HP-85 belts/Capstan repair

From: Anthony Eros <Anthony.Eros_at_digital.com>
Date: Tue Mar 9 10:23:26 1999

Michael -

I was part of the HP-85 belt group buy (5 sets,) but I can't find your note
with the total owed and mailing address to send payment. Would you please
resend the info to me?

Thanks!

-- Tony Eros
   2105 Anson Road
   Wilmington, DE 19810

        -----Original Message-----
        From: Michael Grigoni [SMTP:msg_at_computerpro.com]
        Sent: Monday, March 08, 1999 3:46 PM
        To: Discussion re-collecting of classic computers
        Subject: HP-85 belts/Capstan repair

        Greetings to all:

        Since I've been absent for about a week, 800 messages have piled-up
        from the list; reviewing them will take awhile so I'm posting this
        to report on the HP-85 belt/capstan issues status globally.

        The belts have arrived and are being mailed-out early this week. I
        installed a set in our HP-85 and they work well.

        I tried a new approach to capstan repair which I find works very
well.
        Clean the capstan of old rubber down to a minimal amount of residue
        with isopropyl. Obtain a can of dipping vinyl (for coating tool
        handles, etc.); most hardware stores should have it. Remove the
        capstan/encoder wheel ass'y from the motor shaft. Prepare the
        vinyl properly according to directions with the product. Dip the
        capstan (inverted) at the rate of about 5 seconds for its length,
        being careful to just dip just above the bottom rim of the capstan
        wheel so that the vinyl creates an overlap of 90 degrees. Withdraw
        the part at the same rate as insertion. Immediately invert the
        part and place on a level surface in a warm place to dry for four
        hours. During the drying time you will note that any vertical
        asymmetry evens out. Repeat with another dip and 4 hour dry.

        The results were very good and tests with an old tape containing
        an 84 record program produced no errors (reading or writing).

        Attached is a small jpg which gives an idea of the appearance of the
        results (max mag. avail with the camera lens).

        Michael Grigoni
        Cybertheque Museum << File: CAPSTAN2.JPG >>
Received on Tue Mar 09 1999 - 10:23:26 GMT