5.1 Troubleshooting
Installation Manual 237
• Network malfunction • 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.
Extensions (except IP-PT/SIP
Extension) do not operate.
• Extension card malfunction • Replace the corresponding card.
• Poor connection between
the PBX and the extension
• 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.
• A telephone with an A-A1
relay is connected.
• 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"
position.
• Extension malfunction • Take the extension and plug it into
another extension port that is working.
If the extension does not work, replace
the extension.
• Wrong type of PSU • Replace the PSU with the appropriate
type.
The PBX does not operate
properly.
• 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.
Noise on external paging. • Induced noise on the wire
between the PBX and the
amplifier.
• Use a shielded cable as the connection
wire between the PBX and amplifier. A
short shielded cable is recommended.
Distorted external music. • Excessive input level from
external music source.
• Decrease the output level of the
external music source by using the
volume control on the music source.
Alternate Calling—Ring/Voice
and Live Call Screening (LCS)
do not function as set when using
a Wireless Phone (KX-T7880/
KX-T7885/KX-TD7894/KX-
TD7895).
• Voice-calling mode and
Hands-free mode with LCS
are not available with
Wireless Phones.
• Switch the calling mode to ring-calling.
• Set the LCS mode to "Private".
The ALARM indicator on the
front of the shelf turns on red.
• A major system error
occurs in the PBX.
• See the error log using the KX-TDE
Maintenance Console (refer to "5.1.5
Troubleshooting by Error Log").
PROBLEM PROBABLE CAUSE SOLUTION
