Re: G08 width and centering problem

I had the same exact problem (potentially), and never could figure out a
solution. The linked photos in my post below are nowhere to be found
either, but I suspect you know what it looks like. I finally gave up on
that deflection board if I recall.

http://www.vectorlist.org/Vectorlist/2003/06/0070.html

tm

On 4/29/2011 3:38 PM, kstillinger@sc.rr.com wrote:
> Hey-
>
> I've been looking at a G08 here for a few weeks now on and off. Everything else finally fine, the width is not sufficient to fill the screen and the centering is off.
> I've tried a bunch of different stuff and replaced parts for other issues along the way.
> The 'left' side of the image won't reach all the way over. Messing with the horizontal width and centering pots can only get it about halfway from center to the side. The problem persists with different input protection boards and output transistor assemblies. I replaced Q704 MPSU60 with a recommended equivalent (MPSW92) and first thought the problem was due to a mismatch with the old Q703 (MPSU10) so I subbed the recommended MPSW42. No change.
> Both X and Y signals look nicely centered around 0V, so that's not where the offset is coming from. Twisting the Horz centering pot to each side seems to affect the right side more than the left. I can actually get the right side shifted off to where it is clipped. Even the Hwidth pot seems to affect the right much more than the left.
>
> I thought the horizontal side R735 3 ohm 20W measured too low around .8 ohms and I thought- that could do it. Shoot no.
>
> I figure I might try to swap the X and Y paddle boards and see if the problem follows the board.
> This is really bugging me. I can't see where the problem is being introduced.
>
> Any ideas are appreciated.
> Kerry
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Received on Fri Apr 29 17:02:32 2011