ConnectivityThe SD card or other external device does not work.The unit cannot connect to a network.• The corresponding hardware feature may be disabled by the [DeviceManagement] app (see“Enabling and disabling certain hardware features” (page 28)).The unit is not recognized as a mass storage device when connected to a computer (certain modelsonly).• Make sure that USB tethering is turned off.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [Network & Internet] ®[Hotspot & tethering].2. Tap the [USB tethering] switch to turn it off.I want to confirm the unit’s MAC address.• Follow the procedure below.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [System] ® [Abouttablet] ® [Status].2. Confirm the address.SoundNo sound is heard.• Using the [Dashboard] app, adjust the speaker volume and make sure that the [Silent] checkboxis turned off.• Do not disturb mode is set to [Total silence]. Open the notifications panel, and then turn off Do notdisturb mode or change the mode type.Sound stops or is distorted.• It is normal for the sound to stop or be distorted in the following situations.– When connecting or disconnecting a headset or headphones– When rotating the screenSounds are heard from the speaker even when a headset or headphones are connected.• Notification sounds and alarms are played using the speaker even when a headset or headphonesare connected to the unit. This is normal.OtherThe date and time are incorrect.• Confirm the date and time settings. Swipe up the home screen, and then in the app list, tap[Settings] ® [System] ® [Date & time].• Set the date and time automatically.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [System] ® [Date &time].2. Tap the [Automatic date & time] and [Automatic time zone] (certain models only) switchesto turn them on.3. Make sure the unit is in an area with good wireless reception, turn the unit off, and then turn iton again.• The unit will not recognize dates after December 30, 2037.The unit’s operation is slow.• Ambient temperature may be too low or too high. Leave the unit in an environment of 10 °C to35 °C (50 °F to 95 °F) for about an hour and then try again.Operating Instructions - Reference Manual 47Troubleshooting