ZTE Corporation X990 Manuale Utente
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Failure Analysis
Symptoms
Possible Causes
Solutions
Unable to turn on the
phone
phone
Inadequate battery capacity
Charge the battery
Poor contact
Reinstall the battery
Autom atic
power-off
power-off
Seriously poor battery capacity
Recharge the battery
Inadequate standby
time
time
Deceasing of battery
performance
performance
Replace the battery
Poor network signal
Turn off the phone as the signal is poor.
Unable to connect the
network
network
Poor network signal
Move to other places
Out of the service area
Make sure your phone is in network service
area
area
Call drop
Poor network signal
Move to other places
Do not ring upon
incoming c alls
incoming c alls
Set “Silent” or minimum
volume
volume
Enter “User Profiles” to set Non-silent or
check the ringing volume.
check the ringing volume.
Prompt to input PUK
SIM c ard loc ked due to the
continuous entering of wrong
PIN code for three times.
continuous entering of wrong
PIN code for three times.
Contact your operator.