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Need a little part ID help.

Discussion in 'Electronic Design' started by Glenn Ashmore, May 5, 2005.

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  1. I am trying to repair a circuit board for a solenoid valve manifold. It has
    8 24V solenoids (1.3K ohm coils) on the manifold and a circuit board
    distributes the signals from a 26 pin connector. One common connected to
    the negative side of all the solenoids loops around the board. The
    components in question connect the ends of the loop to the common connector
    pin. They have axial leads with a spherical body about 1/8" in diameter.
    One of these components is toast. The good one is light grey ceramic
    looking material with one end painted red. There are no other markings.
    The red end of the good one goes to the connector. The red (now dark Grey)
    end of the toasted one goes towards the solenoids.

    Anyone have a suggestion as to what they might be?

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  2. Hi, Glenn:-

    Sounds like they could be ceramic diodes, but the circuit doesn't make
    a lot of sense. How old is this device? Where was it made? Can you
    post a link to a photo closeup of the device and the board?


    Best regards,
    Spehro Pefhany
     
  3. I read in sci.electronics.design that Glenn Ashmore <>
    Diodes. But if the toasted one were the same part as the untoasted one,
    it would be connected the wrong way round. So maybe it's a zener.
    However, I don't know for sure that zeners ever came in that package.

    Is there any marking on the untoasted one?
     
  4. Here is a link to some pictures.
    http://client.webshots.com/photo/339027970/339027970jhNVND
    Community Webshots is the quickest way I have found to post pictures without
    tackying up the usnet. There are 3 pictures. Click Next & Prev to se the
    others.

    --
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at: http://www.rutuonline.com
    Shameless Commercial Division: http://www.spade-anchor-us.com
     
  5. The only parts I've seen in that package are rectifier diodes (maybe
    1A or 1.5A). That was a long time ago. As JW said, they could be
    zeners but I've never seen them offered in that package.

    If they are diodes, they will be very rugged and difficult to kill-
    capable of unsoldering themselves and surviving.


    Best regards,
    Spehro Pefhany
     
  6. Rich Grise

    Rich Grise Guest

    I've seen these diodes, and from the picture, I'd agree with Spehro - that
    the one covered with soot probably isn't blown - it's just covered with
    soot. Find out what _really_ burned up and discolored the package, and fix
    _that_.

    Have you ohmed it out?

    Thanks,
    Rich
     
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