Sony Xperia Z4 Tablet User Manual Download

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For Assistance

Xperia™ Z4

Troubleshooting

Check Here First

Check the following Q & A. If problem persists, visit your
nearest a SoftBank Shop or contact

Customer Service

General

Information.

Hints

Handset freezes/operation is unstable

Power on handset again. If you are unable to power
off handset, Press & Hold

and Volume Up Key at

the same time for approximately three seconds, and
release your finger after it vibrates three times. Power
on handset again. Data that was being edited is erased
after handset is powered on again.

Operation is unstable after a new application was
installed

The newly installed application may be the cause.
Uninstall the application in Safe mode. See
"

Uninstalling Applications

." To power on handset in

Safe mode:

(Long Press)

Touch & Hold

Power off

Check Display,

・After powering on in Safe mode, "Safe Mode" appears

at lower left.

・After restarting in Safe mode, handset can be

powered on as usual.

・Before powering on handset in Safe mode, it is

recommended that you back up important data.

・By powering on handset in Safe mode, added widgets

may be deleted.

Cannot use phone, mail, or Internet

Check whether you are where signal is weak or out of
service area.

Power on handset again.

Is handset in Airplane mode? To check that Airplane
mode is canceled:

In Home Screen,

(Settings)

Airplane mode

(

)

Is data communication disabled? To check that data
communication is enabled:

In Home Screen,

(Settings)

Data

usage

Mobile data traffic

(

)

Is a disabled access point set? To reset to initial
settings:

In Home Screen,

(Settings)

Mobile networks

Access Point Names

Reset to default

Battery level goes down quickly

Are you where signal is weak or have been out of
service area for a long period? Calling where signal
is weak or being out of service area uses a lot of
Battery.

Cannot install applications

Applications cannot be installed with only a little free
space on handset or SD Card. To check free space,
see "

Storage

." Applications not supported by handset

cannot be installed.

Cannot unlock screen

Power on handset again. If you are unable to power
off handset, Press & Hold

and Volume Up Key at

the same time for approximately three seconds, and
release your finger after it vibrates three times. Power
on handset again. Data that was being edited is erased
after handset is powered on again.

Display is dark

If handset becomes high temperature, Display may
become dim. This is normal.

Cannot detect device connected via Micro USB Cable or
MHL Cable

Detach then reattach device, and then establish the
connection. Some devices may not be detected.

In Home Screen,

(Settings)

Xperia™

Connectivity

USB Connectivity

Detect USB

device

Charging stops while charging

If handset reaches a high temperature, charging may
stop temporarily. This is normal. When temperature
lowers, handset automatically restarts charging.

Handset becomes hot during use

Handset may become hot depending on usage, such as
calling, using browser, charging, etc. This is normal.
Direct contact or indirect contact (put in a pocket,
etc.) between handset and skin for a long time can
cause low-temperature burns.