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    Duet Differential height sensor LED doesn't light

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    IR Height Sensor
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    • KB87undefined
      KB87
      last edited by Phaedrux

      Hi,

      After some help. I have just fitted the Differential height sensor to my Anet A8 Printer. The mother board has been upgraded to a MKS Gen v1.4. I have connected the sensor up as per the instruction in here: https://miscsolutions.wordpress.com/mini-height-sensor-board/

      The sensor works fine and detects the bed, but the LED light does not work at all. Not when the printer powers up or when the the bed is detected. I know it does not effect the function of the sensor, but it is handy to know when the senor is detecting.

      I purchased the sensor from e3d & they have told me to ask for help on here to see if it is a simple fault before they go down the warranty route.

      Thanks, Kevin.

      1 Reply Last reply Reply Quote 0
      • dc42undefined
        dc42 administrators
        last edited by

        I'm sorry that your IR sensor appears to be faulty. When testing IR sensors prior to release, I have occasionally found one with an LED that does not light. The cause has always been one of the following:

        • One end of the LED not soldered properly to the PCB
        • The plastic top of the LED has been sheared off
        • (very occasionally) the LED is missing completely

        The only other likely cause is a missing or improperly soldered 330 ohm series resistor, but I have never encountered this.

        If you can see that one end of the LED is not properly soldered, and you have a fine-tipped soldering iron, then you could attempt a repair yourself (and if you fail, we will still honour the warranty). Otherwise, please ask for a warranty replacement, which I hereby approve.

        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

        KB87undefined 1 Reply Last reply Reply Quote 0
        • KB87undefined
          KB87 @dc42
          last edited by

          @dc42 Looks like the plastic top of the LED is damaged. alt text The image is a bit blurry but you can see part of the white missing at the top.

          E3D are saying the unit will need to be returned with recorded postage so you can review the board. Is this still the case? With the current situation with COVID-19 I dont know when I will be able to get to a post office to send it back.

          dc42undefined 1 Reply Last reply Reply Quote 0
          • dc42undefined
            dc42 administrators @KB87
            last edited by

            @KB87 said in Duet Differential height sensor LED doesn't light:

            @dc42 Looks like the plastic top of the LED is damaged. alt text The image is a bit blurry but you can see part of the white missing at the top.

            E3D are saying the unit will need to be returned with recorded postage so you can review the board. Is this still the case? With the current situation with COVID-19 I dont know when I will be able to get to a post office to send it back.

            Normally we ask for faulty boards to be returned, but I will make an exception in this case. So you don't need to return it.

            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

            KB87undefined 1 Reply Last reply Reply Quote 0
            • KB87undefined
              KB87 @dc42
              last edited by

              @dc42 Thank you very much for your help on this issue 🙂

              1 Reply Last reply Reply Quote 0
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