I am working with a circa 1998 840D an a lathe.
At start up, the screen gets to "waiting for connection" and starts counting seconds.
From what I've read, I will have to reset the NCU because the parameters are lost or corrupt. This probably due to a dead backup battery.
First question, Is there "just" a battery available, rather than buying the fan/battery module that Siemens sells?
Second, Does anybody have experience reloading the data? I have the back up disk. It appears I have to reload via the RS-232 port on the front of the machine.