Installation Manual - Panasonic

4.1 Troubleshooting4.1.3 OperationPROBLEM PROBABLE CAUSE SOLUTION• When using thespeakerphone on aproprietary telephone(PT), no sound is heard.• The HANDSET/HEADSET selector is setto the "HEADSET"position.• The PT does not ring. • The ringer volume is set tooff.• During a power failure,PTs connected to jacknumber 01 does notoperate.• Outside (CO) line callscannot be made with a PT.• An SLT set to "tone"dialling mode cannotmake calls.• A flexible button on the PThas not been programmedto select an outside (CO)line.• There may be somethingwrong with the DTMF(Dual Tone Multi-Frequency) receiver.• When the headset is not used, set theHANDSET/HEADSET selector to the"HANDSET" position.• Set to "HIGH" or "LOW".• Only single line telephones (SLTs) can beused during a power failure. Disconnectthe PT and connect an SLT.• Programme the CO buttons. Refer to"1.18.2 Flexible Buttons" in the FeatureGuide.1. Select "Enable" for DTMF receiver 1 and"Disable" for DTMF receiver 2 throughsystem programming, "DTMF ReceiverCheck [107]".2. Try to make a call using a tone-type SLTconnected to one of extension jacks 01–08.3. If you cannot make the call, the problemmay have been caused by DTMF receiver1. If the call can be made, go to step 4.4. Try DTMF receiver 2. Select "Disable" forDTMF receiver 1 and "Enable" for DTMFreceiver 2 through system programming,"DTMF Receiver Check [107]", and makeanother call. If you cannot make the call,the problem may have been caused byDTMF receiver 2.78 Installation Manual