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Probable fault
readout
Compass data
No data from
missing
selected compass.
Comm. failure
Active control unit
active Cntrl
goes silent.
J3XX current
Drive unit shut
overload
down due to
excessive load or
short circuit.
Low 15 volt
Internal 15 Volt
supply in Junction
Unit below limit.
Bypass/clutch
Clutch/bypass
overload
current exceeds 2,5
Amps (overload or
short circuit).
Bypass/clutch
Poor connection or
disengaged
open circuit in
bypass/clutch coil
J3XX high
Excessive
temp.
temperature in
Junction Unit
(>75°C), possible
long term overload.
20220505H
Recommended action
1. If more that one compass is
connected to the system, refer to the
USER SETUP menu to select a
different compass.
2. Check connections/Interface menu.
3. Replace compass PCB or interface
PCB (Note: Do not cut cables. The
PCB contains screw terminals).
1. Press STBY button on "Inactive"
unit to reset.
2. Check/repair Robnet cable.
3. Replace control unit PCB.
1. Check Drive unit/Drive unit
installation/Manual steering/ Rudder
2. Disconnect Drive unit. If fault is still
present, replace junction unit Power
PCB.
1. Replace junction unit Main PCB
2. Replace junction unit Power PCB if
Mains voltage is 12V.
1. Check actual current
2. Check voltage marking on coil
3. Check coil resistance (through
connecting wires)
1. Check connections
2. Replace bypass/clutch if open.
3. Perform new "Rudder test".
1. Switch off autopilot
2. Check for backload in Drive
unit/steering system.
3. Check that Junction unit
specifications matches Drive unit.
Trouble shooting
111
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