4.1.3 OperationPROBLEM PROBABLE CAUSE SOLUTION• When using the speaker-phone on an APT, nothingis audible.• The HANDSET/HEAD-SET selector is set to the"HEADSET" position.• When the headset is not used, set theHANDSET/HEADSET selector to the"HANDSET" position.• When using the speaker-phone/monitor mode witha DPT, nothing is audible.• The "HEADSET" mode isselected by Personal Pro-gramming, "Handset/Headset Selection".• When the headset is not used, select the"HANDSET" mode by Personal Program-ming.• The PT does not ring. • The ringer volume is off. • Turn on the ringer volume.• During a power failure,extensions connected toports 1 and 2 of Super Hy-brid Ports do not operate.• A DPT or APT is connec-ted to the extension port.• The dialling mode (tone orpulse) is incorrect.• Disconnect the DPT or APT and connectan SLT.• Set the Tone/Pulse switch to the other po-sition.• Originating an outsidecall, call transfer, or con-ference cannot be per-formed.• The corresponding CObutton does not exist onthe PT.• Programme the CO button. Referto "1.20.2 Flexible Buttons" in the FeatureGuide.• The LED of the CS doesnot change to Green ON.• CS is not connected prop-erly.• Make sure that the cable is connectedproperly with correct pin assignments. Al-so, make sure that the cable does notmake short circuits.• CS is not set for normaloperation.• Switch all DIP switches off.• The status of the port thatthe CS is connected to isOut of Service.• Change the port status from Out of Serv-ice to In Service using the MaintenanceConsole.• Both KX-TDA0158 andKX-TDA0155 CSs areconnected to the samecard, and theKX-TDA0158 CSs areconnected to higher-num-bered pins on the cardthan the KX-TDA0155CSs.• Connect the KX-TDA0158 CSs to low-er-numbered pins on the card than theKX-TDA0155 CSs.• Connect the KX-TDA0158 andKX-TDA0155 CSs to different cards.• The LED of the CS staysRed ON during normaloperation.• CS malfunction • Replace the CS.• "CLEAR SCAN DATA" isdisplayed on the PS’sscreen after turning on thePS.• The PS cannot be usedfor normal operationwhen scan data is storedon the PS.• Clear the scan data (refer to "2.7.5 SiteSurvey Using the KX-TCA255/KX-TCA256/KX-TCA355/KX-TD7590" or "2.9.5 Site Survey").Installation Manual 2434.1.3 Operation
