21
308-799
Pressure
Control Repair
WARNING
INJECTION
HAZARD
T
o reduce the risk of serious injury
,
whenever you are instructed to relieve
pressure, follow the
Pressure Relief
Procedure
on page 7.
Motor Control Board Removal
1. Relieve
pressure.
2.
Fig. 16. Remove five screws (28) and cover (82).
3.
Disconnect from motor control board:
Six motor leads (B).
Lead (C) from power cord.
Lead (1
1
1) from ON/OFF switch.
Lead (D) from potentiometer
.
Lead (E) from transducer
.
4.
Remove four screws (102), washers (103) and
circuit board (104).
Motor Control Board Installation
1. Relieve
pressure.
2.
Fig. 16. Install motor control board (104) with four
screws (102) and washers (103).
3.
Connect to motor control board:
Lead (E) to transducer
.
Lead (D) to potentiometer
.
Lead (1
1
1) to ON/OFF switch.
Lead (C) to power cord.
Six motor leads (B).
4.
Install cover (82) with five screws (28).
Motor control board diagnostics
1. Relieve
pressure.
2.
Remove five screws (28) and cover (82).
See Fig. 16.
3. T
urn ON/OFF switch ON.
4.
Observe LED operation and reference following
table:
LED
BLINKS
SPRA
YER OPERA
TION INDICATES WHAT T
O DO
Once
Sprayer runs
Normal operation
Do nothing
Twice
Sprayer runs
Normal operation
Do nothing
T
wice
repeatedly
Sprayer shuts down and LED continues
to blink twice repeatedly
Line voltage is too
high
Lower line voltage to 120 V
AC
Three times
repeatedly
Sprayer shuts down and LED continues
to blink three times repeatedly
Pressure transducer
is faulty or missing
Replace pressure transducer
Four times
repeatedly
Sprayer shuts down and LED continues
to blink four times repeatedly
Run away pressure.
Pressure greater than
4500 psi.
Replace motor control board.
See preceding Motor control
board removal procedure.
Five times
repeatedly
Sprayer shuts down and LED continues
to blink five times repeatedly
Locked rotor
. Motor
can not turn because
of some mechanical
condition.
Clear obstruction and replace
broken parts preventing motor
from turning
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