Circuit board replacement, Fig 21 – Graco ULTRA AIRLESS 230-963 User Manual
Page 23
CIRCUIT BOARD REPLACEMENT
(See
Figs
20
WARNING
Before doing this procedure, follow the Pressure
the risk of a fluid injection injury, splashing
in
the
Relief Procedure Warning on page
17 to reduce
eyes or on the skin, injury from moving parts, or
electric shock.
sure
to
rhe
BOARD
PRESSURE CONTROL
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
Back down the nut, if necessary.
See Fig
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
.
4. To remove the board from the box, pull out the
black plastic-tipped pin
Push the bottom of
the circuit 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.
6.
Reconnect all wires. Refer to the wiring diagram
in
Fig
21.
Fig
CAUTION
nector is centered exactly
in the wrap-around
Be sure the flat blade of the insulated male
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-
trol cover.
These precautions are essential to reduce the risk
of malfunction.
7. Perform the STALL PRESSURE CALIBRATION
on page
if you installed a new board.
TP7
21
PLUQ
22
307-671