Sony BM-23 portable dictator problem

J

jbclem

Guest
My BM-23 will PLAY a tape for a few seconds then stop. As it stops there is
a high pitched signal that will continue until I put it on STOP. Sometimes
it will stop playing and I can hear the motor spinning, and after five or
ten seconds the high pitched signal will come on. Sometimes it won't play
(the tape won't move) but I can always hear the motor spinning. Often, when
it won't PLAY at all, if I put it in rewind then release the slide, it will
play for the above mentioned 5-10 seconds before stopping and signalling.

At the same time I notice the LCD counter is blank, no readout at all. The
batteries check out with 1.28v in each. When I listen to the motor
spinning, it seems strong. I know nothing about this, but sounds like a
belt slipping, though I don't know if that would cause the LCD counter to
stay blank. (even when I can get it to play for 10 seconds, the counter
stays blank, no blinking, no flashing, no text.

If this is a belt, is it easy to disassemble this small dictator to replace
it? This is a real good dictator so I'd like to figure out how to fix it.

Can somneone give me advice on this...


Thanks, John
 
More on my Sony BM-23...I've just noticed that the cassette compartment lid
is not quite as flush as it could be when closed. If I hold it closed
tight, the tape counter will work and the tape will PLAY. I held it for a
few minutes and a tape kept playing until I loosened my grip. So that puts
a different spin on this problem. The top front (with the dictator standing
up) part of the lid is where there seems to be some looseness. With the lid
closed I can still push that edge down a small amount.

Is there a sensor switch, on that Top Front side, that has to be pushed in a
certain amount before the dictator will work? Also, there is a small screw
missing on the one side where the lid bracket connects to the lid, one or
four screws. Where would I go to buy such a small small screw?

John




"jbclem" <jbclem1@charter.net> wrote in message
news:i6uqgb$h3r$1@news.eternal-september.org...
My BM-23 will PLAY a tape for a few seconds then stop. As it stops there
is
a high pitched signal that will continue until I put it on STOP.
Sometimes
it will stop playing and I can hear the motor spinning, and after five or
ten seconds the high pitched signal will come on. Sometimes it won't play
(the tape won't move) but I can always hear the motor spinning. Often,
when
it won't PLAY at all, if I put it in rewind then release the slide, it
will
play for the above mentioned 5-10 seconds before stopping and signalling.

At the same time I notice the LCD counter is blank, no readout at all.
The
batteries check out with 1.28v in each. When I listen to the motor
spinning, it seems strong. I know nothing about this, but sounds like a
belt slipping, though I don't know if that would cause the LCD counter to
stay blank. (even when I can get it to play for 10 seconds, the counter
stays blank, no blinking, no flashing, no text.

If this is a belt, is it easy to disassemble this small dictator to
replace
it? This is a real good dictator so I'd like to figure out how to fix it.

Can somneone give me advice on this...


Thanks, John
Click to expand...
 
This is almost certainly caused by a failed auto-shutoff circuit.

The supply hub (I think) has a switch that periodically opens and closes a
circuit. When this cycle stops, the transport is shut off.

This happened to a Sony dictation machine I owned 25 years ago. (Gack!) The
switch was a pair of wires touching either side of the hub. They were
"opened" and "closed" by a metal bar running through the hub. When one of
the wires got mispositioned, the switch no longer worked. I tore into the
machine and repositioned the wire. A Sony tech told me he was surprised
someone without the proper equipment had been able to do it.
 
I should have read the second post more closely, as it definitely puts a
different spin <ar, ar> on things.

My initial reaction is that there's no point to an interlock, as the
auto-shutoff switch automatically serves that function -- without a tape in
the compartment, the supply hub won't turn and the machine will shut off
after a few seconds.

I would start by figuring out why the lid won't close fully, and solve
/that/ problem first. It might automatically solve the other. A careful
visual inspection of the guts might be all you need.
 
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