Spl dynamics EXT2000d

zuarus · 3rd October 2012, 08:32 PM

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!

zuarus · 4th October 2012, 08:38 PM

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.

Perry Babin · 5th October 2012, 01:54 AM

If you don't find the fault, post a photo of the audio driver board.

zuarus · 5th October 2012, 05:59 AM

Quote:

Originally Posted by Perry Babin

If you don't find the fault, post a photo of the audio driver board.

OK.Thanks! I will try to repair it later...

zuarus · 03:01 PM

The sawtooth on tl494 is "modulated". It changes its level.

I have changed tl494, but new one works same.

Perry Babin · 8th October 2012, 02:08 AM

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.

3rd October 2012, 08:32 PM	#1
zuarus diyAudio Member Join Date: Aug 2009	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!

5th October 2012, 01:54 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If you don't find the fault, post a photo of the audio driver board. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

6th October 2012, 02:56 PM	#5
zuarus diyAudio Member Join Date: Aug 2009	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.

8th October 2012, 02:08 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

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4th October 2012, 08:38 PM	#2
zuarus diyAudio Member Join Date: Aug 2009	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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