Replacement Of Electrical Components - Allpro 400E Operations Manual & Parts List

REPLACEMENT OF ELECTRICAL COMPONENTS

NOTE: Anytime the pressure control assembly, sensor or both are replaced, perform the three calibrations on page 14.
WARNING: Always unplug the electrical cord before servicing machine.
PRESSURE CONTROL ASSEMBLY (Electrical Control Board)
1. Unplug machine's power cord.
2. Remove four screws (Item 20, Fig. 17) from pressure control assembly.
3. Disconnect all leads from pressure control assembly. (Fig. 10).
4. Reassemble in reverse order.
SENSOR
1. Remove the screws (Item 20, Fig. 17) and lower the pressure control assembly.
2. Disconnect swivel (Item 13, Fig. 17) from sensor (Item 14, Fig. 17) by holding sensor with 7/8" wrench and
loosening swivel with 11/16" wrench.
3. Disconnect sensor lead from the board. Carefully pull sensor lead out of the terminal box and remove sensor.
4. Reassemble in reverse order.
POTENTIOMETER (Pressure Control Assembly)
1. Lower pressure control assembly as described above.
2. Disconnect potentiometer lead from pressure control assembly.
3. Use a 1/16" allen wrench, loosen set screw in the potentiometer knob (Item 11, Fig. 10) and remove knob and
spacer. (Item 13, Fig. 10).
4. Using a 1/2" wrench or deep socket, remove the nut from the potentiometer shaft assembly.
5. Pull entire potentiometer assembly out of terminal 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 switch.
3. Use a 9/16" wrench to loosen the nut on the toggle switch shaft.
4. Reassemble in reverse order.
FUSE HOLDER
1. Lower pressure control assembly as described above.
2. Disconnect the two wires on the holder.
3. Remove holder cover and fuse.
4. Use 11/16" wrench to remove the nut from the holder shaft.
17