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I am curious what a transistor and a jumper in line would be used for. I'm no board expert but vestigial R80 seems right.
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Thanks for the info. I could not recall what your tests with previous mods were, so this is helpful information.
The stock CC board not...
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Of note, there's another way to identify boards: their serial schemas.
I've noticed two different schemas for 520s: EZxxxxxxDY7 and...
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I believe on these machines the Gestalt is determined from some combination of CPU speed and sense pin detection on the machine's logic...
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I can also confirm that R80 is missing on my Rev A LC550 logic board for another data point. No idea if R80 is populated on a Rev B...
