I’m in the process of bench testing the mpu from my recently acquired Flash machine. This is an earlier system 4 machine. I just noticed that I’m missing D3 that runs to the data switches. It’s completely gone. The BOM shows it to be a 1N4148. I have some 1N4004s here. Can I replace it with one of those? Should I replace them all with the same rating? Should I order the correct one?
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