Re: Space Duel Problems - Anyone know the "Next Step"?

As far as SENSE going nuts and cranking up the +5, I'd suggest jumpering
your AR/2 as Andy (P-man) recommends. If memory serves correct on J7 you
jumper pins 1-2 and 3-6 together on the back of the board, then adjust +5
via the on-board pot. You may want to check his document on this; I'm sure
it's in the vectorlist archives several times now. If you can't find it let
me know as I do have a copy of it on my home PC.

Whether this is the cause of dead AVG's, it sounds plausible but I doubt it.
I've had machines that were rock-solid otherwise just pop and die. I think
they're just crappy chips : )

Richard

----- Original Message -----
From: "Curtis H. Wilbar Jr." <vector@hawkmountain.net>
To: <vectorlist@synthcom.com>
Sent: Sunday, December 15, 2002 11:39 PM
Subject: Re: VECTOR: Space Duel Problems - Anyone know the "Next Step"?

>
> My big question is what would kill these ?
>
> I too have a Space Duel that the AVG died in... I replaced it, probably
> haven't put more than 5-6 hours of use on it, and it is dead again, and
> I'm again suspecting the AVG.
>
> One thing I plan to do (my one theory) is that due to not so hot
connections
> on the edge connector to the mainboard (which I have to redo... they are
> not very tight) causes the +5V and GND returns resistance to rise, causing
> the AR to kick up the voltage when it really hadn't dropped, and
overpowering
> the logic board, and maybe the AVG is particularly sensitive to that....
>
> I'm not happy that I'm down another AVG chip.... arg !
>
> Is this the most likely culprit ?
>
> -- Curt
>
> >Date: Sun, 15 Dec 2002 23:09:59 -0500
> >From: Al Warner <alsarcade@comcast.net>
> >Subject: Re: VECTOR: Space Duel Problems - Anyone know the "Next Step"?
> >To: vectorlist@synthcom.com
> >MIME-version: 1.0
> >Content-transfer-encoding: 7BIT
> >X-Accept-Language: en
> >
> >Incidental note...
> >
> >The machine died after running for an hour. I have ordered one of
> >Clay's replacement boards.
> >
> >Happy Holidays everyone!
> >
> >Al
> >
> >Al Warner wrote:
> >>
> >> Hi Everyone!
> >>
> >> Well, that was it, the AVG (137179) was bad. I swapped the AVG between
> >> my boards and got similar results.
> >>
> >> I went looking for a new one on the net and found out just how valuable
> >> these are. I did see that Clay has a replacement for $35.00 (+
> >> Shipping), but he's in the Christmas rush for shipping. I borrowed one
> >> from a dead Star Wars set I've been saving and the game came right up!
> >> The monitor has a nice picture too!
> >>
> >> Seeing how valuable they are, does anyone have a couple of spares they
> >> would sell me at a decent price?
> >>
> >> Thanks for the pointers!
> >>
> >> -Al-
> >>
> >> someotherguy wrote:
> >> >
> >> > I have no idea what would cause that particular symptom...but I can
give
> you
> >> > a suggestion on the other "more dead" board. Try replacing the AVG
chip
> >> > with a known good one. Every Space Duel, Gravitar, and Black Widow
PCB
> I've
> >> > had that was *totally* dead, the AVG was bad.
> >> >
> >> > Richard
> >> >
> >> > -----Original Message-----
> >> > From: owner-vectorlist@synthcom.com
> >> > [mailto:owner-vectorlist@synthcom.com]On Behalf Of Al Warner
> >> > Sent: Saturday, December 14, 2002 11:33 AM
> >> > To: vectorlist@synthcom.com
> >> > Subject: VECTOR: Space Duel Problems - Anyone know the "Next Step"?
> >> >
> >> > Hi Everyone,
> >> >
> >> > I got a nice Space Duel but it has problems. When I turn it on in
self
> >> > test mode, it does nothing. After a minute or so, this appears on
the
> >> > screen:
> >> >
> >> > http://mywebpages.comcast.net/al-warner/pics/DSC00016.JPG (Ignore the
> >> > red light on the side, it's a reflection from my camera).
> >> >
> >> > I have already swapped out the ROMs, Replaced two RAM chips, and
swapped
> >> > out the Pokeys.
> >> >
> >> > If I switch it to game mode, I get some random Space Duel stuff on
the
> >> > screen, but it will not coin up and play. I have two PCBs - the
other
> >> > one is more dead.
> >> >
> >> > Any suggestions would be appreciated.
> >> >
> >> > Thanks,
> >> >
> >> > Al
> >>
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