psi (310 bar, 31
MPa). 1. Check pressure transducer con-
nection at control board
2. Replace pressure transducer
3. Replace control board
Three
times re-
peatedly Sprayer shuts down and LED contin-
ues to blink three times repeatedly Pressure transducer is
faulty or missing 1. Check pressure transducer con-
nection at control board
2. Replace pressure transducer
3. Replace control board
Four times
repeatedly Sprayer shuts down and LED contin-
ues to blink four times repeatedly Generator voltage is
low 1. Increase engine throttle
2. Check wiring connections
3. Service Honda engine alternator
Five times
repeatedly Sprayer shuts down and LED contin-
ues to blink five times repeatedly High clutch current 1. Check clutch 5-pin bulkhead con-
nector. Clean contacts.
2. Measure 1.7 ± 0.2 Ω across clutch
field at 70 _ F
3. Replace clutch field assembly
Six times
repeatedly Sprayer shuts down and LED contin-
ues to blink six times repeatedly High clutch temperature 1. If clutch is new, let sprayer cool
down and then restart
2. Inspect clutch. Replace clutch if
there is excessive wear.
3. Remove pump pin, separate pin-
ion housing from clutch housing.
Rotate rotor clockwise to check
for excessive drag.