ComNav 1500 - Page 59

ComNav 1500 / 1510 Autopilot - 52 -
SYMPTOM CAUSE ACTION
Rudder Transmitter is defective
(noisy).
Replace Rudder Transmitter or
potentiometer within.
Check for loose or broken wires
in terminal strips.
Reconnect tightly.
Rudder Angle Indicator is
displaying erratic values.
Check for broken wires in
cables.
If wiggling of cable where it flexes
causes rudder activity, replace cable.
Rudder control set too high. Decrease Autopilot setting [P1]
[RUD]
Boat overshoots on large
course changes.
Counter rudder set too low. Increase Autopilot setting [P3]
[CRD]
If constant error, Autopilot
compass is not aligned with
foraft line of boat.
Use compass setting [C6] [ADJ] to
adjust alignment of compass.
Variable error in heading caused
by magnetic interference.
Verify that the steering compass is
accurately corrected and then
correct the Autopilot compass as per
installation instructions.
Larger errors not corrected by
above remedies or lack of
change in course set point with
different headings indicate a
defective compass.
1. Run Auto-Deviation-Clr [C5]
[CLR]
2.
Run Auto-Deviation [C3] [DEV]
3. Recheck compass again.
Ships compass is not correct. Compensate ships compass.
Compass: no reading or wrong
heading.
Check that the local magnetic
variation [C2] [VAR] is set properly.
Course set on Autopilot
instrument is different from
ship’s steering compass.
Irregular values. Check the Sea Damping [P2] [SEA]
NMEA receiver not installed
correctly.
Check receiver settings for proper
output.
No NMEA 0183 data received. Check Nav cable for connection to
the correct port.
Unreliable NMEA data detected
upon engagement.
Check connections and setup in
transmitting instrument.
NMEA does not engage, NAV
arrow does not come on.
No active waypoint. Activate a waypoint.
After some use, NAV arrow
does not come on.
Poor NMEA data detected. Last
“good” NMEA heading is used
until good data restored.
Check for poor navigator installation
causing bad signal to noise ration.
Check for erroneous data as
detected by navigator. Revert to
magnetic course only, if situation can
not be corrected.
May appear when close to
waypoint due to GPS-S/A error.
Accept situation, or revert to
compass course steering only.
Course under NAV steering is
erratic.
Compass heading information is
not consistent with navigator.
Set heading type in Autopilot to
match output from Navigator. (i.e.,set
to true if Navigat outputs true. Set to
magnetic if Navigator outputs
magnetic).