[CA] [CA11] rudder indicatation stuck on hard over, rudder sensor ok

[cgold]

I have a system with an ST6000+ control head, a type 300 computer, a rotary rudder sensor, type 2 linear drive, and flux gate compass. System has been working fine for a number of years. Yesterday, the control head showed hard over to starboard and couldn't be used. Rudder sensor passes the tests for resistance so appears to be ok. Control head seems fine in every other way, good compass headings, calibration procedures working etc. Disconnecting rudder sensor red and green and or switching them has no effect. It's on a seatalk network with sailing instruments and radar etc...Anything else to try? Can the Type 300 be repaired at this point? What computers could replace it without replacing everything else?

[Chuck - Raymarine - Moderator]

Welcome the Raymarine Forum cgold,

The reported symptom may occur if the autopilot detects excessive (>35 degrees) of rudder deflection when it is initially powered ON. The issue would typically be corrected by switching OFF the circuit supplying power to the autopilot, centering the rudder, and then switching ON the circuit supplying power to the autopilot. Should this not address the problem, then switch OFF the circuit supplying power to the autopilot, disconnect the rudder reference transducer, switch ON the circuit supplying power to the autopilot, and verify whether the autopilot control head is reporting rudder deflection.