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JCD 8898 zener diode ratings

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    JCD 8898 zener diode ratings

    I have a JCD 8898 has a faulty zener diode ,I'm looking for a replacement zener voltage rating.

    #2
    Re: JCD 8898 zener diode ratings

    Does the zener have any marking on it?

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      #3
      Re: JCD 8898 zener diode ratings

      Originally posted by keeney123 View Post
      Does the zener have any marking on it?
      It's got a greenish bluish line around it

      Comment


        #4
        Re: JCD 8898 zener diode ratings

        Originally posted by keeney123 View Post
        Does the zener have any marking on it?
        It's a glass zener diode with a single blue line

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          #5
          Re: JCD 8898 zener diode ratings

          The blue ring only states it is a zener diode, but does not give a value.
          I could not find a schematic, so you may need to trace out the circuit to try and figure out what the zener does in the circuit
          Last edited by R_J; 07-26-2022, 02:41 PM.

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            #6
            Re: JCD 8898 zener diode ratings

            Originally posted by mintostrich View Post
            It's a glass zener diode with a single blue line
            I also did not find a service manual or schematic for the unit. I did find a unit tear down from one that was in the US but, they did not mention the Zener diode. It was a 15-minute explanation and tear down and it was at about 11 minutes into the video where the tear down started.

            The below link is a more direct tear down and explanation of the parts which might help you.
            https://www.bing.com/videos/search?q...5D&FORM=VDRVRV

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              #7
              Re: JCD 8898 zener diode ratings

              It's a strange soldering station - super cheap at ~$30 and the SMPS power supply looks so small.
              MELF diode D5 looks like part of a capacitive dropper arrangement for the top MCU board power. It's just strange that isn't powered by the lower board SMPS and it seems to use a triac for the soldering iron heater (as well as the hot air), which is odd/ The heaters must be all mains powered?

              Without clear pictures or a schematic, there's no way to guess the zener's voltage or to figure out the power system.
              I would suspect the dropper capacitor failing low value before the zener.

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                #8
                Re: JCD 8898 zener diode ratings

                The zener diode there is at 5.1v, it goes to the XC6206P332MR (3.3v, 662K sot23), and it powers the MS51FB9AE - Nuvoton controller.
                Attached Files

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                  #9
                  Re: JCD 8898 zener diode ratings

                  Originally posted by lotas View Post
                  The zener diode there is at 5.1v, it goes to the XC6206P332MR (3.3v, 662K sot23), and it powers the MS51FB9AE - Nuvoton controller.
                  Leave it to Russia to come to our rescue! Thanks, Lotas

                  Comment


                    #10
                    Re: JCD 8898 zener diode ratings

                    Originally posted by lotas View Post
                    The zener diode there is at 5.1v, it goes to the XC6206P332MR (3.3v, 662K sot23), and it powers the MS51FB9AE - Nuvoton controller.
                    Thank you lotas

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