Circuit Board - Graco ULTRA 1000 Instructions-Parts List Manual

CIRCUIT BOARD REPLACEMENT
Before doing this procedure, follow the Pressure
Rellef Procedure Warning on page 13 to reduce
the risk of a fluid injection injury, injury from mov-
1. Remove the pressure control cover end screw.
2. Turn the pressure control knob all the way counter-
clockwise to the minimum setting to release spring
tension on the circuit board (23). Also check to be
sure only three or four threads of the pressure con-
justment nut
(SI.
Back down the nut, if necessary.
trol knob shaft are exposed below the pressure ad-
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, i n c d n g the
two
heavy black wires. Refer to Fig 19. Pay close
attention to where connections are made.
4. To remove the board from the box, pull out the
the circuit board toward the wall of the box and
black plastic-tipped pin (330). Push the bottom of
carefully slide the board out.
5. Install the board in the box et the same angle as
it
was removed. Reconnect the wires as indicated in
Fig 19. Ease the pin
K N O )
into the retainer.
CIRCUIT BOARD218397A. 5 Wires
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 ere made.
Route all wires carefully to avoid interference with
the circuit board, bourdon tube end pressure con-
trol cover.
~
6. Perform the Stall Pressure Calibration on page
27.
Fig 18
a
3 0 9 7
-
Fig 19
307-785 2 6