Circuit Board Replacement - Graco Ultra 1000 Instructions-Parts List Manual

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Circuit Board
WARNING
Before doing this procedure, follow the
Pressure
Relief Procedure Warning on page
2 1
to reduce
Refer to Fig. 22 and 23.
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1. Remove the pressure control cover and screws.
CAUTION
Step 2 is essential to reduce the risk of damaging
the circuit board while removing or installing it.
2. Turn the pressure control knob all the
way coun-
terclockwise 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 pres-
sure adjustment nut
0.
Back down the nut. if
necessary. See Fig. 22.
3. Disconnect ail the circuit board wires, including
the
two
heavy black wires. Pay close attention to
where connections are made. See Fig. 23.
4.
To
remove
the
board from
the box,
pull
out
the
of the circuit board toward the wall of the box and
black plastic-tipped pin (330). Push the bottom
carefully slide the board out.
5. install the board in the box at the same angle as it
was removed,
SWITCH
MICRO-
A
/
T
Fig.
22
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 con-
trol cover.
These precautions are essential to reduce the risk
of a malfunction.
6.
Reconnect all wires. Refer to the wiring diagram in
Fig. 23.
7. Perform the Pressure Control Adjustment start-
ing on page 28, if you installed a new board.
RECTlflER '
I
POWER
CORD