Sometimes when I turn on my UPS it will beep then the yellow led will come on for a second then turn to a blinking green led,and sometimes it will beep and the yellow led comes on for a second then turn to red.I tested the battery it has a full charge @ 12.82 volts.That's good right? {battery} I am very good with electronics,I know how to trouble shoot almost anything.My old UPS blew 2 dioids and I replaced them with 2 others and it worked like new.I received the Netstar 600 not a 650,from a friend so I sold my old UPS cause I thought that this was a much better one.I did check the fuses{2}they are good, I tested them with a meter.This model was made in 12-18-98.I did plug in a small radio with no results, it works on electric and battey {radio}.It should of worked right?I did un plug the unit first.The motherboard isn't burnt out, you know how circuit boards have that weird awfull smell when they burn out?............O.K.........Plugged in the unit green led stays on solid no blinking.Plugged in to the back the radio works when the power is on. When I unplug the unit from the back {Power plug} the radio turns off and the green led turns to red no blinking.For some reason I am not gettng power to my 2 plugs on the back {Monitor and PC} I would assume.Is it possible to receive a handbook on the Netstar 600 please? And what will it cost? What I mean is a detailed printout of the interior mechanism so if there is any thing wrong with the unit I can fix or replace the faulty part. Or maby the wiring to the external plugs could be wrong?But, why would I be getting power to the plugs when the power cord is plugged in and not when the plug is out? It's not worth it to me to send the unit to a repair shop and pay someone to fix it, when I know that I can fix or replace the parts myself.

Computers & Internet - QVS - NetStar (UPS650A) UPS System