Hofmann ATC 900, Service Manual

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CTC-CEN Service Manual 07-13 Rev.E
35
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Remove the threaded toothed wheel bushing.
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Remove the potentiometer from its holder.

Install the new potentiometer on its holder.

Mount the threaded toothed wheel bushing.
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Mount the toothed wheel and lock it with the nut.
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Turn the potentiometer manually at the end of its stroke and then make sure to turn the wheel back of a quarter
of a turn.
IMPORTANT!
MAKE SURE ABOUT THE POTENTIOMETER ROTATION DIRECTION BECAUSE A WRONG END STROKE
DIRECTION WILL CAUSE THE BREAKAGE OF THE POTETIOMETER WHEN WILL ROTATE.

Mount the potentiometer assy to the armr.
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Mark the toothed wheel.
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Slide the bead breaker arm all way in or out checking that the number of revolution made by wheel are 2 and
making sure that the potentiometer will not be at the end of the stroke
6.5 PROCEDURE TO ADJUST BEAD BREAKER DISKS ALIGNMENT
In case of complaints related to bead breaker disks misalignment out of the maximum tolerance allowed,
1mm/0,04”, we would like to inform you that it is now available the following procedure to correct the output analog
value of the potentiometer/s improving the bead breaker disks alignment accuracy.
PROCEDURE:
1. Fix to the multimeter terminals two small crocodiles style ones.
2. Remove the cover from the bead breaker arm potentiometer.
3. Select the multimeter in Vdc.