Orion XTR4000.1D No Audio Help.

[rhempz01]

i could use some help with this amplifier. Starting with the power supply. The gate drive past the resistor doesnt look right. the photos are of each side, pre resistor and at the leg of the mosfet.
271ohm per gate?
rail, and regulated present.
+-135vdc
+-12.5vdc on the op amps.
3.2amps of current at idle.
Seems to be running ok, just no audio
.

 

[rhempz01]

pcb

 

[rhempz01]

pcb 2

 

[rhempz01]

pcb smd values. for the forum refference

 

[Perry Babin]

270 ohm gate resistors? Are they original. That's seems like it's too high by a factor of 10 unless there is a LOT of deadtime programmed in.

The gate waveform isn't necessarily bad but if your scope is actually on DC coupling and the ground level indicator is accurate for ch1, the drive-side signal is odd, being so far below ground.

 

[caraudioguy2100]

These amps have 270 ohm gate resistors from the factory .

I just repaired one and also noticed the gate resistors but they come that way from the factory .