Problem
Solution
GPS
GPS signal reception is weak or
failing.
Perform GPS positioning again with the device outside with no
obstructions overhead for 15 minutes.
U
“GPS signal reception (GPS positioning)” on page 27
Go to a location outside with no obstructions overhead. GPS
signals cannot be received while indoors. Obstacles partially
blocking the sky, such as tall buildings and mountain sides, can
also interrupt signal reception, which results in reduced distance
accuracy.
GPS signal reception is weak or
interrupted.
Even when a signal is being received, it may be interrupted
depending on the running environment.
Wear the device on the outside of your arm. Also, make sure the
strap is tightened.
Charging
The device does not charge after
attaching the USB Charging clip.
Check the USB Charging clip connection.
Clean the contact points of the device and USB Charging clip.
U
“Main device and band” on page 80
❏
The charge screen may not appear for 1 to 2 minutes after
attaching the USB Charging clip when the battery is
completely exhausted. This is not a malfunction.
❏
A malfunction may have occurred if you cannot charge the
device even after checking the points above. If this
happens, immediately stop trying to charge the device and
send the main device and USB Charging clip to our repair
center.
The charge error screen is
displayed.
Charge in environments with ambient temperatures of 5 to 35˚C.
The main device and USB
Charging clip become hot during
the charging process.
There may be a malfunction. Stop charging the device
immediately and contact our repair center.
Water resistance
Can I use the device when
swimming?
This device is water resistant up to 5 bars of pressure and can be
used while swimming. However, do not press any buttons while
the device is underwater. The device cannot receive GPS signals
while underwater.
The inside of the glass becomes
cloudy.
Condensation may occur in the device due to differences in
temperature between the device and the open air. Temporary
condensation does not have any effect on the device. You may
continue using the device in this situation.
If the condensation
remains for a long time, water may have entered the device.
Send the device to our repair center.
Communication
The device is not recognized by
the PC when connected.
Check the connection between the PC (USB port) and USB
Charging clip (USB plug). Clean the contact points of the device
and USB Charging clip.
U
“Main device and band” on page 80
Perform a system reset.
U
“Performing system resets” on page 87
J-347/367, U-350 User Manual
Regular Maintenance
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