NorthStar 961 Install Manual page 47

Table 2: Troubleshooting the installation (continued)
Symptom
Processor
(Configuration)
No GPS or DGPS
DGPS
There's no DGPS indicator on the CHART screen, and:
The BEACON RX SELF-TEST AND
SOFTWARE message displays
(
press the key to access the
SERVICE MENU screen, then press the
key).
The BEACON RX SELF-TEST AND
SOFTWARE message displays
DGPS STATUS
the message displays
SEARCHING
.
The BEACON RX SELF-TEST AND
SOFTWARE displays PASS, and the DGPS
STATUS message displays OLD
.
CORRECTIONS
The BEACON RX SELF-TEST AND
SOFTWARE displays PASS, and the DGPS
STATUS message displays POOR DOPS
BCN UNHEALTHY is displayed.
961/962 INSTALLATION MANUAL Revision A
Possible solutions/reasons
•
Possible incorrect installation of the AS110/AS105 splitter
cables; they may be reversed at the splitter for the GPS and
DGPS output ports going to the 961XD
•
For verification and troubleshooting of the antenna system,
see Table 3, "Troubleshooting the GPS/DGPS antenna
installation," on page 39.
• The processor's BIOS may be improperly configured. This
normally won't occur unless the BIOS memory battery has
failed or the BIOS settings were intentionally changed. Call
the Northstar Service Department for information on
troubleshooting and correcting this problem.
•
Wait 30 minutes after start-up (only if a new unit).
FAIL
•
Check for an open or shorted beacon-antenna cable
connector.
• Check for proper ground.
•
The Northstar 8410 ACU or the 961
defective; call the Northstar Service Department.
• Wait 30 minutes after start-up (only if a new system) so the
PASS
, and
receiver can find a differential transmitter within range (check
local knowledge of transmitters).
•
Check for high noise level, possibly due to a storm front, or
for local interference at the marina or on the vessel. For
details about noise-level meanings, see the Northstar 961/
962 Operations and Reference Manual (GM1900).
• Turn off power to each and all of the vessel's other
instruments, one at a time, to isolate the source of the
interference.
•
Try manually selecting and setting a DGPS beacon station to
see if the signal can be received.
•
Consult the Coast Guard's Local Notice to Mariners to
determine if there may be a scheduled maintenance outage
for the station you're trying to use.
• For additional guidance, call the Northstar Service
Department.
•
No DGPS corrections have been received, and the system
has returned to non-differential operation. You may be out of
range of a transmitter, or if you're experiencing bad weather,
noise may be interfering. In either case, you must wait.
•
Wait for the satellite configuration to automatically update,
which should only take a few minutes.
.
•
Wait—the transmitter is switching to another beacon. You
can try manually switching to another transmitter.
SECTION TWO - Installation
/ 962XD processor.
/ 962 processor may be
Page 37