Restricting Use of the Operation Panel

If your machine is of the black and white LCD model, you can protect the machine settings from inadvertent changes by restricting use of the keys on the operation panel.
For more information about the basic operations to be performed when setting the machine from the Remote UI, see Setting Up Menu Options from Remote UI.
Start the Remote UI and log in to System Manager Mode. Starting Remote UI
Click [Settings/Registration] on the Portal page. Remote UI Screen
Select [Device Management]  [Key Lock Settings].
Click [Edit].
Select the [Enable Key Lock] check box  [OK].
Even when the keylock function is activated, the following keys can be used.
Home key
Back key
Energy Saver key
Stop key