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 >> >> >>
