Re: Mackie CR4 amplifier no sound

Thank you.

Yes, I completely removed C39 before testing. This image was taken before that task.

I find it interesting that the headphone output, on the front of the speaker, still works. Even without C39. It's like nothing changed with the removal of that cap.

But I'm not really in the mood to work on it at the moment. However, I have bookmarked this thread and will work on it more when I have more time. I think I do need to use my multimeter and check voltages next. That will be more learning/practice. ...

Re: Mackie CR4 amplifier no sound

Hello. Today I got all the parts I needed to work on this. And I managed to unsolder C39. However, there is still no audio from the speakers. Yet the headphone output on the front of the speaker still functions. The input does too for that matter.

So there is no gain, yet there is no loss either.

When I first opened them up, I noticed a half dollar sized darkened blotch above C39 ( where some rather large caps are located -- you can kind of see it at the top of the image attached) on the back of the board. I suspect this...

Re: Mackie CR4 amplifier no sound

Thank you, UserXP, for the detailed information.

I just ordered some items to help in my task (canonical tip for my Weller iron, Solder Wick, etc) that won't come for another week. I'm excited to give this a try and will keep your posted on either success or failure.

Re: Mackie CR4 amplifier no sound

Hello. I came across this thread when trying to diagnose a pair of CR3's that exhibit the same behavior of no sound through the speaker but still has sound through the headphone jack.

I didn't want to cut PIN 5 because that seems like a crude workaround, but I must say I have no practical experience with electronics. I do the necessary tool though and consider this a first project -- the speakers already don't work and have a replacement, so if they are damaged in the process (though I'd like to avoid it) it is no big loss to me....