Roland SJ-645EX - Manual (Page 113)

111 Chapter 8: Specifications
8-4 Locations of the Power Rating and Serial Number Labels
Serial Number
This is require when you seek maintenance,
servicing, or support. Never peel off the la-
bel or let it get dirty.
Power Rating
Use an electrical outlet that meets the re-
quirements for voltage, frequency, and am-
perage given here.