I don't understand what this waveform in the attached photo is telling me.
It has a significant dip in the top before it pulls down. This bank is heating up with a 2ohm limiter but i do have the fets clamped similar to what you have recommended in the past with a binding clip and an old clamp from a kicker.
Its taken from the Gate of IRF3205 Q16A. It drives the transformer that has the additional winding for the 15V regulators.
The probe is grounded to the source leg.
Photo #2 shows the waveform I am seeing on the gate of the other banks driving different transformers.
It has a significant dip in the top before it pulls down. This bank is heating up with a 2ohm limiter but i do have the fets clamped similar to what you have recommended in the past with a binding clip and an old clamp from a kicker.
Its taken from the Gate of IRF3205 Q16A. It drives the transformer that has the additional winding for the 15V regulators.
The probe is grounded to the source leg.
Photo #2 shows the waveform I am seeing on the gate of the other banks driving different transformers.
Attachments
I suspected that. The originals were marked ZL. Quick search showed they were BL Galaxy Electric 2sb1260. I Have Rohm 2sb1260's marked BE that i tried HFe rank R. I will try HFe rank Q.
Post the base signals of both drive sections from the waveforms you posted and the emitter waveform for the waveform on the left above.
These are on the driver transistors.
These are on the driver transistors.
Correct me if I am wrong but according to the datasheets the pinout is different from the originals?
I spoke to soon. I checked the waveforms on the transformer windings going to the rectifiers. The bank is still running hott i think. The transformer is putting out 75v AC. The other banks are 73 and 72v ac. I checked the other side and all transformers are outputting 72v ac. I dont trust my sense of touch im going to use a thermal image camera to confirm.
Should all the AC voltages combined at the rectifier be the same?
Should all the AC voltages combined at the rectifier be the same?
Attachments
Do you have one FET gate leg that's different?
Do you have one of the diodes that clamps spikes that's shorted or leaking?
Small differences like noise or ringing can cause a slight difference of voltage.
Do you have one of the diodes that clamps spikes that's shorted or leaking?
Small differences like noise or ringing can cause a slight difference of voltage.
Don't use hot air to install anything. I don't even use it to remove parts. The only good thing I found to use it for is to remove/install terminals block or other high-mass parts.
Lesson learned all that time spent because i was too lazy to use soldering wick and an iron. I only used it for removal never had any regard for the surrounding parts. Definitely was the hot air gun i want to throw it in a bin and not touch it.
I am down to 1.2amps idle current from 1.8amps and power section running smooth.
I don't have the confidence yet so i like to have you walk me through things and go back and read up.
Thanks again Perry.
I am down to 1.2amps idle current from 1.8amps and power section running smooth.
I don't have the confidence yet so i like to have you walk me through things and go back and read up.
Thanks again Perry.
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