Re: Need Help Adjusting IIgs AppleColor RGB

[Kevin Dady <kevin@hackaday.com>]

On Dec 5, 8:21 pm, dog_...@macgui.com (D Finnigan) wrote:
> The saga continues. Yay.
>
> I replaced a blown transistor with an ECG290 a few hours ago. This fixed the
> all-red screen problem. When I attached a IIgs, the screen looked fine,
> except that there was no red.
>
> I took the case off of the monitor to fiddle with the controls for R Drive,
> R Cut-Off, B Drive, B Cut-Off, and G Cut-Off.
>
> After an hour or so of fiddling, I came to this disturbing conclusion: there
> was no way to accurately "mix" the red into the blue and green levels.
> Either there was too much red (where black == red), or there was not enough
> red.
>
> So, I seek two things:
>
> 1.) A comprehensive guide to adjusting the color on the AppleColor RGB
> monitor.
>
> 2.) Advice on whether this color issue is from the new transistor, and
> whether I should replace more transistors for the other color circuits.
>
> --
> ]DF$
> Mac GUI Vault - A source for retro Apple II and
> Macintosh computing.http://macgui.com/vault/

are you positive the transistor is inserted correctly?