Re: G08 offset problem

Yes, it's +/- 9VDC. I will also presume you meant R711 and not R700? :)

I'll have to go back and check the 0V on pin 3 of the custom chip. I
have substituted another custom chip and get the same problem, so either
there is an inherent problem with the G08 deflection boards that cause
the custom IC600 chip to partially fail, or someone substituted a wrong
part someplace along the line.

I'll give it a test tonight. Thanks!

tm

Zonn wrote:
>
> Have you made sure you can achieve 0v on Pin3 of IC600? Somewhere during the
> adjustment of R712 the voltage on Pin3 should go from + to -. If this doesn't
> happen be sure there is +8 and -8 (or -9? it's hard to tell on my schematic) on
> both sides of R712. If this is good then R712, R700 or R710 could be at fault.
> If the voltages are off, you'll have to trace them back.
>
> But I don't know what you've already tried.
>
> -Zonn
>
> On Thu, 26 Jun 2003 14:30:59 -0500, Tom McClintock <tomm@mgcap.com> wrote:
>
> >Sadly, I'm still having a problem with a G08 deflection board.
> >
> >The image on-screen will not 'center' and is not adjustable more than
> >3/4ths of the way across the screen.
> >
> >Here are some screen shots:
> >http://www.ionpool.net/g08_1.jpg
> >http://www.ionpool.net/g08_2.jpg
> >
> >The tube, yoke, HV and deflection transistors are all known good as I
> >can swap in a good deflection board and all works. I'm currently using
> >an input signal from a Wico pattern generator so that is not an issue
> >either. I've had some really good advice thus far, but still no love.
> >
> >Suggestions?
> >
> >
> >
> >tom
> >
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Received on Thu Jun 26 17:21:45 2003