No such button. The best diagnostic tool would be to plug in a headset and make sure there is something coming out of the headphone jack. If it is, then check the RCA outs. If they work, then the problem is likely the leaf switch contacts within the headphone jack are not making contact.

Gary

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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)