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 > > 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 >>>>> >>>>> >>>>>
