Re: Tempest Display Problem (w/links)

So I did what you suggested, I digged into the analog area...

I set up the test screen to display only the rectangle and compared the y-signal of the right vertical line with the left vertical line on the scope. The ramp length of both lines was identical, but the voltage change rate on the ramp down was larger than on the ramp up. The BIP pots circuit seemed to be ok. Also the sample and hold looked good.

I then decided to replace the D/A converter which fixed the problem. I can now adjust the BIP easily with the y-pot only a little out of the center position.

Thank you for your help.

-Andreas

"Christopher X. Candreva" <chris@westnet.com> schrieb:
> On Mon, 29 Mar 2004, Andreas Kraemer wrote:
>
> > well, I wanted to say that ist is not a BIP _adjustment_ problem as I have
> > tried to adjust BIP by using the the crosshair test screen and I didn't
> > manage to get the horizontal lines to match. Best case is about 3/4"
> > vertical distance between the two horizontal lines, then the vert BIP pot
> > is at its end
>
> It's been my experience that analog problem are far more common than digital
> ones. Before looking into the state machine, I would check the whole analog
> system. It may be that the BIP adjustment just isn't working -- either the
> pot itself as someone said, or one of the parts in that area.
>
>
> ==========================================================
> Chris Candreva -- chris@westnet.com -- (914) 967-7816
> WestNet Internet Services of Westchester
> http://www.westnet.com/
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Received on Thu Apr 1 16:48:43 2004