(Topic ID: 207022)

Shaq Attaq - EPROM CHECKSUM FF-12


By scampcamp

2 years ago



Topic Stats

  • 11 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by MarAlb
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#4 2 years ago

$FF12 is the checksum from a shaq revision 5 gamerom. Everything is fine here and you are running the latest revision. Gott system 3 is Always showing the checksum after powering up.

#6 2 years ago

The 2 big capacitors on the auxiliary power supply are often causing this.

1 week later
#9 2 years ago
Quoted from scampcamp:

I changed the 2... 10,000 mfd & 25 v capacitors on the auxiliary board tonight but it didn't help at all. Any other ideas? Thank you. It's pretty loud and annoying.

Not really. Any change in the humming? Did the plated holes survive when removing the old snap in caps? Pretty easy to break them and when this happen you will loos continuity between top and bottom side of the circuitboard.

Are both speaker humming?

#11 2 years ago

Can you measure the ripple voltage over capacitors C7 or C17 and C8 or C18 with your voltmeter in AC mode?

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