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Amada Fo M114222 NT Height sensor issue

Amada Fo M114222 NT Height sensor issue

Amada Fo M114222 NT Height sensor issue

Hi all first post on the forum, hopping someone could help me out.
I believe there are some very clever laser techs on this forum.
Our Amada has developed a problem what looks like other people have had over the years.
calibration of the height sensor failing.
I can run the machine on standard nozzles ok and set the machine to do a clean on the start of a program.
the machine can height sense on the nozzle changer but that's it.
if i try to do a calibration on the workpiece it just fails.
I have had amada look at it, changing the HS board out and preamplifier, testing the coax cord to no benefit.
also rebuilding the cutting head to factory spec regarding impedance.
I am thinking it might be a parameter thing.
I have also noticed setting the height to standard in cut conditions = heigh, mid =lower , heigh = low.
seams to be in reverse.
Where should I start? any help would be appreciated.

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