Let the voltage keep climbing on pin 6 to see what happens when it exceeds the voltage on pin 5.
What's the output voltage on the 5v regulator near the low-voltage transformer?
What's the output voltage on the 5v regulator near the low-voltage transformer?
This has been a long thread but the title says that the duty cycle becomes excessive. What is that based on?
Just the noise?
Just the noise?
You can see the power supply PW just continue increasing on the oscope the longer you leave the remote on, the noise I hear happens at the same time PW reaches maximum and starts ‘vibrating’ rapidly.
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It’s not behaving normally, switchmode supplies are not supposed to screech and display unstable PW behavior. Also the input current should not just rise and rise, it should level out around 1.5~2A at idle.
It should not squeal. Agreed. Are you sure that the drive to the PS FETs is right?
What's the rail voltage (positive and negative measured at the rail caps) when you stop allowing it to power up?
Is the DC on the rail caps (positive and negative) clean when you look at it on the scope?
What's the rail voltage (positive and negative measured at the rail caps) when you stop allowing it to power up?
Is the DC on the rail caps (positive and negative) clean when you look at it on the scope?
Rails slowly climb to +/-40v, at which point it starts making the squealing. Actually it sounds more like white noise, but regardless it can’t be right based on what I’m seeing. DC is clean on the scope.
Follow pin 1 of the PS driver board back and check every component between pin 1 and both the positive and negative rails.
It's not that simple, from what I remember. It has to sense both the positive and negative rail. I think it's something like the following Rockford regulator but I think I remember diodes in it. I'm sorry that I don't remember more about it but I never had much trouble with the regulators other than the things I asked you to check.
