UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

julie_m · 10th Apr 2021, 2:01 pm

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.

10th Apr 2021, 2:01 pm	#1507
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	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. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.