16 309674
Pressure Control Repair
Motor Control Board
Removal
Refer to Fig. 10 or 11 depending on sprayer voltage.
1.
Relieve pressure; page 4.
2. Remove four screws (12) and cover (50).
3. Disconnect all leads to motor control board (49).
4. Remove six screws (6) and circuit board (49).
Installation
1. Clean pad on rear of motor control board. Apply
small amount of thermal compound 073019 to pad.
2. Fig. 10. Install motor control board (49) with six
screws (6).
3. Connect all leads to motor control board (49). See
Fig. 10 for 100, 120 Vac and Fig. 11 for 110, 240
Vac.
4. Bundle and tie all loose wires so none lay in con-
tact with inductor coil (not 120 Vac sprayers). See
Wiring Diagram CAUTION, Fig. 11.
5. Install cover (50) with four screws (12).
Motor Control Board Diagnostics
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.
1. For sprayers with digital display, see Digital Dis-
play Messages, page 17.
2. Remove four screws (12) and cover (50).
See Fig. 10.
3. Turn ON/OFF switch ON.
4. Observe LED operation and reference following
table:
5.
Relieve pressure and un-
plug sprayer before servic-
ing control board; page 4.
LED
BLINKS
SPRAYER OPERATION INDICATES
WHAT TO DO
Once Sprayer runs Normal operation Do nothing
Two times
repeatedly
Sprayer shuts down and LED continues to
blink two times repeatedly
Run away pressure. Pres-
sure greater than 4500 psi
(310 bar, 31 MPa) or dam-
aged pressure transducer.
Replace motor control board or
pressure transducer.
Three times
repeatedly
Sprayer shuts down and LED continues to
blink three times repeatedly
Pressure transducer is
faulty or missing
Check transducer connection.
Open drain valve. Substitute
new transducer for transducer
in sprayer. If sprayer runs, re-
place transducer.
Four times
repeatedly
Sprayer shuts down and LED continues to
blink four times repeatedly
Line voltage is too high Check for voltage supply prob-
lems
Five times
repeatedly
Sprayer does not start or shuts down and
LED continues to blink five times repeat-
edly
Motor fault Check for locked rotor, shorted
wiring or disconnected motor.
Repair or replace failed parts.
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