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Simrad AP20 Autopilot
Display
Probable fault
readout
Rudder test
Following conditions
failed
may exist:
a) Rudder feedback
failure
b) J3XX current
overload
c) Bypass/clutch
overload
Rudder moves in one
direction only
Poor connection to
Faulty Power PCB in
junction unit
Rudder test
Rudder test not
failed
completed within 2
(cont'd)
min.
a) Poor connections
to drive unit
b) Faulty Main PCB
in junction unit
c) Faulty Power PCB
in junction unit
Rudder moves at full
speed to one side.
a) Faulty Power PCB
in junction unit
110
one of the
solenoids
(continuously
running pump)
Recommended action
Refer to recommended actions for the
specific probable faults.
a) Check connections
b) Replace PCB
a) Check connections
b) Replace PCB
c) Check PCB for traces of burnt
transistors. – Change PCB.
Replace PCB
20220505H
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