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

CIRCUIT BOARD REPLACEMENT
Relief Procedure Wernlng on page 13 to reduce
the risk of e fluid injection injury, injury from mov-
ing
parts,
or electric shock.
Unplug the
sprayer!
1. Remove
the
pressure control
cover
and screws.
2.
Turn the pressure control knob
all
the way counter-
clockwise to the minimum setting to relee58 spring
tension on the circuit board (23). Also check to be
sure only three or four threads of the pressure con-
trol knob shaft are exposed below the Dressure ed-
justrnent nut
( S I . Back down the nut, if necessaly.
See Fig 18.
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
attention to where connections are made.
two heavy black wires. Refer to
Fig
19. Pay close
4. To remove the board from the box, pull out the
black plastic-tipped pin (330). Push the bofTom of
the circuit board toward the wall of the box end
carefully slide the board out.
5. Install the board in the box at the same angle as
it
was removed. Reconnect the wires es indicated in
Fig
19. Ease the pin
(3301
into the retainer.
CAUTION
' To reduce the risk of malfunction, be sure the flat
blade of the insulated male connector are
centered exactly in the wrap-around blade of the
female connector when connections are made.
Route all wires carefully to avoid interference with
the circuit board, bourdon tube and pressure con-
,
trnl nnvar.
6.' Perform the Stall Pressure Calibration on page
2 7 .
n g 19
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