Troubleshooting
20222410 / B 115
7 TROUBLESHOOTING
Audible and visual alarm is provided for every fault being
detected. In the event of an autopilot failure, the AP50’s
numerous test features will assist you in isolating a probable
fault. Refer to the AP50 Operator Manual.
In the unlike event of a failure in the JD5X, observe the status of
the different LED’s according to the table below.
7.1 Solenoid control
For component references refer to the D9X Solid State Board,
Component layout,
Figure 2-16.
Display readout Probable fault Recommended action
Open solenoid
command lines. I.e.
LD3/LD4 are lit for
rudder commands.
− Check TB16 for correct jumper
setting.
− Check fuse F1 and F2.
− Check correct setting of S4-S7
− Check that LD5 is OFF; if ON check
correct setting of HL-jumper or look
for short circuit or steering gear
solenoid failure.
Fault on J50 Power
board or open internal
connection.
I.e. LD3/LD4 are not
lit for rudder
commands.
− Check that solenoid LEDs on J50
Power board are lit when commands
are given (ref. page 17).
− If OK, check internal wiring from J50
Power board (Solenoid isolated
Hi1/Hi2) to D9X TB13 1/2.
No power to the D9X
Solid State Board.
− LD1 to be lit. If not, check correct
setting of S1-S3 switch. Check for
board supply 26-40V DC between J1-
7 and J1-9 (ref. Figure 2-16).
Defective safe relay
function.
− If LD2 is off when LD1 is on; replace
board.
No rudder
response
Steering gear not
operative or defective
rudder feedback.
− Ref. Trouble shooting section in
AP50 Operator manual.
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