Emax

>  
> The floppy drive on the Emax is allways lit no matter if the drive is used or not. It's function must be a kind of power indicator and not to tell that the drive is busy.

Not on mine, it's not.  Mine lights when the drive is being accessed
only.  If the LED is on all the time, it could mean that the drive is
faulty, or that the cable has been fitted upside down.  This would also
make it spin continuously.  Pin 1 is usually marked on the PCB, and on
disk drives is usually on the end of the big connector nearest the power
connector.  If the machine has been opened before, it's possible that
the connector has been reversed.  To get the Emax II rack apart, the
floppy cable needs to be disconnected because it's a little short (at
least on mine).

HTH
  Gordon.