Re: Asteroids Loud Buzzing

Robert Gonyer wrote:
>
> Hi everyone,
>
> My Asteroids restoration is 99% complete and it’s coming out great.
> One problem basically remains – there is a loud buzzing coming from
> the speaker during play. I can still hear the sounds underneath the
> buzz, but only faintly. The loud buzz does vary with the volume knob-
> If I turn it all the way down, it is gone. When I turn it up, the buzz
> is 10 times louder than the game. The monitor and AR have been capped,
> and I replaced big blue trying to get rid of the buzzing, and that
> didn’t help. Any other ideas off hand?
>
> I also need to get rid of the speed up mod, but I’m sure I can find
> that via search….
>
> Thanks for any help!!!
>
I had one board that had no "heartbeat" sound, and it turned out to be
C46 cap with a broken leg. Just guessing that if that cap, or whatever
the filter cap is in that same circut, was bad it may induce a buzz. If
you can have/can read the schems you should be able to track it down.
The board worked fine otherwise. And the speedup mod is usually a
clipped leg on an IC, like Alex says. The vectorlist.org archive knows
which chip it is. You could also make sure the crystal on the board is
11.96(?)Mhz. Or whatever the correct value is, I could be wrong on that.

-- 
Sean McLachlan
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com