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Old 29th May 2015, 01:30 PM   #1
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Default Rockford Fosgate type RF-X6

Hello everyone
Again here with this amplifier, which produces some doubts ...

Opening it, I found three power FETs, charred, specifically the right of the first picture.
I checked the other three, and look good, I checked several more components, drivers, resistors, and look good, too.

I installed three new fets feeding (picture two) at the site of the charred, I connected the cable remote, and no, I have also connected the oscilloscope, at the gate of the FETs of the first group on the right, (photo three) and the second group is below (picture four)

My question is: What do you think of the waveform of the picture three is it normal that at the bottom have a triangular shape?
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Old 29th May 2015, 01:42 PM   #2
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Remove B+ and look at the drive signals on all PS FETs. Are they all identical?
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Old 29th May 2015, 01:52 PM   #3
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I, when I made these measurements, at no time have connected the B + perry ...
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Old 29th May 2015, 02:00 PM   #4
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It looks like the PNP drivers are defective. Did you have the scope set as suggested in the 'best initial settings' section of the oscilloscope page of the site? #73 in the directory.
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Old 29th May 2015, 02:04 PM   #5
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I'll review them, and yes, you may not be properly adjusted the scope, although the two waveforms, I used the same setting ...
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Old 29th May 2015, 03:42 PM   #6
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Again, Perry, you were right, there was a driver that was open, so I spare the waveform now looks great (see picture), oh, and I adjusted the oscilloscope!

I connected the B +
I connected audio input
I connected a speaker output

The sound seems good (maybe a bit distorted ...)

But without volume, without audio, background noise on the speaker, as a high-frequency hiss ...
In the audio output with the settings, I have 0,136 volts, is this normal?
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Old 29th May 2015, 10:08 PM   #7
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Can the noise be heard through a subwoofer?

In the future, use DC coupling, not AC coupling. If there was still a question as to whether the drive signal was OK, you'd have repost the waveforms.
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Old 31st May 2015, 02:08 PM   #8
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No, I tried it with a normal speaker, full range, therefore, the noise is more noticeable ... anyway, after 10 or 15 seconds, then connect the amplifier, noise, lower half. ..

Just try it with the woofer, my home cinema, and the hiss, it is virtually nil.
Again, thanks for the help, Perry.

And yes, I will adjust the oscilloscope in DC for my next measurements.
I still have a way to go, with oscilloscope ...
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Old 31st May 2015, 11:55 PM   #9
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On the scope page, I've added a printable 'cheatsheet' for the scope.
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