Sennheiser Rr840 "choice centeral" Questions

RR840WHERE DO I MAIL MY RR840 HEADPHONES FOR REPAIR? Hi Paul, Here is a complete search at WOW . Just follow this link to find a service repair center for your asking. Many choices. sennheiser repair ...

ITRR-501 NO SOUND DIAGNOSE HEAR THE SPEAKER SOUND WHEN UNIT IS TURNED ON BUT NO MUSIC OUT OF ANY SOURCE. I was asked to further clarify problem, but not much to add when there is absolutly no sound it