XPA-1L Gen 1 - 12V trigger in failed... Any suggestions?

[budesonide]

Hi guys, I've had a pair of XPA-1L Gen1  amps since 2013. They sound great still but unfortunately one of them developed a problem lately. One of them stopped responding to the 12V trigger input to turn on. If I turn it on, it's still able to trigger the output to the second amp so at least I don't have to press the on button separately for both.

They're connected to the XSP-1 preamp. I've confirmed that the problem is confined to that one amp. One interesting "symptom" I've noticed is that the front status blue LED of the affected amp is dimmer than the other amp without a problem. Can't be sure that this is directly related.

Anyhow, I'm waiting for the Emotiva service department to get back to me. In the meantime, has this happened to anyone else? Anyone know if that front daughter board with the LED indicator is in charge of detecting the 12V trigger and turning on the amp? Is a dim status LED a known indicator of something wrong?

Thanks!

[macromicroman]

Did you try reversing the order of the 2 amps? Connect the 12V trigger to the good amp 1st and then that amp to the one that doesn't work. Probably a long short but worth a try.

[budesonide]

May 31, 2019 6:27:48 GMT -5 macromicroman said:

Did you try reversing the order of the 2 amps? Connect the 12V trigger to the good amp 1st and then that amp to the one that doesn't work. Probably a long short but worth a try.

Yes I did MMM. What happens then is that the good amp is triggered to turn on by the XSP-1, but cannot in turn trigger the other one. :-(

I'm curious also about the dim status LED. Have not heard anyone mention this elsewhere. Does this correlate to anything? Like maybe if a transistor went bad or anything like that?

[AudioHTIT]

May 31, 2019 8:49:37 GMT -5 budesonide said:

...
I'm curious also about the dim status LED. Have not heard anyone mention this elsewhere. Does this correlate to anything? Like maybe if a transistor went bad or anything like that?

You’d have to have pretty intimate knowledge of the circuitry to answer that, best give them a call and see if it’s something you can fix.

[AudioHTIT]

If you run into a dead end and the cost of repair, shipping, etc. becomes too high; here’s an alternative trigger mechanism that I’ve used and find pretty cool.

Enclosed High-Power Power Relay (Amazon)

[budesonide]

May 31, 2019 10:28:22 GMT -5 AudioHTIT said:

If you run into a dead end and the cost of repair, shipping, etc. becomes too high; here’s an alternative trigger mechanism that I’ve used and find pretty cool.

Enclosed High-Power Power Relay (Amazon)

Thanks for the tip. Not too expensive if it comes to that :-|.

Got confirmation from Emotiva that indeed the trigger does go forward to the front microcontroller (which also controls the LED). Hmmm...