[Coco] Yellow tinge

[Zippster]

Carlos,

That’s a fairly common issue with CoCo2’s.  There is an issue with the artifacting circuit,
and will affect both RF modulator output as well as composite mods.

The capacitor fix detailed on that page is a “quick fix” but after fixing several of these, I tend
to think it’s usually something that degrades in the 555 timer chip itself over time.  

I’d replace that first.

- Ed


> On Sep 13, 2017, at 6:41 AM, Paul Shoemaker <paulfe3 at swbell.net> wrote:
> 
> Hi Carlos,
> Ed explains that on his page here:
> https://sites.google.com/site/thezippsterzone/home/coco2-projects/vertical-yellow-bar-fix
> 
> -Paul
>      From: Carlos Camacho <idevgames at gmail.com>
> To: coco at maltedmedia.com 
> Sent: Wednesday, September 13, 2017 6:06 AM
> Subject: [Coco] Yellow tinge
> 
> I have two CoCo 2 for sale on eBay and a customer pointed out one of them
> has a yellow tinge running vertically on the left side. You can't see it on
> the BASIC screen. You can see it with a white background screen like Canyon
> Climber. I recall some video composite boards have this issue, but haven't
> heard of it with regular RF out. It's not the monitor as my other CoCo for
> sale doesn't have it.
> 
> So what is the yellow bar and how to remove it?
> 
> Thanks,
> 
> Carlos
> 
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