Appendix 2: Troubleshooting - Panasonic KX-TU400 EX Operating Instructions Manual

Appendix 2: Troubleshooting

If you find exceptions when operating the mobile phone, restore the factory settings and
then refer to the following table to solve the problem. If the problem persists, contact the
distributor or service provider.
Fault
SIM card error
Poor received
signal quality
The mobile phone
cannot be powered
on
Calls cannot be
dialed
The mobile phone
cannot connect
the network
The battery cannot
be charged
Cause
The SIM card is damaged.
The SIM card is not in position.
The metal face of the SIM card
is polluted.
Signals are obstructed. For instance,
radio waves cannot be effectively
transmitted nearby a high building
or in a basement.
Line congestions occur when
you use the mobile phone
in high-traffic hours
The battery energy is exhausted.
Call barring is activated
The SIM card is invalid
The mobile phone is not in a service
area of the GSM network
The signal is weak
The charging voltage does not match
the voltage range indicated
on the charger
An improper charger is used
Poor contact
Contact your network service provider
Move to a place where signals
can be effectively transmitted
Avoid using the mobile phone
Contact your network service provider
Move to the network operator's
Ensure the charging voltage matches
the voltage range indicated
Use the charger specially designed
Ensure the charger plug is in good
contact with the mobile phone
27
Solution
Check the SIM card
Clean the SIM card
with a clean cloth
in hightraffic hours
Charge the battery
Cancel call barring
service area
Move to a place where
the signal quality is high
on the charger
for the mobile phone