Samsung SyncMaster 2253BW, 2253LW User Manual page 27

Adjusting the Monitor
When pressing the MENU button after locking the OSD
This is the function that locks the OSD in order to keep the current states of settings or prevent others
from adjusting the current settings.
Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment
lock function.
Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment
lock function.
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