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WARNING
Before doing this procedure, follow the
Relief Procedure W arning 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!
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.
YELLOW
71
Fig 28–2
307–786
CIRCUIT BOARD REPLACEMENT
Pressure
BLUE
WHITE
BLACK
RED
330
GREEN
GROUND
WIRE
POWER SUPPLY CORD
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
Fig 28–1
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
MENT, page 30, if you installed a new board.
BLACK
WHITE
S
CAUTION
PRESSURE CONTROL ADJUST-
MOTOR LEADS
MOTOR
THERMAL SWITCH
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