1. Swipe up the home screen, and then in the app list, tap [Settings] (® [System])*1 ® [Abouttablet] (® [Status])*1.*1 Android 8.1 only2. Confirm the address.SoundNo sound is heard.• Using the [Dashboard] app, adjust the speaker volume and make sure that the [Silent] checkboxis turned off.• Customized silent mode was turned on. Turn customized silent mode off (see“Turning customized silent mode on and off” (page 42)) or configure customized silent mode to notmute the unit’s sounds (see “Configuring customized silent mode” (page 41)).• Android 8.1: Do not disturb mode is set to [Total silence]. Open the notifications panel, and thenturn off Do not disturb mode or change the mode type.Android 9: Do not disturb was turned on. Open the notifications panel, and then turn off Do not disturbmode or configure Do not disturb settings to not mute the unit’s sounds. To configure Do not disturbsettings, swipe up the home screen, and then in the app list, tap [Settings] ® [Sound] ® [Do notdisturb].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.• Swipe up the home screen, and then in the app list, tap [Settings] ® [Sound] ® [Advanced], andthen tap the [Speaker off during earphone use] switch to turn it on.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] (models supporting cellulartransmission only) switches to 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.The unit does not respond.• Turn the unit off and then on again.• If an app does not work normally, follow the instructions below to force quit or uninstall theproblematic app or process.1. Swipe up the home screen, and then in the app list, tap [Settings] ® [Apps & notifications].2. Select the desired app or process and then tap [UNINSTALL] or [FORCE STOP].62 Operating Instructions - Reference ManualTroubleshooting