Hofmann ATC 900 - Page 34

CTC-CEN Service Manual 07-13 Rev.E
34
 If it does not show that value replace the potentiometer.
 If the multimeter will display the correct value, check the extension cable from the connector X6 of the CPU
board.
 If also the cable extension will be fine, replace the CPU board.
TO REPLACE THE 3 TURNS POTENTIOMETER:
 Remove the potentiometer protection.
 Disconnect the potentiometer connector from the CPU board.
 Slide the arm at the more convenient end stroke.
 To slide the lower bead breaker arm press and hold SW1 or SW3
buttons on the CPU board.
 Unplug the potentiometer from the CPU board.
 Loosen the two screws with 5mm allen key.
 Loosen the nut and remove the toothed wheel.