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Old 16th May 2018, 03:59 PM   #1
josesony68 is offline josesony68  Spain
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Default rockford fosgate t1000-1bd

I just repaired this amplifier, but I have a doubt ..

All the Fet's of the power supply, were short and also two resistors gate.

Also one phase of the audio output stage, had failed (Q2013, Q2015 and Q2014, Q2011) and a Q2016 driver

All this has been replaced.
The amplifier tested and has a correct operation.

But the waveform on the Q2103 and Q2015 gate pins is the one shown in the photograph, is this normal?
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Old 16th May 2018, 04:07 PM   #2
Perry Babin is offline Perry Babin  United States
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Since you have a battery power (isolated from the mains, no charger plugged in...) scope, place the black probe on the source and the red probe on the gate.
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Old 16th May 2018, 06:59 PM   #3
josesony68 is offline josesony68  Spain
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the result is the same, Perry ...
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Old 16th May 2018, 07:16 PM   #4
Perry Babin is offline Perry Babin  United States
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Did you check the drive signals without the rectifiers?
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Old 16th May 2018, 09:06 PM   #5
josesony68 is offline josesony68  Spain
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No, I did not do that, tomorrow I extract them and check the waveform without them.
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Old 16th May 2018, 09:40 PM   #6
Perry Babin is offline Perry Babin  United States
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If you're careful, you may be able to only lift the output terminal to save time.
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Old 16th May 2018, 09:47 PM   #7
josesony68 is offline josesony68  Spain
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I am assuming that with rectifiers it refers to the output fets ... ?
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Old 16th May 2018, 09:55 PM   #8
Perry Babin is offline Perry Babin  United States
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Sorry. It's referring to the rectifiers. The output is the center terminal.
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Old 23rd May 2018, 01:42 PM   #9
josesony68 is offline josesony68  Spain
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I raised the output pins of the two rectifiers corresponding to Q2013,2015, 2014,2011, but there was no luck, I was looking for waveforms from this state, but something happened ... Q2013 and Q2014 went short.

I replaced the four FETS, soldered the pins of the rectifiers, and the waveform is still the same as before.

I'm going to re-test the amplifier, with audio on the input and a woofer on the output, at 80% of its performance for two hours, to see what happens ...
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