This might be too late answer for a 5 year-old post.
But i think it might be useful for other who own 303/300 and need to converse its voltage, because I've tried to find the solution too and can't get it for a long time. Finally I've to pay $30 to an electrician for just moving 2fuses from their original sockets to the others sockets.
it is very simple. You could see "L" & "H" printed on a circuit board nearby fuse sockets. To change this CD power consumption voltage from 110V to 220V, just move both 2 fuses from "L" socket to "H" sockets.
THAT ALL!!!
But i think it might be useful for other who own 303/300 and need to converse its voltage, because I've tried to find the solution too and can't get it for a long time. Finally I've to pay $30 to an electrician for just moving 2fuses from their original sockets to the others sockets.
it is very simple. You could see "L" & "H" printed on a circuit board nearby fuse sockets. To change this CD power consumption voltage from 110V to 220V, just move both 2 fuses from "L" socket to "H" sockets.
THAT ALL!!!