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Resetting The Unit - Sony NV-U51 Quick Start Manual

Nav-u series personal navigation system
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The built-in battery cannot be charged.
t Check that the POWER switch on the bottom right
of the unit is in the ON position.
t If the AC power adapter is being used, disconnect it
from the outlet, then reconnect.
t 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.
GPS signal cannot be received.
Firstly, read the GPS overview (page 4), then check the
GPS status by selecting "More..." in the top menu c
"GPS Status."
• The system cannot receive GPS signals due to an
t Move your car to a place where signals can be
received clearly.
• GPS signal reception is low.
t The optional External GPS Antenna VCA-41
may be required for a heated or heat reflective
• There is an obstacle in front of the GPS aerial.
t Install the unit where the signal is not interrupted
by the body of the car, etc.
• Signal may not be received if a window film is
t Use the optional External GPS Antenna VCA-41.
The car position on the map does not match
the current road.
The error margin of the signal from the GPS satellites
is too large. A maximum error margin of a few
hundred metres can exist.
Voice guidance cannot be heard.
The volume is set too low.
t Raise the volume (page 10).
When the unit is powered by the built-in battery,
volume may slightly decrease.
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.
• The LCD is dark.
t The auto dimmer function may be activated
because its sensor 7 (page 5) is covered by a
hand, etc.
The cradle comes off the attachment surface.
Attachment strength weakens if the surface of the
suction cup or attachment surface becomes dirty.
t Wash and clean the suction cup and the attachment
surface (page 14).
The demonstration mode starts automatically
even if no operation is performed.
t Turn off the auto demonstration mode by selecting
"More..." in the top menu c "Settings" c "General
Settings" c "Demo Mode." Then, confirm that
"Demo Mode" is set to off.

Resetting the unit

If the navigation software freezes, try resetting
the unit.
Switch off the main power by sliding the
POWER switch to the OFF position, then switch
on again after approximately 10 seconds.
After you switch off the main power, it may take time to
receive GPS signals when switching on again.


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