(Topic ID: 257993)

Blowing F104 & F105 On Start-up

By Biglouie

4 years ago


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#17 4 years ago

Start the machine with the coin door open. Once it boots up, close the coin door. If it doesn’t blow the fuses, it could be a transistor on one of the boards affecting the blanking circuit.

When you power it on, the D19 led on the MPU should illuminate for a few seconds and then go out. If you don’t see D19 light up, that’s the issue you need to start tracing.

#24 4 years ago
Quoted from Pin_Guy:

I would try flipping over the small ribbon cable between the CPU and Power board. I've actually never ran into an issue where the blanking signal doesn't do its job.

I have. My new Rotten Dog auxiliary driver board had a bad transistor that caused the blanking circuit to be inoperable. Powering the machine on caused F103,104 & 105 to blow randomly.

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