Rockford Fosgate T2500-1bd

[Perry Babin]

Yes.

 

[caraudioguy2100]

I do not see audio on pin 1 of the driverboard

 

[Perry Babin]

I think you likely have a dirty switch or pot.

 

[caraudioguy2100]

So I have to unsolder them from the board and take them apart correct ? These are sealed switches and I cannot spray contact cleaner in them

 

[Perry Babin]

Check for audio or resistance between pins that are supposed to be connected in each position.

 

[caraudioguy2100]

I get 0.3 ohms between the pins of the switches . I do not see any audio on any pin of The phase switch

 

[Perry Babin]

Do you have audio on the master/slave switch?

Isn't this the amp that had the 7k signal problem?

If so, what happened with that?

 

[caraudioguy2100]

I rebuilt the output driverboard and the 7k signal went away . I have audio on some of the pins of the master slave switch . 1 row I see audio on the pins the other row I don’t see good audio on the same pins .

not sure if this is normal for this amp or not but on U106,107 that sit behind the switches I get 13 volts on pin 1 of both opamps

 

[Perry Babin]

DC voltage on all terminals of U106?


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:

 

[caraudioguy2100]

Pin 1: 13.33
Pin 2:13.31
Pin 3: 0.00
Pin 4: -15.15
Pin 5: 0.00
Pin 6: 0.00
Pin 7: -0.07
Pin 8:13.32

I also noticed U106 gets very hot to the touch

 

[Perry Babin]

Why did you say that those switches were sealed? The ones in the photos I have are not.

Post a photo of the master/slave switch in your amp.

Slide R137 off of its pads. Do you still have DC volltage on pin 1 of U106?

 

[caraudioguy2100]

Yes I still have voltage on pin 1.

here’s a pic of the switches

 

[Perry Babin]

The op-amp appears to be defective. With R138 in place and within tolerance, the voltage on pins 1 and 2 should be the same as on pin 3.

Those switches are in no way sealed. If you drop DeOxIt into the holes in the top of the switch, it will flow through the switch.

 

[caraudioguy2100]

I will replace U106

I noticed I also get 13 volts on pin 1 of U107,U101 is this normal or could they also be defective ?

 

[Perry Babin]

One step at a time.

 

[caraudioguy2100]

Replaced U106 no change still have 13 volts on pin 1

 

[Perry Babin]

Is R137 out of the circuit?

Is R138 within tolerance?

 

[caraudioguy2100]

When I replaced U106 R137 was out of circuit . And I still have 13 volts on pin 1 . R138 measures fine .

just so no confusion is R137 the top or bottom resistor ?

 

[Perry Babin]

R138 connects between pin 1 and pin 2.

Is pin 3 still at 0v?

 

[caraudioguy2100]

Yes pin 3 is still at 0.00 volts