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Power plug repair question.

Discussion in 'Electronic Repair' started by super_dave_42, Dec 8, 2006.

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  1. I have a device that has a broken power jack. When I contacted the
    manufacturer for replacement parts they wouldn't sell me the connector
    directly. They also wanted to charge me $700 to fix it. I don't think
    so!!!

    Now, I have a jack and plug combination in my junk drawer that will fit
    into the space used by the original, but I don't know what my parts are
    rated in terms of maximum voltage. Can anyone tell me how much
    insulator I should have separating the positive and negative leads of
    my connector in order to safely handle the 19.5 volts, 7.7 amps that is
    output from my power transformer? Is there anything else I should
    consider when trying to find a cheaper replacement?

    Thanks,
    Dave

    p.s. We also just found a plug and jack that appear to be RCA video
    cable connections. They would fit as well, but would they handle power?
     
  2. Arfa Daily

    Arfa Daily Guest

    In this case, the voltage rating is neither here nor there. 19.5 volts is
    nothing, and a piece of plastic tape would be enough insulation to be proof
    against that sort of voltage. The rating of primary concern is the current
    handling capability. If the power supply is capable of providing 7.7 amps,
    then you've got to assume that whatever the equipment is ( you don't
    specify ) is going to be looking for at least 5 amps at a guess. This is a
    fairly significant current for a small connector, and it's contacts will
    need to be heavy and of good quality. Although RCA jacks are capable of
    carrying a fairly high current, at least the good ones are, the pin
    configuration with the exposed centre one, is not very good for hot
    connecting.

    All in all, unless you are able to find out the rating of the connector pair
    that you have to hand, I think that you will have to search the catalogues
    for a suitable ringer for the original. An insufficiently rated connector
    may well run hot, and damage not only itself, but also the printed circuit
    board, to say nothing of the intermittent operation it may give due to
    voltage drop across it.

    Arfa
     
  3. Arfa Daily

    Arfa Daily Guest

    Just an afterthought. How about cutting the plug off the PSU's output cable,
    then hard wiring the cable straight to the unit's PCB. Then, locate a
    suitably rated line connector, and break it into the cable. Many high
    current-demand ham radios are done this way.

    Arfa
     
  4. Jim Land

    Jim Land Guest

    Here you go:
    http://www.dcpowerjacks.net/
     
  5. What sort of device draws that much? Laptop computer?
     
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