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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
• Set Bluetooth to OFF when you are not using. →
Summary of Contents for Galaxy A21 SC-42A
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