Rockford Fosgate T10001bd

[caraudioguy2100]

Amp will not produce rail voltage .

Amp has regulated voltages but no rail voltage .

Any ideas ?

 

[Perry Babin]

Did you measure with both meter probes on the center legs of the rectifiers?

 

[caraudioguy2100]

Ok it’s producing rail voltage .

Amp has no output

Any ideas ?

 

[Perry Babin]

Have you operated all pots and switches through their entire range while listening for audio to see if it every played through (even just for an instant)?

With a speaker and signal source connected, did you operate all pots and switches in all combinations to see if any audio/static/noise ever played through?

 

[caraudioguy2100]

Yes moved all switches and pots through entire range several times .

The test speaker never made any noise .

 

[Perry Babin]

Do you have rail-rail oscillation?

 

[caraudioguy2100]

No

 

[Perry Babin]

What's the PC#?

 

[caraudioguy2100]

1325-51669-06

 

[Perry Babin]

Do you have a triangle waveform on pin 5 of U203?

 

[caraudioguy2100]

No

 

[Perry Babin]

Do you have a triangle waveform on pin 1 of U2?

If not, post the DC voltage on all terminals of that IC.

 

[caraudioguy2100]

I get a triangle waveform now on pin 5 of U203

I also get a triangle waveform on pin 1 of U2

I had a broken solder connection on pin 5

Amp still has no rail to rail oscillation

 

[Perry Babin]

DC voltage on pin 1 of U203?

Waveform on pin 7 of U203?

 

[caraudioguy2100]

Pin 1:4.27

Pin 7 just deflects as seen

 

[Perry Babin]

Bridge terminals 1 and 2 of U200 and recheck those points.

Do you have ± regulated voltage on these op-amps?

 

[caraudioguy2100]

U200
Pin 4:-5.95
Pin 8:5.78

U203
Pin 4:-5.96
Pin 8:5.79

U203

Pin 1:0.00

Here is what pin 7 looks like now

Scope set to 2us 5volts/div

 

[Perry Babin]

Is there any DC offset across the speaker terminals?

 

[caraudioguy2100]

No

 

[Perry Babin]

Do you have r-r oscillation, now?