Samsung Galaxy A21 SC-42A, Инструкция по эксплуатации, Страница: 138 / 159

136
Appendix
Appendix
Troubleshooting (FAQ)
Troubleshooting
• Troubleshooting ・If you suspect the terminal does not operate correctly,
you can check with diagnostics by yourself.
For details, see NTT DOCOMO website.
• First, check if software update is needed and if it is necessary, update
the software (Updating software) (P.140).
• When problems do not improve after checking the following items,
contact the phone number given in "Technical Inquiries & Repairs" on the
last page (in Japanese only) or DOCOMO-specified repair office.
‡
Power
Trouble Check and remedy
Cannot turn on the
terminal. • Is the battery exhausted? → P.29
Screen is frozen,
cannot turn off the
power. • Restart the terminal forcibly by pressing and
holding [Side key] and volume DOWN key for 7-8
seconds when the screen is frozen or you cannot
turn the power off.
* Note that data and the settings may be erased
since the operation restart forcibly.
‡
Charging
Trouble Check and remedy
Cannot charge the
terminal. • Is the power plug of adapter correctly inserted to
an outlet or accessory socket?
• Are the adapter and terminal inserted correctly?
• When using the AC adapter (sold separately), is
the Type-C plug of AC adapter firmly connected
to this terminal? → P.29
• When using a USB cable A to C 02 (sold
separately), is the power of the PC turned on?
• If you execute calls, communications or other operation
for a long time while charging, hot and cannot charge
the terminal. In this case, wait until the temperature of
the terminal drops down and retry charging.
‡
Operating terminal
Trouble Check and remedy
Become hot
while operating/
charging. • While operating or charging, or if you operate
apps for a long time while charging, the terminal
or adapter may become hot. There is no operation
problems and you can continue to use it.
The operation time
is short. • Is the terminal left for a long time out of service
area? Staying outside of the service area may
consume much power to search available radio
waves for communication.
• The operating time of the internal battery varies
depending on the operating environment and the
secular degradation of the internal battery.
• The internal battery is a consumable accessory. The
usage duration of the battery per 1 charge decreases
gradually each time the battery is recharged. When
the operation time is too short even if the terminal is
fully charged, contact "Technical Inquiries & Repairs"
(in Japanese only) on the back cover of this manual
or a repair counter specified by DOCOMO.
• Is the multiple apps booted? Close the apps you
are not using. → P.41
• Set Bluetooth to OFF when you are not using. →
P.125