Any info on Bendix-King autopilot servo connections/functions?

Discussion in 'Electronic Design' started by Peter, May 18, 2004.

  1. Peter

    Peter Guest

    Hi,

    I am trying to find out the signals used by the KFC225 roll servo. The
    generic part number is KS0271C. Most of the pins are pretty obvious
    from their names. I have a schematic showing the connections between
    the autopilot and the servo itself, but for example I don't fully
    understand the functions of the "input" and "input reference" inputs -
    presumably it is some kind of a differential input, but I don't know
    what the specs on the voltage swings is. Also there are some error
    signals which go back to the computer.

    The really puzzling thing is that during certain times at the power-up
    self test, and at all times afterwards, there is a 1.4kHz sinewave of
    about 100mV P-P superimposed onto the DC voltage on the "input" signal
    (the "reference" signal is clean though). I don't know if this is a
    fault of the computer, or whether it is intentional.

    Would anyone familiar with the basic principles of autopilots be able
    to shine any light on this?

    I would like to know this because I am trying to repair one whose
    power amp has burnt out, to keep as a standby.


    Peter.
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    Peter, May 18, 2004
    #1

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