Rockford Fosgate P1000-1BD

[caraudioguy2100]

Im only getting rail voltage on half of the outputs .

Q2011,2014,2008,2006 have no tail voltage on any of the legs .

Any ideas ?

 

[Perry Babin]

Broken trace/via between the negative rectifier and the transistor source leg?

 

[caraudioguy2100]

Wondering if it’s defective .

On the outer legs I get 31 volts middle leg I get 0 volts

 

[Perry Babin]

If 'what' is defective?

Positive 31v?

Did you check for continuity from the negative rectifier to the source legs?

Do you have another junker of this basic type to confirm that you should have a 0 ohm connection between the negative rectifier and the source legs?

 

[caraudioguy2100]

Well that explains why the amp has no negative rail voltage .

The outputs are blown which my meter must be dying since they tested good the first time around .

 

[Perry Babin]

To clarify, These amps have only one rail. There is no fixed positive or negative rail voltage that you can measure. You have to measure across the rectifiers to know if they have rail voltage.

 

[caraudioguy2100]

Replaced the defective outputs and I still only get rail voltage on 4 out of the 8 outputs .

Q2011,20142006,2008 have no rail voltage .

I measured across the rectifiers and have 63 volts of rail

 

[Perry Babin]

Did you check for a 0 ohm connection between the rectifier and those FETs?

 

[caraudioguy2100]

Yes and I have 0 ohms between the rectifiers and outputs

 

[Perry Babin]

Then, I'd recommend pulling the rectifiers (or at least the center terminals) and check the drive signals. Post a photo of the BD driver board.

 

[caraudioguy2100]

Here is the output board .

If you need pics of the front side let me know and I will
Pull the card

 

[Perry Babin]

Solder a jumper as shown below. Do you have good drive on all output section FETs?

 

[caraudioguy2100]

Placed the jumper as shown .

I don’t get drive signal on any of the outputs .

 

[Perry Babin]

Do you read 0v DC across all of those FETs measured gate to source (black probe)?

 

[caraudioguy2100]

Red probe on gate black probe on source .

Yes all of them read 0 volts

 

[Perry Babin]

Do you see signal on any of the terminals of the bd driver board?

 

[caraudioguy2100]

No

 

[Perry Babin]

Do you have the correct output voltages on the SMD regulators near the driver board?

Are the solder connections good or do they appear to be damaged from heat?

 

[caraudioguy2100]

I have + - 14 volts going into 2 and +- 19 volts going into the other 2

Coming out I have -15 coming out of 2 and -27 on 1 and 20 volts on the other

 

[Perry Babin]

Like this (below)?

Do you have regulated voltage on the op-amps on the driver board?