Help with headphone jack problem

[diagonalizer]

On my piano 2 HP there seems to be an unusual problem with my headphone jack that hopefully someone can help me with. I can hear acoustic pianos fine but when selecting an electric piano I can only hear what sounds like the reverb tail through the headphones. If I switch the reverb off I hear nothing. Thanks in advance!

[diagonalizer]

Are you perhaps using 1/8" headphone jack with adapter? Your headphone connection is shorting L and R channels together, resulting in phase cancellation. What you are (not) hearing is physics in action -- parallel mono feeds which are 180 degrees out of phase and therefore canceling. Turning reverb on salvages some portion of signal, allowing you to hear something.

[diagonalizer]

Thanks, good point. My adapter has a tip ring sleeve arrangement designed for unbalanced stereo but I will test to see whether the tip and ring are shorted.

[diagonalizer]

Unfortunately it is not my adaptor. I agree that the problem is most likely due to the left and right channel from the headphone amplifier being shorted but this must be happening inside the keyboard.

[pablomastodon]

Sustain pedal jacks are notorious for being damaged as a result of someone having stepped on the cable. Perhaps there is something amiss inside your headphone jack. This will probably not be determined without visual confirmation. If I were you, I'd test this with a "standard" 1/4" headphone before paying someone to open up your instrument...

Please let us know how this works out in the end.

Bless,

Pablo