32
308783
Service
Blinking or Blank Display
NOTE:
Do not exceed
100 psi (0.7 MPa, 7 bar) air
supply pressure to the ProMix air driven power supply.
Blinking Display
A blinking display is caused by low voltage to the
circuit board. Low voltage may indicate that the airsup-
ply pressure is too low or the air line filter is dirty.
Check the air supply pressure or replace the air line
filter with 114228 Air Filter Element.
Blank Display
A blank display indicates that there is no voltage to the
circuit board. This could be caused by failure of the
power supply turbine alternator (74g) or filter (74d).
See Fig. 18, page 36. It could also occur if the air
supply pressure is set above 100 psi (0.7 MPa, 7 bar).
If the alternator is spinning too quickly, the power
supply output will shut off to alert you to take action
and avoid damaging the alternator.
Make sure the air pressure to the power supply is not
set above 100 psi (0.7 MPa, 7 bar). Service the power
supply as instructed on page 36 if necessary.
Replacing the Circuit Board or Keypad
1.
Relieve the pressure as instructed on page 17.
2.
Turn off the power to the control (air and/or electri-
cal).
3.
Put on the grounding strap provided.
4.
Remove the control front cover (2). See Fig. 12.
5.
Loosen the two screws (21) from the control panel
(63) to allow the panel to drop forward.
6.
Disconnect the wire harnesses (94, 95) from the
two circuit board connectors (AC).
7.
Unscrew the four screws (63c) and remove the
circuit board cover (AA).
8.
Disconnect the ribbon cable (AB).
Replacing the Keypad
9.
Pull the keypad (63d) off the front of the control
panel (63), and slide the ribbon cable (AB) out of
the panel slot. See Fig. 12.
10. Remove the adhesive liner from the back of the
keypad (63d) to expose the sticky backing.
11. Slide the ribbon cable (AB) through the panel slot,
align the keypad (63d) with the recessed area on
the panel, and press it into place.
Replacing the Circuit Board
12. Unscrew the four hex standoffs (63b), and remove
the circuit board (63a). See Fig. 12.
13. Secure the new circuit board (63a) to the panel
with the hex standoffs (63b).
Reassembly
14. Connect the ribbon cable (AB) to the circuit board
(63a). See Fig. 12.
15. Place the cover (AA) over the circuit board (63a),
and secure it with the screws (63c).
16. Connect the wire harnesses (94, 95) to the two
circuit board connectors (AC).
17. Close the panel (63); be sure not to crimp or pinch
the wires. Secure the panel with the screws (21).
18. Install the front cover (2).
7493A
Fig. 12
2
21
63
94
AA
63a
63c
63d
63b
AB
AC
95
