Maintenance
3A1182B
15
Replacement of Electrical
Components
NOTE:
Anytime the pressure control assembly, sensor,
or both are replaced, perform the calibrations.
Pressure Control Assembly (Electrical
Control Board)
1.
Unplug machine’s power cord.
2.
Remove six screws heatsink housing.
3.
Disconnect all leads from pressure control assem-
bly.
4.
Reassemble in reverse order.
Sensor
1.
Remove the four screws, heatsink, and lower the
pressure control assembly.
2.
Disconnect sensor lead from the board.
3.
Unscrew sensor by holding sensor with 3/4” wrench.
4.
Reassemble in reverse order.
Potentiometer
1.
Lower pressure control assembly as described
above.
2.
Disconnect potentiometer lead from pressure con-
trol assembly.
3.
Use a 1/16” allen wrench, loosen set screw in the
poteniometer knob and remove knob and spacer.
4.
Using a 1/2” wrench or deep socket, remove the nut
from the potentiometer shaft assembly.
5.
Pull entire potentiometer assembly out of the termi-
nal box.
6.
Replace in reverse order.
On-Off Toggle Switch
1.
Lower the pressure control assembly as described
above.
2.
Disconnect the two wires on the toggle switch.
3.
Use a 9/16” wrench to loosen the nut on the toggle
switch shaft.
4.
Reassemble in reverse order.
Liquid Crystal Display (LCD)
1.
Lower pressure control assembly as described
above.
2.
Unscrew the two nuts (M3) and remove LCD Display
assembly.
3.
If unable to loosen the two nuts, hold them and
unscrew the two screws. Then remove the LCD Dis-
play Assembly.
4.
Reassemble in reverse order, while making sure
that the two spacers and the two washers are in
place. Tighten the two nuts handtight and seal with
blue loctite.
Do not
overtighten the nuts as this will
damage the display.
Always unplug the electrical cord before servicing the
machine.
NOTICE
Unit will not operate if wires are disconnected or
pinched. Upon reassembly, ensure all wires are con-
nected and not pinched.
NOTICE
Unit will not operate if wires are disconnected or
pinched. Upon reassembly, ensure all wires are con-
nected and not pinched.
NOTICE
Unit will not operate if wires are disconnected or
pinched. Upon reassembly, ensure all wires are con-
nected and not pinched.
NOTICE
Unit will not operate if wires are disconnected or
pinched. Upon reassembly, ensure all wires are con-
nected and not pinched.
NOTICE
Unit will not operate if wires are disconnected or
pinched. Upon reassembly, ensure all wires are con-
nected and not pinched.
