Roland VersaCAMM VP-540 Service Notes page 121

Remove the battery on the Main Board by pushing it
2
down and tilting towards right.
Replace the battery with new one.
3
Be careful with the direction of the battery.
Turn on the main power, then turn on the sub power while
4
pressing the left, right and down keys to enter the
Service Mode.
Select [SUB MENU] > [CLOCK] > [TIME], and set the
5
time and press [ENTER] key.
The display of [B] which shows a battery
exhaustion disappears by this step.
SOCKET
SOCKET
MENU
SERVICE MENU
SERVICE MENU
SUB MENU
3-58
1
2
MAIN BOARD
BATTERY
MAIN BOARD
+
MENU
SUB MENU
CLOCK
[
CLOCK
TIME
[
TIME
00:00:59 B
[
TIME
13:01:59 B
[ ENTER ]
] [ ]
]
]