Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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John T
 
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Default Cassette deck small problem

Greetings,

Well, recently I just got back my Denon DN-720R cassette deck from
repairs (new play/rec head, new pinch roller assembly and roller
itself). This deck had a problem with the speed varying - on some tapes
it would slow down and speed up, without the variable speed engaged. I
was told it may have been just a stretched tape, but the tapes it affect
play fine on my other machine, a Sony.

Checking out the problem on google, it would appear the cause of speed
variations are belts that have to be replaced. Is this right, and where
can I source belts these days for a cassette deck of this nature?

Thanks!


John
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Fred Besancon
 
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John T wrote:

Greetings,

Well, recently I just got back my Denon DN-720R cassette deck from
repairs (new play/rec head, new pinch roller assembly and roller
itself). This deck had a problem with the speed varying - on some
tapes it would slow down and speed up, without the variable speed
engaged. I was told it may have been just a stretched tape, but the
tapes it affect play fine on my other machine, a Sony.

Checking out the problem on google, it would appear the cause of speed
variations are belts that have to be replaced. Is this right, and
where can I source belts these days for a cassette deck of this nature?

Thanks!


John


You can get Denon parts at Pacific Parts: pacparts.com
Make sure your capstan(s) are moving freely: clean & oil and I hope your
capstan (main) motor is ok
Good luck............Fred
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Fred Besancon
 
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Fred Besancon wrote:

John T wrote:

Greetings,

Well, recently I just got back my Denon DN-720R cassette deck from
repairs (new play/rec head, new pinch roller assembly and roller
itself). This deck had a problem with the speed varying - on some
tapes it would slow down and speed up, without the variable speed
engaged. I was told it may have been just a stretched tape, but the
tapes it affect play fine on my other machine, a Sony.

Checking out the problem on google, it would appear the cause of
speed variations are belts that have to be replaced. Is this right,
and where can I source belts these days for a cassette deck of this
nature?

Thanks!


John



You can get Denon parts at Pacific Parts: pacparts.com
Make sure your capstan(s) are moving freely: clean & oil and I hope
your capstan (main) motor is ok
Good luck............Fred


John,
Here's the link to Pacific Coast Parts (not Pacific Parts):
http://www.pacparts.com/electronics/...TOKEN=28117000
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John T:
I think that you might be doing too much guessing here.
It is difficult for me to believe that any shop that would do a very
major repair job like replacing and aligning NEW R/P HEADS and
rollers..... would not check and/or replace the belts and check the
speed.... this could be considered part of aligning the new heads and
certainly part of replacing key parts like the pinch roller. There is
a lot of disassembly required to replace the belts and the obvious time
to do it is while replacing major parts like heads and rollers.
I would suggest that you check with the repair shop that "just" did the
repairs.... maybe they already checked or replaced the belts.... maybe
they would be glad to check the speed problem again for you....
especially since you "just" had it in their shop for a major and , no
doubt, expensive repair job....
I know that if my shop did that kind of very major work on a deck for
you that I would want to know if you were not happy and there was a
basic problem like speed variation.... I would guess that if the belts
and shaft bearings are OK that it might be a intermittent motor or
motor control problem. Take it back to the repair shop..... be sure to
bring along that "bad" tape so you can "show" them the problem.
electricitym
- - - - -


John T wrote:
Well, recently I just got back my Denon DN-720R cassette deck from
repairs (new play/rec head, new pinch roller assembly and roller
itself). This deck had a problem with the speed varying - on some tapes
it would slow down and speed up, without the variable speed engaged. I
was told it may have been just a stretched tape, but the tapes it affect
play fine on my other machine, a Sony.
Checking out the problem on google, it would appear the cause of speed
variations are belts that have to be replaced. Is this right, and where
can I source belts these days for a cassette deck of this nature?
John


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