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Tom7227 19th January 2013 03:55 PM

Eclipse XA1200
 
Guys,

Looking for some help troubleshooting this amp. Came in with blown power supply fets (Irf1010's) and shorted Output FET IRF3710. The amp comes on and has a nice square wave in the output section , but no audio.

I troubleshot this down to no audio coming into the class D driver module. I determined that the muting section of this amp is causing the issue. Does anybody have info on this amp? The muting circuit looks quite complex, and help would be appreciated.

:)

Tom7227 20th January 2013 04:59 PM

Bueller .... Bueller.. anybody? :)

Tom7227 23rd January 2013 01:24 AM

Well, Persistence pays off, figured it out.

This amp came in with 6 burned IRF1010E's (SMPS ) , and a shorted Output FET irf3710 , that probably caused the whole thing to happen.

I replaced all the said components and I was able to regain the power supply and output section to oscillate. The last issue was I had no modulated audio. Luckily, the class D driver module had all the pins marked with there functions, +15 -15 audio in..ect.

I didnt have audio in, so I traced it back to the muting circuit. I found audio on a transistor, but no audio ouput on its emitter. I was able to trace it back thru a few semiconductors and switching diodes, to a shorted 47uf cap. Replaced the cap... and I have audio.

For those who read this post, it's C921, it part of the mute/protection circuit, not sure because I have no schematic.


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