Rockford Fosgate BD15001 stuck in protect

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What work have you done to this amp?

Post the DC voltage on all pins of that IC.

U21
Pin 1: 8.76 vdc
Pin 2: .771 vdc
Pin 3: 8.18 vdc
Pin 4: -0.029 vdc
Pin 5: 4.99 vdc
Pin 6: 8.21 vdc
Pin 7: 1.230 vdc
Pin 8: 9.64 vdc


I checked the drive circuit and all looks very nice, very nice crisp square form, and checked the ohm readings between first and last gate legs in all pairs all read 20 ohms.

Checked ohm reading from last leg of Q101 to positive speaker terminal, and it read 0.1 ohms. Wiggling the output inductor coil makes no change.

I checked the waveform on pins 1 and 7 of Ull and they are identical like a heart beat on the EKG again, no triangle or square like they shouls be.

So far thats all I have done i was going to run a sine wave and look at the output signal on pin 1 of U4 but have not got that far.

The board looks like new no dust, no repairs, absolutely immaculant.
 
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