protection mode won't go off

Darkcrusher · 30th January 2006, 02:43 PM

I think the speaker terminals got short cutted cause when I noticed there wasn't any sound , they were lose and protection led switched on, I disconnected speakers and checked fuses, and when i turn my amp on, it goes again in protection. I fear that I blowed it up. What can I check for to fix it ? Could it be a power transistor I need to replace ? Any help is welcome......

clem_o · 31st January 2006, 01:10 AM

Open up the amplifier and look for additional fuses, on the amplifier board. If one of these opened, it would cause a huge DC offset on the amplifier output and force the protection circuit on all the time.

If there aren't any other fuses inside, then yes, suspect shorted output (and driver?!) transistors...

Cheers!

anatech · 1st February 2006, 12:22 AM

Hi Darkcrusher,
What is the make and model?

-Chris

Darkcrusher · 2nd February 2006, 10:11 AM

Well, its a TOXIX amp model TX-1600N . its a 4 x 400W amp and sin bridges are possible to have 2x400W @ 1x 800W . I demounted it and desolderd 2 power mosfets, all 4 driving trans, 2 of the 8 power trans (1 looked suspecious) and compared with my ohm meter, but they have same resistance in all maners of measerement. I solderd everything back in place now, and will test if the protection might go off if i shortcut and open wires of the temperature sensor, since that one could cause the prob too. If thats not the prob then I think its for trashcan , unless you or someone else comes up with something....

Stocker · 2nd February 2006, 11:54 AM

There is usually some help to be had for fixing amplifiers here. If you want to do some hard work on your own, that is.

anatech · 2nd February 2006, 02:10 PM

Hi Darkcrusher,
Ahhhh, we are talking about a car power amplifier!

Check your connections to B+ and Ground. They have to be excellent, so don't just look at them, reconnect them and use star washers to ground to ensure a good connection.

Also check the small wire from the battery negative to the car body. I've seen people smoke those off.

-Chris

30th January 2006, 02:43 PM	#1
Darkcrusher diyAudio Member Join Date: Jan 2006 Location: Belgium	protection mode won't go off I think the speaker terminals got short cutted cause when I noticed there wasn't any sound , they were lose and protection led switched on, I disconnected speakers and checked fuses, and when i turn my amp on, it goes again in protection. I fear that I blowed it up. What can I check for to fix it ? Could it be a power transistor I need to replace ? Any help is welcome......

2nd February 2006, 10:11 AM	#4
Darkcrusher diyAudio Member Join Date: Jan 2006 Location: Belgium	model and status Well, its a TOXIX amp model TX-1600N . its a 4 x 400W amp and sin bridges are possible to have 2x400W @ 1x 800W . I demounted it and desolderd 2 power mosfets, all 4 driving trans, 2 of the 8 power trans (1 looked suspecious) and compared with my ohm meter, but they have same resistance in all maners of measerement. I solderd everything back in place now, and will test if the protection might go off if i shortcut and open wires of the temperature sensor, since that one could cause the prob too. If thats not the prob then I think its for trashcan , unless you or someone else comes up with something....

2nd February 2006, 11:54 AM	#5
Stocker diyAudio Member Join Date: Dec 2003 Location: Austin	There is usually some help to be had for fixing amplifiers here. If you want to do some hard work on your own, that is. __________________ Jesus loves you.

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31st January 2006, 01:10 AM	#2
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Open up the amplifier and look for additional fuses, on the amplifier board. If one of these opened, it would cause a huge DC offset on the amplifier output and force the protection circuit on all the time. If there aren't any other fuses inside, then yes, suspect shorted output (and driver?!) transistors... Cheers!

1st February 2006, 12:22 AM	#3
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Darkcrusher, What is the make and model? -Chris

2nd February 2006, 02:10 PM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Darkcrusher, Ahhhh, we are talking about a car power amplifier! Check your connections to B+ and Ground. They have to be excellent, so don't just look at them, reconnect them and use star washers to ground to ensure a good connection. Also check the small wire from the battery negative to the car body. I've seen people smoke those off. -Chris

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