- Posts: 3342
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
If the edge-connector on the ZX81 (or indeed, any edge-connector where tinned finger contacts are used (a dull silver colour)), needs further work, use either a eraser designed to remove ink (NOT one designed to remove pencil lead) or a ‘PCB cleaning scrub block’.
Alternatively use a ‘fibreglass abrasive pencil’ / ‘glass fibre cleaning pen’.
In all cases, make sure you don’t breathe in the dust that is produced. Collect up the dust and dispose of it properly as the dust will contain lead.
Finish up with another clean using IPA.
When cleaning, you are looking to just take the surface layer off so that you get a nice shiny silver colour. If you get down to the copper layer, stop cleaning.
Cleaning the males, use a pencil eraser n go over the fingers till they are nice n shinny again.