Simrad AP28 Operator's Manual page 113

Display
readout
Rudder test
failed
No active
control unit
Rudder Drive
overload
Probable fault
Following conditions may
exist:
Rudder feedback failure
Autopilot Computer current
overload
Bypass/clutch overload
Rudder moves in only one
direction
Poor connection to one of
the solenoids (continuously
running pump)
Faulty PCB in autopilot
computer
Rudder test not completed
within 2 min.
Poor connections to the
drive unit
Faulty PCB in the Autopilot
Computer
Rudder moves at full speed
to one side.
Faulty PCB in Autopilot
Computer
Active control unit goes
silent
The drive unit shut down
due to an excessive load or
a short circuit
Recommended action
Refer to recommended actions
for the specific probable faults
Check the connections
Replace the autopilot computer
Check connections
Check the PCB for traces of
burned transistors. – Replace
the autopilot computer
Replace the autopilot computer
Press the STBY key on an
"Inactive" unit to reset
Check/repair SimNet cable
Replace the control unit
Check the drive unit and drive
unit installation. Look for
mechanical obstructions. Check
the manual steering
Disconnect the drive unit. If
the fault is still present,
replace the autopilot computer
Troubleshooting | 113