Einhell Pressito air compressor not working on mains voltage

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  • spleenharvester
    Badcaps Veteran
    • Mar 2010
    • 902
    • UK
    #1

    Einhell Pressito air compressor not working on mains voltage

    Hi all,

    I have this air compressor by Einhell, history unknown. It has two modes - 18V battery and 240V AC. On battery everything works fine. On AC it switches on, but makes a quiet repetitive buzzing noise, and the second you start either of the air pumps it completely dies most of the time. On occasion it will work without fault.

    Only thing remarkable on physical inspection is that the filter cap on the PSU board has a scorched positive lead. It is 150uF, 400V, 105*C. The cap is an awful Asia'X brand. Is it possible this filter cap is the source of the fault, or is the scorched lead just a generic sign that a lot of current has been pulled through it at some point?

    Thank you
    2 Photos
    Last edited by spleenharvester; 01-18-2024, 09:40 AM.
    Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD
    Tags: None
    • spleenharvester
      Badcaps Veteran
      • Mar 2010
      • 902
      • UK
      #2
      Also does anyone know what these plastic blades are called/where I can find a replacement? I snapped it by accident and cannot for the life of me figure out where to get another. Pump works fine without so I'm guessing they just serve to cool the motor down? I guess I might need to 3D print one.

      (Edit just 3D printed one)
      Attached Files
      Last edited by spleenharvester; 01-18-2024, 11:15 AM.
      Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

        Comment

        • CapLeaker
          Leaking Member
          • Dec 2014
          • 8146
          • Canada
          #3
          Does the motor start no problem as long as everything is warm? As colder it is it harder or even impossible to start? As for the main filter cap, check it for cracks in the solder joint.
          the fan is to cool the motor for cooling. Either fix or replace it.

            Comment

            • spleenharvester
              Badcaps Veteran
              • Mar 2010
              • 902
              • UK
              #4
              Originally posted by CapLeaker
              Does the motor start no problem as long as everything is warm? As colder it is it harder or even impossible to start? As for the main filter cap, check it for cracks in the solder joint.
              the fan is to cool the motor for cooling. Either fix or replace it.
              It doesn't seem to be temperature related, it's totally random whether it will run or not. When it doesn't run everything goes off, no lights.

              I think you are right about cracks in the joint, I desoldered the filter cap for replacement and the scorched pad delaminated immediately. Just waiting for the replacement cap to get here to do a bridging repair.
              Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

                Comment

                • spleenharvester
                  Badcaps Veteran
                  • Mar 2010
                  • 902
                  • UK
                  #5
                  Update, new filter cap and a bridging repair has fixed the problem. Thanks!

                  Click image for larger version Name: PXL_20240122_142439561.jpg Views: 186 Size: 399.0 KB ID: 3202296
                  Dell E7450 | i5-5300U | 16GB DDR3 | 256GB SSD

                    Comment

                    • sam_sam_sam
                      Badcaps Legend
                      • Jul 2011
                      • 6039
                      • USA
                      #6
                      Good job repairing it

                      I would clean the flux off of the board if I were doing this job the soldering joint repair looks pretty good

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