Re: G05-802 focus issue

The last one I had with this type of problem was cleared up by using a
rejuvinator.

On Fri, Jul 23, 2010 at 9:22 AM, Darren Finck <dgfinck@yahoo.com> wrote:

> OK, I'm working on the G05-802 that came in my Battlezone. I have already:
> -resoldered cracked joint at header on EHT board
> -replaced a bad deflection amp xistor
> -replaced all of the electrolytics (except for the big 6800uF power filter
> caps) on both boards
> -replaced the big wacky diode on the EHT cage (D904, H1809?)
> -adjusted the HV to 12kV with no signal inputs
>
> Now it works more or less fine, except...
>
> I can't get it to focus well. I can adjust it from end to end, and there's
> an area in the middle where it's "best," but still nowhere near as sharp as
> the V2000 in my Asteroids. I've checked the focus voltage coming off the
> EHT board (pin 1, or 8, depending of which version of the schematics you're
> looking at) and it is varying from 0 to 370V as I turn the pot. The G2
> voltage is, of course, running about 370V.
>
> Does this sound like a worn-out cathode? Or a tired HV transformer? Or is
> there something else which might be preventing it from focus properly?
>
> Thanks,
> Darren
>
>
>
>
>
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Received on Fri Jul 23 10:26:57 2010