I unplugged the wire and rather than doing what it normally does it just started blinking (blue light and 1 2 3) on and off, I immediately pressed up and down and it start working normally, since them I haven't be able to replicate this flashing 4 lights. Does anyone know what this might of been? I read this thread fairly regularly and haven't seen any mention of this problem.
Well I've got a guess. This (bottom lights flashing together)
has been discussed many times and has been traced in the past to
charger problems. A few days back I discussed it in some detail and reported what I thought was causing it. I can't blame you for not following it, it was in geekspeak, but it was there.
Based on the test I later reported, I think this is a part of a series of 'light shows' having to do with the exact voltage being fed the Solo. If it's 9 Volts we expect it to run using a lot of current (about 2.5 Amps in fact). If it's 12 we expect to charge using less (.65 Amps it turns out). Unless Solo could sense and switch modes we would blow up chargers trying to make them PAs. My supply was 9.2 Volts (minorly over the 9 specified). It locked out with the 'bottom lights flash' because it was seen as too low to charge, but too high for PA. Dropping my supply down to the 8.5 Volts the PA actually says on it's nameplate fixed that. So I put it on a variable voltage supply and verified the action. That's the test I later reported.
So, what I think happened is as you unplugged you got a
brief intermittent break in the connection where the
PA output voltage jumped up just enough to
trip the protect circuit (actually a software function I bet) and start the lights flashing. Turning the unit off fixed it for the obvious reason. This is, I'm sure, why the advice calls for powering up the PA after and shutting it down before plugging and unplugging. When it comes up and goes down with the load it doesn't tend to "overshoot" (the technical term for such a surge).
Do it 'backwards' and I can see it happening from time to time, but I bet it's hard to make happen on demand? I don't think there's any danger to the unit, and I bet it times out?
OF