(Topic ID: 35328)

Vid's Guide to Bulletproofing Williams System 3-7

By vid1900

11 years ago

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Latest reply 26 days ago by jar155
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Linked Games

Alien Poker Williams, 1980
Black Knight Williams, 1980
Blackout Williams, 1980
Comet Williams, 1985
Disco Fever Williams, 1978
Firepower Williams, 1980
Flash Williams, 1979
Gorgar Williams, 1979

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Quoted from Robotworkshop:
Recently I’ve run into an odd issue on a System 3 MPU in a Williams Hot Tip machine. The board is extremely clean and recently had a new 40-pin connector set and new DIP sockets installed.
The board doesn’t always boot. If I shut off the game and turn it back on it usually just comes up an plays normally without issues.
Read about the factory mod to the reset section of the MPU to remove c27, r30, and r40. Then add a 10k resistor. This board already has this mod done and appears factory.
Any other known reset mods for the System 3 boards or items to check?

If you've done all of that, I'm assuming you already proofed out the power supply?(check 5v output, reflow header pins as needed and maybe recap it)

Quoted from SMP14:
Hi there, I have a Williams time warp head with all the wire harnesses for the backbox. How hard would it be to upgrade the wire harness to a system 7 to make, oh idk a warlok or something. Any documentation on what the difference/conversion is? Thanks

I did this. I converted a Tri Zone to run a Cosmic Gunfight playfield. I probably should have documented what I did. I definitely had to repin one of the cabinet connectors to make it System 7 compatible. There was a GI connector is had to make. Luckily the system 6 and system 7 displays are the same width. You can mount the system 7 displays with two nuts if you are a low life like me. Also, the position of the Trizone displays and Cosmic Gunfight displays pretty much lined up. I think that was it?

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