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Appendix/Index
Troubleshooting (FAQ)
Troubleshooting
You can diagnose the handset if there are problems with the
performance. For details, refer to the DOCOMO website.
h
(
ttps://www.nttdocomo.co.jp/english/support/trouble/repair/)
Check whether the software update is required. If it is required,
update the software (>P. 89 "Software update").
If there is no improvement on the problems even after checking
the following items, feel free to contact the number listed in
"Repairs" (in Japanese only) on the last page or a repair counter
that DOCOMO specifies.
■
Power
The handset is not turned on
･ Make sure the battery has not run out. >P. 16 "Charging"
The screen does not respond or the handset cannot be turned off
･ You can turn the power off forcibly by pressing 0 for at least
8 seconds.
･ Release your finger after the vibrator is activated to turn the
power off.
･ Note that data, contents you have set, etc. may be deleted
since the power is turned off forcibly.
Charging
■
Cannot charge the battery
The charging lamp does not illuminate or it flashes
･ Is the power plug of the adapter inserted into the outlet or
accessory socket properly? >P. 17 "Charging with AC
adapter/DC adapter"
･ Are the adapter and the handset set properly?
>P. 17 "Charging with AC adapter/DC adapter"
･ When using an AC adapter (sold separately), are the
microUSB plug of the AC adapter and the handset securely
connected? >P. 17 "Charging with AC adapter/DC adapter"
･ If a call, communication or another function is performed for a
long time while charging, the handset may become warm and
charging may stop. Charge again after the handset
temperature lowers. >P. 16 "Cautions while charging"
･ Is an adapter specified by NTT DOCOMO being used for
charging? Contact the number listed in "Repairs" (in Japanese
only) on the last page or a repair counter that DOCOMO
specifies if you cannot charge the battery even when using a
specified one.
･ Is light intensity set to change by definite pattern while
charging? >P. 64 "Illumination"
Handset operation
■
Becomes hot while operating/charging
･ The handset, internal battery or adapter may become warm
while you are operating or charging the handset, when you
use video call, watch videos, etc. for a long time while
charging, etc. There is no operational problem.
>P. 16 "Cautions while charging"
Battery life is short
･ Make sure the handset is not left for a long time outside the
service area.
Outside the service area, since radio waves are searched to
make communication available, more electric power than
usual is used.
･ The battery life depends on the usage environment and
deterioration level. >P. 90 "Main specifications"
･ Internal battery is a consumable product. Battery life per
charge is gradually reduced every time the battery is charged.
Contact the number listed in "Repairs" (in Japanese only) on
the last page or a repair counter that DOCOMO specifies if the
battery life becomes extremely shorter than at the time of
purchase even after fully charged. >P. 17 "Internal battery
usable life"
Not activated by touching or pressing keys
･ Make sure the handset is not turned off. >P. 18 "Turning
power on"
Screen response is slow when touching or pressing keys
･ This may happen when a great deal of data is saved on the
handset, when a large amount of data is being transferred
between the handset and the microSD Card, etc.
>P. 67 "Storage & USB"
docomo nano UIM card is not recognized
･ Is the docomo nano UIM card inserted facing right direction?
>P. 15 "docomo nano UIM card"
Clock is incorrect
･ Clock may become incorrect if the power is left turned on for a
long time. Make sure [Automatic date & time] is enabled and
turn the power on again in a location with good signal
conditions. >P. 74 "Date & time"
Handset operation is unstable
･ The apps installed on the handset after purchase may become
a cause. If you can improve the symptoms by activating the
handset with the safe mode set, you may be able to improve
the symptoms by uninstalling the installed apps.
※ The safe mode is a function to activate the handset
nearly in the state of default.
･ For activating the safe mode
Turn the power on again when the power is turned off, then
keep pressing 2 on the screen during activation until the
lock screen of the touch panel is displayed.
※ Alternatively, 0 while the power is turned on (for at
least 1 second)/touch and hold [Power off]/[OK] to
activate the safe mode.
Also, activate the safe mode from Self check.
>P. 66 "Self check"
※ When the safe mode is activated, [Safe mode] is
displayed at the bottom left of the screen.
※ To deactivate the safe mode, turn the power on again.
･ Back up the necessary data in advance before using the
safe mode.
･ Widgets may disappear.
･ The safe mode is not an ordinary activating state and thus
deactivate the safe mode if you want to use in an ordinary
way.
Apps do not work properly (e.g. inability to activate them,
frequent errors)
･ Make sure there is no disabled app. Try again after enabling a
disabled app, if any. >P. 67 "Enabling an app"
･ Is the use of requiring function for operating the app allowed?
>P. 30 "First things first"
･ Make sure Battery optimization is not carried out.
>P. 30 "Battery optimization"
85
Appendix/Index
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