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Old 3rd October 2012, 08:32 PM   #1
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Default Spl dynamics EXT2000d

Hello!
I need an advice.
I have broken d-class amp. It produces a noise (frequency near 5k). And coils in output filter becomes hot.

I disconnected preamp (all opamps). Noise is not stopped. All mosfets were desoldered and tested. They all are OK.

The amp is old.

Here is the schematic.
http://www.bassclub.ru/forum/attachm...7&d=1268986195
Thanks!
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Old 4th October 2012, 08:38 PM   #2
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I take an oscilloscope and find distorted squarewave at gates of irf064.
So I find not soldered pin 10 of Tl494. I will solder it tomorrow.

The amp was in service. And TL494 was changed. There are a lot of gumboil. I think serviceman was lowqualified.
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Old 5th October 2012, 01:54 AM   #3
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Location: Louisiana
If you don't find the fault, post a photo of the audio driver board.
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Old 5th October 2012, 05:59 AM   #4
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Quote:
Originally Posted by Perry Babin View Post
If you don't find the fault, post a photo of the audio driver board.
OK.Thanks! I will try to repair it later...
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Old 6th October 2012, 02:56 PM   #5
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The sawtooth on tl494 is "modulated". It changes its level.

I have changed tl494, but new one works same.

Last edited by zuarus; 6th October 2012 at 03:01 PM.
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Old 8th October 2012, 02:08 AM   #6
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How low is the DC voltage dropping on the following pins:

Pin 11
Pin 12
Pin 14

Place the black probe on pin 7 when measuring.
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