Roland VersaCamm VS-640 Service Notes page 140

Replace the battery with new one.
3
Be careful with the direction of the battery.
Turn on the Main Power SW, then turn on the Sub Power
4
SW while pressing the left, right and down keys to enter the
Service Mode.
Select [SUB MENU]>[CLOCK]>[TIME], and set the time and
5
press [ENTER] key.
The display of [B] which shows a battery exhaus-
tion disappears by this step.
Select [SUB MENU]>[CLOCK]>[DATE], and set the date and
6
press [ENTER] key.
MENU
SERVICE MENU
SERVICE MENU
SUB MENU
SERVICE MENU
SUB MENU
3-67
Socket
Battery
Main Board
+
MENU
SUB MENU
CLOCK
[ ] [ ]
CLOCK
TIME
[ ]
TIME
00:00:59 B
[ ]
TIME
13:01:59 B
[
ENTER
SUB MENU
CLOCK
[ ] [ ]
CLOCK
DATE
[ ]
DATE
00/00/00
[ ]
DATE
09/01/13
[
ENTER
]
]