Arcade Collecting > Restorations & repair
TheShanMan's Defender restoration - New repro wiring harnesses!!!
SirPeale:
Just pick one of them for now. It's a horizontal centering pin. When you get a stable working picture you can adjust it to best fit. When you recap the monitor likely you'd have to move it again anyway.
Oh yeah...as for the RAM, good that none of it is hot. And as for the different numbers, sometimes manufacturers will have different numbers for compatible parts. Not sure about 4116 RAM. But you should trade the 4116 for 4164 anyway. I'll be offering RAM and an adapter in my store soon.
TheShanMan:
Are you suggesting that the ram may be part of my problem? Or just that it's a good thing to do, and in my case more preventative maintenance than anything else? And the caps - is a cap kit just "good to do" but nothing to do with my problem? I'm fully willing to spend the money to do it right, but just wondering if these are things that might be factoring into my problem or more of a "while you're at it, might as well do the caps and rams"?
Also note that I edited my last post with a better pic as you requested.
Kevin Mullins:
--- Quote from: TheShanMan on August 31, 2008, 11:30:00 pm ---And to bring attention to an old question again: is there no such thing as "rom 5"? I have 11 roms, numbered 1-12, with a hole at #5.
--- End quote ---
http://www.crazykong.com/pcbs/A%20-%20F/Defender.pcb.html
SirPeale:
4116 RAMs on Williams boards are problematic. They're a high-fail item. If there aren't any bad RAMs on that board I'll be surprised. It's because they take multiple voltages - +5V, -5V and +12V. Conversely, 4164’s only need +5v and runs much cooler.
Recapping the monitor makes sense because the originals are 30 years old. They're not getting any better. But since your monitor is currently working, I'd concentrate on getting the boards working first.
The RAM may very well be part of the problem. Check the ROM board, there are four LEDs. What do they do when the machine is booting? You can open the coin door and look inside to see what it's doing after hitting the power switch.
SirPeale:
And yes...there's supposed to be an empty hole there.
Another thing to consider is the damage from the battery. It looks like the traces may be eaten away, you may have to run some jumper wires.
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