Circuit Board - Graco 231–034 Instructions And Parts List

Circuit Board Replacement
WARNING
To reduce the risk of a serious injury, follow the
Pressure Relief Procedure on page 4 whenever
you are instructed to relieve the pressure.
NOTE: Refer to Fig. 18 and 19 for this procedure.
1. Relieve the pressure.
2. Remove the cover from the pressure control.
3. Turn the pressure to the minimum setting to
release the spring tension on the board. Be sure
that only three or four threads on the shaft of the
pressure–control knob are exposed below the
pressure–adjustment nut (S). Loosen the nut, if
necessary.
CAUTION
Step 2 is essential to reduce the risk of damaging
the circuit board while removing or installing it.
4. Disconnect the seven wires from the board. Pay
close attention to where the connections are
made.
5. Pull out the plastic–tipped pin (330). Push the bot-
tom of the circuit board (71) toward the wall of the
pressure control and carefully slide out the board.
6. Reinstall the new board in the pressure control at
the same angle as it was removed.
7. Reconnect all of the wires. Ease the pin (330) into
the retainer.
8. Perform the Pressure Control Adjustment, page
30, if you installed a new board.
Ç Ç Ç
Ç Ç Ç É É É É É É É É É É
É É
71
330
S
Fig. 18
A Blue
B White
C Black
D Yellow
E Red
A
B
C
D
E
71
330
Fig. 19
H
01221A