williams defender

felix67

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My williams defender game came up with a intinal ram test failure and was wondering If I should replace all 24 the 4116 16 pin ram and were can I get them from and what should they cost .Or is there something else I should look for in the machine ?
Thanks Chris
 
Hi Chris,

4116 chips should be about $0.50 each or so, but the big killer is usually shipping and/or minimum order fees. Dave from RAM Controls was advertising $20 per tube of 25 shipped, which is about as good as you are going to get (link). You might want to shoot him a PM and see if he still has any. Otherwise, depending on where you are located, there maybe members here that have a few they can sell you and avoid the shipping charge. You can add your location to your profile so it appears in the upper right header.

Other locations include:
http://store.pacmandotcom.com/5-ram?p=2
http://www.unicornelectronics.com/IC/DYNAMIC.html


ken
 
4116's are old chips. They run hot and draw too much from the power supply. For the same price, you might want to consider 4164's. There is an adaptor you can build very easily. Instead of +5, -5, and 12v, the only use the +5. Saves on your power supply, run cooler and are less likely to fail. Check out this link.
http://www.robotron-2084.co.uk/techwilliams4164.html
 
Yeah- replacing them all at once is called 'shotgunning it'.

I haven't done it, but I'd recommend upgrading to the 4164's also. The little adapter necessary is trivial.
 
Yeah- replacing them all at once is called 'shotgunning it'.

I haven't done it, but I'd recommend upgrading to the 4164's also. The little adapter necessary is trivial.

Even easier to cut 2 traces and add a jumper. The adapter needs to follow the board, and that's annoying :)
 
I have a board that won't do anything. theoretically speaking, how much money is considered too much to dump on one of these boards?

I'm not an uber circuit wizard... not a logic probe-ish kinda guy.

then again, does anyone on here actually just fix them?
 
I have a board that won't do anything. theoretically speaking, how much money is considered too much to dump on one of these boards?

I'm not an uber circuit wizard... not a logic probe-ish kinda guy.

then again, does anyone on here actually just fix them?

It all depends on how bulletproofed you want it... a lot of times, it's cheap to 'fix' it --- just get it working for a while, but if you want it fixed the same way I fix my own games (all new 4164s, bunch of new sockets, new headers, etc), it's going to cost a *lot* more due to allt he time and parts involved...

On a board with battery corrosion, replacing all 24 RAM sockets is no small feat... heh... plus the CPU socket, video decoder sockets, 11 sockets on the ROM board, pull and socket the 6821s, just in case, etc....
 
I have a board that won't do anything. theoretically speaking, how much money is considered too much to dump on one of these boards?

I'm not an uber circuit wizard... not a logic probe-ish kinda guy.

then again, does anyone on here actually just fix them?

The amount of money you are willing to spend depends on what you are going to do with it. If you have a cabinet that is sitting dead, you may be willing to spend more than if you are going to turn around and EBay it as a working board. Dead Williams MPU boards seem to fetch $20 - $30. Working Williams MPU boards seem to fetch $50 - $100. Complete working boardsets generally command higher prices. A working Stargate boardset just went for $175-ish. An untested Joust boardset just went for $56 (it turned out to be a working set when I put it on my bench).

There are a couple of people here that do fix Williams boards. I know Saltbreez does, Andre (ArcadeSolution) does, I think Channelmanic does, I do, it sounds like Mark does and there may be others.

Since the phrase "dead" board could mean a simple fix or a real puzzler, it is hard to say what it would cost to get it fixed. Andre used to have a board swap for Williams boards. Your dead board + cash for a working board. Or you could take pot luck with the guy on Ebay. He is rumored to have actually fixed one or two boards, but usually just swaps them for other boards. Never used him, but I have fixed several of his "repaired" boards.

ken
 
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