Re: 1084S-D2 Monitor

["Michael J. Mahon" <mjmahon@aol.com>]

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

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