UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

ScottishColin · 27th Sep 2022, 7:11 pm

Sandpaper is a bit interesting.

I used a sheet of plain A4 from my printer, folded it a few times and gently ran it over the plungers. It fixed most of the keys. For the few that didn't work, a slightly more vigorous going over with the paper fixed the problems.

Colin.

EDIT - I also cleaned the PCB with 99% IPA while I was there, but mine was nicely new (apart from a couple of broken traces) having been sealed up for 40+ years anyway. You might not need to do this if the cleaning plungers works.

27th Sep 2022, 7:11 pm	#132
ScottishColin Octode Join Date: May 2012 Location: Perth, Scotland Posts: 1,822	Re: 1978 Commodore PET project Sandpaper is a bit interesting. I used a sheet of plain A4 from my printer, folded it a few times and gently ran it over the plungers. It fixed most of the keys. For the few that didn't work, a slightly more vigorous going over with the paper fixed the problems. Colin. EDIT - I also cleaned the PCB with 99% IPA while I was there, but mine was nicely new (apart from a couple of broken traces) having been sealed up for 40+ years anyway. You might not need to do this if the cleaning plungers works.