I know this is late, but... I ran into the same issue. Apparently on some models, there is round hole further to the left than the square on the diagram in the manual. You have to stick a paper clip or similar object in and depress it. It would be nice if they would tell you that in the manual. I had to call JBL.
The switch is a little square button above and between the 1 and the 5 of the 315 on the back panel. It is small and likely black and a bit hard to see, especially when it is pushed in. They are nearly flush with the surface of the back panel. Since you are not using a stereo mixer, you will have to use a mono cable (TS) rather than the TRS cablle. The TRS cablel would cause the signal to be nearly cancelled. The right way to do this is to run the L and R from the drum module into a mixer and then run a TRS cable from the mixer to the EON. As long as you keep the cable fairly short, the TS cable should work without too much hum pickup.
Thanks for your assistance. I've looked at the back of the unit several times now but there is no button. to the left of the red light there is a small circular indent indent, Inside this indent is a flat white surface. i wonder if this was the button and has been broken?
Simon
Oh, oh... yes, that could be where the button was. The buttons are around 3/16 inch square, and yes, if the button was sheared off, what you are seeing is probably where it was. Take a toothpick and press on the white flat surface... it wiil either go in or come out a bit if it is the button. This will be an alternate action button. It is between the two XLR connectors just to the left of the line/mic marking. This assumes you DO have a 315 model.
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