STRANGE VIDEO DRUM MOTOR PROBLEM

[b]

I have a late 1980s low end vcr (Sanwa - also badged Lögik, Orion,
possibly Saisho etc) with an unusual problem. It came to me 'dead' -
with the 1.25A fuse in the power supply open (not black).
I replaced it and the thing seemed to work but soon I noticed that
when you stop the tape, the thing unlaces as usual, but the drum motor
does not switch off - it spins very fast, sounding like it's
'hunting'. The power/stby switch does not react either. If you put it
into play when this hunting whine is going on, you get a distorted pic
which clearly shows the drum's going too fast. So far i've yanked the
plug to avoid further damage. Obviously this i pretty worthless, I'm
just curious to see if anyone else recalls this problem and what
causes it.

-B

 

[Bob Shuman]

I'm not familiar with your unit, but I'd guess that this might be caused by
a defective mode switch. If so, many can be removed, cleaned and
re-assembled.

Bob

"b" <reverend_rogers@yahoo.com> wrote in message
news:9a9a4253-1c89-4e4b-af05-e13a4599a8bb@k16g2000hsf.googlegroups.com...
I have a late 1980s low end vcr (Sanwa - also badged Lögik, Orion,
possibly Saisho etc) with an unusual problem. It came to me 'dead' -
with the 1.25A fuse in the power supply open (not black).
I replaced it and the thing seemed to work but soon I noticed that
when you stop the tape, the thing unlaces as usual, but the drum motor
does not switch off - it spins very fast, sounding like it's
'hunting'. The power/stby switch does not react either. If you put it
into play when this hunting whine is going on, you get a distorted pic
which clearly shows the drum's going too fast. So far i've yanked the
plug to avoid further damage. Obviously this i pretty worthless, I'm
just curious to see if anyone else recalls this problem and what
causes it.

-B

 

[Meat Plow]

On Wed, 22 Oct 2008 05:58:07 -0700 (PDT), b
<reverend_rogers@yahoo.com>wrote:

I have a late 1980s low end vcr (Sanwa - also badged L?gik, Orion,
possibly Saisho etc) with an unusual problem. It came to me 'dead' -
with the 1.25A fuse in the power supply open (not black).
I replaced it and the thing seemed to work but soon I noticed that
when you stop the tape, the thing unlaces as usual, but the drum motor
does not switch off - it spins very fast, sounding like it's
'hunting'. The power/stby switch does not react either. If you put it
into play when this hunting whine is going on, you get a distorted pic
which clearly shows the drum's going too fast. So far i've yanked the
plug to avoid further damage. Obviously this i pretty worthless, I'm
just curious to see if anyone else recalls this problem and what
causes it.

-B

Bad mode switch might explain the oddities except for the blown fuse.
I've replaced a butt load of mode switches once working for a
Goldstar/Tatung/Matsushita/Sanyo factory authorized warranty center
but don't recall a bad mode switch taking out a fuse.

 

[b]

On 22 oct, 18:39, Meat Plow <m...@petitmorte.net> wrote:

Bad mode switch might explain the oddities except for the blown fuse.
I've replaced a butt load of mode switches once working for a
Goldstar/Tatung/Matsushita/Sanyo factory authorized warranty center
but don't recall a bad mode switch taking out a fuse.

It's also possible the two things are unrelated - sometimes fuses just
go weak with age and a very small current hike can finish them off.
the drum thing is more unusual though.
-B

 

[Arfa Daily]

"b" <reverend_rogers@yahoo.com> wrote in message
news:8d8a47cf-cf06-4362-a1e4-07d15e7ada51@8g2000hse.googlegroups.com...

On 22 oct, 18:39, Meat Plow <m...@petitmorte.net> wrote:


Bad mode switch might explain the oddities except for the blown fuse.
I've replaced a butt load of mode switches once working for a
Goldstar/Tatung/Matsushita/Sanyo factory authorized warranty center
but don't recall a bad mode switch taking out a fuse.

It's also possible the two things are unrelated - sometimes fuses just
go weak with age and a very small current hike can finish them off.
the drum thing is more unusual though.
-B

Dirty rail from a bad ESR cap, maybe ? Might be worth just running an ESR
meter over all the ones in the PSU.

Arfa