KR-575: Panel Lock
The KR-575 has a feature called Panel Lock which disables all front panel buttons. When panel lock is engaged, Grand Piano 1 is automatically selected as the instrument sound. Use the following procedure to engage panel lock:
1) Turn the unit off.
2) While holding down FUNCTION, turn the unit back on.
NOTE: Switching the power off and back on again cancels the panel lock function and returns the keyboard to its normal operating condition.