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 On Wed, Apr 19, 2023 at 4:18 PM Gregory McGill <arcadeshop...@gmail.com> wrote: > Cool can you share the part > > On Wed, Apr 19, 2023, 11:35 AM David Plass <dpl...@alum.mit.edu> wrote: > >> To answer my own questoin _again_, about half the function keys were >> toast, but they seem to be a standard part (!) so I was able to order some >> replacements. >> >> On Mon, Apr 17, 2023 at 9:00 PM David Plass <dpl...@alum.mit.edu> wrote: >> >>> Thanks. >>> >>> To answer my own question, the 1N4148 diodes worked perfectly. All the >>> regular keys are working. The function keys, not so much. I've squirted >>> lots of electronics cleaner and clicked each switch dozens of times and >>> only a few of the 7 or so broken switches have come back. Right now I >>> dripped some vinegar inside to hopefully break up whatever corrosion might >>> be inside... >>> >>> On Sun, Apr 16, 2023 at 7:45 PM Brad Grier <b...@bradgrier.com> wrote: >>> >>>> RE: the polarizing film -- Jeff Birt (on this list) suggested >>>> https://3dlens.com/ >>>> >>>> I have some, just haven't got to my project that needs it yet :D and >>>> with the onset of spring, that one may sit for a bit. >>>> >>>> --Brad >>>> >>>> On Sun, Apr 16, 2023 at 2:10 PM David Plass <dpl...@alum.mit.edu> >>>> wrote: >>>> >>>>> I couldn't resist a recent M100 on ebay listed as "not working". The >>>>> main issue was a dead contrast pot, which I have temporarily worked around >>>>> and ordered a hacky replacement. >>>>> >>>>> The polarizing film is also very bubbly and no amount of smoothing >>>>> made it stay flat on the LCD. Is there a known replacement for the film? >>>>> >>>>> Most importantly, I noticed about a half dozen non-functional keys. >>>>> After disassembly I discovered corrosion on their diodes. Upon closer >>>>> "inspection", said diodes disintegrated. >>>>> >>>>> So my second question is: Is there a particular diode I should replace >>>>> them with? I have tons of 1N4148s, which look like a match (and >>>>> electrically drop about the same voltage), but I can't find a spec for >>>>> those diodes on the m100 schematics. >>>>> >>>>> Thanks >>>>> -David >>>>> >>>>> >>>>> >>>> >>>> -- >>>> -- >>>> Brad Grier >>>> >>>> >>>>
