On May 2, 1:51=A0pm, "Vaxx" <vax...@[EMAIL PROTECTED]
> wrote:
> off hand I would say one of the buffers near the video ram or somewhere
in=
> the scrolling circutry. Def be something on the video board tho.
>
> Have you changed the ribbon cables around and checked for bad solder
joint=
s
> on the interconnect sockets?
>
> "Nama" <forums6...@[EMAIL PROTECTED]
> wrote in message
>
>
news:99768832-6fd5-4f36-9781-2cd623e9f26c@[EMAIL PROTECTED]
> On Apr 28, 10:48 pm, "Andre" <rhomb...@[EMAIL PROTECTED]
> wrote:
>
>
>
> > I hate to tell you but these boards are cheap and not worth the time
to
> > fix.
> > I know that some people (including myself like to be able to fix
> > everything
> > but sometimes it's just easier to buy another one. With that said, to
fi=
x
> > a
> > CPU board you need to fallow some simple steps.
>
> > Here is a link of some more info (basic cpu repair
> > 101):http://www.arcadesolution.com/cpu101.html
>
> > --
> > thanks,
> > Andrewww.arcadesolution.com
>
> > "Nama" <forums6...@[EMAIL PROTECTED]
> wrote in message
>
>
>news:89ba8773-c84a-4bac-830d-38993951b91f@[EMAIL PROTECTED]
> > On Apr 28, 7:08 pm, Nama <forums6...@[EMAIL PROTECTED]
> wrote:
>
> > > On Apr 28, 12:17 pm, Cliffy <crin...@[EMAIL PROTECTED]
> wrote:
>
> > > > Nama wrote:
> > > > > As one of my many ongoing fix-it projects, my Williams Moon
Patrol=
> > > > > needs help and I have started a repair log here:
>
> > > > >http://web.mac.com/lord_philip/Arcade/Moon_Patrol.html
>
> > > > > I'm pretty sure no one will know what's exactly wrong with it
> > > > > (actually the way this group is going I'm probably not going to
ge=
t
> > > > > any replies at all, but I know there are still some very
> > > > > knowledgeable
> > > > > people lingering around), however I was hoping that someone
would
> > > > > give
> > > > > me some pointers on where to start looking. Usually the type of
> > > > > problem leads me in one direction, but in this case I'm not sure
> > > > > where
> > > > > to start looking. I have replaced the CPU, and re-seated all the
> > > > > socketed chips with no change. The board is being run from a
> > > > > Supergun
> > > > > with correct voltages and a correctly built JAMMA adaptor.
>
> > > > > Thanks in advance
>
> > > > > P
>
> > > > I would look at the rom sockets. Ohm each one out to a visible
trace=
> > > > and
> > > > see if you have continuity. Good luck!
> > > > --
> > > > Cliffy - CARGPB2
> > > > Home of the world's finest pinball
> > > > protectorshttp://www.passionforpinball.com
>
> > > Thanks Cliffy,
> > > I checked all the sockets for continuity. The board is very clean so
I=
> > > didn't expect any issues and didn't find any. What should I try
next?
> > > I have a logic probe, where should I start probing?
>
> > > P
>
> > Ok...played around with the board a little tonight. Very unscientific
> > I know, but I thought the inputs and outputs to the CPU looked weird
> > when testing with a logic probe, so I decided to ground some of the
> > outputs to see what would happen...anyway, lots happened!
>
> > Check out the log here
> > again:http://web.mac.com/lord_philip/Arcade/Moon_Patrol.html
>
> > Not sure what it means exactly, hoping someone else could chime in and
> > point me to the next thing to test.
>
> > Thanks
> > P
>
> Yes...I realize I could buy a working board for $50 (or less!), but
> what's the fun in that.
> There are two reasons why I enjoy this hobby, firstly I enjoy fixing
> the games, and secondly I enjoy playing, and having others play the
> games I fix.
> I intentionally buy game boards that do not work or are untested, they
> are cheaper that way too, and I write up all the fixes in repair logs
> so that it can hopefully benefit the community as a whole. I'm no
> electronics genius, but persistence, patience, research, and asking a
> lot of question usually pays off in the end ;-)
Thanks for the info.
I'm making progress, but it's slow. Replaced one RAM, and reburnt one
ROM. now I don't get any errors in test mode, but the board still has
issues.
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