Hitachi ULTRA MAX 695 232133 - Manual (Page 24)

24 308801
Motor Control Board
Motor control board removal
WARNING
INJECTION HAZARD
To reduce the risk of serious injury, when
instructed to relieve pressure, follow the
Pressure Relief Procedure on page 8.
1. Relieve pressure.
2. Remove screws (25, 26) and lower heat sink (22)
and motor control board (22a). See Fig. 21.
3. Disconnect wires (C), (D), (96), (E) and 108 from
motor control board (22a). See Fig. 13.
4. Disconnect potentiometer (77) and transducer (67)
from motor control board (22a).
5. Remove four screws and motor control board
(22a).
6. Install new motor control board (22a) with four
screws. Reconnect all wires and secure heat sink
(22) to junction box (20).
CAUTION
To reduce the risk of a malfunction:
S Be sure the flat blade of the insulated male
connector is centered in the wrap–around blade of
the female connector when the connections are
made.
S Route all wires carefully to avoid interference with
the motor control board or junction box.
Motor control board diagnostics
1. Relieve pressure.
2. Remove screws (25, 26) and lower heat sink (22)
and motor control board (22a). See Fig. 21.
3. Turn ON/OFF switch ON.
4. Observe LED operation and reference following
table:
LED
BLINKS SPRAYER OPERATION INDICATES WHAT TO DO
Once Sprayer runs Normal operation Do nothing
Twice Sprayer runs Normal operation Do nothing
Twice
repeatedly Sprayer shuts down and LED continues
to blink twice repeatedly Line voltage is too
high Lower line voltage to 120 VAC
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