Its just for curiosity, my quad is working fine now, but I measured in the scope the PPM output from APM to ESC and I noticed that its is arround 3V, is it common? shouldnt it be 5V?
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The 5-volt spec used to be where all servos operated, but that is no longer the case. Somewhere along the line, once CPU products went to 3.3-volt levels, so to did the servos. There are no real specifications for RC equipment and no governing body to enforce them if there were. Don't worry about the 3-volt level; modern servos will work with that just fine. Take a look at modern receiver outputs while you have your scope warmed up and you will see the same 3.3-volt levels. I know this is true on Spektrum equipment, and I imagine it will be that way on JR, Futaba, and other big name brands.