[IGNORE] Defender Cocktail: *Putting it up for sale*

TCinTEXAS

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[IGNORE] Defender Cocktail: *Putting it up for sale*

Since I'm down to mostly cosmetic stuff on the rest of my cabinets, I decided to start on my defender cocktail.

First big question: I can't find the layout of the ram banks. I'm getting RAM Error 18, but can't find anything to identify which order to read the banks and chips. I know it's probably a stupid question, but help me out, anyway.

Looking at the board with the power connector at the top left, the bottom right RAM socket had been ripped off. I replaced it and the 4116. The capacitor was shorted, so I replaced that. I also recapped the board.
 
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the banks should go in order 1-2-3 left to right. they then go 1-8 from bottom to top. so the ram where you do the 4164 power mod, that's bank 3 ram 1, or in other words, the origin of the ram power, or in essence, the cause of the 1-3-1 error when none of your ram works. ;)

the ripped off socket should be the 1-1-8 ram.
 
the banks should go in order 1-2-3 left to right. they then go 1-8 from bottom to top. so the ram where you do the 4164 power mod, that's bank 3 ram 1, or in other words, the origin of the ram power, or in essence, the cause of the 1-3-1 error when none of your ram works. ;)

the ripped off socket should be the 1-1-8 ram.

If they're 1 through 3, left to right, and 1 through 8 top to bottom, assuming the power connector is at the top left, wouldn't the bottom right chip (the one with the damaged socket) be bank 3, chip 8?

I haven't done the 4164 mod, yet. I won't until I get it working. I was feeling really stupid, thinking I completely missed the fact that I was missing a ROM, but then found that ROM #5 is skipped on the red label ROM set.

EDIT: Or is it the other way around. The Williams Logo (above the battery) upright, so it's banks 1 - 3, top to bottom, and chips 1 - 8, left to right. That makes more sense.
 
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1-3, with the ram in the upper left corner. we're seeing the same thing, just from opposite ends. :p
 
1-3, with the ram in the upper left corner. we're seeing the same thing, just from opposite ends. :p

Ah... if that's the case, the bad socket was bank 1, chip 1. RAM 18 would be at the bottom of that column, closest to the smaller ribbon cable.
 
you said you had a ram error 18, I just confirmed the one with the bad socket was 18. :)
 
you said you had a ram error 18, I just confirmed the one with the bad socket was 18. :)

Never mind. I wasn't catching the bottom to top.

Ok, so I put in a new socket. The .1uf capacitor was shorted, so I replaced it. I'm still getting RAM error 18, what next?

I'll check the voltage when I get home from work. I'll try to find the pin voltages. I found them once, then lost them! :)
 
I'm just going to put this here so I don't forget.

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And to confirm what I found in another thread, to test the voltages at the chip (is that recommended?) for 4116, I should see:

Pin 1: -5 Volts
Pin 8: +12 Volts
Pin 9: +5 Volts
 

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there's no need to measure for voltage at the rams. throughout the course of history at KLOV, you'll find there's heavy statistical evidence that every single time someone has tried it, they've conveniently "slipped", and now they've done even more damage.

+12 and -5 have a wider range of operating tolerance than +5, but if you measured sufficient voltage at the power plug and have replaced at least the headers and caps, you don't need to worry about it unless you're using linear and the parts are old on it and need to be replaced.

don't forget the axial cap there. apparently that's for ground. :)
 
assuming the U-shaped notch on the ram is facing to the left...
upper left: +12 (where +5 normally is on logic chips)
lower left: +5
upper right: -5
lower right: ground

another reason you shouldn't measure voltage at ram. not sure where you got your intel, I'm willing to bet if you measured that way you would short them out easy. apparently the -5 voltage is the weak spot on those rams; if -5 supply drops out, all the rams fry.
 
I give up. I'm going to find someone to fix this for me. Until I can make room for some sort of test bench, this is just too tedious. I'm too old and fat to be crawling around on the floor! :)

I'll concentrate on the easy things, like rebuilding the power supply, recapping the monitor and cosmetics.

In the meantime, I snapped a couple of pics. Maybe some of you can tell me what's going on here:

There was fire! If I'm not mistaken, this looks like what's left of the little coin door diode board I was asking about on my Moon Patrol. They catch fire???
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What in the hell is this? Someone put in a couple of big ass resistors. Is that the coin door connector from the power supply? Did that start the fire, or was that because of the fire???
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Bump? Did the diode board start a fire? Can I buy/make another one? Does anyone know what the purpose of those big resistors might be? Is that in place of the diode?
 
I've never worked on a cocktail before, so I don't even know what that is or what it's for. where exactly does it run to?
 
I've never worked on a cocktail before, so I don't even know what that is or what it's for. where exactly does it run to?

I'll dig it out and open it tonight, so I'm not lying to you, but I'm fairly certain it runs to the coin door. Not sure if it's lights, coils, counter or what. If that's where the diode board use to be (as is my Moon Patrol), it would go to the counter. The wire appears burned, so it looks like they removed the burned diode board and inserted two resistors.

Of course, there's a chance the fire wasn't started by the diode board.

disaster-girl.jpg
 
I don't understand why there would be diodes going to the coin door lights or whatever it's for. there's already a ceramic resistor on the power supply for that.
 
I don't understand why there would be diodes going to the coin door lights or whatever it's for. there's already a ceramic resistor on the power supply for that.

There wouldn't be, but I'm just guessing when I say it was for the counter. I'm pretty sure it is based on the location, the burned remnants of a diode board and the burn on the yellow wire, but I can't be certain until I open it up and trace the wire.
 
Williams games don't have coin counters. :)

they were the first of their kind to have all settings and bookkeeping done electronically through menus. notice there's no dipswitches either.
 
You may want to swap out with 4164 Ram instead, if the problem still persists, then more than likely it's a socket on the CPU board. If that's still not the case, it could be the ribbon cable connection between the CPU and ROM boards, and finally if it's none of those...I'm stumped.
 
Williams games don't have coin counters. :)

they were the first of their kind to have all settings and bookkeeping done electronically through menus. notice there's no dipswitches either.

Moon Patrol does, but I guess it's technically not Williams.

Ok, then I'm at a loss as to what this little burned board would be, and why there are resistors badly soldered in its place.
 
You may want to swap out with 4164 Ram instead, if the problem still persists, then more than likely it's a socket on the CPU board. If that's still not the case, it could be the ribbon cable connection between the CPU and ROM boards, and finally if it's none of those...I'm stumped.

Yep. To be honest, I just picked up a Stargate in good condition. My plan was to get this one working and sell it, but about at the point where I'm just going to try to sell it as-is.
 
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