What the heck happened?


#1

Went to power up my system this evening, and failed. The P5 was on, front panel screen on, but no power to components. I checked the display, and it showed output distortion in excess of 6%. I powered everything down, checked all the connections, turn off the unit at the back, turned it back on in the back, and pushed the reset button. Voila. The only thing I can think of that was out of the ordinary today was an interruption of power that lasted about half a second earlier this evening, well before I wanted to listen, when nothing was powered. The P5 was in its normal standby mode, rear switch on, but no display or blue light on front panel. Thoughts?


#2

Just to be clear, everything is functioning normally now?


#3

Listening right now. Perfect, like nothing happened.


#4

Find a piece of wood and touch it. Maybe you just had an innocuous microprocessor hiccup.


#5

Will do. My theory is that the half-Second power outage or surge may have tripped the P5’s protection. Anyway, all’s well that ends well.


#6

Invoking a protection mode should not cause the THD out to go up like that.


#7

I’m only guessing.


#8

Invoking a protection mode should either shut down all the outputs, or by-pass the re-generator and directly connect the input to the output. A correctly functioning protection mode shouldn’t see something worse on the output than what’s on the input.


#9

Speaking for myself: I’m not taking any chances. Not in South Africa you don’t! So I have a 3Kva pure sine UPS hardwired in my DB board driving my P20 in battery mode 24/7. Soon to be augmented by at least 2x12V 200aH deep cycle batteries for longer run time.


#10

A reasonable guess.


#11

It happened again tonight. A fraction of a second power outage took place, but this time the P5 didn’t go dark. It powered on, but outputted only 113v for an input of 121v, and 6.4% THD when the input level was only 1.7%. Fixed it the same way as before: powered off the unit with the remote, threw the power switch in the back, waited a bit, resumed power with the switch, hit the reset button, and turned on the remote. It’s back to normal now, with the output showing .1% THD.