Troubleshooting in theField 7
Message Problem Solution
No GNSS Receiver
Data
There has been no GNSS data
coming from one or both GNSS
receivers for at least 1.5seconds.
This could be caused by:
l different firmware versions
on the GNSS receivers of a
dual GNSS system
l a problem with a GNSS
receiver
l a cabling fault
l a problem with a GNSS
receiver configuration
To check that the GNSS receivers have been detected
and that the firmware versions are the same, use the
procedure in 7.3 Running system diagnostics.
To check that the receivers are powered, use the
information in 7.6.2 GNSS receiver status indicators.
Check the cable, power, and connections. Check the
physical condition of the GNSS receivers.
Turn off the control box and turn it back on.
If problems continue, contact your site supervisor.
Old Position A position is not being generated
by one, or both, GNSS receivers.
To check that the GNSS receivers have been detected,
use the procedure in 7.3 Running system diagnostics,
particularly 7.3.2 GNSS diagnostics and satellite
monitoring.
To check that the receivers are powered, use the
information in 7.6.2 GNSS receiver status indicators.
Check the cable, power, and connections. Check the
physical condition of the GNSS receivers.
Very Low Accuracy
(GNSS)
The system is receiving
autonomous GNSS positions from
one or both GNSS receivers.
To check that the data radio has been detected, use the
procedure in 7.3 Running system diagnostics.
To check that the radio is powered and synchronized, use
the information in7.6 Troubleshooting system
components
Check that the channel setting for the radio matches that of
the base station.
Check the data radio cable.
Ask your site supervisor to check that the GNSS base
station and any repeaters in the radio network are working
correctly.
Out of Geoid Range The GNSS position is out of the
range of the loaded geoid grid.
Move the machine into range or contact your site
supervisor.
GCS900 Grade Control System for Excavators Operator's Manual 169
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