Trouble shooting
20220505H
109
6
TROUBLE SHOOTING
An autopilot is a complex system and the performance is
dependent of a proper installation and a successful sea trial.
In the event of a failure, you will be helped by the AP20
software which contains several test features that will assist you
in isolating a probable fault.
Audible and visual alarms are given in the event a fault is
detected.
The audible alarm is reset by pressing any button (e.g. by
changing mode from AUTO to STBY). The visual alarm will
remain and alternate with the operating display until the fault has
been rectified. Refer to the table below for hints and try to solve
the problem yourself, or consult your nearest Simrad dealer for
assistance.
Perform the repair action in the listed order.
6.1
Alarms
Display
readout
Probable fault
Recommended action
System failure Alarms:
Rudder
feedback
failure
(autopilot
operates on
simulated
feedback)
Rudder feedback
signal missing or
erratic
1. Check all connections.
2. Check the alignment as per the
installation instructions
3. Replace rudder feedback unit.
Rudder
response
failure
No response to rudder
command.
1. Check all connections
2. Check Rudder FB transm. link.
3. Check Drive unit motor/brushes.
4. Replace junction unit Power PCB.
Rudder test
too slow
Excessive load on
steering gear. Air in
hydraulic system.
Insufficient drive unit
capacity.
1. Look for mechanical obstructions at
the rudder/tiller/quadrant.
Check the back drive force.
2. Bleed the hydraulic system.
3. Replace with bigger pump unit.