This is my first time out of lurk mode and above the parapet, so please forgive me if I'm not in the correct forum.

I'm trying to resurrect an old Chiron FZ12 circa 1979.

The maching has been switched off for over two years and refused to jog when I connected it last week.

When we got it first six years ago, the battery for the volatile memory had died so we replaced it and reloaded parameters and all was well.

This time, no such luck.

I'm going through the process in the Siemens manual to re-initialise a corrupt system. Stage 1:- clearing and reloading NC comm and PC comm seems to proceed OK but when I move to Stage 2:- Initialise NC shows a message "These functions require commissioning data to be set" and I'm screwed.

It appears to me that even though the first stage appears to complete OK, the data loaded must be corrupt. There are 12 Eproms in the controller on three daughter cards (which I have reseated). I suspect one of these has given up the ghost.

Anyone got any suggestions?

Philip.