Pressure Control Repair - Graco ASM 2700 Repair And Parts Manual

Note: Keep a new transducer on hand to use for test.
CAUTION
Do not allow sprayer to develop fluid pressure with-
out transducer installed. Leave drain valve open if
test transducer is used.
LED SPRAYER OPERATION
BLINKS
Once Sprayer runs
Once and Sprayer shuts down and LED stays ON
stays ON
Two times Sprayer shuts down and LED continues
repeatedly
to blink two times repeatedly
Three times Sprayer shuts down and LED continues
repeatedly
to blink three times repeatedly
Four times Sprayer shuts down and LED continues
repeatedly
to blink four times repeatedly
Five times Sprayer shuts down and LED continues
repeatedly
to blink five times repeatedly
Six times Sprayer shuts down and LED continues
repeatedly
to blink six times repeatedly
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Pressure Control Repair

Motor Control Board Diagnostics
1. Fig. 6--13. Remove four screws (23) and cover
(56).
2. Turn ON/OFF switch ON.
3. Observe LED operation and reference following
table:
4. Relieve pressure and unplug sprayer before ser-
vicing control board; page 6.
INDICATES
Normal operation
Motor open circuit or bad
control board
Run away pressure. Pres-
sure greater than 4500 psi
(310 bar, 31 MPa).
Pressure transducer is
faulty or missing
Line voltage is too high
Too much current
Motor thermal switch
open circuit
WHAT TO DO
Do nothing
Check motor brushes and
armature. If OK, replace mo-
tor control board.
Replace motor control board.
See following Motor Control
Board procedure.
Check transducer connection.
Open drain valve. Substitute
new transducer for transducer
in sprayer. If sprayer runs,
replace transducer.
Check for voltage supply
problems
Check for locked rotor,
shorted wiring or motor. Re-
pair or replace failed parts.
Check for binding in pump or
drive. Check for bad motor.