What would cause the ps to run at +40%/-60% duty cycle. What ever the issue us it's not on the driver card. When I put it into a different amp it works fine. The signal is like that directly off of the chip even so I'm confused.
If this is a standard push-pull power supply, the max duty cycle is 50%. Post a photo of the drive waveform.
Either of those will increase the deadtime when above 0v.
What model is this amp?
Which PS driver board are they using in it?
What model is this amp?
Which PS driver board are they using in it?
If you're 100% sure that the driver board isn't the problem, I'd compare the voltage on the header pins as well as the voltages on the 494 to see if you can find what's different.
Are the amps the same make/model?
Are the amps the same make/model?
So I got the ps working but I have an issue with the output section. Even with no output fets it blows the 21844s chips every time I let off the remote.
Are the 21844s from a reputable distributor?
Is the initial mute/delay circuit working to disable the IC during power up/down?
Is it blowing the outputs?
Is the initial mute/delay circuit working to disable the IC during power up/down?
Is it blowing the outputs?
I only buy from mouser and digikey.
It appears to happen the moment I let off the remote. Every leg that should be at zero jumps to negative rail.
The outputs are removed
It appears to happen the moment I let off the remote. Every leg that should be at zero jumps to negative rail.
The outputs are removed
Post a good quality photo of the component side of the entire main board and the component side of any driver boards.