Circuit Board Replacement - Graco A Series Instructions-Parts List Manual

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 and screws.
2. Turn the pressure control knob all the way counter-
clockwise to the minimum setting to release spring
tension on the board. Also check to be sure only
three or four threads of the pressure control knob
shaft are exposed below the pressure adjustment
nut (S). Back down the nut, if necessary . See 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. See Fig 28–2.
4. To remove the board from the box, pull out the black
plastic–tipped pin (330). Push the bottom of the cir-
cuit board toward the wall of the box and carefully
slide the board out.
5. Install the board in the box at the same angle as it
was removed.
YELLOW
CIRCUIT BOARD
Fig 28–2
307–958

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.
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 starting on page 30, if you installed a
board.
BLACK
WHITE
PRESSURE
CONTROL KNOB
S
CAUTION
PRESSURE CONTROL ADJUST-
306
MOTOR LEADS
MOTOR
THERMAL SWITCH
new