Revisa con multimetro ese "adaptador nuevo" no vaya ser que no este enviando la energia adecuada y pueda estropear tu multiefecto.
Hola Aldelamor, te adjunto un problema similar al tuyo que he encontrado en la Web (respuesta del servicio tecnico de Roland)
"The display flashed up with a 'b' ALL the time. I sent an email to roland support and they advised me there was a fault with the unit so I put batteries in the unit - It worked fine - The problem was the power supply, so just out of interest I tried one of my old universal adaptors - worked fine - BOSS/ROLAND you are full of ****. Other than the power supply - had no problems whatsoever in over a years heavy use."
El tema es la fuente de alimentacion, prueba a ponerle pilas o bien otro adaptador o el original de Boss.
Ya nos cuentas como ha ido.
