We have problems with our "oldie", a Mazak Slent Turn 15 Universal 1000 with Mazatrol T1'. Maybe somebody here can help?

When turning it on the relay QF is turned on which results in the quilt sleeve moving forward which in turn results in an emergency stop (f28 alarm code). This happens every time. The error has first ocured after we have had the PCBs repaired by Mitsubishi Electric. The problem did not occur before that repair (but other problems did which noiw appear to be fixed).

Mazak and Mitsubishi are not of great help in finding the cause.

We suspect that the parameters might be messed up (battery). But entering the factory defaults has not changed anything. is it possible that we are missing some "secret" manufacturer parameters (namely the OP ones?) that are not in the documentation we have?

We have the following:
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- Mazatrol T1/T1' operating manual
- MAZATROL T1, T1' INTERFACE DIAGNOSIS TROUBLESHOOTING MANUAL. The charts in its appendixes (A-D) match other machines that we
have: The Quick Turn 10N and 20N. We do not have that particular document with the appropriate info for the Slant Turn 15 Universal 1000.

What would help us solving the problem:
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- I/O address chart
- Parameter Explanations
- Alarms and Trouble Shooting Guide

All for the slant turn 15 universal.

Does anybody have access to that kind of info or an idea what could be wrong or what could be done to investigate?

Best from a newbie in this forum,

Thomas