Re: Video Height Adjustment

From: Blair Aakre <baakre_at_email.domain.hidden>
Date: Wed, 23 Apr 2008 21:56:46 -0500

I swapped out R21 (220K ohm) with a 330K ohm resistor and I am now able to adjust the video height to where it needs to be. Weird, maybe R22 really should be 200K.


On Apr 23, 2008, at 9:34 PM, Blair Aakre wrote:

> Hi,
> Just tonight I replaced the adjustment pots on the video board on a
> Lisa. However, now I am unable to get the height adjusted properly.
> With the Height POT adjusted as far counter-clockwise as it can go,
> the video appears stretched out vertically, off the top and bottom of
> the screen. I used a 100K ohm POT for R22. (The schematics on the
> internet list this as 200K, but the part I took off was 100K)
> Is there some sort of coarse height adjustment somewhere?
> Previously, the video worked OK, though it would lose vertical hold
> periodically.
> 5V is currently measuring 5.13V. I have "H" ROMs and the standard Lisa
> video ROM.
> Any ideas?
> -Blair
> >

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