Re: 1084S-D2 Monitor

[Drew <GoggleDrew@gmail.com>]

On 14 Oct, 23:26, "Michael J. Mahon" <mjma...@aol.com> wrote:
> Drew wrote:
> > On Oct 14, 10:06 pm, Alex Freed <alex_n...@mirrow.com> wrote:
> >> Drew wrote:
>
> >>> Well i connected the GS via the composite in and it only came up in
> >>> BW, so connected my xbox 360 and to be honest at first glance it look
> >>> ok, but then again it seemed a distinct lack of red in any of the
> >>> images
> >> If it is "black and WHITE" then red channel must be operational or it
> >> would be black and blue-green.
> >> There are generally  two separate controls for each color: black level
> >> and gain. Just like brightness and contrast per color. Chances are
> >> adjusting these controls should do the trick.
>
> >> And get color bars on the screen before attempting to adjust. If there
> >> is no other source, I guess "color test" from DOS 3.3 master should do.
>
> >> -Alex.
>
> > Cheers for the advice guys, was just using the control panel program
> > to check the colours and had another GS on with my Apple RGB monitor.
> > Only found one set of controls, labelled bias...would that be gain?
>
> "Bias" is equivalent to "brightness", "gain" would be equivalent to
> "contrast".
>
>  From your description, it sounds like the red channel gain needs to be
> turned up, or if it's up and insufficient, then a component in the red
> channel video amplifier is the likely cause.  Often the high-level part
> of the video amplifiers is on a PC board at the CRT socket (back of the
> neck).
>
> Low gain is often caused by imperfect contacts, loose connections,
> or open bypass capacitors in the (red, in this case) video amplifier
> circuit.
>
> -michael
>
> AppleCrate II: An Apple II "blade server"!
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>
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> - Show quoted text -

Hi,

If I turned the brightness down the red would pretty much disappear to
a dark blue/black. I will take the back off again tonight and have a
look for gain adjustment. Though its nice to have some red :-). Its
quite usable the way it is, but if i can make it better that would be
good.

Cheers
Dreew