(Topic ID: 219450)

WMS System 7 (Pharaoh) Boot Issues

By spiroagnew

5 years ago



Topic Stats

  • 8 posts
  • 2 Pinsiders participating
  • Latest reply 5 years ago by zacaj
  • Topic is favorited by 1 Pinsider

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#2 5 years ago

http://www.flippers.info/system6repairpart4.asp

Sounds like you have a short in your driver board. Not many good ways to find it sadly. Probably one of the chips is bad, unless there's some bridged trace somewhere. Try just leaving it plugged in for a while and see if any parts get hot?

How are you 'connecting' the driver board? All connectors? Just interconnect?

Tried a test rom to confirm your MPU is fine?

#4 5 years ago
Quoted from spiroagnew:

When I press the diagnostic button, I get flashes of numerals 1-2-3 in the display and then it returns to normal pulsing. I'm not quite clear on if that is supposed to happen? Maybe I'm misinterpreting but I think the numbers would stay locked on if there was an issue?

That sounds good

Quoted from spiroagnew:

I added the driver board via 40pin interconnect, and the LED pulsing occurred.

So on the bench, it works even with the driver connected? And your 5V stays high?

Does it boot on the bench with the regular roms and the driver attached?

If you put it in the game with only 1J2 and 2J8 plugged in, does it boot with the test rom or normal roms?

#6 5 years ago

Do you have a logic probe?

#8 5 years ago

With the regular rom in and the driver board attached, I'd check all the address and data lines, etc that go across the interconnect, see if any of them are stuck.

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