Sperry Marine 4914-CA, Operation, Installation And Service Manual

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13. If a visual inspection reveals no obvious cause for malfunction,
repeat the complete power-up procedure and check again if after
around 45 minutes after the second power-up cycle the gyrosphere
current has dropped below 320 mA.
⇒
If after around 45 minutes after the second power-up cycle the cur-
rent is still above 320 mA, and no other obvious cause of malfunc-
tion is found, the gyrosphere may not be in operable working
condition:
– Contact the Sperry Marine Service for advice.
⇒
If after around 45 minutes after the second power-up cycle the gyro-
sphere current has dropped below 320 mA, the gyrosphere is in in
operable working condition.
14. Note the exact gyrosphere current value in the setup tables.
15. After a settling time of at least 4 hours, verify that the gyrocompass
has settled to the correct heading.
– Check whether the setting of the shaft encoder correction value
in the Service Setup 1 of manual 056343 matches with the value
indicated on the baseplate.
– In case of a first time installation, check that the heading shows
the correct value approximately, taking into account any existing
misalignment of the gyrocompass. Then, set the alignment error
correction value in the Service Setup 1 as required, see “Align-
ment Error Correction” of manual 056343 for details. After the
alignment error correction value has been set, the gyrocompass
is to display the vessel's true heading with an accuracy of ± 0.5°.
– In case of maintenance or replacement of the gyrosphere, the
displayed heading should now already be accurate within ± 1.0°.
If necessary, adjust the stored alignment error correction value,
so that the gyrocompass displays the vessel's true heading with
an accuracy of ± 0.5°, see “Storing the magnetic compass head-
ing calibration table” of manual 056343 for details.
16. In case of a regular maintenance, or if a defective gyrosphere has
been replaced, a special service setup menu must now be called up
to reset the gyrosphere operation time counter.
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The 4 hours settling time for the alignment is only mandatory in case of
a first time installation of the NAVIGAT X MK 1.
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To verify the gyrocompass’ heading, the actual true heading of the vessel
should be known with an accuracy of ± 0.1°.
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The access code for the setup menu to reset the gyrosphere operation
time counter is disclosed to authorized service personnel only and is not
described in this service procedures.