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Boss OD-2. LED issues.

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  • Boss OD-2. LED issues.

    Embarrassed to admit this pedal is beating me atm
    Pedal ops ok.
    Led only works on battery. Nothing on boss pwr adapter. If I provide an earth to the led at r53 it glows bright. If I Bypass D1 and r2 (ie pin 5 to ground) led bright. (Replaced both)
    At a loss. I’m sure the issue is staring me in the face!
    Cheers Gav
    Cheers,
    Gavin
    ------------------
    Tone, its in your fingers mate!!

  • #2
    schematic?
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      Do you have something plugged into the input jack? The ground is completed by the jack shorting ring to sleeve when a plug is inserted.

      Schematic here:
      https://www.hobby-hour.com/electroni...-schematic.gif
      "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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      • #4
        Click image for larger version

Name:	od2-turbo-overdrive-schematic.gif
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        Cheers,
        Gavin
        ------------------
        Tone, its in your fingers mate!!

        Comment


        • #5
          Yep,there's a jack in the input. all its grounds checked ok The pedal works fine. its just the LED. LED works fine on Battery.
          Cheers,
          Gavin
          ------------------
          Tone, its in your fingers mate!!

          Comment


          • #6
            D1 and R2 are good?
            "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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            • #7
              Removed and Tested good. substituted both no diff.
              Cheers,
              Gavin
              ------------------
              Tone, its in your fingers mate!!

              Comment


              • #8
                Some boss pedals the led won't work on adapter if it's not the specified boss adapter. Does it call for the PSA or ???
                Originally posted by Enzo
                I have a sign in my shop that says, "Never think up reasons not to check something."


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                • #9
                  Here's the info: https://music-electronics-forum.com/...l=1#post512364
                  Originally posted by Enzo
                  I have a sign in my shop that says, "Never think up reasons not to check something."


                  Comment


                  • #10
                    G1,
                    You sir are a legend.
                    Thanks
                    I thought I was going mad. Certainly done my duds on this job, but have learnt something, so happy!
                    Cheers mate
                    Gav
                    Cheers,
                    Gavin
                    ------------------
                    Tone, its in your fingers mate!!

                    Comment


                    • #11
                      Glad to be of help. Fortunately, it was one we had just discussed recently, so I could still recall it.
                      Originally posted by Enzo
                      I have a sign in my shop that says, "Never think up reasons not to check something."


                      Comment

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