Sony Xperia 1 IV SO-51C, Instruction Manual

Page: 249 / 282

247 Appendix
Operations are
not possible
when tapping
or pressing
keys
•
Check if the power is turned off.
→
P.47
•
Check if you activate the screen
lock.
→
P.213
The screen
reacts slowly
when you tap
or press the
keys When large amount of data is saved
to the terminal or transferring large-
size data between the terminal and
microSD card, the reactions on the
screen may be delayed.
The nano SIM
card is not
recognized Check if the nano SIM card is
attached in the right direction.
→
P.36
The clock is not
on time The clock time may become wrong
when the power is turned on for a
long time. Check that "Set time
automatically", "Set time zone
automatically", or "Use local default" is
ON and then turn on the power
again in a place with good signal
condition.
→
P.47, P.225
Phenomenon Cause and handling
The terminal
operation is
unstable Instability may be caused by
applications that you installed after
purchasing the terminal. If the
symptom is improved when you
boot the terminal in safe mode (near
default state), uninstalling the
installed application may improve
the symptom.
To boot the terminal in safe mode,
from the power OFF status, press and
hold the power key until the terminal
vibrates, wait until the docomo logo
appears, and press and hold the
volume down key long.
When the power is turned on, press
and hold the power key and the
volume up key at the same time
u
Touch and hold [Power off ] u Tap
[OK] to restart the terminal in Safe
mode.
When safe mode is booted, "Safe
mode" is displayed at the lower left of
the screen.
To exit the safe mode, turn power
OFF and then ON.
* Back up necessary data before
using safe mode.
* Some applications or widgets may
become hidden.
* Safe mode is not a normal active
state. To use ordinarily, exit from the
safe mode.
Phenomenon Cause and handling