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Any way to check D1889 & B1340 transistors, apart from measuring resistance?

Discussion in 'Troubleshooting and Repair' started by Bross, Nov 22, 2015.

  1. Bross

    Bross

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    0
    Nov 17, 2015
    Hi! I've got a problem in my turntable and a user suggested that these NPN/PNP transistors (D1889 and B1340) are broken. First thing I thought was "I buy the 6 ones and I'll try with them", but I see that they're not that easy to find them in my country or through Internet (and when I do, they are expensive).

    I've checked the resistance with a multimeter and I have similar results between each of the three pairs in all of them, so I can't see any short or something. But this doesn't mean that they must be ok, right? What do you recommend? Or maybe there are other more common models that fit in my turntable...
     
  2. Martaine2005

    Martaine2005

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    617
    May 12, 2015
  3. duke37

    duke37

    5,201
    713
    Jan 9, 2011
    What are the data for the transistors, they are probably not special and some equivalents could be found.
    Many meters have a little socket with which to connect transistors to measure their gain. If they have any gain at all, they are possibly OK.
     
  4. Bross

    Bross

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    0
    Nov 17, 2015
    Thanks for your answers! I didn't know about that web that returns equivalents and the gain measuring (my Caltek CM3900 has it, yes; but I think they are not suitable for my darlingtons). I checked the pdf with the D1889 diagram on that web and found a diode inside. One of my D1889 let pass current in both ways, yeah! And found it on alliexpress.com at a reasonable price, hell yeah! Next step was easier than I thought...

    Cheers!
     
  5. Deluminati

    Deluminati

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    Feb 15, 2019
    If you have a Stanton str8 or st150, the 7824 voltage regulators might be the problem, i had a problem before and seemed like should be the transistors but was in fact the positive 24 reg
     
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