Parallel a capacitor (about 100uF) across terminals 1 and 2. Does that stop the bad channels from popping?
I have checked the voltage across pin 1-2 of the optocoupler better, i have -0.9V when is power off, when power on start up to 1.16V.
I have tryed with 100uf but no result, it's the same
C45 may be part of the delay on.
Is the voltage across this cap (just before applying remote voltage) the same when the amp pops and when it powers up quietly?
Is the voltage across this cap (just before applying remote voltage) the same when the amp pops and when it powers up quietly?
I have tried with 10k resistor on optocoupler pin 1-2, the voltage, when i leave remote in, go to 0v fastly, but the pop is still present..
Does Q9 drive the opto-coupler via the 1k 1/2w resistor?
If so, pull it and see if the pop is gone.
If so, pull it and see if the pop is gone.
Did you try lifting terminals 1 and 2 to disable the opto-coupler or did you only try shorting them?
If you rub the tip of your scope (on DC coupling, 1v/div, 2ms/div) probe around in the area of the optocoupler (both sides of the board), does the trace ever deflect from the reference.
If you rub the tip of your scope (on DC coupling, 1v/div, 2ms/div) probe around in the area of the optocoupler (both sides of the board), does the trace ever deflect from the reference.
Confirm that you had absolutely no pop on any channel, no matter what with terminals 1 and 2 shorted?
Lift 1 and 2 and retest for noise.
Lift 1 and 2 and retest for noise.