Tom's Hardware: Topic TECH: Galaxian board issues
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Archived from groups: rec.games.video.arcade.collecting (More info?)
On 6 Jul 2005 09:14:53 -0700, "Corey C." <cooke@jory.ca> wrote:
>All,
>Sorry if this topic has been breached before. I've been looking over
>documents and this group, but I'm a newb at board repairs, and figured
>I might find the information in terms I can understand faster if I just
>start a new thread.
>
>I have a Galaxian board that I'm having problems with. Firstly, it's
>actually a Super Galaxians board "by Silver Systems" according to the
>title screen. That's not my problem. The problem is that any swooping
>attacker appears as four numbers, like this:
>
>20
>31
Try looking at the outputs of the 74LS139 at location 4C. If they're
okay then grab the schematics from, say, crazykong.com and work
forward from the 74LS139. If the outputs are bad but the inputs are
good then that chip could be faulty. If the outputs are bad AND the
inputs are bad then work backwards from that chip using the schematics
for reference.
Have fun. 
Archived from groups: rec.games.video.arcade.collecting (More info?)
bad roms /sockets (likely)/ broken bent rusty legs on the gfx proms 1K 1H
"max-man" <max-man@hotmail.com> wrote in message
news:42ccdcda.222230125@news.freeserve.net...
> On 6 Jul 2005 09:14:53 -0700, "Corey C." <cooke@jory.ca> wrote:
>
> >All,
> >Sorry if this topic has been breached before. I've been looking over
> >documents and this group, but I'm a newb at board repairs, and figured
> >I might find the information in terms I can understand faster if I just
> >start a new thread.
> >
> >I have a Galaxian board that I'm having problems with. Firstly, it's
> >actually a Super Galaxians board "by Silver Systems" according to the
> >title screen. That's not my problem. The problem is that any swooping
> >attacker appears as four numbers, like this:
> >
> >20
> >31
>
> Try looking at the outputs of the 74LS139 at location 4C. If they're
> okay then grab the schematics from, say, crazykong.com and work
> forward from the 74LS139. If the outputs are bad but the inputs are
> good then that chip could be faulty. If the outputs are bad AND the
> inputs are bad then work backwards from that chip using the schematics
> for reference.
>
> Have fun.
>
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