Clears the contents of BOOKKEEPING.
When clearing, bring ">>" to "YES" and
when not clearing, to "NO", by using the SERVICE SW
or VR1 (red)/VR4 (green), and then push the TEST SW or START BUTTON.
When the data has been cleared, "COMPLETED" will be
displayed. Bring ">>" to "NO" and press
the TEST SW to cause the Menu mode to return on to the screen.
Also, note that the game setting contents are not affected by
BACKUP RAM CLEAR operation.