Electronics Forum: 273 (Page 1 of 2)

Re: tombstoning after wave?

Electronics Forum | Wed Dec 13 06:08:48 EST 2000 | jackofalltrades

We have seen this type of problem. After eliminating possibility after possibility we corrected the problem by throwing out the glue and starting fresh. It was not expired, just bad for whatever reason, we could not asertain what went wrong with it.

TCR %PPM

Electronics Forum | Thu Aug 16 19:54:12 EDT 2001 | davef

Understanding Temperature Coefficient of Resistance * http://www.riedon.com/temp_coeff_nt.htm * http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html * http://www.rit.edu/~674www/programs/phys273/temp_coeff.html

Re: tombstoning after wave?

Electronics Forum | Mon Dec 11 20:56:29 EST 2000 | Dave F

I'm with ya John. I'm afraid I'm in brain lock on picturing the situation, mostly because of my bias against waving second side MELF. I know people do it, but we've never had good luck. It would be good if we could have a clear process flow to hel

Re: tombstoning after wave?

Electronics Forum | Tue Dec 12 08:44:27 EST 2000 | Wolfgang Busko

Another theory just developed in this very moment is that the glue did for what reason ever become "liquid" to a certain degree allowing gravity to do what gravity normally does but only to a certain point where this bubble-gum-like state stopped ( w

Re: SMT Jumpers (links)

Electronics Forum | Mon May 08 20:45:09 EDT 2000 | Dave F

Peter: How about a SMT test point? E-Mark (0603 0805) 273 Canal St Suite 414 shelton CT 06484 800.831.5383 www.e-markinc.com OXLEY (round test point gold color but difficult to pickup) Component Corp (loop ~ size of 1206 silver color works fine)

ESS Test Equipment

Electronics Forum | Thu Jul 18 11:59:47 EDT 2013 | justinlevine24

Hi Eric, What ESS test equipment are you looking into specifically? This will allow us to help answer your questions better. Best Regards, Justin Levine OEM Company Global Sales Division [Office] 408-675-5613 [Cell] 480-273-6068 email: Ju

Pick N Place Machine 550mm length PCB

Electronics Forum | Thu Jul 18 17:51:13 EDT 2013 | justinlevine24

Yes, I have a few in our system. Send me a message with your needed specs and I can match it up for you. Justin Levine OEM Company [Cell] 480-273-6068 email: Justin.l@oemcompany.com www.oemcompany.com

Re: tombstoning after wave?

Electronics Forum | Fri Dec 08 18:37:01 EST 2000 | Dave F

Asymetry in heating or mechanical forces are the primary reasons for tombstoning regardless of the reflow method. [There's beaucoup of background in the fine SMTnet Archive on reflow tomstoning.] Your situation is curious, but at least you know why

Help!!

Electronics Forum | Sat Nov 05 01:22:23 EST 2005 | koeka

All, We are having insufficient hole fill only at DIMM connector area(120 pin/row total two or 4 rows at that area) when we switch to lead free (SAC and Sn/Cu). The finish we using is immersion silver. Preheat on top side ~98-118oC. Rosin flux type.

tombstoning after wave?

Electronics Forum | Fri Dec 08 11:08:03 EST 2000 | Antonio

Ok fellas, tell me how you'd fix this! I'm having melf connectors that are tombstoning in the wave, NOT the reflow, the wave. I've never seen this before. All other parameters are the same...solder, preheats, placements, the board, building humidi

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