Troubleshooting, Resetting the unit, Checklist – Sony NV-U84 User Manual
Resetting the unit
When you encounter any malfunction with
software or hardware, try resetting the unit first.
Press the RESET button, then turn on the unit.
After you reset the unit, it may take some time to
receive GPS signals when turning on the unit.
The following checklist will help you remedy
problems you may encounter with your unit.
Before going through the checklist below, check
the connection and operating procedures.
The unit does not turn on.
t Charge the built-in battery.
t Check that the car battery adapter is securely
inserted into the cigarette lighter socket.
The unit turns on automatically (display
remains off), even while not in use.
If the unit’s internal temperature becomes excessive, it
enters battery discharge mode and turns on
automatically to reduce the charge capacity to protect
The CHG indicator is off even while the adapter
is connected. (NV-U94T/U84 only)
The CHG indicator turns off during the battery
The built-in battery cannot be charged.
t Turn on the unit, then turn off the unit.
t If the car battery adapter is being used, disconnect
it from the cigarette lighter socket, then reconnect.
t Turn on the computer during USB charge.
Note that the CHG indicator may light up in green
in the computer standby mode, even though the
built-in battery is not fully charged.
• The built-in lithium-ion battery can be charged at
temperatures between 5 – 45 ºC (41 – 113 ºF). The
battery may not be charged if the temperature inside
the unit increases because of direct sunlight exposure,
etc. This is not a malfunction.
• If the usage time of the built-in battery becomes
excessively short after charging, the battery may have
deteriorated. (NV-U94T/U84 only)
t Contact the Customer Support Center:
The LCD is not displayed normally.
In high temperatures, the LCD may darken and not
display clearly. In low temperatures, afterimage may
occur on the LCD. These are not malfunctions, and the
LCD will return to normal when the temperature
returns to within the specified operating range.