When Enhanced Security Mode is set to ON, the administrator can restrict the use of the service mode by the customer engineer.
Press Utility/Counter on the control panel to display [UTILITY], then press [Administrator Setting] to display the [Administrator Setting Menu] screen.
On the [Administrator Setting Menu] screen, press [Security Setting], and then press [Service Login Allow Setting].
The [Service Login Allow Setting] screen is displayed.
Press [Allow], then press [OK].