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Rudder reference unit

Control unit does not receive the correct angle of rudder and showing reversed directions of rudder. is this a sign of my rudder reference gone bad? and has to be replaced? then what product as there is no more st6000plus available?

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  • John S. Feb 21, 2012

    Hello, was the unit just installed and always shows reversed direction on the angle indicator or was it operating properly before and just all of a sudden stopped working? Also, is the rudder angle indicator running on a standalone system meaning that the rudder reference AKA feedback is connected directly to the angle indicator or does it go with an autopilot also?

  • atlasaus
    atlasaus Feb 22, 2012

    Hi John, Thank you for your feedback.
    My system(ST6000+ Autopilot) was working well incl ridder direction which is shown on the bottom part of the head unit. One day while cruising in auto mode, all of sudden the rudder indicator(bargraph) went to port in full length but boat swang to stbd. Soon after situation managed by steering manually. Since then the rudder indicator showing opposite directions and bargraph indicates only 6-8 dgrees even when actual rudder angle was in full (30 deg.). Could it be a problem in course computer? ST6000+ Autopilot system is working with the course computer Type 100/300 which to be located yet. Is there anyway to reset the couse computer?

  • atlasaus
    atlasaus Feb 23, 2012

    Thank you John,
    I have fixed problem after viewing the page 151 of the manual you sent which gave me a hint that I fixed the reference in wrong position so that it produces opposite direction and travelled only short distance resulting to restricted angle of rudder even when actual rudder turned fully.

    Thank you again.



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Hi, the first thing I would do is check the wiring from the course computer to the feedback, on both ends and also check the rudder feedback mechanical link to the rudder.
It is possible that the problem is in the course computer but a problem with the feedback wiring or the feedback itself is much more likely. If the wiring looks ok and the mechanical connection looks ok, I would then check the feedback potentiometer to make sure it moves smoothly when the rudder moves. You can check it with an ohm meter. Depending on what it reads, you can then replaces the feedback or do further troubleshooting. The feedback is a just a 5k ohm potentiometer. Here are instruction on how to test a potentiometer.
95% of the time, problems like this are problems related to the feedback and not the course computer. I don't know if there is a reset for the computer, I would have to call the factory and ask, the manuals don't mention it. If it turns out that you do need a new feedback, I just so happen to have a new one in my shop.

Posted on Feb 22, 2012

Testimonial: "Thank you John, I have fixed problem after viewing the page 151 of the manual you sent which gave me a hint that I fixed the reference in wrong position so that it produces opposite direction and travelled only short distance resulting to restricted angle of rudder even when actual rudder turned fully. Thank you again. "

  • John S. Feb 22, 2012

    Page 151 of this service manual shows the exact directions for testing this systems feedback



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