8-3-2 Section 8: Autopilots
ST290 Instrument System Owner’s Handbook
3.2 Fixing faults
Fault Possible cause Action
Rudder bar display moves in oppo-
site direction to rudder.
Rudder position sensor connec-
tions are connected the wrong
way round.
Reverse the red and green rudder
position sensor connections at the
course computer.
Displayed compass heading does
not agree with the boat’s com-
pass.
Compass not calibrated. Carry out the compass alignment
and deviation procedures.
The autopilot will not communi-
cate with other SeaTalk instru-
ments.
A break in the SeaTalk cabling con-
nection
or
SeaTalk fuse failure.
Ensure all SeaTalk cables are
sound and connected properly.
Replace SeaTalk fuse in course
computer.
Waypoint information not
received.
Navigator not transmitting the
correct data.
Ensure navigator is operating cor-
rectly.
Check wiring between navigator
and autopilot systems.
For NMEA connected navigators,
check that the output is enabled at
the navigator.
When holding a constant course in
Standby mode, the autopilot
heading changes continuously.
There may be magnetic interfer-
ence on the compass.
There may be a fault with the com-
pass.
Check there are no electrical, mag-
netic, or metallic objects near the
compass unit.
Move the compass to another
location.
Carry out the compass alignment
and deviation procedures.
Call a Raymarine service agent.
Boat turns slowly and takes a long
time to come onto course.
Rudder gain too low
(see Section 8, Chapter 5).
Complete AutoLearn or increase
setting.
Boat overshoots when turning
onto a new course.
Rudder gain too high
(see Section 8, Chapter 5).
Complete AutoLearn or decrease
setting,
The autopilot appears to be unsta-
ble in Track mode, or track-holding
is slow.
Tide speed exceeds 35% of boat
speed, and boat speed is not avail-
able via SeaTalk.
Change the CRUISE SPEED setting
in Pilot Advanced Calibration to
the boat’s cruising speed
(see Section 8, Chapter 5).
81183_2 S8.book Page 2 Tuesday, May 6, 2003 9:08 AM
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