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Appendix
Troubleshooting
Before you assume that the product is malfunctioning,
check the following:
Symptom
What you should check
Page
Cannot turn on
power.
Is the internal battery charged?
P. 15
Is
F
pressed and held?
P. 10
Is the charging lump blinking yellow?
P. 19
Cannot charge
the battery pack.
Is the charger connected
correctly?
P. 17
Is the temperature of the product
or battery pack high or low?
Charging may stop due to the
temperature of the product or
battery pack.
P. 15
Are the specified accessories
(adapter, etc.) used to charge?
P. 17
Cannot operate/
The screen
freezes/Cannot
turn off power.
Press and hold
F
for 11
seconds or longer to force
shutdown and restart.
P. 19
The power goes
off.
Is the internal battery fully
charged?
P. 15
The power is
going off while the
activation logo is
displaying.
Is the internal battery fully
charged?
P. 15
Cannot make
calls.
Is the power turned on?
P. 18
Is your au Nano IC Card (LTE)
inserted?
P. 12
Symptom
What you should check
Page
Cannot receive
calls.
Is signal strong enough?
P. 23
Is the product out of the service
area?
P. 23
Is the power turned on?
P. 18
Is your au Nano IC Card (LTE)
inserted?
P. 12
" " (out of service
area) appears.
Is the product out of the service
area or in an area where the signal
is weak?
P. 23
Is the built-in antenna covered
with finger etc.?
P. 10
Cannot operate
key/touch panel.
Is the power turned on?
P. 18
Turn off the power and then turn it
on again.
P. 18
" " appears.
Is your au Nano IC Card (LTE)
inserted?
P. 12
A message such
as charge the
battery appears.
The battery is almost dead.
P. 15
Battery usage
time is short.
Is the product fully charged?
• Charge the product until the red
charging light goes off.
P. 15
Is the internal battery end-of-life?
P. 21
Is the product left in the place for
a long period where " " (out of
service area) appears?
P. 22
End/Stop the apps or functions
which are not used.
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