Rockford punch 400.4

[shanecapetown]

Hi guys does anyone have schematic on this amp i got it like this from previous repair

 

[Osvaldo de Banfield]

Manufacturer? Model?

 

[Perry Babin]

If this isn't it, post the PC board #.

If that's dirt on it, I'd give it a good bath before working on it.

 

[shanecapetown]

Yes perry very dirty

 

[shanecapetown]

Hi guys i got to actually working on the amp doing one channel at a time but amp pulls excess current with outputs in

 

[shanecapetown]

Outputs heat up fast

 

[Perry Babin]

Are the bias pots fully CCW?

 

[shanecapetown]

I adjusted it slowly and it seems to draw less current but not much less

 

[shanecapetown]

It draws 13.5 amps when i adjust it, it draws 11.8 amps

 

[Perry Babin]

Which channel is heating up?

 

[shanecapetown]

Ccw its 13.5. Cw its 11.8

 

[shanecapetown]

Right front

 

[Perry Babin]

Well, that narrows it down. There is likely something wrong with the drive circuit.

 

[shanecapetown]

So i should probably remove outputs and drive sine wave into amp and check

 

[Perry Babin]

I would simply check the various resistors and transistors that drive the outputs. You can't check class AB drive signals with the outputs out of the amp like you can class D drive signals.