Replace roller rubber on HP 9825 tape drive

Joe R. rigdonj at cfl.rr.com
Fri Jun 17 22:08:35 CDT 2005


At 04:32 AM 6/17/05 -0700, you wrote:
>
>I'm trying to repair the tape drive in an HP 9825.  The roller has melted
>(no surprise there).  It seems like I could just get a bit of silicon
>tubing or something that has the same diameter and guage as the existing
>roller.
>
>I know this has been discussed before but I can't find any specific
>messages (by the way, the CC archive search is broken, Jay).  Can anyone
>provide any tips or guidance so I don't have to re-learn mistakes already
>made?
>
>Any tips for cleaning off the existing material?  Isopropyl alcohol? 

  That's what I've used.


 Any
>thoughts of using heatshrink tubing and applying multiple layers until it
>has the same thickness as the original roller?

  There are two problems with HS. One is that it's usually been MOL
flattened and when you install it and shrink it in place the creases  will
always cause two ripples (yes, even if it wasn't squished completely flat).
Sometimes the reader will still read and other times it won't due to the
erratic speed. I used two layers of HS and staggered the creases 90d apart,
that helps minimize the problem.  The other problem is that the HS material
really isn't very good for a tape drive. It's too hard and doesn't have a
lot of traction and it also wears badly. I found the reader full of red
dust around only a few uses. I used red heat shrink, it seemed to work
better than the other types that I tried but YMMV. It works but it's far
from ideal. You have to be careful to shrink it evenly. It has a tendency
to do all the shrinking on the side nearest the heat source and that causes
one side to be thicker than the other. You have to shrink it slowly and
carefully and keep rotating it as you do. 

   If you try it let me know how it works for you.

    Joe

>
>Thanks for any help.  This will be a candidate for adding to the knowledge
>base once I've successfully replaced the roller.
>
>-- 
>
>Sellam Ismail                                        Vintage Computer
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