I suspected your E480 voltage conversion was incorrect, can you provide images of the power board (front and back), maybe we can figure it out.
Accuphase E-480 meter flicking
My was running great about a year after voltage conversion, till this morning after I left it on overnight, the E480 meter start to flicking after playing music just for few mins, and does not make any more sound. I did turn it off, and on, change power cord, speaker cable it still does same thing it play for few mins, the meter start to flicking, and all sound disappear right after. any idea what may cause this issue?