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Chapter 14 - Service and Maintenance Functions
Viewing head 2 serial number and software revision
For systems with two control heads, each head has its own
serial number located at the back of the unit. You can view
this serial number at the PRODUCT INFORMATION screen, in
the HEAD 2 SN/SW REVS field.
Processor serial number and software revision
The serial number of the processor is affixed to the back of the
unit, and also has been permanently programmed into the
unit's database. You can view this serial number at the PROD-
UCT INFORMATION screen in the PROCESSOR SN/REV field.
Serial numbers ending with the letter D indicate that the unit
contains an internal DGPS differential receiver.
Beacon receiver self-test and software revision
The 961 automatically self-tests the internal beacon receiver, if
installed, each time you power-up the unit. The BCN RCVR
ST/ REV field displays the software version used by your 961's
DGPS receiver (if installed), as well as the self-test message
PASS or FAIL. If all test parameters are met, the field says
PASS. If the differential receiver fails any of the test criteria,
the field says FAIL. If the field says FAIL, the 961 won't be
receiving DGPS signals; for details about troubleshooting the
DGPS receiver, see the Northstar 961 GPS Chart Navigator
Installation Manual. In many cases, the reason for the failure is
an open or shorted antenna cable, which can be repaired in
the field. If this isn't the source of the failure, call the Northstar
Service Department for further instructions.
If a beacon receiver isn't installed, this field is blank.
GPS receiver self-test and software revision
The GPS RCVR ST/REV field displays the software version
used by your 961's GPS receiver, as well as the self-test mes-
sage PASS or FAILED. This field should read PASS, not FAIL. If
the 961 displays the message FAIL, return the 961 to Northstar
for service.
961 Operations and Reference Manual Rev. D
Page 14-3
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