Simrad AP26, AP27 manual Acxx

			Trouble shooting
Display readout	Probable fault	Recommended action
Failure active	Active control unit	1.	Press the STBY button on an
Control Unit	goes silent.		"Inactive" unit to reset.
		2.	Check/repair Robnet2 cable.
		3.	Replace the control unit PCB.
ACXX current	The drive unit shut	1.	Check the drive unit and drive unit
overload	down due to an		installation/Manual steering/
	excessive load or a		Rudder.
	short circuit.	2.	Disconnect the drive unit. If the
			fault is still present, replace the
			Autopilot Computer Power PCB.
Low 15 volt	Internal 15 Volt	1.	Replace Autopilot Computer Main
	supply in Autopilot		PCB
	Computer below	2.	Replace Autopilot Computer
	limit.		Power PCB if Mains voltage is
			12V.
Bypass/clutch	Clutch/bypass	1.	Check actual current
overload	current exceeds 2,5	2.	Check voltage marking on coil
	Amps (overload or	3.	Check coil resistance (through
	short circuit).
			connecting wires)
Bypass/clutch	Poor connection or	1.	Check connections
disengaged	open circuit in	2.	Replace bypass/clutch if open.
	bypass/clutch coil
		3.	Perform new "Rudder test".
ACXX high	Excessive	1.	Switch off autopilot
temp.	temperature in	2.	Check for backload in Drive
	Autopilot
			unit/steering system.
	Computer (>75°C),
		3.	Check that the autopilot computer
	possible long term
	overload.		specifications matches Drive unit.
Memory failure	Wrong checksum	Perform a "Master reset" and make a
ACXX	on memory	new "Dockside set-up". Switch off
	parameters or	and on again. If the alarm is repeated,
	variables.	replace Autopilot Computer Main
	Autopilot	PCB.
	Computer will use
	default values.

20221586B 121