(Topic ID: 207343)

Black Knight, what ails thee? Diagnostic switches, game start issues

By solarvalue

6 years ago


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  • 20 posts
  • 8 Pinsiders participating
  • Latest reply 6 years ago by steveopdx
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#10 6 years ago

If the game is booting into audits, you have a bad battery or bad RAM on the CPU board.

Reflow the solder on the diagnostic switch connector on the CPU board or replace the header pins entirely. If that's been done, replace the IDC connector with a new crimp on style connector.

#13 6 years ago
Quoted from solarvalue:

I've changed the battery, where is the RAM on the CPU?

Did you carefully inspect the battery socket to make sure the contacts are not corroded? With the game off, measure the voltage between pin 8 and 22 on the RAM chip to make sure you have 4.5 to 5V

#19 6 years ago
Quoted from solarvalue:

OK, so it didn't last. The game started playing up again. I replaced the RAM chip with a new one from Great Plains Electronics. Everything works now, even the diagnostic switches which I was surprised about.
One thing to note is that I bought 5 x 5101s from Great Plains. When I put the first one in, the game wouldn't boot at all, so some of these chips might be bad.

You might have a bad socket there. Old single wipe sockets don't last forever.

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