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HOLUX Wireless GPS Logger M-241 User’s Manual
37
15. Troubleshooting
Problems Possible Reasons Methods
Weak or no GPS signal at the
place of M-241
Test under an open sky at a fixed location
and run the Mini GPS Viewer “Cold start”
function.
No GPS
output but
GPS timer is
counting
The ephemeris and almanac data
in the GPS memory are no longer
valid after an extended period of
nonuse.
Remove the Battery for 120 seconds and
re-insert, then power on to test again.
This operation is the same as “Cold Start”.
Bluetooth
execute fail
Bluetooth function unstable
Power On/Off M-241.
Re-Start PDA or PC and refer to section
10 “Bluetooth device connection
installation” to re-connect.
Cannot open
the COM port
Bluetooth connection interrupted
or COM port is conflicted/occupied
by other programs.
Check the Bluetooth connection again,
Check and close other programs that
might conflict with.
No display Battery low Please check battery.
No acquisition Please move to open sky to reacquisition.
Log mode is by distance, so it
won’t record if no movement.
Change log mode to “by time”
Logger
function on,
but no POI
recorded
log mode is by long interval
Ensure you interval setting meet your
situation.
Velocity and
position
shifting when
static
Because the satellite signal may
be shifted easily due to the
interference when the moving
speed is less than 10 km/hr or
under the environment with tall
buildings that the satellite signal is
not good,
It’s a GPS character , just move to open
sky area to get better GPS signal.
Logger
function can’t
work
When device is suddenly shut
down in flash memory erase
process, the initial process of flash
will be failed.
Power on again to erase.