My original ][ uses a 1979 model 2 Keyboard with Datanetics DC-60 switches (straight stem).
Many of them do not return true and are not making proper contact. I hand jumpered the solder points to identify that the encoder is fine, and that the mecanism works properly. THe only issue is that the keys do not return to their false state, so the matrix is corrupted by partially closed gates.
What is the best product to use to lubricate them? I considered dielectric grease, but that is too heavy and I would expect it to result in the key column sticking worse than it does not. It could also leak ontot he contacts.
Have any of you restore these switches? I suppose that replacing the springs may help, but I'll need to figure out what the desired spring size and tension is first, then hope that the spring company that I worked with years ago is still in business.
Assuming that these are the Datanetics switches that were in so many early Apple IIs, you shouldn't lubricate them, however you can safetly flush them with some mild solvents. I usually remove the key caps and thoroughly flush them with Isopropyl Alcohol while pounding on them and repeat several times over the course of several days.
regards,
Mike Willegal
IPA is unobtanium right now. I trieed QD Electrical cleaner thus far. I can try some other solvents, but I'm unsure if the springs are simply shot, so I may need to dismantle the switches to check inside them. I was however, incorrect: They are DC-50s, not DC-60s.
I can try some brake cleaner , then contact cleaner in there.