Simrad AP20 - Page 116

Simrad AP21 and AP22 Autopilots
114 20220596G
Display
readout
Probable fault Recommended action
Rudder test
failed
Following conditions
may exist:
a) Rudder feedback
failure
b) J3XX current
overload
c) Bypass/clutch
overload
Refer to recommended actions for the
specific probable faults.
Rudder moves in one
direction only
Poor connection to
one of the
solenoids
(continuously
running pump)
Faulty Power PCB in
junction unit
a) Check connections
b) Replace PCB
Rudder test
failed
(cont’d)
Rudder test not
completed within 2
min.
a) Poor connections
to drive unit
b) Faulty Main PCB
in junction unit
c) Faulty Power PCB
in junction unit
a) Check connections
b) Replace PCB
c) Check PCB for traces of burnt
transistors. – Change PCB.
Rudder moves at full
speed to one side.
a) Faulty Power PCB
in junction unit
Replace PCB