I have a TDM40B, 4-port fxs card. Each port seems to have it's own little board on the fxs card. Each little board is not sodered in, but rather "hangs" (I have a vertical case for the server) on what I would call jumper pins (sorry, I'm not a profession geek, just a wannabe). One of my little boards, over time, slides off those jumper pins. I just noticed it this morning. I had to power down, seat it, and power up again. That's a pain. We did, though, have an earthquake this morning. That may have shaken things loose a bit. But, it wasn't much to speak of (long, but not strong). Has anyone else experienced this problem? What could I do to solve it (seat the little card a little more permanently)? Thanks ahead of time. -Greg -- Mutt 1.4.1i on Slackware 9.1 Linux Curridabat, San Jose, Costa Rica http://www.greg-and-sue.com/screenshot.jpg Yahoo Instant Messenger ID: gregkedro
Usually the cards seat pretty well. Do you have a green or blue TDM40B card? Mark On Wed, 4 Feb 2004, Greg Kedrovsky wrote:> I have a TDM40B, 4-port fxs card. Each port seems to have it's own > little board on the fxs card. Each little board is not sodered in, but > rather "hangs" (I have a vertical case for the server) on what I would > call jumper pins (sorry, I'm not a profession geek, just a wannabe). One > of my little boards, over time, slides off those jumper pins. I just > noticed it this morning. I had to power down, seat it, and power up > again. That's a pain. > > We did, though, have an earthquake this morning. That may have shaken > things loose a bit. But, it wasn't much to speak of (long, but not > strong). > > Has anyone else experienced this problem? What could I do to solve it > (seat the little card a little more permanently)? > > Thanks ahead of time. > > -Greg > > -- > Mutt 1.4.1i on Slackware 9.1 Linux > Curridabat, San Jose, Costa Rica > http://www.greg-and-sue.com/screenshot.jpg > Yahoo Instant Messenger ID: gregkedro > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users >
On Wed, 4 Feb 2004, Greg Kedrovsky wrote:> Has anyone else experienced this problem? What could I do to solve it > (seat the little card a little more permanently)?Automotive parts places sell products like lok-tite (a thread locker compound for mechanical fasteners). A drop or two of that, placed over the seam in the connector (after it's fully seated!) would probably hold it in place. This is the same kind of stuff you see on the screws that hold PCBs in their place in nearly everything. It seems to do well keeping those from rattling loose, so it would probably work for your card too. Greg
> Has anyone else experienced this problem? What could I do to solve it > (seat the little card a little more permanently)?Haven't experienced it but I would think that a small bead of silicone sealant would hold things in place. As the stuff cures it will release acetic acid but so long as you're not forcing the goop into the connectors (rather just around it) you should be fine. They do make RTV silicone sealant that does not release this acid as it cures; look for "Neutral" RTV sealant but as I have said, I've *never* run into problems with the normal stuff and holding down electronics so long as you're not going out of your way to get it into the connections. Regards, Andrew
On Wed, Feb 04, 2004 at 08:42:04AM -0600, Mark Spencer wrote:> Usually the cards seat pretty well. Do you have a green or blue > TDM40B card?Blue. -- Mutt 1.4.1i on Slackware 9.1 Linux Curridabat, San Jose, Costa Rica http://www.greg-and-sue.com/screenshot.jpg Yahoo Instant Messenger ID: gregkedro
> I have a TDM40B, 4-port fxs card. Each port seems to have > it's own little board on the fxs card. Each little board is > not sodered in, but rather "hangs" (I have a vertical case > for the server) on what I would call jumper pins (sorry, I'm > not a profession geek, just a wannabe). One of my little > boards, over time, slides off those jumper pins. I just > noticed it this morning. I had to power down, seat it, and > power up again. That's a pain. > > We did, though, have an earthquake this morning. That may > have shaken things loose a bit. But, it wasn't much to speak > of (long, but not strong). > > Has anyone else experienced this problem? What could I do to > solve it (seat the little card a little more permanently)? >I haven't looked at an FXS card recently... But when we use to build computers for shipping over seas the IDE card would unseat from the VESA Local Bus during shipping... (God I am probably dating myself with that one.) We would use "zip ties" (flexible plastic ratchet type of fastener) to hold the cards in place. Plastic == non-conductive and holds like a son of a gun. Not sure if this would work with the FXS card, but just throwing out an alternative to adhesives that might break down due to heat or other environmental issues. We used hot glue for a time, but the zip ties just worked much better. Tom Walsh Network Administrator http://www.ala.net/
Greg Kedrovsky wrote:> I have a TDM40B, 4-port fxs card. Each port seems to have it's own > little board on the fxs card. Each little board is not sodered in, but > rather "hangs" (I have a vertical case for the server) on what I would > call jumper pins (sorry, I'm not a profession geek, just a wannabe). One > of my little boards, over time, slides off those jumper pins. I just > noticed it this morning. I had to power down, seat it, and power up > again. That's a pain. > > We did, though, have an earthquake this morning. That may have shaken > things loose a bit. But, it wasn't much to speak of (long, but not > strong). > > Has anyone else experienced this problem? What could I do to solve it > (seat the little card a little more permanently)? > > Thanks ahead of time. > > -Greg >There are three issues here, relating to the other posts on this topic. Don't use loktite. Loktite is what is called an anerobic adhesive. Specifically, it is catalyzed by contact with metal in the absence of oxygen. As such, it will only cure (in the absence of some other chemical activator) only down inside the pin sockets, holding them together. The rest will stay uncured and spread all over other stuff. This may essentially make them a single use contact. The silicone is a good bet. The acid referred to is the acetic acid (i.e., vinegar) released when the monomers in the RTV goo cross react to form the silicone. Once the cure is complete, there is no acid production and what was produced diffuses away. Mild acids are not terribly corrosive to most metals, and not at all corrosive to gold. The types of RTV that don't produce acid may actually produce alkali (ammonia), which is far more corrosive, but also diffuses away readily. Nevertheless, I would stick to the stuff that smells like vinegar. Finally, I have found that the best approach is the simplest, when it works. If you can get one of those nylon tie-wraps around the daughter card in such a way as to hold it in place, this is the best - and most reversible approach. Sometimes, there are appropriate holes in the motherboard, othertimes the ty-wrap can be snaked around under the connector - however, don't run it under any other type of component. I have even drilled holes in 2-layer circuit boards, but I would not advise this unless you really, really, really know what you are doing. Finally, if the female side of pin sockets are loose enough to let the dayghter cards fall out, they may also be the source of noisy, intermittent connections. Sockets of allmost all kinds are notorious for this kind of thing. I can't tell you how many times I have repaired a flakey circuit board by removing the sockets and soldering in all the (formerly) socketed chips. The square pin spring contacts in those connectors are only designed for a few insertion/removal cycles. If that is the case, you should get a good repair tech. to replace them. Good luck and hang in there. Stephen R. Besch
I have used hot glue for many years with no problems. Decent adhesion, but can be picked off if ness. I showed this to a systems integrator that had problems with shipping PC's upside down and boards would become unseated. He used this on thousands of systems and the problem was eliminated. -----Original Message----- From: Stephen R. Besch [mailto:sbesch@acsu.buffalo.edu] Sent: Wednesday, February 04, 2004 10:14 AM To: asterisk-users@lists.digium.com Subject: [Asterisk-Users] Re: Boards falling out... Greg Kedrovsky wrote:> I have a TDM40B, 4-port fxs card. Each port seems to have it's own > little board on the fxs card. Each little board is not sodered in, but > rather "hangs" (I have a vertical case for the server) on what I would > call jumper pins (sorry, I'm not a profession geek, just a wannabe). One > of my little boards, over time, slides off those jumper pins. I just > noticed it this morning. I had to power down, seat it, and power up > again. That's a pain. > > We did, though, have an earthquake this morning. That may have shaken > things loose a bit. But, it wasn't much to speak of (long, but not > strong). > > Has anyone else experienced this problem? What could I do to solve it > (seat the little card a little more permanently)? > > Thanks ahead of time. > > -Greg >There are three issues here, relating to the other posts on this topic. Don't use loktite. Loktite is what is called an anerobic adhesive. Specifically, it is catalyzed by contact with metal in the absence of oxygen. As such, it will only cure (in the absence of some other chemical activator) only down inside the pin sockets, holding them together. The rest will stay uncured and spread all over other stuff. This may essentially make them a single use contact. The silicone is a good bet. The acid referred to is the acetic acid (i.e., vinegar) released when the monomers in the RTV goo cross react to form the silicone. Once the cure is complete, there is no acid production and what was produced diffuses away. Mild acids are not terribly corrosive to most metals, and not at all corrosive to gold. The types of RTV that don't produce acid may actually produce alkali (ammonia), which is far more corrosive, but also diffuses away readily. Nevertheless, I would stick to the stuff that smells like vinegar. Finally, I have found that the best approach is the simplest, when it works. If you can get one of those nylon tie-wraps around the daughter card in such a way as to hold it in place, this is the best - and most reversible approach. Sometimes, there are appropriate holes in the motherboard, othertimes the ty-wrap can be snaked around under the connector - however, don't run it under any other type of component. I have even drilled holes in 2-layer circuit boards, but I would not advise this unless you really, really, really know what you are doing. Finally, if the female side of pin sockets are loose enough to let the dayghter cards fall out, they may also be the source of noisy, intermittent connections. Sockets of allmost all kinds are notorious for this kind of thing. I can't tell you how many times I have repaired a flakey circuit board by removing the sockets and soldering in all the (formerly) socketed chips. The square pin spring contacts in those connectors are only designed for a few insertion/removal cycles. If that is the case, you should get a good repair tech. to replace them. Good luck and hang in there. Stephen R. Besch _______________________________________________ Asterisk-Users mailing list Asterisk-Users@lists.digium.com http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
> Good luck and hang in there.No pun intended, right? :-) Regards, Andrew
Hi. Low Temp Hot glue is what I use on my robots. Stay away from silicone (conductive) and rtv (peels traces off cheap pcb's) -Ejay> -----Original Message----- > From: asterisk-users-admin@lists.digium.com > [mailto:asterisk-users-admin@lists.digium.com] On BehalfOf> Greg Kedrovsky > Sent: Wednesday, February 04, 2004 8:18 AM > To: asterisk-user > Subject: [Asterisk-Users] Boards falling out... > > I have a TDM40B, 4-port fxs card. Each port seems to haveit's own> little board on the fxs card. Each little board is notsodered in, but> rather "hangs" (I have a vertical case for the server) onwhat I would> call jumper pins (sorry, I'm not a profession geek, just a> wannabe). One > of my little boards, over time, slides off those jumperpins. I just> noticed it this morning. I had to power down, seat it, andpower up> again. That's a pain. > > We did, though, have an earthquake this morning. That mayhave shaken> things loose a bit. But, it wasn't much to speak of (long,but not> strong). > > Has anyone else experienced this problem? What could I doto solve it> (seat the little card a little more permanently)? > > Thanks ahead of time. > > -Greg > > -- > Mutt 1.4.1i on Slackware 9.1 Linux > Curridabat, San Jose, Costa Rica > http://www.greg-and-sue.com/screenshot.jpg > Yahoo Instant Messenger ID: gregkedro > _______________________________________________ > Asterisk-Users mailing list > Asterisk-Users@lists.digium.com > http://lists.digium.com/mailman/listinfo/asterisk-users > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users