Tweet
I have one PV 2600, it burnt 2 channel, now I repair channel 1, but I can't fix channel 2. when I install driver transistor Q0106, Q107, and check voltage +/-1.25V on B leg. After that I install Q108 and Q112, it's ok, the voltage on B leg is +/-0.5V,then I test music with it, it ok, next I install Q109 and Q113 and turn on, I check voltage again, voltage on B leg is +/-0.5 then it increase fast to +/-0.75 so amplifer is very hot, I see the ampe meter about 4A and R154 burnt. sometime it's no increase, when I install 4 pair transistor output Q108-Q115, and I turn on amplifier, the voltage on B leg is +/-0.75 and channel very hot, R154 burn. Maybe amplfier only run with one pair. please hepl me to resolve that problem.
-
-
If R154 burns out, your amplifier must be oscillating. Do you have a scope?Education is what you're left with after you have forgotten what you have learned. -
PV 2600 schematic
Here is the schematic for those of you who want to follow along at home.
Comment
-
Thanks Enzo, I test with my oscilloscope, it's oscillating. But i don't know what reason? I check voltage from 7 pin IC U100. it's + 0.5V and I check R, C feedback R111, C112, R112, C106, it's ok, I don't know why it's oscillating? How to limit that prolblem?Originally posted by Enzo View PostComment
Comment