The M100 power supply requires parts of the M100 to be working before it starts running correctly. From memory, it's the minus 5v rail.
I'd start by ensuring that the backup battery was charged, and double checking all voltage rails. I'd also try a cold reset. Doug On Mon, 26 Dec 2022, 6:26 am Stephen Adolph, <[email protected]> wrote: > Well what's a little holiday without some hardware to fix! > > I think how i would tackle this is to trace the positive voltage from > battery through to the transformer. See if there is a place where positive > voltage is missing. > > If that looks good then the transformer circuit must not be oscillating. > One possible cause would be a shorted output capacitor. > > Next I would visually inspect every cap you replaced. Make sure there are > no solder bridges that might cause issues. > > It is also possible to create an open circuit by breaking a trace or a via > when you were desoldering. > > Also were there areas of pcb damage at all? > > Good luck > Steve > > > > > On Sunday, December 25, 2022, Hiraghm <[email protected]> wrote: > >> So I decided to try recapping one of my two Model 100s. >> >> The ones I replaced all looked okay, no sign of leakage; I replaced the >> batter which did have some corrosion on it. >> >> I used a Model 100 recap kit, but as the voltages didn't match on some of >> the caps, I decided not to replace those. >> >> Like a dummy, I forgot to fire it up and test it before recapping it; it >> had been working when I put it in the closet... over a year ago. >> >> >> I made sure all the polar caps were oriented correctly. >> >> I put it back together, turned it on... nothing. >> >> I flipped the memory switch on the back to "on"... turned the machine on >> and still nothing. Tried the contrast knob, no good. Tried reseating and >> wiggling the batteries (I don't have a power adapter)... nothing. But when >> I turned it off with the memory switch to on... the batt low light flashes >> briefly. >> >> >> So I killed my backup M100 :( >> >> I'm not very experienced with a multimeter, but can anyone offer an >> suggestions for troubleshooting how I killed it? What may be likely causes >> for its current dead condition? Where to start looking? >> >> >>
