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Help needed with old components

Discussion in 'General Electronics Discussion' started by johnzar, Jan 4, 2017.

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  1. johnzar

    johnzar

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    0
    Jan 4, 2017
    Afternoon and thanks for the acceptance.
    i am based in SA, and struggling to find components for an electronic circuit.
    on the components it only says
    J380 i think it must be 2SJ380 & K2931 2SK2391.....
    anybody with some advise or help please?
    JB
     
  2. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    Show us the circuit. I Googled J380 and found that it is a P channel powerful fet. Have you looked up the others?

    Why do you wish to find the components when you already have them?
     
  3. johnzar

    johnzar

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    0
    Jan 4, 2017
    Thanks for the reply, one of my electronic sewing machines has a PC board in the unit that these two components on that are blown
     
  4. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    The 2SK2931 is an n channel powerful fet.
    There is a reason why these fets failed, presumably they drive the motor. There would be no point in putting in a couple more fets to fail. I would look at the motor if that is what they drive.

    Why the secrecy?
     
  5. johnzar

    johnzar

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    Jan 4, 2017
    Sunstarr does not exist in SA anymore. i got the information from the supplier abroad. and yes they will not give me the schematic diagrams
     
  6. johnzar

    johnzar

    6
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    Jan 4, 2017
    these two components does drive a presure foot system that has a 3 ohm coil operating the foot
     
  7. johnzar

    johnzar

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    Jan 4, 2017
    faulty components.jpg
     
  8. johnzar

    johnzar

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    Jan 4, 2017
    do i understood correct, these FET,s are not very strong? as like i said they only drive a 3 ohm coil
     
  9. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    j380 P channel 100V 12A
    2SK2931 N channel 60V 45A
    What makes you think they have failed? They do not look to be mechanically damaged and have not been removed for testing.

    With a 12V supply (guess) they will pass 4A through a 3Ω coil, well within their ratings.
     
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