Defender rug pattern and need coin door wiring/service panel pinout

mecha

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Defender rug pattern and need coin door wiring/service panel pinout

I punted on the last board set (from "Defender 4 light shenanigans") and bought one that's known working.

I'm getting the repeated rug pattern with the correct startup sound and all. I have NOT checked voltages yet, going to do this now, but read on:

upon closer inspection I found a molex plug floating in the bottom of the cab with some red white and yellow wiring (that I recall) and noticed the coin door harness was completely hacked off.

was wondering if anyone out there could tell me if the repeated rug correlates with missing switches or if anyone could tell me what wire does what so I can redo the harness.

will one of the new-ish MK2 style service panels (the red and black button kind) work in place, or do I need something that will stay closed like an interlock? I have like 2 of those laying around dormant. lol

EDIT: or does that connector go to the power supply board? forgot to mention, mine has been modified for a switching power supply.
 
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The piece that has been hacked off goes to the power supply, and the coin door. It also provides ground for the switches and the coin door.
 
You would need 2 momentary switches and 1 on/off switch.

high score reset and advance are momentary

auto/manual is an off/on type
 
just to get it running though I don't really need the auto/manual right? just the Advance switch?

I should've saved that thread that had the replacements on digikey or mouser, I forget. I imagine you would know what they are though, right? :)
 
according to my notes marco 5641-09369-00 $9.05

Without the auto/manual switch, you will be in manual mode

You can cycle through the tests by grounding 2J3 pin 2 for each time you want to advance
 
I think the rug pattern usually suggests bad ram, doesn't it? It has been years since I dealt with a rug pattern on my defender, but I recall needing to replace two or three RAM chips.
 
ironically my new board says "RAM GOOD" lol

I think it's the voltage. the switcher wasn't screwed down when the cab was moved (I cleaned the fuck out of this cab), it potentially knocked the +5 down.

the extension cord got snatched from me, now I can test it again.
 
ok, I tried testing the RAMs across the lower right corner and the upper left, and I'm getting 12 volts to these. they're 4116s.

is that correct???

EDIT: ok, I stand corrected, these actually use -5, +12 and +5. pin 1 = -5V, pin 8 = 12V (the one I actually tested at), and pin 9 = +5V.

EDIT EDIT: I kept stepping the voltage up at the PSU to get 5.00 (at least) at the RAMs... turns out there's little power loss going to the ROMs, so I stopped. even at 5.03V at the RAMs the game still kept looping the rug pattern.

could this be a problem with my wiring harness or should I explore reflowing the power pins on the main board or what...?
 
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Anything over about +4.8V will work, so +5 at the pins is definitely optimal. What are the 4 leds on the ROM card doing? They should be flashing some diagnostic message.

I haven't played with Defender that much but as I recall it goes RAM test then ROM test, so maybe you have a bad ROM or the Ribbon cable to the ROM card needs to be recrimped or replaced.

ken
 
if I recall, on power up there's all 4 lit on the rom board, then they shut off, then I think it goes (left to right), lit, not lit, lit, lit.

this boardset was advertised as working and I dropped good coin on it. it should've just worked.

now I'm sure this should be mentioned, the sound board from the new set I got has an option connector, so I'm guessing this is the newest model sound board (wasn't there an Aux card for doing speech on later games?) so am I correct in understanding that this sound board must be mated to this rom board?

when installing the boards I forgot to change the sound board and it would play that obnoxious sound board diagnostic pattern over and over. lol
 
Dumb Curiosity(tm) 101

I just started swapping the shitty looking roms out of the new rom board with ones that I took the time to sand/clean with alcohol from the old one (one by one by one!) and knocked the PSU voltage back to like 5.15 and guess what?

Initial Test Indicate
Unit OK

;)

so in case anyone TRULY gives a shit, it was a rom issue.

now time to start wiring up my service switch harness that was lopped off for no apparent reason.
 
Regarding sound cards with the speech card connector. Rev 2 Defenders had them and very early Stargates had them. Then Williams saved $0.27 and didn't add them until Sinistar. They were a hold over from the pinball sound cards (allegedly the first Defenders literally stole a box or two off the pinball line...).

ken
 
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