FSD 5000D dc on speaker terminal

[mnhiphop101]

I have 112vdc on the speaker terminal. When I use my scope is plays a clean signal but if I hook a speaker up the cone shoots out due to the dc I'm assuming. Does it have anything to do with the pots in the pic?

 

[Perry Babin]

If the amp is on but no signal, does the amp produce the DC or is it only when you drive the amp to a certain level with signal?

 

[mnhiphop101]

Yes with or without signal

 

[Perry Babin]

Do you have a 120v incandescent lamp that you could use as a load?

115v of DC may blow it so you might need to use 2 in series.

 

[mnhiphop101]

Yes I do

 

[Perry Babin]

Does using that as a load cause the amp to produce DC across the speaker terminals?

 

[mnhiphop101]

Yes, the dc is still there

 

[Perry Babin]

If you repeatedly make/break the connection with the load, how far back in the circuit does the DC offset show up?

 

[mnhiphop101]

It's on the fets. The low side has -rail on all 3 legs
On the high side I have neg rail - pos. Rail - neg. Rail

 

[Perry Babin]

How far back in the drive circuit does the problem go back?

 

[mnhiphop101]

It was on the driver transistors. I was checking the card and my probe slipped so now I have a new issue to deal with. I will check it out tomorrow and report back.