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Crimp connectors as IDC ?

Discussion in 'Electronic Repair' started by N Cook, Sep 11, 2007.

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  1. N Cook

    N Cook Guest

    Is it acceptable practice?
    Kustom KPM6160A mixer amp from 1997 with intermittant crackles and sometimes
    loss of sound, waggling the interboard ribbon leads produces these symptoms.

    The .156in spacing Harwin/Molex/ Amp/Tyco connectors for power are fine , 2
    sets of crimp pairs , one crimped around the conductors and one crimped
    around the sleeving.
    But the .1 ins spacing ones have single crimp pairs which are crimped around
    unstripped insulation and relying on the returned ends piercing through the
    insulation into the conductors.
     
  2. Ron(UK)

    Ron(UK) Guest

    The fact that they are giving trouble answers your question. Is there
    any satisfactory way of hard wiring it?

    Ron(UK)
     
  3. N Cook

    N Cook Guest

    I pulled the wires out, very easily and cleanly, cut the ends off , solder
    blobs on the pins and the recut wires and soldered together.
    Some "hot-melt string" melted over the joins for some mechanical bonding to
    the shroud.
    I looked closer to the crimps and the returned ends are curled over where
    they pierced the insulation.
    The interconnect in the mixer section , .1 ins spacing was properly crimped,
    so just the ones between mixer and ps and ps to amp were bodged.
     
  4. Ron(UK)

    Ron(UK) Guest

    I have very little faith in idc`s anyway, I have one of those Neutrik
    stageboxes which is all idc. Great idea, but it`s a waste of space, I
    eventually had to solder all the connections to keep it reliable.

    Ron(UK)
     
  5. That's how it's done. :) Look at all the computer IDE, floppy, SCSI
    cables. Or am I misunderstanding the question?

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     
  6. Ron(UK)

    Ron(UK) Guest

    As I understood him, he meant that the _insulation grip_ part of the
    connector had been forced into and through the insulating outer to
    hopefully make contact with the conductor within. In other words the
    'tangs' which crimp the connector to the wire also serve as the contact
    points. I've seen this quite a few times in examples of 'Chinese Junk'
    Not good practise IMO
    Ron(UK)
     
  7. N Cook

    N Cook Guest

    Instead of 2 sets of crimp points - one for the sleeving and one for the
    conductors.
    These ones had one pair and instead of stripping back the insulation and
    crimping to the wires, they had not stripped back and crimped hoping the
    returned ends of the crimp tangs would make contact with the strands.

    Often seen with those small crocodile connector, jump leads, that you get in
    packs of 10 , 2 of each colour. I long since learnt with them is, when you
    buy them, the first thing to do is you pull back each croc and solder the
    wire to the croc.
     
  8. OK, in that case I agree. :) Proper IDC connectors are very carefully
    designed. You don't get realiable connections by accident!

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
    +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

    Important: Anything sent to the email address in the message header above is
    ignored unless my full name AND either lasers or electronics is included in the
    subject line. Or, you can contact me via the Feedback Form in the FAQs.
     

  9. I bought a 100 genuine Mueller Electric type 60 alligator clips in
    the early '70s, and still haven't used half of them. I still have some
    ne type 62 insulators in red and black, too.


    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
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