Rockford Fosgate T2500-1bd

[Perry Babin]

On the pads? Is it missing?

You should see the same voltage on the collectors of all but Q2000.

 

[caraudioguy2100]

I pulled Q2001,2010,2012 off the board .

Since the amp does crazy things with them installed .

with them off the board here is what I get on the pads for the 3 regulators

Q2001
Base:6.81
Collector:13.77
Emitter:-0.55

Q2010
Base:11.76
Collector:13.76
Emitter:0.78

Q2012
Base:11.77
Collector:13.78
Emitter:0.76

On Q2000
Base:-6.82
Collector:-26.72
Emitter:-6.26

Q2000 is the only one installed at the moment

 

[Perry Babin]

Disconnect the rectifiers again and reinstall these regulator transistors.

Is R1030 near U1000 within tolerance?

 

[caraudioguy2100]

Reinstalled the regulators
R1030 is within tolorance .
With the regulators installed here is what I get

Q2000
Base:-6.80
Collector:-27.08
Emitter:-6.56

Q2001
Base:6.80
Collector:13.80
Emitter:6.55

Q2010
Base:11.75
Collector:13.79
Emitter:11.17

Q2012
Base:11.75
Collector:13.79
Emitter:11.71

These readings are with black probe on ground terminal .

if I use the output leg of U1000 I get no readings

 

[Perry Babin]

What voltage do you have on R1030?

What's it's marked value?

If you jump R220 on the driver board, do you have drive on the output FETs?

 

[caraudioguy2100]

R1030 is a 2.7 ohm marked 2r7 it measures 2.8 ohms

with black probe on ground I get 13.85 volts on both sides of it .

with R220 jumped I get drive to the outputs

 

[Perry Babin]

R1030 is on the output of the 15v regulator (U1000), as far as I know. If that's the case, the 15v regulator has output.

Do you have an approximately 50% duty cycle drive on all output FETs?

 

[caraudioguy2100]

Yes I have 50% duty cycle on drive on all outputs

 

[Perry Babin]

It may be OK.

Do you have a 60 or 100w incandescent 120v bulb?

 

[caraudioguy2100]

Yes

 

[Perry Babin]

I've never tried it on this amp but it works on other Rcokford BD amps. Reconnect one rectifier normally and insert the lamp in series between the center terminal and the board for the other rectifier. This will provide some protection if there is a problem with the drive.

 

[caraudioguy2100]

I don’t know what changed but I do not have drive signal to any of the outputs .
Where do I go from here ?

 

[Perry Babin]

Without knowing what you've done that wasn't posted here, it's hard to make suggestions.

 

[caraudioguy2100]

when checking for drive on the outputs I see drive but very distorted waveforms . Any suggestions on what to check ?

 

[caraudioguy2100]

All the rectifiers are out of circuit right now . Do I need them in circuit to check for drive on the outputs or are they fine out of circuit ?

I noticed that with no rectifiers installed I get 0 volts on the gate legs of half the outputs . The other half of the outputs I get 7.2 volts on the gate legs is this normal ?
Q2008,2006,2014 is where I get 7.2 volts on the gate legs

 

[caraudioguy2100]

Ok I’m gonna start at this point and work my way forward . The voltages on the regulators in this amp Q2001,2010,2012 do they appear to be the correct voltages or do I have an issue somewhere ? The voltages are in post #164 . wondering if these voltages are correct or I have a problem somewhere since the voltages do not match the picture you posted

 

[Perry Babin]

Those are basically right. There are 2 12v, one +6v and one -6v.

Did you jump R220 again?

 

[caraudioguy2100]

Yes I jumped R220

 

[Perry Babin]

What's the DC voltage on the jumper?

 

[caraudioguy2100]

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