(Topic ID: 231367)

Williams System 6 Firepower won't boot

By rlbohon3

2 years ago

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  • 32 posts
  • 13 Pinsiders participating
  • Latest reply 6 months ago by Brewchap
  • Topic is favorited by 7 Pinsiders


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#4 2 years ago

Try removing the driver board completely, then power on. This will let you know if there's something on the driver board mucking things up or not.
I just went through some problems on my firepower, and it ended up being a bad PIA (or two) on the driver board that was keeping the CPU from booting properly.
I'm starting to think that PIAs should've been named PITAs.

Good collection of Firepower info here (not sure why it's called "blackknightpinball" when it's really firepower):
specifically in the margins here:

Helped me out a LOT.

Good luck,

#9 2 years ago

Just an idea..what’s your reset signal doing? Does it go high? You can check that with a normal meter.

#11 2 years ago

Referencing that 2nd link I posted, put your black lead on test point 10 (ground) and your red lead on test point 8 (reset). It should be 5v when machine is powered up. If it’s not, you’ve got a problem with the reset circuit, and there should be some things on pinwiki to help with that.

#14 2 years ago

Nothing to see....Williams originally had some trancievers there, but decided they didnt need them, so replaced them with these things that look like ICs, but are really just strategic jumpers.

Reset is 4.9? That's probably good.

Is PIA IC18 socketed?

#16 2 years ago

Sorry, I'm kind of out of ideas without being there myself.
Do you have the soldering skills to remove any soldered chips on the boards? If it were me, I'd probably remove the PIA on the CPU board and see what that did.
Do you have a logic probe? If so, you could check the address lines and see if they're pulsing (which would mean the CPU is running). I'm guessing they're not. You can see a lot with a logic probe.

In that picture of the IC9 and IC10 above, it doesn't look like your processor chip is fully seated in the socket strips.

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