1 Mar
1999
1 Mar
'99
2:04 a.m.
Andrew,
It's not silicone, it's some type of polyurathane. Yes, they do turn to
goo. They can be fixed, I've fixed hundreds of them. But it's not as easy
as it sounds, there's a lot of specail techniques involved. You need six
hands just getting the HP 41 card reader back together again.
Joe
At 12:43 AM 3/2/99 +1100, you wrote:
My understanding is that in the case of HP card
readers, there is a small
silicone roller/wheel, which oxidises. Can anyone confirm oxidised silicone
is "gooey" :) ? In any case, the roller can be replaced by a piece of
appropriateley sized nylon tubing cut to size. I just so happen to have
about 1m length of this tubing, which I will happily share out pieces of to
those in need, for the cost of postage.
Cheers
A
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-----Original Message-----
From: CLASSICCMP-owner(a)u.washington.edu
[mailto:CLASSICCMP-owner@u.washington.edu]On Behalf Of Joe
Sent: Monday, March 01, 1999 8:09 PM
To: Discussion re-collecting of classic computers
Subject: Re: Gooey rubber bits
At 08:13 PM 3/1/99 +1100, you wrote:
Marvin wrote with respect to a HP85:
like
this.
print each iteration of the program. The tape
drive roller is gooey
although it is still round at this point :).
I've often see rubber items on old printers and stuff go "gooey" Does anyone understand why this happens and
whether it is reversible?
Sometimes in 2 different examples of the same machine, one has
the problem
and the other hasn't.
Hans,
I don't know what causes the "rubber" to turn gooy but I know
it's common
for the drive wheels in ALL of the HP tapes and mag card drives to turn
gooy with age. I took a HP 7912 tape drive apart last week and
the "rubber"
had liquified and actually dripped into the other parts of the tape drive
sort of like paint. The HP-85 belts are made of a different
material, they
don't turn gooy but just fall apart with age.
My $.02 worth,
Joe