Rockford Fosgate T1001bd

[caraudioguy2100]

Amp will not power up .

Here is what I get on the SG3526

Pin 1:4.98
Pin 2:0.00
Pin 3:4.20
Pin 4:4.74
Pin 5:4.98
Pin 6:0.00
Pin 7:0.00
Pin 8:0.00
Pin 9:3.62
Pin 10:0.00
Pin 11:0.00
Pin 12:1.29
Pin 13:0.03
Pin 14:13.30
Pin 15:0.00
Pin 16:0.00
Pin 17:13.31
Pin 18:5.01

 

[caraudioguy2100]

Does anyone have a schematic for this amp upon further inspection someone has been it it before and parts are missing .

Board number 1325-51669-06

And also looking for a pic of the whole power supply section ?

 

[Perry Babin]

Post the DC voltage on all terminals of U4 and U201.

 

[caraudioguy2100]

U4
Pin 1:0.02
Pin 2:1.34
Pin 3:13.37
Pin 4:0.15
Pin 5:1.36
Pin 6:0.57
Pin 7:0.00
Pin 8:2.49
Pin 9:0.45
Pin 10:0.15
Pin 11:1.36
Pin 12:0.00
Pin 13:1.34
Pin 14:0.13

I don’t see a U21

 

[caraudioguy2100]

Sorry misread that

U4
Pin 1:0.02
Pin 2:1.34
Pin 3:13.36
Pin 4:0.17
Pin 5:1.36
Pin 6:0.57
Pin 7:0.00
Pin 8:2.49
Pin 9:0.45
Pin 10:0.16
Pin 11:1.36
Pin 12:0.00
Pin 13:1.34
Pin 14:0.13

U201
Pin 1:0.00
Pin 2:0.00
Pin 3:0.00
Pin 4:0.00
Pin 5:0.00
Pin 6:0.00
Pin 7:0.00
Pin 8:0.00

 

[Perry Babin]

Are you sure that U4, terminal 7 is right?

 

[caraudioguy2100]

Yes Pin 7 on U4 read 0 volts I triple checked it

 

[Perry Babin]

What's the resistance between it and terminal 12 (no power applied)?

 

[caraudioguy2100]

25.42K ohms

 

[Perry Babin]

OK. Post the voltages on U9.

 

[caraudioguy2100]

U9
Pin 1:0.00
Pin 2:0.00
Pin 3:13.36
Pin 4:0.00
Pin 5:4.98
Pin 6:4.98
Pin 7:0.00
Pin 8:0.00
Pin 9:1.38
Pin 10:0.00
Pin 11:1.38
Pin 12:0.00
Pin 13:0.00
Pin 14:0.00

 

[Perry Babin]

Check R73.

 

[caraudioguy2100]

I will have to
Look at the schematic for the correct value since someone has replaced it before with a 412 ohm resistor and it reads in the mega ohms

 

[caraudioguy2100]

Ok I will have to go get a new resistor in the morning since R73 is defective

 

[caraudioguy2100]

Do yo have a pic of the area around U9 since it’s missing smd caps but the schematic says there is one supposed to be there .

 

[Perry Babin]

See attached.

 

[caraudioguy2100]

Ok I replaced R73 found a resistor of a junk board .

I get the same results amp still won’t power up .

 

[caraudioguy2100]

Ok I got the amp to power up but i’m only getting 13 volts of rail

How do I check the rail voltage on this amp correctly ?

I was using amps ground terminal as reference and touching the gate leg of the outputs

 

[Perry Babin]

Why wouldn't the amp power up?

 

[caraudioguy2100]

R73 was bad and I found some bad solder joints on a few different components.

Now the issue it with the rail voltage