Re: Asteroids Deluxe weird problem

Steve C wrote:

>Hi, I have an Ast. Deluxe that works, but the brightness is all weird. If
>you turn the controls all the way down to where its a black screen, and
>then slowly turn the pot on the monitor up, the first thing that appears
>is the spot in the middle..
>
>If you keep ramping it up, the spot gets real bright, and the proper game
>vectors show up. The game vectors look great and stable, but that spot is
>there and cant be gotten rid of.
>
>Usually, on a properly working game, the first thing that appears when
>turning the brightness up is the game vectors.. then if you keep turning
>up the brightness, the spot and interconnecting vectors show up. Mine works
>the other way around!
>
>I know the problem is on the game board because I moved the game board to
>another game I have, a working Asteroids, and the problem showed up there
>as well. I also unplugged the Asteroids Deluxe monitor and plugged another
>working monitor into it, and the problem was on that 3rd monitor as well!
>
>Any ideas on that? The Z-Blank circuit maybe? I noticed that the output
>voltage seems to fluctuate some but seems to be pretty high, around 4
>volts or so.
>
>Regards,
>Steve Collet
>
>

Definitely the Z-output circuit. Best guess is an open Q3. If you have
a scope you can hunt it down pretty easily, but if all you have is an
ohmmeter I'd be checking Q3.

>
>

---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to vectorlist-owner@synthcom.com.
Received on Sun Mar 2 00:28:06 2003