Roland XV-2020 Owner's Manual page 107

Check to make sure the board
has been installed properly
1.
Press the POWER switch on the XV-2020 to switch on the
power.
2.
Press [VALUE] to make the PATCH indicator lights up.
fig.1-04
* When you have a Wave Expansion Board installed, "roland XV-
2020" is displayed when you turn on the power, and then the letter for
the connector to which the board is attached (EXP A or B), and the
last two digits of the Wave Expansion Board's model name flash twice
in the display.
For example, If you have an SRX-01 "Dynamic Drum Kits"
connected to the EXP A connector, "A01" will flash twice.
3.
Turn [CATEGORY/BANK] to choose EXP-A (B).
fig.1-05
If 001 appears in the display, the Wave Expansion Board has
been installed correctly.
* If the display shows "- - -," it's likely that the Wave Expansion Board
is not being recognized correctly. Follow the steps in "Turning the
Power On/Off (p. 12)" to switch off the power, then reinstall the
Wave Expansion Board, making sure you do it correctly.
Installing a Wave Expansion Board
107