On Jun 8, 7:25*am, wrote:
On Friday, June 8, 2012 6:43:13 AM UTC-4, William Sommerwerck wrote:
This is an almost-beltless transport (at least, as seen
from the top). The belt on the loading motor (?) seems
to slip when it's time for the capstan to start moving,
but moves at other times.

That is very likely due to the fact that it's stretched and
slick. That particular operation of the transport demands
the highest torque and therefore that's where it slips.
You can try cleaning the slick off with 99.0% isopropyl
or triclor (if you still have any).

I cleaned it yesterday, but there was no apparent change.

Sometimes giving whatever the belt is slipping on a little
push along when it starts to slip will definitely confirm this
diagnosis. Try to find a new belt just slightly smaller, (but
same thickness) than the one presently on the machine to
account for the increase in diameter. PRB used to be a good
supplier of belts. Don't know if they're still around.

I plan to search later today. If the belt is just a few bucks, why not give
it a shot?

I Googled PRB, but nothing appropriate came up.

Those were good machines. It would be a shame to let it go
for a relatively simple problem.

Agreed.

Belts should still be available. *I can look up the size later (I don't have the reference with me at the moment.) *MCM Electronics carries belts as one example. *If the capstan belt is slipping, that could account for the problem. *It may be the belt, or there are other problems like the power supply not providing power to the capstan motor.

Where are you located? *I have belts in stock and can send you one in the mail.

Dan

I also found this:
http://russellind.com/client/download/prb_line.pdf

Lenny