TECH: Dig Dug Resetting

My Dig Dug recently died, and is driving me crazy. It is a type B
board, and now displays static garbage on the screen with the reset
line on CPU #1 constantly cycling. No error messages are displayed.
I have swapped out the 3 CPUs, all roms and the custom chips (from my
spare Dig Dug board). I have also swapped all of the 74 series chips
from the watchdog, reset and CPU #1 circuits, with no change. I even
replaced the sockets on CPU #1 and the corresponding 08 custom.
Voltages are fine, both in the cab and my test bench.

Any ideas where to go from here?

Thanks!

-Paul

I don't have alot of experience with Dig Dug but my Crystal Castles had what
sounds like the same symptoms. The machine was in a constant reset. What I
found was the big blue cap was on it's way out. Changed the cap, no more
reset. Hope this helps.

Steve
--
www.atariswitch.com

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<pshaffel.RemoveThis@accesscable.net> wrote in message
news:1151341584.890809.202430@m73g2000cwd.googlegroups.com...
> My Dig Dug recently died, and is driving me crazy. It is a type B
> board, and now displays static garbage on the screen with the reset
> line on CPU #1 constantly cycling. No error messages are displayed.
> I have swapped out the 3 CPUs, all roms and the custom chips (from my
> spare Dig Dug board). I have also swapped all of the 74 series chips
> from the watchdog, reset and CPU #1 circuits, with no change. I even
> replaced the sockets on CPU #1 and the corresponding 08 custom.
> Voltages are fine, both in the cab and my test bench.
>
> Any ideas where to go from here?
>
> Thanks!
>
> -Paul
>