Lanzar 6000d

[megael9]

This amp comes On, and power supply looks ok to me, but no audio output at speakers terminals. Is this amp in protection mode. ( mute mode)?
Thank you

 

[Perry Babin]

What output driver board is it using?

 

[megael9]

Picture

This one

 

[Perry Babin]

Are you getting audio to the driver board?

Do you have rail-rail oscillation on the outputs?

Do you have ±rail and regulated voltages?

Diagram for a similar amp if you don't have one:
http://www.bcae1.com/temp/soundstreamxxx6500.zip

 

[megael9]

I looks like there's audio at the driver board input, but very low.
There is a oscillation at the positive speaker terminal, it happens
Every other second. Is this a bad coil?
+- 132 volts rail to rail are Ok.

 

[Perry Babin]

The rail-rail oscillation at the output transistors would swing ±130v at about 80-100kHz. Is this what you're seeing at the output transistors as well as at the speaker terminals?