Re: Malfunctioning 5.25" drive: please assist

[dmanzer@wimsey.com (War Lib'y Canada)]

In article <50cup5$i12@zot.io.org>, crownmi@zot.io.org 
(Myles Fudge) wrote:

> It seems that the malfunctioning 
> drive is damaging the disk.

The symptoms you describe are the usual result of having
removed the disk controller card while power is on, which
shorts 12vdc across a 5v line, blowing the LS125 on the
disk analog board.

To repair it:

* Turn power off!

* Remove the cover of the disk drive

* Replace the 74LS125 in the circuit board on top
(make sure to observe where pin 1 of the chip is;
look for the notch at the end)

* Reassemble and try with a disk formatted in the
working machine.

Good luck!

Regards, Doug Manzer