I just had a big problem also: the backup battery was 0 volts, the lathe KST21LS had sat idle for over 6 months. Replaced the battery and the
machine would not go into standby. It is totally different than the MR-J2-100a
that Mitsubishi sells and the manual parameters are totally different than
the MR-J2-100A-S01, and setting the tool 1 is a 7 button affair.
The dealers say that the unit is obsolete but here is one weather it works
or not: h ttp://www.plccenter.com/Buy/MITSUBISHI/MRJ2100AS01
repair: h ttp://www.hytechrepair.com/
Mitsubishi 520AL control
Unclamp: large select, feedhold, stop.
Clamp: buzz off.
T1 with estop pressed: small select, feedhold, stop. (X0030 will change)
buying the MR-J2S-100A will not work the MR-J2-100A-S01 is totally different software or firmware.
good luck you will need it.