Yeah, if those switches are the type I think they are, they're not exactly manufactured to the strictest tolerances...
But kudos for getting it all working. Now to start playing... m On Sat, Apr 29, 2023 at 3:18 PM David Plass <dpl...@alum.mit.edu> wrote: > Heh. > > Yep, all the function switches are working and all the regular keyswitches > are working. > > However... the replacement function switches have more rotational "play" > than the old ones so some of them look funny. I may use some kind of > flexible tape on the "lower step" of the function keycaps to prevent them > from tilting. > > On Sat, Apr 29, 2023 at 3:05 PM Mike Stein <mhs.st...@gmail.com> wrote: > >> It's no fun if it's too easy ;-) >> >> A shame about the pant & the extra effort; did you get all the switches >> working/replaced? >> >> m >> >> On Sat, Apr 29, 2023 at 3:01 PM David Plass <dpl...@alum.mit.edu> wrote: >> >>> Latest update: >>> >>> I used lots of 99% IPA and got much (but not all) of the paint off the >>> keyswitches and PCB. I gave up after a while and decided it's good enough. >>> >>> I found a replacement contrast potentiometer. Its leads are a little too >>> short so it's too loose in the PCB and therefore intermittent, so I may use >>> a regular pot sticking through the hole, which is TBD. >>> >>> I derusted and painted the metal bracket at the top of the keyboard and >>> reassembled everything. >>> >>> Working off a wall wart, it was fine, but when I popped in some >>> batteries, it didn't turn on. >>> >>> I tracked it down to the barrel jack "interlock" failing, so it always >>> thinks there's a power plug inserted. I removed the old barrel jack and >>> installed a new one that is *almost* the right size. I'm going to have to >>> modify the case to get it to fit flush. >>> >>> Two steps forward, one step back, but it's still progress. >>> >>> >>> On Sun, Apr 23, 2023 at 5:37 PM David Plass <dpl...@alum.mit.edu> wrote: >>> >>>> An update: >>>> >>>> Unfortunately there was a freak accident in the workshop... I'm >>>> de-rusting some of the keyswitches and the on/off switch and figured after >>>> removing the rust I'd paint over the rusty areas (it's not ideal, but the >>>> best I could do). >>>> >>>> One of the switches was "clean" so I temporarily installed it on the >>>> keyboard PCB. To paint, I was going to use a silver "paint-pen". While >>>> shaking the pen (according to the directions), the pen exploded and >>>> splattered paint on the keyboard and PCB. About 4 switches were inundated >>>> with paint and another 2 or 3 got some paint splattered on them. >>>> >>>> I spent about a half an hour cleaning the paint as best I could using >>>> 99 IPA, but there's still some paint on the PCB. >>>> >>>> A few hours later I checked some of the affected switches and I think >>>> the paint has dried inside them, because they're open circuits now. I tried >>>> De-Oxit, and they are revived, but I fear it's only temporary. >>>> >>>> My question for the forumbrain is: can the keyboard switches be >>>> disassembled for 'deep cleaning'? I would desolder them first, obviously. >>>> >>>> Thanks >>>> >>>> >>>> >>>> >>>> On Thu, Apr 20, 2023 at 10:48 AM Gregory McGill < >>>> arcadeshop...@gmail.com> wrote: >>>> >>>>> thanks! >>>>> >>>>> On Thu, Apr 20, 2023 at 4:14 AM David Plass <dpl...@alum.mit.edu> >>>>> wrote: >>>>> >>>>>> I was surprised too but it's a near exact match. I tried the key caps >>>>>> and, while they're tight, they definitely fit. >>>>>> >>>>>> On Thu, Apr 20, 2023, 6:25 AM Louis Ciotti <lciot...@gmail.com> >>>>>> wrote: >>>>>> >>>>>>> I would have never thought these would have been used back when the >>>>>>> M100 was designed. >>>>>>> >>>>>>> Sent from my iPhone >>>>>>> >>>>>>> On Apr 19, 2023, at 10:03 PM, David Plass <dpl...@alum.mit.edu> >>>>>>> wrote: >>>>>>> >>>>>>> >>>>>>> The function keys are 12x12x7.3mm tactile switches with square tops >>>>>>> and PCB/through-hole mounting pins. >>>>>>> >>>>>>> For example: >>>>>>> https://www.amazon.com/TWTADE-Momentary-Tactile-Button-12x12x12mm/dp/B07CG7VTGD?th=1 >>>>>>> or >>>>>>> https://www.amazon.com/ACEIRMC-12x12x7-3mm-Momentary-Tactile-Arduino/dp/B091HL5YBD/ref=sr_1_3 >>>>>>> >>>>>>>
