Re: Gravitar/Amplifone issue

Check the X and Y output voltages on the main CPU board. I forget the actual
specs but it should be a variable DC voltage on both of them. I think they
even swing from positive to negative at times. If it is stuck on a
particular voltage then you have issues in the X,Y output on the CPU board.
If not then I'd be looking at the Amplifone. If you get desperate send me
your boards and I can test them on my PAT 9000, no charge.

Mark Hooks
----- Original Message -----
From: "andre" <livnfree_can@yahoo.com>
To: <vectorlist@vectorlist.org>
Sent: Sunday, March 25, 2007 7:33 PM
Subject: VECTOR: Gravitar/Amplifone issue

> Swapped out the ram on my Gravitar board as it was
> giving 2 beeps on startup. Now I can coin up, hear the
> sounds for credits, and the player buttons flash. But
> I cannot start a game when I press the buttons.
>
> On the pcb all electrolytics have been replaced.
>
> On the Amplifone, a repair/cap kit was installed along
> with a new flyback. All I get on the screen is a very
> bright dot in the center (that I do not leave on for
> more than a second).
>
> I swapped in a Space Duel (unknown if it works) and
> bright dot came on, but every second or so there seems
> to be a sort of pulse and lightning sort of lines
> radiate out from the dot.
>
> The blue cap has been replaced and electrolytics on AR
> have been replaced...
>
> any ideas where to go from here?
>
>
>
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Received on Sun Mar 25 20:29:42 2007