Re: Disk ][ Drives not working

[Jeff Blakeney <CUTjblakeney@sympatico.ca>]

On Fri, 02 Jul 2004 15:51:50 GMT, "John B. Matthews"
<nospam@nospam.com> wrote:

>This is an excellent picture of a well-known way to fry the 
>analog card inside the drive. I seem to recall folks saying it 
>blew the "read sense amplifier" chip, luridly recounting how it 
>would smoke and be visibly burned afterward. Is that the 
>"ULN2003" you mention?

I once plugged a Disk ][ onto my controller card but I think I had the
pins off by one to the right or left, not missing an entire row like
Bill mentioned, and I literally blew a large hole out of the top of a
74LS125 (I think that was the chip) in the Disk ][.  I was unable to
fix it myself (I did try) and paid to get it repaired at an Apple
dealer and within a week or two the drive motor died and the dealer
replaced the drive with no charge after that.

I'm pretty sure the first repair was to simply replace the analog card
and the second was probably to replace most, if not all, of the parts
in the drive.  :-)

-- 
 Jeff Blakeney - Dean of the Apple II University in the
                 Apple II Community on Syndicomm.com
 CUT the obvious from my address if you want to e-mail me