N Cook wrote in message
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On 7 Mar, 08:32, "N Cook" wrote:
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bz ha escrito:
"N Cook" wrote in
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http://home.graffiti.net/diverse:graffiti.net/aiwa2.jpg
or
http://home.graffiti.net/diverse:graffiti.net/aiwa.htm

the extra bit is a tape guide for better tape path control.


What you have here is a single direction, 3 head tape deck. The
capstans should both go the same way. If not, you have a capstan
belt
on incorrectly. Try it.

absolutely, they must rotate same way


Surely you can't have 2 flywheels and 2 capstans with pinchwheels
engaging
the same tape, even if connected by the same rubber band.

Yes, thats how they work. The one on the left is driven by the one on
the right via a belt. Belts are a little lossy since they stretch at
one end more than the other, giving a slight speed difference when
free running. Put the tape in and this translates to putting tension
on the tape. Its a very effective method. Once you've had a deck like
this you wont want to go back to the cheaper more common system.


NT


I put the deck back in the chassis to check speed and record function.
If I had not been aware of the features before that i would certainly now
on
record.
It routinely uses playback at record as VU and PPM rather than direct from
source. So you set to record a signal and nothing appears on the VUs until
the tape has passed from leader to ferrite.
Nice to have big numbers etc on a proper large clear and bright cold
cathode
display.




Back to the original problem.
The belts had dropped off, obviously perished.
Now , sometimes, on using the power take off to slide up the head carrier
one of the belts drops off. The one that links the 2 flywheels directly
together. The first motor to flywheel belt stays on.
The second belt is driven by a flat pulley driving a vaguely bulbous pulley.
Belt dimensins of width and thickness are much the same as the originals but
obviously the length is less than the perished one - try a longer belt ?
There may be just enough room to add a disc of plastic to the flywheel to
stop it falling off or putting a static guard in place - any ideas?

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/