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I’m trying to fix a Dremel that has a broken power adapter jack. I think the best way to repair it would be to solder the power adapter wires directly on the PCB of the Dremel.

There are still 2 wires soldered on the PCB, so I would solder the power adapter wires together with the PCB’s wires (see pictures).

The only part I don’t know is: which wires should I solder together? There is one red and one black on the power adapter, but both are red on the PCB.

Here is the PCB:

enter image description here

I would remove the black input block and just leave both red wires.

And here is the wire from the power adapter:

enter image description here

Better view:

enter image description here

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    \$\begingroup\$ Connect the black wire to the point on the PCB where the jack connected it. Do the same for the red wire. The color of the wires on the original PCB does not matter. \$\endgroup\$ Commented Jan 3, 2023 at 18:53
  • \$\begingroup\$ @user1850479 but the jack is connected to both points on the PCB no? I uploaded a second picture with a better view. Thank you \$\endgroup\$
    – Tommy B.
    Commented Jan 3, 2023 at 18:59
  • \$\begingroup\$ Or are you only talking about the wire soldered to the back prong of the black block? \$\endgroup\$
    – Tommy B.
    Commented Jan 3, 2023 at 19:01
  • \$\begingroup\$ I would look for a replacement jack socket first, but if you decide to solder the wires to the PCB, don't forget to put in some sort of pull relief, so that pulling the wire doesn't strain the solder joints and the PCB pads. \$\endgroup\$
    – ocrdu
    Commented Jan 3, 2023 at 19:07
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    \$\begingroup\$ Since when are Dremels pink??? \$\endgroup\$
    – Kyle B
    Commented Jan 3, 2023 at 23:37

1 Answer 1

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Looking at the first picture, I think that is a Barrel Jack. The polarity of it is the outer contact is the -ve polarity and the inner contact is the +ve polarity. It seems in your picture that the wire on the right is the -ve and the one on the left is the +ve.

But you need to check it well beforehand.

When it is confirmed, you can directly solder the Red wire from the adapter to the +ve connection and the Black wire to the -ve.

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  • \$\begingroup\$ If you plan to leave the existing wires in place, you could just cut off the bad jack and splice the wires to your new ones. No need to solder to the PCB. There probably isn't room for wire nuts inside that Dremel case so one option would be to just twist the wires together, add a dab of solder, and wrap with electrical tape. \$\endgroup\$
    – kolyur
    Commented Jan 3, 2023 at 19:21
  • \$\begingroup\$ It works and is now fully working again! Thanks everybody! \$\endgroup\$
    – Tommy B.
    Commented Jan 4, 2023 at 11:18

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