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4.1 Troubleshooting
90 Installation Manual
4.1.3 Operation
PROBLEM PROBABLE CAUSE SOLUTION
• When using the
speakerphone on a
proprietary telephone
(PT), no sound is heard.
• The HANDSET/
HEADSET selector is set
to the "HEADSET"
position.
• When the headset is not used, set the
HANDSET/HEADSET selector to the
"HANDSET" position.
• The PT does not ring. • The ringer volume is set to
off.
• Set to "HIGH" or "LOW".
• During a power failure,
PTs connected to jack
numbers 01, 09, or 17 do
not operate.
• Only single line telephones (SLTs) can be
used during a power failure. Disconnect
the PT and connect an SLT.
• Outside (CO) line calls
cannot be made with a PT.
• A flexible button on the PT
has not been programmed
to select an outside (CO)
line.
• Programme the CO buttons. Refer to
"1.18.2 Flexible Buttons" in the Feature
Guide.
• An SLT set to "tone"
dialling mode cannot
make calls.
• There may be something
wrong with the DTMF
(Dual Tone Multi-
Frequency) receiver.
1. Select "Enable" for DTMF receiver 1 and
"Disable" for DTMF receiver 2 through
system programming, "DTMF Receiver
Check [107]".
2. Try to make a call using a tone-type SLT
connected to one of extension jacks 01–
08.
3. If you cannot make the call, the problem
may have been caused by DTMF receiver
1. If the call can be made, go to step 4.
4. Try DTMF receiver 2. Select "Disable" for
DTMF receiver 1 and "Enable" for DTMF
receiver 2 through system programming,
"DTMF Receiver Check [107]", and make
another call. If you cannot make the call,
the problem may have been caused by
DTMF receiver 2. If the call can be made,
go to step 5.
5. Check the other 4 DTMF receivers the
same way through "DTMF Receiver Check
[107]" in system programming.