Rockford Fosgate P6001bd

[caraudioguy2100]

Replaced U200 no change amp still had very distorted output increased current draw and the short led is still lit

 

[Perry Babin]

Are the voltages on U200 identical with pins 1-2 bridged.

 

[caraudioguy2100]

U200 with no bridge

Pin 1:0.85
Pin 2:4.18
Pin 3:4.19
Pin 4:-5.88
Pin 5:0.05
Pin 6:1.74
Pin 7:-2.43
Pin 8:5.76

U200 with pins 1-2 bridged

Pin 1:4.30
Pin 2:4.30
Pin 3:4.32
Pin 4:-5.90
Pin 5:0.05
Pin 6:4.33
Pin 7:-4.22
Pin 8:5.77

 

[Perry Babin]

What's the DC voltage on each terminal of R215 (black on primary ground)?

Is R215 within tolerance?

 

[caraudioguy2100]

R215:0.906k

4.22
4.27

 

[Perry Babin]

It appears that you have an open ground. That resistor should read 0 ohms to ground on one terminal.

What is the resistance between the speaker ground and the primary ground?

I've attached the schematic diagram. What other points marked as ground are not 0 ohms to the speaker ground?

 

[caraudioguy2100]

7M ohms from speaker negative to power ground

 

[Perry Babin]

Do you see any burned traces, top or bottom?

 

[caraudioguy2100]

I removed the board from the heatsink I see a coupe of burnt traces .

I will repair them but I don’t think that’s the entire problem.

I will post back as soon as I repair the traces

 

[caraudioguy2100]

Repaired the trace on the bottom of the board .

Amp plays clean output but very low .

If I turn the gain up the audio will cut in and out and the thermal led blinks on and off

 

[Perry Babin]

Did you remove the 1-2 bridge?

 

[caraudioguy2100]

Yes

 

[Perry Babin]

What happens to the output with no load?

 

[caraudioguy2100]

With no load

I get a pulse of dc about 1 volt when moving the gain knob back and fourth

 

[Perry Babin]

Did you try cleaning it?

Without turning the gain pot (never use the gain pot as a volume control when testing, use the signal source level instead), with the gain pot full clockwise, what does the amp do?

 

[caraudioguy2100]

With the gain fully clockwise the audio cuts in and out and the the thermal led flashes

 

[caraudioguy2100]

Ok I found the issue .

Somehow there was a solder bridge between C234 and R233


Amp works like it should now