Chapter 3: Functional Test 793.8 Mechanical Test (Stern Drive)It is recommended that the Auto Release facility is used when a Autohelmmechanical stern drive actuator is installed. This should be switched on incalibration.1. Manually drive the steering hardover to starboard2. With the engines running, engage Auto and, with repeated presses ofthe -10 degree key, drive the steering to the opposite lock (port).3. The autopilot should drive the steering onto the end stops, sound analarm, display the 'Release' message and then revert to 'Standby'.4. Re-engage the autopilot (Auto) and repeat the driving the steeringhardover to starboard using the +10 degree key.5. The autopilot should again drive onto the end stop, sound an alarm,display 'Release' and return to 'Standby'.Note: If the unit sounds the alarm and displays Release before reachingthe opposite lock, carefully check the vessel’s steering system for anystiffness or mechanical jamming.If the condition persists, set the Auto Release function to “off” (0) incalibration and contact the Product Support Department at Autohelm forfurther advice.Note: The Auto Release function should always be set to “off” (0) incalibration if using any drive unit other than a stern drive actuator.3.9 Setting the Autopilot Rudder Limit (All drives)Having checked the correct functioning of the drive unit and the appropri-ate End Stop Cutout/Auto Release function the programmable rudderangle unit should be set.The rudder angle limit sets the maximum angle to which the autopilot willmove the rudder. This should be set to just less than the vessel’s mechani-cal limit stop to avoid putting the steering system under unnecessary load.Using the rudder angle display whilst manually moving the helm, recordmaximum rudder angle in both directions. Set up the rudder angle limit incalibration mode (see page 82) to 5 degrees less than the minimum anglerecorded.