For the one that beeps, and has led flicker... If beep then 5V is probably up. If no lcd then check -5v.
I suspect a problem with -5v because no LCD and the low voltage led might suggest that -5v is struggling and pulling a lot of current. If you are lucky when swapping caps, the pcb connections stay intact. If unlucky, you can break connections when you pull the original cap. I rely on my microscope to really see what is going on. Good luck. Steve On Sunday, May 19, 2024, Jim Williams <[email protected]> wrote: > I recapped my two M100s. > > The first one required some flux-cleaning and then worked fine. So I put > it on its shelf, and recapped the second one. > After, the second one was completely dead; no battery light, no sign of > life whatsoever. > I took it apart again and thoroughly cleaned it with alcohol because I'd > been told that excessive flux could be an issue. > I also checked all the capacitors and the battery to ensure that they were > all soldered properly. They all appear to be so. > > After reassembly, it was still just as dead. > So I returned to my first M100, intending to install a RexCPM into it. > Before doing so, I flipped it on, and the low battery light came on... and > nothing else. > I replaced the batteries with new ones... and all that happened was the > low battery light flickered as I turned it off. > I adjusted the contast knob, just in case it was something that simple, > but to no avail. > > So I put it back on its shelf to deal with another day, saddened that I > now have no functioning M100s; that I killed them. > A few hours later I took it off the shelf... still the battery light > flicker, but, I accidentally pressed several of the keys. > Whenever I press a key, I get a beep. > > Can anyone with more experience advise me on how to further investigate > what could be wrong with my machines? At this point, I'll settle for one > working. > >
