Every single Model 100 in the entire world needs the following maintenance: * memory nicad replaced (modern NiMH is fine) * Complete replacement of all electrolytic caps (complete recap) with proper cleanup of leakage and corroded joints/traces * Bath in ~100% IPA and scrubbing to remove factory flux residue
Without these things, your M100 is dying rapidly. These are 100% must-do repairs to all M100s now. I cannot stress this enough. -Josh On Tue, Sep 23, 2025 at 11:30 PM Erik Keever <[email protected]> wrote: > Internal NiCad for sure. > > It's also possible/probable that the electrolytic caps are failing. > Multiple caps in mine (the 1uF ones - the smallest) had failed and peed > acid onto the circuit board when I came back to it after many moons. It was > bad enough to sever the trace that brought the LCD bias to the display, > resulting in a zero-contrast condition. At this point those electrolytics > are 40 years old so recap is an excellent idea. > > On a tangent about the caps... the march of Progress has brought solid > state MLCCs within easy reach of all the capacitances up to about 1uF. Just > saying, MLCCs age far more gracefully (they DO age though, the high K > dielectrics undergo a phase change that's reset by soldering temps), and an > 0805 is just the right size to fit across two .1" thru hole pads... > > -- Erik > > On Tue, Sep 23, 2025, 6:53 PM John R. Hogerhuis <[email protected]> wrote: > >> Yeah if it hasn't been replaced it's probably the internal nicad. >> >> They all need to be replaced at this point. >> >> -- John. >> >
