MDS CDC Disk Drive Documentation - test-drb@ccmp.vtda.org

6 Jun 2005

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 From: "xyz" <rsnats at bellsouth.net>

Thanks Randy.

Themanual at the web site is for a 9404-B. It has a lot of helpful
information, but the printed circuit board is more modern.   I have traced
out some of the circuitry and it appears the even the pinouts from the 50
pin connector do not match those of the 9404-B.  That surprised me.

Bob 
Hi Bob
 I was just thinking. They used a lot of one-shots for
things like drive ready. I suspect that it has a one-shot
connected to the index detect. You might look at the index
signal to see if it look good and also check to see
if there are any of those axial lead tantalums next to
one-shot IC's. These old tantalums tend to fail over time.
Dwight