Roland 4x accordion
My 3 year old Roland 4X accordion has lost its marbles!  When turned on, lights come on but do not function.  No keyboard keys function.  When pressing any bass button, it hums continuously.  Also, It will not turn off until I pull the power cord.  What is going on?
Have you made backups of any custom registrations you may have made? If yes, you might want to do a factory reset. Also, what is the condition of your batteries? After 3 years, even after moderate use, it may be time to replace.

Also join the GROUPS.IO Roland groups, many more V-accordion users there than here.

My musical memoires blog/website:
You most likely need a power supply board replaced.
Owner & Operator "THE FISARMONICA SHOP" Chicopee, MA USA

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