TroubleshootingIf you are experiencing trouble, refer to the information in this section. Before troubleshooting, confirm allconnections (see "Connections (Page 158)") and confirm that the PoE (Power over Ethernet) device or poweroutlet to which the KX-NT400 is connected to is receiving power.Common Issues and SolutionsGeneral UseIssue Possible Cause & Solution ReferenceThe display is blank. • The KX-NT400 is not receiving power.→ The KX-NT400 is not designed to function when there isa power failure. Make sure that the device supplying PoEis receiving power and that the Ethernet cable is properlyconnected. If an AC adaptor is connected, confirm that theAC adaptor is connected and receiving power.Page 158The display is not shownwell.• The LCD’s brightness is too low.→ Adjust the LCD’s brightness. Page 121The KX-NT400 is notperforming properly.• Cables or cords are not connected properly.→ Check all connections. Page 158• Your connection settings are incorrect.→ Consult your administrator to confirm that your settings arecorrect.→ If the problem persists, consult your dealer.Page 165• An error has occurred.→ Reset the KX-NT400. When using PoE, disconnect theEthernet cable, wait 10 seconds, and then connect theEthernet cable again. If using an AC adaptor, disconnectthe AC adaptor from the power outlet, wait 10 seconds,and then connect the AC adaptor again.Page 176I cannot press the buttonson the screen.• The screen was not calibrated properly.→ Perform calibration again. You can perform the calibrationfrom the Display / Operation Settings screen.Page 121I cannot cancel theApplication lock evenwhen I enter the correctpassword.• Your extension has been locked by the PBX.→ To unlock your extension, the PIN and PIN lock for yourextension must be cleared. For details, consult yourmanager.—The KX-NT400 does notrespond when buttons arepressed.• The extension dial lock is set.→ Unlock the KX-NT400. Page 103• The KX-NT400 is connected to an eXtra Device Port.→ System programming is required. Consult your dealer. —192 Operating InstructionsAppendix
