Re: SCART leads

["Nick Long" <n.long@xxxxxxx>]

<<Do you have any sort of "Red Dot Remover" device
connected to the Digibox
that
repeatedly sends a "Backup" command to remove the red dot. ?It
could be that
this is causing a change to pin 8 momentarily giving rise to the effect
that
you are seeing. Is there a regular timing to the events?>>

This is one thing that never bothered me - why does that little red dot
infuriate people so much? i know people who refuse to watch certain
channels
until "backup" has been pressed!?

Now you're telling me that people actually automate to get rid of it? WOW!
It must be dead annoying!?

-Nick

----- Original Message -----
From: "Keith Doxey" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, January 04, 2004 1:14 PM
Subject: Re: [ukha_d] SCART leads


> Quoting tannedblondbloke <tannedblondbloke@xxxxxxx>:
>
> > Over the holidays I added some SCART leads to my sister's home
cinema
> > set-up.  Each box (digi, video and DVD) now has a SCART lead to
the
> > telly, and there is a SCART lead from digi to video.
> >
> > The TV has now started misbehaving.  Say you select the digibox
on
> > the telly.  That's fine for a few a minutes and it sudenly
switches
> > to video.  A few minutes later, it suddenly switches back to digi
> > again.  I think I read somewhere that it is down to one of the
pins
> > on the SCART - when it goes high, it forces the TV to select the
> > source corresponding to that SCART, and I guess the telly gets
> > confused if a high signal is present for multiple sources.
>
> SCART Switching is implemented differently by different manufacturers.
>
> Pin 8 is the pin used to grab control of the TV, some sets detect the
positive
> going edge of the signal to signify an active source, others detect
the
high
> level to signify an active source.
>
> Often there is a priority associated with the AV inputs, in the case
of my
TV,
> AV1 will always override any other source meaning that any changes on
AV2
will
> be ignored whilst AV1 is high. This in itself can lead to strange
effects
eg...
>
> Viewing normal TV - AV1 goes high - Set switches to AV1
> then AV2 goes high - ignored because AV1 is high.
> Then turn of source for AV1, set does not drop back to TV but now
senses
the
> AV2 input and switches to that.
>
> As I said, each manufacturer has a different way they prefer to do
things.
>
> What I dont understand is why your inputs keep changing. A VCR should
ONLY
take
> Pin 8 high when in playback mode or in the case of some VCR's when the
Menu is
> selected for programming ( because obviously you would want to see
what
you
> were doing!). Whilst on Record, Stop, FF, REW or Standby is should NOT
grab
> control.
>
> You dont say which inputs are connected to which source and it could
be a
> priority thing but I dont see why a VCR would keep grabbing control.
>
> One thing that springs to mind is something that used to happen with
my
analog
> satellite systems (PACE). Turning the Satellite on would correctly
grab
the TV
> but we didnt always want to watch it on the main TV so would press
BBC1
etc to
> return to normal viewing. We could than watch satellite in any other
room...
> BUT... IF we changed channel on the satellite it would DROP PIN 8 AND
RE-ASSERT
> ITSELF thereby grabbing the main TV again.
>
> Do you have any sort of "Red Dot Remover" device connected
to the Digibox
that
> repeatedly sends a "Backup" command to remove the red dot.
?It could be
that
> this is causing a change to pin 8 momentarily giving rise to the
effect
that
> you are seeing. Is there a regular timing to the events?
>
> >
> > As I see it there are potentially 3 solutions:
> >
> > The simplest, and what I have told them to do for now, is to make
> > sure that any boxes not being used are put into standby.  This is
not
> > a long term solution, as for example, this won't help if you want
to
> > watch one source and video another, as all 3 boxes would be on.
>
> Would be very helpful if you wanted to watch in another room either
:-(
>
> >
> > The ideal solution would be if there is a "soft" method
ie if there
> > is a menu option somewhere to disable this behaviour - I don't
think
> > the TV - a Sony - supports this, but I don't have the manual to
hand,
> > it's at my sister's.
>
> Difficult to say but highly unlikely. Depends on manufacturer.
>
> > This leaves a somewhat more drastic method - removing the
offending
> > pin from the SCART leads.  This raises some questions - which
pin?
> > Will it cause complications? And what physically is the best way
to
> > achieve this without damaging the rest of the lead?
> >
>
> Remove Pin 8 from the SCART lead. Looking from the pin side of the
plug
you
> will see a small tang that holds the pin in place. Gently depress this
and
you
> can push the pin back into the body of the plug, once removed from the
housing
> wrap it in insulating tape so that you can restore it to normal
operation
if
> required.
>
> http://www.diyha.co.uk/electronics/scart.html
for the pinout.
>
> Before you try that, see if choosing different AV inputs solves the
problem.
>
> Hope that helps.
>
> Keith
>
> www.diyha.co.uk
> www.kat5.tv
>
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