Powerbass xa3000/DLM4000 driver
 

Info on this pcb, anyone? I get no oscillation on the output fets.
http://img.tapatalk.com/a6fae314-f6f2-ce89.jpg

i think its a old topic i found about these. which card is this?

DLM4000

what output fets it use?

IRFP360

If you drive a strong signal into the amp, do you see any audio at the input to the driver board?

Do you see any signal (at the audio frequency) at the input to the driver IC?

I have signal at the board, nothing on pin 12 or 14 of the IR2110(ir2113) IC. The input signal goes into the DLI4060A IC first. I hope that isn't the issue.

I have a nice square wave on the gates of the outputs, just no audio out.

With the FETs in the circuit, do you have a high frequency (not at the audio frequency being driven into the the amp) rail-rail square wave on the outputs and on the output filter inductors?

Can you see the pulse width of the high frequency waveform changing when you drive audio into it?

Do you see audio at the output filter inductors before the relay?

Is the relay engaging?

All the fets are in the circuit I see high frequency square wave when I have a signal input. If I adjust the gain or level from the source it will go into protect.

Before the protect trips I get a glimpse of audio at the relay. The relay isn't engaging, the coil is open.

You'll have to determine which protection circuit is shutting it down. Do you see any DC or a spike in current as it goes into protect?