Hi,

The problem is not a belt slip issue in my model. I already said that
replacing the belts did not cure the problem, which included cleaning
the belt drive pulley at the motor, etc.

With a side panel removed, when this problem occurs, I place my
finger on the large pully/gear drive and rotate it in order to get
the stop mechanism to complete it's action. The amount of force I
need to apply is significant.

Since both sides have this same issue, I have to conclude this is
a faulty designed mechanism which is prone to have this problem
after the warranty runs out. This is when my problem started.

John


On Fri, 9 Dec 2011 16:18:50 -0800 (PST), in sci.electronics.repair you wrote:

On Dec 7, 1:59*pm, wrote:
Hi,
* * * I am a service technician for many years. *This Aiwa Z-L500 stereo is
my own.

* * * From time to time, I can not eject a cassette. *Both units (dual
cassette) have this issue. *I replaced the belts, but that did not solve this
problem.

* * * More often this occurs when you use FF or RW and the tape
reaches the end. *A solenoid (part of auto stop system) activates (click,
click, click), but the head assembly does not go down (disengage). *It remains
up in the cassette.

This is almost certainly the belts still. You probably need some which
are a bit shorter or a bit thicker.
Did you clean the motor pulley and capstan flywheel surfaces with
alcohol before fitting the new ones? This is essential to remove old
deposits and grease which cause slippage under load.

It could also be that the cam and its follower arm /associated
sliders, racks etc. have old grease on which has hardened and is
causing things to bind. Only cure is a full strip down, clean, and
regrease. However, this is not likely in a cassette deck like this.

In particular problem cases, I have found that roughening up the
plastic on the grooves where the belts go helps give it that bit more
grip.

HTH
regards
B.

wrote in message
...
Hi,

The problem is not a belt slip issue in my model. I already said that
replacing the belts did not cure the problem, which included cleaning
the belt drive pulley at the motor, etc.

With a side panel removed, when this problem occurs, I place my
finger on the large pully/gear drive and rotate it in order to get
the stop mechanism to complete it's action. The amount of force I
need to apply is significant.

Since both sides have this same issue, I have to conclude this is
a faulty designed mechanism which is prone to have this problem
after the warranty runs out. This is when my problem started.

John


On Fri, 9 Dec 2011 16:18:50 -0800 (PST), in sci.electronics.repair you
wrote:

On Dec 7, 1:59 pm, wrote:
Hi,
I am a service technician for many years. This Aiwa Z-L500 stereo
is
my own.

From time to time, I can not eject a cassette. Both units (dual
cassette) have this issue. I replaced the belts, but that did not solve
this
problem.

More often this occurs when you use FF or RW and the tape
reaches the end. A solenoid (part of auto stop system) activates
(click,
click, click), but the head assembly does not go down (disengage). It
remains
up in the cassette.

This is almost certainly the belts still. You probably need some which
are a bit shorter or a bit thicker.
Did you clean the motor pulley and capstan flywheel surfaces with
alcohol before fitting the new ones? This is essential to remove old
deposits and grease which cause slippage under load.

It could also be that the cam and its follower arm /associated
sliders, racks etc. have old grease on which has hardened and is
causing things to bind. Only cure is a full strip down, clean, and
regrease. However, this is not likely in a cassette deck like this.

In particular problem cases, I have found that roughening up the
plastic on the grooves where the belts go helps give it that bit more
grip.

HTH
regards
B.


Ah. OK. Well I guess my considerable experience in seeing all models of Aiwa
for the last 15 years or more, and never having seen a tape deck problem
that I would consider to be down to poor design, must count for little then.
For what it's worth, I would actually say that the Aiwa twin decks are
amongst the more reliable and better designed 'budget' ones. Did you use
manufacturer's original belts for your replacements ? When the deck grinds
to a halt, is the motor still running ? If the belts are really tight enough
as you suggest you believe, then if the cam gear is needing excess torque of
the level you are saying, I would expect this to stall the motor. At the end
of the day, the deck is easily removed, and easily cycled mechanically by
hand into any of its modes, if you properly understand its sequencing, and
know the right times in the cycle to flick the solenoid lever. If it truly
is jamming up, then the reason should be obvious to a skilled eye.

And if you wouldn't mind, please try to avoid top-posting in newsgroups. It
is generally considered to be bad practice, and plays havoc with the
thread's timeline ...

Arfa