ComNav 2001 - Page 60

ComNav 2001 Autopilot System
P/N 29010017 V1.0 - 60-
Gyrocompass Input Error
- This alarm is triggered if all three input lines
from the gyrocompass go high or low
simultaneously, and do not return to normal
within two seconds. The autopilot will switch
back to the magnetic compass, steering the
heading that the magnetic compass was on at
the time of the gyrocompass failure. This
ensures that the vessel will continue steering a
straight course. If the gyrocompass returns to
normal operation, the heading on the autopilot
must be reset to match the master
gyrocompass heading. This alarm is only
applicable to autopilots fitted with the optional
universal gyrocompass interface.
Faulty Interrupt in U8 on Computer circuit board
- The autopilot has detected a fault with the
6821 I/O chip part number U8. Normal
operation of the autopilot should still be
possible, but caution should be exercised until
the autopilot can be returned to an authorized
service centre to have the fault rectified.
Faulty Interrupt in U9 on Computer circuit board
- The autopilot has detected a fault with the
6821 I/O chip part number U9. Normal
operation of the autopilot should still be
possible, but caution should be exercised until
the autopilot can be returned to an authorized
service centre to have the fault rectified.
No Compass Data Error
- The computer is not receiving any data from the
compass. Check that the compass is plugged into the
autopilot. The autopilot is operable in non-autopilot
modes only (ie. STANDBY or POWER STEER).
Check that the autopilot is programmed for the correct
type of compass (see DOCKSIDE SETUP for
information).