Denon AVR-X4200W Owner's Manual page 270

Contents Connections
Setup Lock
Protect settings from inadvertent changes.
o Lock
On:
Off
(Default):
0 When cancelling the setting, set "Lock" to "Off".
NOTE
0 When "Lock" is set to "On", no setting items are displayed except for "Setup
Lock".
Front panel Display
Playback
Turn protection on.
Turn protection off.
Rear panel
Settings
270
Remote
Tips Appendix
Index