28
307–785
CIRCUIT
BOARD
REPLACEMENT
Before doing this procedure, follow the Pressure
Relief Procedure Warning on page 24 to reduce
the risk of a fluid injection injury , splashing in the
eyes or on the skin, injury from moving parts, or
electric shock.
Unplug the sprayer!
WARNING
Refer to Fig 28–1 and 28–2.
1. Remove the pressure control cover
.
2.
Turn the pressure control knob to the minimum set-
ting
to release spring tension on the board. Check to
be sure only three or four threads of the pressure
control knob shaft are exposed below the pressure
adjustment
nut (S). Loosen the nut, if necessary
.
Re
-
fer
to Fig 28–1.
CAUTION
Step 2 is essential to reduce the risk of damaging
the
circuit board while removing or installing it.
3. Disconnect ALL wires from the board, including the
two
heavy black wires. Pay close
attention to where
connections
are made. Refer to Fig 28–2.
4.
Pull
out the black plastic–tipped pin (330). Push the
bottom
of the circuit board toward the wall of the con
-
trol
and carefully slide the board out.
5.
Reinstall
the new board in the box at the same angle
as
it was removed.
6.
Reconnect all wires. Refer to the wiring diagram in
Fig
28–2. Ease the pin (330) into the retainer
.
PRESSURE
CONTROL KNOB
CIRCUIT
BOARD
330
S
Fig
28–1
CAUTION
Be
sure the flat blade of the insulated male connec
-
tor
is centered in the wrap–around blade of the
fe
-
male
connector when the connections are made.
Route
all wires carefully to avoid interference with
the
circuit board, bourdon tube, or pressure control
cover.
These
precautions are essential to reduce the
risk
of
a malfunction.
7.
Perform the PRESSURE CONTROL ADJUST-
MENT,
page 30, if you installed a new board.
Fig 28–2
AC1
AC2
G1
G2
_
+
WHITE
BLUE
YELLOW
RED
GREEN
BLACK
WHITE
THERMAL SWITCH
GROUND
WIRE
BLACK
POWER SUPPLY CORD
MOTOR
330
MOTOR
LEADS
71
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