Defender Help?

Madaracs

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Hi guys,

I have a Defender that has a Happ Switching Power Supply in it.

I bought it non-working. The previous owner shipped off the RAM/CPU board to Eldorado and it's been there for 6 months or something at this point I'm not ever expecting to see it.

In the meantime I bought a lot on ebay of some Defender boards: 3 ROM boards and 4 RAM/CPU boards. I've been attempting to get them up and running. All were shipped "as is" to me and I expected them to not work.

The rest of my Defender boards are all present so I decided to upgrade the RAM on the two complete RAM CPU boards and do this suggested mod:

http://www.scoresaves.com/misc/JustSayNoTo4116.html

I'm not sure how Defender is supposed to be wired up with the switching power supply in, so I just plugged in everything I could find and fired it up.

Nothing, nada, zilch. Just a high pitched wine, the four LEDs lit up solid on the ROM board and nothing happens.

Is there a basic troubleshooting guide someone could point me at so I know where to test voltages and stuff?

I've also been reading that I should recrimp the interconnect cables as well?

I would LOVE to be able to ship my CPU/RAM boards to someone to see if they could get them to work in their machine if anyone would be willing to help me out here?
 
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There is a troubleshooting document available at arcarc.xmission.com (http://arcarc.xmission.com/PDF_Arcade_Williams/Defender_Recap_CPU_Part_1.pdf).

To wire a Williams game up to a switching power supply, you need a switching power supply that has +5V, -5V, +12V and -12V.

The easiest way it to wire up a 15 pin header with:

Pins 15,14,13,12 going to +5V
Pins 11,10,9,8,7 going to ground
Pins 5,6 going to +12V (see notes below)
Pin 4 going to -12V (see notes below)
Pin 3 going to +12V (see notes below)
Pin 1 going to -5V (see notes below)

You can get by with a switcher that has +5, +12 and -5 by plugging the -5 into pin 4. This goes to the sound card. The only issue is that the sound will be reduced slightly as the -12V only goes to the amp chip, IIRC.

If you have made the 4164 chip mod, you can get by without plugging -5V into pin 1 and +12 into pin 3. You still need +12V on pin 5 for the CMOS memory protect on shutdown and on pin 6 for the sound card.


ken
 
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Full size shot of all boards:

http://farm9.staticflickr.com/8193/8117668356_ce7879b37a_o.jpg
 
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