Re: Non-working Commodore PET 3016
You probably could test the keyboard switches for continuity while it is unplugged, squirt a little Servisol Super 10 down the plungers of any dodgy ones, give them the "track and field" treatment and leave the keyboard assembly in a still-warm but unlit oven to drive off the last of the solvent vapours.
If no keys work at all on the computer, despite testing OK, suspect UC9 (74LS145) first.
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