Sony Betamax VCR Model SL-HF360 pulse or "click" in the HI-F

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I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal
and the video tracking and picture are fine.

Sounds like something is not being filtered out of the HI-FI circuit but not
shure what.

Any help would be appreciated
 
<estate25@gmail.com> wrote in message
news:1219115601_12774@news.newsgroups.com...
I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal
and the video tracking and picture are fine.

Sounds like something is not being filtered out of the HI-FI circuit but
not
shure what.

Any help would be appreciated
Click to expand...
sounds to me like it's fucked up.
 
<estate25@gmail.com> wrote in message
news:1219115601_12774@news.newsgroups.com...
I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal
and the video tracking and picture are fine.

Sounds like something is not being filtered out of the HI-FI circuit but
not
shure what.

Any help would be appreciated
Click to expand...

Clean the pinch roller, may have a particle of magnetic material on it if
"recorded" on tape (try on another machine)

Is it exaxtly the same click rate at any point in a tape?

Does it change periodicity if you slightly brake capstan motor (more likely)
or drum motor with a finger? ie a problem on a commutator contact.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
Thanks for the responses.
The pinch roller was cleaned and it is not
worn or slick.
The click is constant on all tapes at the same rate.
If I slow down the drum or capstan motor nothing
changes until the motors are slowed down
to the point the video starts to drop out. Then the HI-FI
drops out also so I can't tell.
I was leaning to a ground problem also as the problem
showed up after a move from one city to another.
Have looked for loose parts and cracked etches.
Could very well be interference from the power supply.
Found nothing so far.
I will keep looking.
Thanks!
 
Not all that familiar with Beta machines, but I assume the Hi-Fi
audio is taken from a set of the rotating heads on the drum similar
to the way it is done in a VHS HiFi machine.
Click to expand...
Nope. Beta HiFi didn't require extra heads. (If I'm wrong about this, my
face will be deeply red -- though you won't be able to see it.)
 
estate25@gmail.com wrote:
I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal
and the video tracking and picture are fine.

Sounds like something is not being filtered out of the HI-FI circuit but not
shure what.

Any help would be appreciated
Click to expand...

Hello,

While I don't know your model, we once had a Betamax at the shot with
an audio problem like this that turned out to be a ground shield that
was not mounted properly when the owner cleaned the heads. I'd make
sure all shields are in place, along with ground straps, as Sony
intended them. Our guess was that the switch mode supply was
interfering with the audio board.

Regards,
Tim Schwartz
Bristol Electronics
 
Not all that familiar with Beta machines, but I assume the Hi-Fi audio
is taken from a set of the rotating heads on the drum similar to the way it
is done in a VHS HiFi machine. If so, it sounds to me like you're hearing
the dropout where the heads are switched. Most VHS machines had an
adjustment for this to switch the heads on-and-off so there was a slight
overlap. Hopefully you have the factory service manual and an oscilloscope.
Look at the Hi-fi FM envelope on the 'scope (and see if there is a small
void in it) and adjust the Hi-Fi switch point according to the spec's listed
in the manual. Note this will be seperate from the video switch point, but
while you're at it, check (and if necessary adjust...) the video first (as
the manual no doubt will specify). The Servo system tells the head amp when
to switch heads by comparing this adjustment with a pulse from a sensor on
the drum, called PG (Pulse Generator). Many times the service manual refers
to this adjustment as "PG Shift" , and on HiFi machines, there are TWO PG
shift adjustments, one for the video, and one for the HiFi audio. Keep in
mind, the heads could be worn, or something wrong with the tape path that
could be causing your problem, in which case adjustment may be futile.


<estate25@gmail.com> wrote in message
news:1219115601_12774@news.newsgroups.com...
I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal
and the video tracking and picture are fine.

Sounds like something is not being filtered out of the HI-FI circuit but
not
shure what.

Any help would be appreciated
Click to expand...
 
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