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Trouble Shooting
22081814H 115
Display readout Probable fault Recommended action
J3XX current
overload
Drive unit shut
down due to
excessive load or
short circuit.
1. Check Drive unit/Drive unit
installation/Manual steering/Rudder
2. Disconnect Drive unit. If fault still present,
replace junction unit Power PCB.
Low 15 volt
Internal 15 Volt
supply in Junction
Unit below limit.
1. Replace junction unit Main PCB
2. Replace junction unit Power PCB if Mains
voltage is 12V.
Bypass/clutch
overload
Clutch/bypass
current exceeds 2,5
Amps (overload or
short circuit).
1. Check actual current
2. Check voltage marking on coil
3. Check coil resistance (through connecting
wires)
Bypass/Clutch
disengaged
Poor connection or
open circuit in
bypass/clutch coil
1. Check connections
2. Replace bypass/clutch if open.
3. Perform new "Rudder test".
J3XX high temp.
Excessive
temperature in
Junction Unit
(>75°C), possible
long term overload.
1. Switch off autopilot
2. Check for backload in Drive unit/ steering
system.
3. Check that Junction unit specifications
matches Drive unit.
Data failure
J3XX
Wrong checksum
on memory
parameters or
variables. Junction
unit will use
default values
Perform a "Master reset" and make a new
"Dockside set-up". Switch off and on again. If
the alarm is repeated, replace Junction unit
Main PCB.
Com. failure
with J3XX
Junction Unit faulty
or possible poor
connections in
Robnet cable from
same.
1. Check Robnet connectors and cable.
2. Replace Junction unit Main PCB.
Low supply
voltage
Mains voltage less
than 9 Volts
1. Verify by System Data Menu
2. Switch autopilot off, charge batteries
3. Check/repair battery charger
High supply
voltage
J300X, J300X-40
Mains exceeds 44V.
J3000X Mains
exceeds 29V
1. Verify by System Data Menu
2. Switch autopilot off
3. Check / repair battery charger
117


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