I have problem with an "oldie" 1985 Mazak QS20 Mazatrol T4 machine with a UF01A controller unit.
The machine had memory parity issues a few months ago, i was able to clear/reset the alarm after an bunch of repeats
then it worked well for about 4months...
I now have the NMI code 22 Memory Parity light on again, i clear the alarm according to "normal procedures".
All seem fine no alarm, then as soon as program simulate function is activated or the machine is started
in Auto it can run for a couple of seconds before i get the infamous code 22!
I have done this about 15-20 times, i'm loosing hope!
I have tried and changed the boards FX01B(CPU/memory controller board?) and FX27B(C-MOS ram-memory board)
with used boards from Ebay i had my hopes up.....tested and
same behaviour and alarm came back :-(
There is an additional ram/e-prom memory board called FX84A that holds the machine specific PLC ladder program, and
the NC "operating system", this one is the hardest to find as "spare part", i assume that i must find one from
an exact same type of machine...or am i missing something?
Any ideas or help would be greatly appreciated!
Regards
Torsten