On Fri, Nov 3, 2017 at 3:42 PM, william degnan <billdegnan@gmail.com> wrote: > Here is what I have so far > http://vintagecomputer.net/browse_thread.cfm?id=703 > > (waiting on the Keypad-Fix to be delivered via 2-day delivery) > https://www.amazon.com/gp/product/B0026PRMVM Thus far, all of my alcohol cleanings have been effective and I haven't resorted to paint or other add-ons, but if you are going to experiment, let me recommend measuring the resistance across one or two keys, then clean with alcohol, check again, then try the keypad-fix or any other refurbishment techniques and measure the resistance every time. I found while restoring a TRS-80 Model 4 kb that working keys started off around 400-600 ohms, bad keys were 2K ohms or more, then after successful cleaning were more like 100-200 Ohms. Unsuccessful cleanings did happen, but in the case of the TRS-80 keyboard, I found that rotating the rubber pad 90 degrees put a different part of the rubber in contact with the terminals in the keyswitch and then those same switches went from 2K down to under 300 ohms. I don't know that doing this for Commodore keys will work because I think more of the pad touches the fingers compared to the TRS-80 design, so there might not be enough unglazed rubber to rotate into use there, but it's an easy test. -ethan Message was sent through the cbm-hackers mailing listReceived on 2017-11-03 21:00:05
Archive generated by hypermail 2.2.0.