Huntleigh Flowtron AC550, Service Manual

Page: 31 / 42

5 SERVICING THE PUMP
5.1 Replacing the Main Printed Circuit Board
1. Remove the two screws located towards the rear of the PCB.
2. Unclip the three electric connectors located at the rear left hand side of
the board.
3. Remove the PCB by sliding it backwards.
4. Disconnect the buzzer electrical connection located at the right hand
side of the PCB. (CON 1)
5. Disconnect the pressure sensing tubing.
Replacement is reverse of above procedure.
NB. Ensure the pressure sensing tubing and buzzer connector are reattached.
5.2 Replacing the Motor/Gear Box Assembly
This is a sealed unit which cannot be repaired and must be replaced if faulty.
1. Remove the main PCB as previously described.
2. Unscrew the 2 nylon pillars.
3. Disconnect all tubing attached to the assembly.
4. Cut the small cable securing tie wrap.
5. Disconnect electrical connections from the terminal block.
Replacement is reverse of above procedure.
When reconnecting tubes to the assembly, ensure there are no kinks and the
tubes are pushed fully onto their mounts.
NB. When replacing the motor/gear box assembly, it is advisable to replace the
rotor/stator assembly.
5.3 Replacement of Front Panel Assembly
Remove the two securing screws and lift away.
Replacement is reverse of above procedure.
247901 5-1 Issue 1
March 1998