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3000LRS DGPS RECEIVER
OPERATOR’S MANUAL
A Product of the Fugro Group of Companies
Issue 2.00 JUNE 2003
B11203400PMBRA0 / 25
Appendix E
Troubleshooting
Receiver not powering on
Possible cause
Faulty Antenna/antenna cable
Solution
Disconnect antenna cable from 3000LRS unit
and try again
Possible cause
Faulty power supply or supply cable
Solution
Try alternative power supply, ensure polarity is
correct
“FREQ SEARCH” “SWEEPING” continuously displayed on display
Possible cause
System incorrectly configured
Solution
Check in menu ‘Channel Selection’ that correct
uplink is selected. Refer to Appendix D for
uplink channel coverage diagram
Possible Cause
DGPS antenna is obstructed
Solution
Ensure that the DGPS antenna is clear of
obstructions
Possible cause
Faulty DGPS antenna or antenna connection
Solution
Check antenna connections or exchange DGPS
antenna
Receiving differential signal, but no position on
LRS8S
/
LRS12S
Possible cause
System not used for a long period of time or has
travelled a large distance since last use
Solution
Wait 30 minutes for GPS engine to gain new
almanac
Possible cause
System incorrectly configured
Solution
Ensure IGPS rate within ‘User Settings’ menu is
set to correct baud rate of internal GPS card.
8 Channel – 4800, 8,N,1
12 Channel – 9600,8,N,1