Simrad AP26, AP27 Display readout Probable fault Recommended action, User Setup2/Source select

			Trouble shooting
Display readout	Probable fault	Recommended action
Shallow water	The depth is inside	1.	Carefully observe the actual
(Only if AP25 is	the set limit or outside		depth.
part of the	the range.	2.	Adjust the alarm limit if not
system)	Depth data is missing.		hazardous.
		3.	Steer to safe depth, the alarm
			will reset automatically.
		4.	Turn off the shallow alarm if
			depth data is missing.
Compass data	No data from selected	1. If more that one compass is
missing	compass.		connected to the system, refer to
			the User Setup2/Source select
			menu to select a different
			compass.
		2. Make a source update if no
			compass is available.
		3. Check connections.
		4. Replace compass PCB (Note: Do
			not cut cables. There are screw
			terminals inside).
Rudder feedback	Rudder feedback	1.	Check all connections.
failure (autopilot	signal missing or	2.	Check the alignment as per the
operates on	erratic		installation instructions
simulated		3.	Replace rudder feedback unit.
feedback)
Rudder response	No response to rudder	1.	Check all connections
failure	command	2.	Check Rudder FB transmission
			link.
		3.	Check drive unit motor/brushes.
		4.	Replace the Autopilot Computer
			Power PCB.
Rudder too slow	Excessive load on	1.	Look for mechanical
	steering gear. Air in		obstructions at the rudder/tiller/
	hydraulic system.		quadrant. Check the back drive
	Insufficient drive unit		force.
	capacity.	2.	Bleed the hydraulic system.
		3.	Replace with bigger pump unit.

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