9

My Apple IIc is what appears to be the first US model: A2S4000 with version 255 ROMs. The keyboard PCB is marked 820 0108 03 ©1983, and the keyswitches are the "cross" type as seen below, without any obvious brand markings.

Most of the keys on the keyboard are very stiff and do not depress smoothly, requiring more than usual pressure to depress and then often depressing with an uncomfortable sort of a small "crunch" after which the pressure needed to bottom out the key decreases enormously. This happens particularly when not striking a key dead centre, getting worse as one moves further from the center of the key, though it happens for many keys even when pressed dead centre. The degree of the problem varies between keys; Q is pretty smooth for both centre and edge presses, whereas W is bad even for presses dead centre. The reset has the same issue. (That's not really a surprise; it appears to use the same keyswitch as the rest of the keys.)

The caps lock key and 80/40 and keyboard switches (again, all appear to be using the same keyswitch) also don't release easily from their depressed ("on") state; they need to be wiggled as one depresses them when trying to get them to release.

What are my options for improving the feel of my keyboard? Is there some sort of cleaning (perhaps involving isopropyl alcohol or contact cleaner) or lubrication I could do that would help fix things? Or do I need to replace the switches? In the latter case, the easiest option would be to find a replacement keyboard, but those seem difficult to find and expensive. If I were going to go so far as to desolder all the switches and replace them, what switches could I use?

  • 2
    FWIW, I have the same annoying stiffness/crunch in my //c keyboard. I hope someone can answer this... but I've always suspected it to be a function of age and the way the keyboard was designed. I keep my //c for my collection, but for daily driving nothing beats a Laser 128! :-) – Geo... Nov 22 '19 at 10:33
  • 1
    This guy has some videos on disassembling and repairing individual switches on the IIc. See "Assembly lines" #48 and #49. youtube.com/playlist?list=PLulp9MiRMeNonsKuYpPBr7QkGRciah7aL – alephzero Nov 22 '19 at 17:09
  • @alephzero Thanks for the video links! Unfortunately for my question, he was repairing a later model Apple IIc keyboard which used Alps switches instead of whatever ones the early Apple IIcs used. That said, having seen that I have a better chance of understanding what's going on in my keyswitches should I work up the nerve to take one apart. – cjs Nov 28 '19 at 8:14
  • You have probably seen the entry for the key switch in the Deskthority wiki: deskthority.net/wiki/Apple_hairpin_spring – HalvarF Aug 12 at 22:31
  • @HalvarF I had not seen that, and it's great info! Thanks! – cjs Aug 14 at 10:11
0

On comp.sys.apple2 Has answers and info of how to fix keyboard, but is the keyboard in question the right one? Also some of the fixes in there are not for the fainted heart. So continue with caution, searching more on the group could get more information. But one short quote from there:

"Also, somebody else mentioned that the ROM 255 keyboard had springs that were problematic. They removed those and the rubber mat underneath." More comprehensive repair details in the link. And the look of your keyboard, the rubber membrane has teared, so you would need to clean possible dirt or residue inside the keyboard and add more tension on springs maybe? If rubber membrane is not obtainable or cannot/ want take apart completely the key switches, then probably easier would be to look replacement keyboard. This keyboard Looks like yours?

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.