Rockford Fosgate 100DSM

[caraudioguy2100]

Amp powers up and produces +- 32 volts of rail and is producing regulated voltages .

Amp has no output .

Any ideas everything I’ve checked so far tests good

 

[Perry Babin]

Do the bias pots increase the idle current if you rotate them clockwise?

Set the one(s) you turned fully CCW if they do not.

 

[caraudioguy2100]

Neither bias pot increases the current draw .

I set both of them fully counter clockwise

 

[Perry Babin]

DC voltage on terminals 8, 9 and 14 of the LM339?

 

[caraudioguy2100]

Pin 8:2.60
Pin 9:3.38
Pin 14:3.79

 

[Perry Babin]

C104 is likely leaky.

 

[caraudioguy2100]

Do you happen to know the value ?

I don’t have a schematic for this amp

 

[Perry Babin]

I'm sorry. That should be C14 near the PS driver board. 10uF @ 16v.

See attached.

 

[caraudioguy2100]

I replaced both C14 and C15 amp works loke it should .


Thanks again greatly appreciate it

 

[Perry Babin]

It's likely that all of the 10@16v SMD electrolytics need to be replaced.