Repairing my HP 67 Twins

[murphy9]

Thanks to all for reaching out .

As a side note to anyone cleaning/restoring the keyboard plate, be very carefull with which solvent you use to clean. I used my go-to isopropyl alcohol and was left with a white deposit. As the isopropyl alcohol is 99.99% pure I can only assume that the deposit is the original lacquer or coating on the plate. Luckily I was able to get rid of most of it with cotton bud and water with a tiny drop of washing liquid. Applying five coats of Tamiya TS-80 has levelled the surface, removed shiney artifacts and left the surface beautifully smooth and flat (I've enclosed a shot).

The mag reader works but I'm getting an error, so will need to jump into more detail on that and probably change the capacitor. Gummy rings replaced last year so the cards feed well.

waterhosko's battery back holds up well and charges nicely from the PSU.

Getting time to do all this is the issue - so slow project.