Need a little part ID help.

G

Glenn Ashmore

Guest
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
 
On Thu, 5 May 2005 13:21:16 -0400, the renowned "Glenn Ashmore"
<gashmore@cox.net> wrote:

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?
Click to expand...
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
 
I read in sci.electronics.design that Glenn Ashmore <gashmore@cox.net>
wrote (in <9Csee.2059$sy6.962@lakeread04>) about 'Need a little part ID
help.', on Thu, 5 May 2005:
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?

Diodes. But if the toasted one were the same part as the untoasted one,
Click to expand...
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
 
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
Click to expand...
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
 
On Thu, 5 May 2005 15:08:55 -0400, the renowned "Glenn Ashmore"
<gashmore@cox.net> wrote:

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

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.
Click to expand...
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
 
On Thu, 05 May 2005 19:56:49 -0400, Spehro Pefhany wrote:
On Thu, 5 May 2005 15:08:55 -0400, the renowned "Glenn Ashmore"
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?

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.

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.

I've seen these diodes, and from the picture, I'd agree with Spehro - that
Click to expand...
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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