Casio WK-240 Service Manual & Parts Catalogue page 26

A-3. Check that the following screen appears.
A-4. Press the [0] button to return to the main screen.
B. AC Adaptor Check
[NOTE] If you use the batteries, do not perform this check.
B-1. Press the "3" button to select the "AC Adaptor Check".
B-2. Press the "3" button again.
B-3. Check that "AD3xxx" is displayed.
[NOTE] "xxx" is in the range of "000" to "1FF".
B-4. Press the [0] button to return to the main screen.
C. ROM Check
C-1. Press the [5] button to select the "ROM Check".
C-2. Press the [1] button to start the check.
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WK-240