Need a little part ID help.

May 05, 2005 5 Replies
G

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
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S

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

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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G

Here is a link to some pictures.

formatting link
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
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J

I read in sci.electronics.design that Glenn Ashmore wrote (in ) about 'Need a little part ID help.', on Thu, 5 May 2005:

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?

Regards, John Woodgate, OOO - Own Opinions Only. There are two sides to every question, except 'What is a Moebius strip?' http://www.jmwa.demon.co.uk Also see http://www.isce.org.uk
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S

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

"it\'s the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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R

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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