Audiopipe AP 3000 1D

[caraudioguy2100]

Amp has 73 volts on the output terminals .

All of the outputs are new and replaced the drivers as well .

3 banks of drivers have 80 volts of rail on them the fourth bank the drivers only have 12 volts on all of the pins .

Any ideas what might cause this ?

 

[Perry Babin]

Post a photo of the output section of the amp.

 

[caraudioguy2100]

Here are some pics let me know if you need more

 

[Perry Babin]

What do you mean by 3 banks of drivers? As far as I know, these amps only have one set of drivers for each of the two banks of outputs.

 

[caraudioguy2100]

There are a total of 4 banks of fets there are 2 boards strapped together like 2 1500 boards strapped together unless I’m wrong .

On 1 of the boards there is 4 outputs on 1 side of the board and 4 outputs in the other side of the board same with the other board

1 set of drivers measures rail voltage the other side the drivers only measure 12 volts on all pins

 

[Perry Babin]

OK. I've never heard of anyone treating this as one amp.

I'd suggest that you remove the rectifiers from the damaged half to troubleshoot the drive problems. After removing the rectifiers, you can more easily see the drive signals.

Do you have a scope?

Your unused sig line would be a good place to list all of the test equipment you have, including the power supply you use.

 

[caraudioguy2100]

Does that opto coupler have anything to do with the rail voltage ?

I see a diode that directly connects to the rectifier I get 0.04 ohms between the diode and the rectifier but get no rail voltage on the diode

 

[Perry Babin]

Are the rectifiers in or out of the circuit?

Everything should have a circuit board designation. You need to specify which components you're referring to via those designations.

 

[caraudioguy2100]

This amp uses STP65N06 as the power supply fets with 47 ohm gate resistors

I have mixed matched fets in it right now for testing since the originals were shorted .

Can I use the IRF3205’s in his amp as replacements ?

I’m working my way back to the drive problem so wanted to rebuild the power supply

 

[Perry Babin]

That's what I use (3205s with 47 ohm resistors).

The supply only has to be working at a very basic level to continue troubleshooting the output section.

 

[caraudioguy2100]

Ok power supply is set .

Right now the rectifiers and outputs are out of the amp .

Where do I go from here ?

And yes I have a scope

 

[Perry Babin]

Install the outputs. Until you get the amp producing good rail-rail oscillation on the outputs, you can disable the other half by disconnecting the remote that's jumped to it.

 

[caraudioguy2100]

Ok new outputs and drivers installed .

Rectifiers are still out of the amp

 

[Perry Babin]

Do you have a scope?

 

[caraudioguy2100]

Yes I have a scope

 

[Perry Babin]

Confirm that all 3 5v regulators in the output section have 5v out. Place the black probe on the tab of the regulator for each individual regulator.

If all are OK. Confirm that all rail caps are discharged. If they are discharged, you can check the drive for each bank of outputs with the ground of the scope on the source leg of the bank being tested.

 

[caraudioguy2100]

This is what I get on both banks of outputs .

Scope settings are 2us 2 volts/div

Not sure why the pics keep flipping sideways

 

[Perry Babin]

Are you sure that the scope is set to those settings?

I'd expect this is it was wet to 10uS and 5v/div.

 

[caraudioguy2100]

Rechecked the settings and yes this is at 10us 5 volts did you were correct .

 

[Perry Babin]

That looks OK.