Extensions (except IP-PT/SIP
Extension) do not operate.
The PBX does not operate
Noise on external paging.
Distorted external music.
and Live Call Screening (LCS)
do not function as set when using
a Wireless Phone (KX-T7880/
The ALARM indicator on the
front of the shelf turns on red.
Extension card malfunction •
Poor connection between
the PBX and the extension
A telephone with an A-A1
relay is connected.
Wrong type of PSU
Induced noise on the wire
between the PBX and the
Excessive input level from
external music source.
Voice-calling mode and
Hands-free mode with LCS
are not available with
A major system error
occurs in the PBX.
Make sure that all network devices in
use are switched on.
Make sure that the IP-PT/SIP
Extension is not blocked by the firewall
or other network devices.
Replace the corresponding card.
Take the extension and plug it into the
same extension port using a short
telephone cord. If the extension works,
then the connection between the PBX
and the extension must be repaired.
Make sure that a 2-wire cord is used.
Make sure that the A-A1 relay switch of
the telephone is in "OUT" or "OFF"
Take the extension and plug it into
another extension port that is working.
If the extension does not work, replace
Replace the PSU with the appropriate
Press the Reset Button (refer to "5.1.4
Using the Reset Button").
Turn off the power switch, and then turn
it back on.
Turn off the power switch, and then
unplug the PBX. After 5 minutes, plug
the PBX back in, and turn the power
switch back on.
Use a shielded cable as the connection
wire between the PBX and amplifier. A
short shielded cable is recommended.
Decrease the output level of the
external music source by using the
volume control on the music source.
Switch the calling mode to ring-calling.
Set the LCS mode to "Private".
See the error log using the KX-TDE
Maintenance Console (refer to "5.1.5
Troubleshooting by Error Log").