Simrad AP25 Manual page 143

Display readout
Rudder test failed Following conditions
20221495F
Probable fault
may exist:
a) Rudder feedback
failure
b) Autopilot
Computer current
overload
c) Bypass/clutch
overload
Rudder moves in only
one direction
a) Poor connection to
one of the
solenoids
(continuously
running pump)
b) Faulty Power PCB
in autopilot
computer
Rudder test not
completed within 2
min.
a) Poor connections
to the drive unit
b) Faulty Main PCB
in the Autopilot
Computer
c) Faulty Power PCB
in the Autopilot
Computer
Rudder moves at full
speed to one side.
a) Faulty Power PCB
in Autopilot
Computer
Recommended action
Refer to recommended actions for
the specific probable faults.
a) Check the connections
b) Replace the Autopilot Computer
Power PCB
a) Check connections
b) Replace the Main PCB
c) Check the Power PCB for traces
of burned transistors. – Change
Power PCB.
Replace Autopilot Computer Power
PCB
Trouble shooting
141