Service manual

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SMARTFIND NAVTEX service manual Page 24
5. FAULT FINDING
5.1. On-ship fault finding
No NAVTEX reception
Active antenna fitted;
Is 12V dc present on the antenna TNC connector socket?
NO - check that it is enabled in Setup mode – Receiver options,
“Antenna power enabled”.
Active or Passive or wire antenna fitted;
Verify antenna integrity, check cable and connecters for damage.
Bad UTC or bad date displayed (with GPS connected)
Note, if no GPS is connected the clock and date will stop on power down and must
be reset by the user when next powered up. But if relevant UTC data is detected on
the data input at power up it will override the pervious manual UTC and date settings
automatically and correct the system clock time and date.
1. Confirm that the GPS is outputting relevant IEC 61162 sentences.
SMARTFIND NAVTEX supports IEC 61162 & 61097-6 (NMEA)
protocols. Refer to APPENDIX 2: MESSAGE STRUCTURES for detail.
The source of UTC used to update the system date and clock can be
extracted from various IEC 61162 sentences. Use the Setup Mode –
Serial options to select required sentence ZDA,GGA,RMC, or GLL (in
order of preference).
2. Check for live serial data in the SMARTFIND NAVTEX Serial Options
setup page, serial monitor window. If data can be seen then the
interface problem is not likely to be hardware or signal level related
issue.
3. Try turning off the ‘NMEA Checksums Required’ setting (Serial Options
setup page).
Note. it is recommended to re-enable ‘NMEA Checksums Required’
once fault finding is completed and the reason for the problem is
resolved.