Hey Perry I got another one T30001bd amp in. I rebuilt the powersupply and the audio board. When HV is not connected and only the ribbon cables are, I get a drive signal only on 2 of the 4 banks. Checking the signal on pin 7 of u301 and u302 they are both almost undetected or distorted. I placed a 1k ohm resistor across pin 1 & 2 of u301 and got a clean square wave. No I have drive signal on all 4 banks. I also had the correct waveforms on u400 and u401. I did power the amp the banks did not share the voltage on outputs.
Did you try connecting the rail voltage wires? If you're concerned about high current draw, insert a 120v lamp in the red/blue wires to act as a limiter.
Was the rail ground wire (white) connected?
Was the rail ground wire (white) connected?
I did connect high voltage wires and it didn’t share the voltage still. I did put audio through it and it would go in and out of protect with audio on it no load of course
The voltage, positive and negative may not be perfectly equal.
The inductor could be shorted. Try twisting it while the amp is trying to go into protect. I'd use a limiter so the outputs aren't getting stressed if the problem is over-current related. Having broken legs on the filter caps can also cause the amp to go into protect.
When you tested with no rail voltage, did you have a 50% duty cycle drive signal?
The inductor could be shorted. Try twisting it while the amp is trying to go into protect. I'd use a limiter so the outputs aren't getting stressed if the problem is over-current related. Having broken legs on the filter caps can also cause the amp to go into protect.
When you tested with no rail voltage, did you have a 50% duty cycle drive signal?
I also had the correct waveform on the ic out drive for the coil on both sides but only after i installed the resistor on the feedback loop
Do you get modulation of the drive signal (no rail, feedback resistor in place)?
You may need to go to a 10k resistor.
You may need to go to a 10k resistor.
Get out of the bad habit of using the gain to adjust the level. Use the signal source.
The modulation causes the pulse width to vary as the signal changes in amplitude.
The modulation causes the pulse width to vary as the signal changes in amplitude.
I replaced the switches and gain pot since these are known issues. I removed the 1k resistor off the feedback loop and lost m all the drive signals. I started tapping on the circuit board around rcas and got the drives back. Going to reflow the ops pa conncections.
I don't see anything wrong with the drive.
You should not have a problem getting drive with an RCA problem. This is a clocked amp and will oscillate at the frequency of the integrator as long as the output stage is enabled.
You should not have a problem getting drive with an RCA problem. This is a clocked amp and will oscillate at the frequency of the integrator as long as the output stage is enabled.
After I resolve red all the opamps the drive signals were all there with resistor removed.
I power the amp and the banks are not sharing still but the protect light comes on and off no audio signal in
I power the amp and the banks are not sharing still but the protect light comes on and off no audio signal in
Sorry that was resoldered. Seems that’s if I had a problem with my driver circuit that I wouldn’t see the drive circuit on all 4 banks is that correct?