Graco 231-033 Instructions-Parts List Manual page 28

WARNING
To reduce the risk of serious injury, follow the illus-
trated Pressure Relief Procedure
page 24 whenever you are instructed to relieve
pressure.
NOTE: Read the GENERAL REP AIR INFORMATION
on page 24 before doing this procedure.
NOTE: Refer to Fig 28–1 and 28–2 for this procedure.
1. Relieve pressure.
2. Remove the pressure control cover.
3. Turn the pressure control knob to the minimum set-
ting to release spring tension on the board. Check to
be sure only three or four threads of the pressure
control knob shaft 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 all seven wires from the board. Pay close
attention to where connections are made.
BLUE
WHITE
BLACK
YELLOW
RED
71
330
Fig 28–2
CIRCUIT BOARD REPLACEMENT
warning on
BLACK
GREEN
GROUND
WIRE
POWER SUPPLY CORD
5. Pull out the plastic-tipped pin (330). Push the bottom
of the circuit board (71) toward the wall of the pres-
sure control and carefully slide the board out.
6. Reinstall the new board in the pressure control at the
same angle as it was removed.
7. Reconnect all wires. Ease the pin (330) into the re-
tainer.
8. Perform the PRESSURE CONTROL ADJUST-
MENT, page 30, if you installed a new board.
PRESSURE
CONTROL KNOB
CIRCUIT
BOARD
330
S
Fig 28–1
WHITE
MOTOR
THERMAL SWITCH
Ç Ç Ç
Ç Ç Ç É É É É É É É É
É É
MOTOR
LEADS