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Broken Polarity Dial/Knob/Switch on AC-DC adapter

Discussion in 'Troubleshooting and Repair' started by Newstar, Mar 11, 2011.

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  1. Newstar

    Newstar

    4
    0
    Mar 11, 2011
    My AC-DC Adapter broke down about 4 months ago. I recently tried to fix it but my minimal knowledge of electrical circuitry isn't helping. I may have lost a spring when it first broke down 4 months ago. But anyway, im posting the pictures of the parts, and the inside of the adapter.

    http://img846.imageshack.us/i/dsc00636a.jpg
    In this photo you can see the missing polarity knob switch (left)

    http://img713.imageshack.us/i/dsc00637p.jpg
    Removing the cover reveals this.

    http://img851.imageshack.us/i/dsc00638.jpg
    These are the parts that i have recovered. I may have lost some parts. In this photo you can see 2 metal parts on the left. I am not sure if there's supposed to be a separator of some sort to prevent them from touching each other. any ideas?
    oh and the spring you see on the green plastic switch is improvised. I lost the original spring

    http://img25.imageshack.us/i/dsc00639gs.jpg
    THis is the back end of the circuit board. Notice the Hole on the right side where the Knob/Switch lock would stay.

    I know how to put all the pieces back. But my problem is with the two metal parts. I dont know where they should be touching.. or whether or not those two metals should be separated by an insulator to prevent them from touching each other. Thanks GUys! :) :)
     
    Last edited: Mar 11, 2011
  2. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
    I cannot be sure but i would imagine those two metal tabs are used as links for switching polarity. If this is the case then they would indeed be seperated by some sort of insolation. It would be possible to wire up another switch (say a DPDT) to enable to reverse the polarity...?

    A simple search on google will show you how to achieve this :)
     
  3. Newstar

    Newstar

    4
    0
    Mar 11, 2011
    Thanks for your reply. Like I said, my knowledge of circuitry is very very minimal. I do now know what a DPDD is. But thanks for pointing out that they indeed need to be separated. I will try to think of something to fix it. Rewiring is not an option for me as i am not an experienced electrician. :) thanks a lot
     
  4. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
  5. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
    The link provided is for a motor but it will do the same job for your aplication :)
     
  6. Newstar

    Newstar

    4
    0
    Mar 11, 2011
    Thanks, like I said. my knowledge is minimal. I guess i should say i have zero electrical knowledge :) but i appreciate your input.
     
  7. Newstar

    Newstar

    4
    0
    Mar 11, 2011
    Okay, Thanks for the help!! Its working now! I was able to put everything back in.. And i did put a piece of rubber washer in between the two metal parts.. luckily it was the right polarity! :) thanks !!
     
  8. rob_croxford

    rob_croxford

    262
    0
    Aug 3, 2010
    haha good work!
     
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