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Archilog · 08-31-2018, 01:14 PM

Hello everyone,

I've bought a "cheap" but heavily blue-white-green corroded HP-25c and washed and cleaned it. It was so damaged that in the wash process I almost lost a component; this the "big" black transistor on the left of the first (mid) RAM chip (thank you, Harald!):

[Image: 25chrrvg.png]

Now, I have to test it (and every component I guess) and to solder it (or a new one) on the board again. But where does it connect onto the board? I didn't find any picture or schematic neither in this site, nor on the PPC DVD of Jack Schwartz.

Any help will be appreciated.