Alle Fish

I tried with Montarbo and Warwick amps, hi and low gain with 3 different cables but results are the same: No sound with l/mono output , sound with headphones output

Hi everyone! I have some problem with mono output of XWP1. I never had trouble but one day suddenly stopped working, I checked jacks and other outputs like headphones and goes correctly. I turned up both keyboard and amp volumes but you can hear a very weak sound . What's going on?? Thanks all!