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Encoder

Discussion in 'Electronic Design' started by [email protected], Apr 4, 2009.

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  1. Guest

    I ripped apart an HP printer and on the back of the carraige that the
    moved the print heads around was an encoder and a 400 LPI encoder
    strip. The encoder is labeled H9721P. I can not find a datasheet for
    it, but there are only 4 pins. I'm guessing one is power, another is
    ground, then two sensor outputs. I'm curious if the is any way to
    determine what pins are what?

    http://rowell.info/~richard/h9721P-front.jpg
    http://rowell.info/~richard/h9721P-back.jpg

    It looks like C2 connects pin 2 to pin 4 (if you count the pins from
    left to right as viewed on the "front" image)

    TIA!
     
  2. HEDS-9721

    -UP
     
  3. Nutz

    Nutz Guest


    By convention pin 1 often has a square pad. Is your pin 1 really pin 1?
     
  4. Guest

    Well, the capacitor that goes to what you think is pin 2 would suggest
    it's the power pin. The other side of the cap would be ground, now you
    can beep it out.
    Or just apply power to the board and measure it. Or find a
    conventional IC on the board and measure it.
    So many ways.
     
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