Simrad AP28 Operator's Manual page 114

Display
readout
Bypass/clutch
overload
Bypass/clutch
disengaged
ACXX High
temperature
ACXX Memory
failure
No Autopilot
computer
Low drive
supply
High drive
supply
Depth data
missing
Wind data
missing
Wind shift
114 | Troubleshooting
Probable fault
Clutch/bypass current
exceeds 3.3 Amps (overload
or short circuit)
Poor connection or open
circuit in bypass/clutch coil
Excessive temperature in
autopilot computer
(>80°C), possible long term
overload
Wrong checksum on
memory parameters or
variables. Autopilot
computer will use default
values
Faulty autopilot computer or
poor cable connections from
the same
Supply voltage less than 9
Volts
AC12/AC42 Supply exceeds
35 Volts
Missing or invalid depth
data
Missing or invalid wind data
Wind shift exceeds 'Wind
shift limit'
Recommended action
Check actual current
Check voltage marking on coil
Check coil resistance (through
connecting wires)
Check connections
Replace bypass/clutch if open
Perform new "Rudder test"
Switch off autopilot
Check for backload in Drive
unit/steering system
Check that the autopilot
computer specifications
matches Drive unit
Perform a "Master reset" and
make a new "Dockside set-up".
Switch off and on again. If the
alarm is repeated, replace
autopilot computer
Check connectors and cable
Replace autopilot computer
Switch autopilot off, charge
batteries
Check/repair battery charger
Switch the autopilot off
Check/repair battery charger
Check depth sensor/cables
Check wind sensor/cables
Re-enter Wind mode to reset
the Wind shift reading
Expand limit
Set wind shift limit to Off