TroubleshootingCommon Issues and SolutionsGeneral UseIssue Possible Cause & Solution ReferenceThe display is blank. • The unit is not receiving power.→ The unit is not designed to function when there is a powerfailure. Make sure that the device supplying PoE isreceiving power and that the Ethernet cable is properlyconnected. If an AC adaptor is connected, confirm that theAC adaptor is connected and receiving power.Page 59The display is not shownwell.• The display's contrast is too low.→ Adjust the display's contrast. Page 39The unit is not performingproperly.• Cables or cords are not connected properly.→ Check all connections. Page 59• Your connection settings are incorrect.→ Consult your administrator to confirm that your settings arecorrect.→ If the problem persists, consult your dealer.Page 37• An error has occurred.→ Restart the unit. Page 70is displayed on thescreen.• Registration to the SIP server has been lost.→ Consult your administrator or dealer. —I cannot hear a dial tone. • Confirm that the LAN cable is properly connected. Page 59I cannot cancel the displaylock.• The PIN number you entered was incorrect.→ Consult your administrator or dealer. —I forgot my PIN number. • Consult your administrator or dealer. —The date and time are notcorrect.• Adjust the date and time of the unit. Page 42The Message/Ringer lampis lit.• You received a voice message while you were on the phoneor away from your desk.→ Check the voice message.Page 32Document Version 2011-06 Operating Instructions 73Appendix