help! shugart 801

From: Joe <rigdonj_at_cfl.rr.com>
Date: Wed Jul 23 15:11:45 2003

At 08:03 PM 7/22/03 -0700, you wrote:
>Did you check the drives opto sensor's light path to
>make sure that no dust bunnies are blocking the path?

   No I have to check that and some other signals. I didn't have a logic
probe or scope with me when I was working on them so I need to do some
basic checks.

>
>i have an osi/macom that uses the same drives and
>after troubleshooting three good drives - i discovered
>that the drive interface card and 1 cpu had been
>pluged into the molex plug backplane backwords!
>
>one of these days i'll have to re chip and re cap both
>boards.

    Ouch! Been there, done that :-(

>
>anyhoo, you may want to check out your controller to
>insure that it is sending a head load signal.

    It is. I swapped in a 800-1 drive and it works fine so the cables and
system are working.


>
>also on those drives,there are some wire jumpers that
>may need to be set and soldered.

    Done that. I've checked, re-checked and triple checked the jumpers, etc.

>
>if i remember correctly - there is two different
>boards used on those drives too - one is for hard
>sectored and one is for soft sectored thier may be
>another for mfm vs another standard too - double check
>the boards on the drive's with your orignal - your
>looking for the missing or complete parts on the fm
>data sep and other silk screened areas and the wire
>jumper location's at the back of the card edge
>connector.

     Yes, the boards are different. The 800-1 has three power transistors
on the board but the 801 doesn't. My docs show BTH drives having the
transistors but none of these do.

>
>just rememebered my drives were siemens fdd 100-8 e
>hope this helps anyway.

    Thanks for the suggestions. BTW do you have any doc for the Siemans
drives? A friend of mine just bought a couple of them. They were sold to
him as Shugart drives but they weren't. Now he's trying to figure out how
to use them in place of Shugarts.

     Joe
>
>Bill
>
>
>Message: 31
>Date: Mon, 21 Jul 2003 21:40:07
>To: cctalk_at_classiccmp.org
>From: Joe <rigdonj_at_cfl.rr.com>
>Subject: help! shugart 801
>Cc: Dave Mabry <dmabry_at_mich.com>
>Reply-To: cctech_at_classiccmp.org
>
> I have several systems that use Shugart 800-1 SS
>8" disk drives.
>I've
>got several defective drives plus I've been wanting
>some spares. Last
>week
>I picked up 10 Shugart model 801 SS drives. Today I
>tried to use them
>on
>the same systems but I can't make them work. I've set
>all the jumpers
>and
>straps exactly the same as in the 800-1 drives but the
>801s aren't
>working.
>The system knows the drive is there and detects the
>disk being in place
>and
>rotating and that the drive door closed but the drive
>never gets the
>head
>load signal. I'm using the same system, cables, power
>supply, etc with
>both
>drives so the only difference is the drives
>themselves. I've tried a
>couple
>of 801s and gotten exactly the same results with all
>of them so I don't
>think that it due to a drive failure. Anybody have any
>experience with
>these or have a good idea of what's wrong?
>
> Joe
>
>--__--__--
Received on Wed Jul 23 2003 - 15:11:45 BST