Method 1. Use the remote control from the menu menu "Settings" - "Operation Lock" - select "Off". Select "Off" from the menu.
Method 2. Press and hold the Enter button on the control panel for about 7 seconds and the lock will be released.
Numerical control generally refers to computer numerical control. Computer numerical control is an NC system that utilizes a dedicated program-storable computer to perform some or all of the basic digital control functions.