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    Q1 fell off

    IR Height Sensor
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    • simplesimson
      simplesimson last edited by simplesimson

      Hi,
      my Diode Q1 fell off. Maybe something hit it a while ago. Or it just got ratteled off over the years. How do i know which way to solder it back on? polarity I think polarity is important 😉 .. And if its broken, what is the correct spare part?

      Couldnt find the layout so I hope somebody can help me.

      Regards
      Simon

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      • jay_s_uk
        jay_s_uk last edited by

        might help us if you tell us what board you are talking about.
        also the revision if applicable

        Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF

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        • simplesimson
          simplesimson last edited by

          The board looks like this one from filafarm. Thats also where i got it about 2 years ago.
          I just tryed to meassure the voltage drop and had to see that the endcaps still are in the soldering on the board. Meaning only the middlepart of the diode break lose.
          So i need a replacement diode.

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          • jay_s_uk
            jay_s_uk last edited by

            The schematics can be found here https://github.com/dc42/OrmerodSensorBoard

            Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF

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            • dc42
              dc42 administrators last edited by

              The polarity does matter. There is a green square on the back of that part, offset from the centre. It should be oriented on the side towards the black capacitor, away from the board edge.

              Duet WiFi hardware designer and firmware engineer
              Please do not ask me for Duet support via PM or email, use the forum
              http://www.escher3d.com, https://miscsolutions.wordpress.com

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              • simplesimson
                simplesimson last edited by

                Thanks a lot for your help guys. I ordered it and am looking forward to repair it.

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                • simplesimson
                  simplesimson last edited by simplesimson

                  69f22445-b45b-43cc-a08d-0e7b2489d9d8-image.png
                  source: https://github.com/dc42/OrmerodSensorBoard/blob/master/SchematicAndPCB/Mini-differential-IR/V1.2/board.png
                  @dc42 the parts arrived. but i think i have to point the green square on the back as shown on the scematic or? so that its towards the corner of the pcb, away from the black capacitor, or?

                  Regards, Simon

                  EDIT: I tryed it as you described. I had to face green square to the outside for it to read

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