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source of flex cable

Discussion in 'Electronic Repair' started by Michael Kennedy, Nov 12, 2007.

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  1. I have a casio ex word dictionary that has a broken flex ribbon cable. Is
    there anywhere that I could possibly source a replacement. The connection on
    each end is the same, and I could live with something that will just work
    rather than the original cable. I think there are 28 pins on the end but it
    is rather difficult to count. The spacing is the same as if you lined 30
    gauge wire side by side. I had tried to solder #30 wire to the connections
    unsuccessfully. I thought I had it, the ohm meter said it was good, but I
    think when I moved it to assemble everything the weak solder joints broke.
     
  2. I also forgot to mention that the way it is broken it makes using conductive
    paint unfeasible.
     

  3. I looked at this thing again and it has 27 pins with 2 pins per mm.
     
  4. b

    b Guest

    I recently had to fix a portable dvd player which ahd intermittent
    laser supply. traced to a duff flex cable between pickup and pcb.My
    local parts supplier said NLA. So will have to try elsewhere. I
    suppose I'm luckier as i may be able to source one from a scrap cd-
    rom drive or similar. maybe you could look at this option....
    good luck.
    b.
     
  5. Eeyore

    Eeyore Guest

    That's not much help to non-americans. 'Gauge' i.e. AWG is a US only measure.
    The rest of the world uses mm.

    Can you measure the pitch properly ?

    Graham
     
  6. Eeyore

    Eeyore Guest

    That's no 'ribbon cable' I suspect. Do you mean a flexible pcb construction

    Graham
     
  7. I later measuered it and it appears to have 2 pins per mm and 27 pins.
     
  8. Yes I meant flexible pcb.
     
  9. lmcclaf

    lmcclaf Guest

    Can you specify the model number of your Casio? That might spark a
    light for someone that might have a non-working unit in their parts
    box.

    Cheers,
    Lawrence
     
  10. Arfa Daily

    Arfa Daily Guest

    If it's one of the flexiprints where the tracks terminate as 'fingers' which
    then insert into a connector, and it's gone near the end, just at one of the
    reinforcing strips, you can often remake the end by removing the reinforcing
    strip, and cutting the flexiprint back to just beyond the fracture, with a
    sharp scalpel. The plastic coating over the tracks can then be fairly easily
    removed using a blunt curved scalpel blade, to expose a new set of
    'fingers'. This 'new' end can then be inserted into the connector, and the
    reinforcing strip slipped back in behind it.

    They are made by Multicomp or Pro Power

    http://www.farnell.com/datasheets/100853.pdf

    and over here, Farnell keep them. You can cut down ones that are too wide
    with a sharp scalpel, so I guess you could use a 35 way. You could try
    www.farnell.com and have a look at their US site. Part number for a 35
    way 0.5mm pitch here, is 1455407

    Arfa
     
  11. Eeyore

    Eeyore Guest

    Right !

    That's VERY different. I'd think seriously about whether you need to do this.
    These flexible PCBs are custom made in every case. Your only option AFAICS is to
    replace it entirely with many very fine wires. Hey, or even just patch the
    problem conductors.

    Graham
     
  12. You are a lifesaver Arfa! You always help me when I've got a problem. What
    happened is it is partially broken in the middle where it flexes. One of the
    hinges is broken and thats why the flex broke. Is flexprint the correct name
    for this type of cable? I wonder if mouser or digi-key stocks these.

    Mike
     
  13. This belongs to my friend from Japan. She bought it in Japan years ago. I
    couldn't find the model number until now... It is a XD-R8100.
     
  14. James Sweet

    James Sweet Guest


    Conversion charts are readily available, it should be easy to work with
    either system.
     
  15. Eeyore

    Eeyore Guest

    AWG is a pain in the ass. Metric sizes can be directly used in calculations
    without the use of any 'tables'.

    Graham
     
  16. Can't you salvage a cable from an old flatbed scanner or printer and cut
    it down?
    No idea if the pins match but as suggested by another poster, if it's
    very small try an old dvd or cd drive for a cable and trim to suit.
    I found it's possible to shorten a cable and scrape the plastic off to
    expose the contacts again, expose a bit longer and then trim to size.

    Cheetah
     
  17. James Sweet

    James Sweet Guest


    Why's it a pain in the ass? A given AWG has a direct metric equivalent, I
    have no problem with either system. I prefer metric for everything, but I
    guess I just don't see the difficulty. All it takes is memorizing a handful
    of numbers, it's easier than the resistor color code.
     
  18. Eeyore

    Eeyore Guest

    An inaccurate equivalent.

    There is no NEED for ANY code when using metric measures. Would you like to have
    to look up values for voltage, current, resitance, inductance and capacitance in
    tables or charts too ?


    Graham
     
  19. Arfa Daily

    Arfa Daily Guest

    Nope. Readily available in our neck of the woods from Farnell, Graham.

    Arfa
     
  20. I'd suggest revisiting the 30 gauge wirewrap wire solution. That's
    got to be easier than soldering 50 connections that are less than
    1 mm apart!

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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    | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

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