Floppy drive on K2500R mounting problems

Hello Roger,

I’m sorry to bother you but I’m turning to you for your advice. I will try to make this as succinct as possible. I have a second K2500R with a floppy drive that will not mount. Here are the facts.


  1.  The drives power supply was connected to the HDD power connection thus it was getting 12v DC instead of 5v DC.
  2.  I reconnected the power supply to the FDD connector. On power up an IC on the floppy drives integrated PCB blew.
  3.  I replaced the drive with a new floppy which I confirmed was good by mounting in my main K2500R.
  4.  The drive will not mount and fails both drive tests in diagnostics.
  5.  I swapped all cabling from my other unit and still it would not mount.
  6.  This leaves me to believe the FDD controller chip is toast.
My question is have you ever encountered this before? If I replace the FDD controller chip should that cure the problem?  Are there any other components that might need to be replaced in order to get this floppy to mount?

I have done hard resets and I even reinstalled the operating system. There are no jumpers on the floppy drive so I guess the drive allocation is predetermined in the OS.

One more question for the expert. Can I use an engine board from a keyboard unit in a rack unit. It appears that the engine and daughter board are the same as those used in the keyboard vs the rack. I see that the rack unit has a location of L2 which is not used on the keyboard unit.
Thanks,

Richard