A couple of weeks ago I got my hands on a Japanese Sony HB-F900 (the black one). It is in decent condition but needs a good clean.
One of the, bigger, issues is the keyboard (KBD-13 (B) ). Most keys do not work.
I opened up the keyboard and luckily it is not a membrane one, but one where the key domes complete the circuit on the PCB to do a key press.
Any tips on how to restore the keyboard to working condition? What is a safe way to restore conductivity of the key traces?
I'd first completely clean the keyboard, especially the conductive black tips. And you could use a soft pencil to make them conductive again. There's LOADS of screws though... done it too often in the past. My reference is the KBD-12P.
Thanks! So far I did some cleaning (really needed) and have used an rubber eraser on the traces for the keys. It works a bitter better. Should those traces be shiny copper? The erase took of a bit of black but there not shiny.
The shinier, the better. Thoroughly clean it with isopropyl alcohol until all residues are gone.
The rubber tips are the weakest part and usually are hard to restore 100%, you can use a q-tip with alcohol to remove the possible accumulated dirt in the surface and then, restore its conductivity using the above mentioned pencil or silver paint (expensive but lasts longer than the pencil). All in all, a good amount of work.
