Electronics Forum: pass (Page 16 of 142)

Wrinkle finished on solder joint

Electronics Forum | Thu Oct 25 08:19:53 EDT 2001 | Dave G

Sounds like somthing disturbed the solder joint while it was @ liquidus. Could the part/leads be moving on the 2cnd pass ?

Second Pass In Wavesolder

Electronics Forum | Thu Jan 03 07:38:01 EST 2002 | davef

Scott is correct. Expanding a bit, the SMTnet Library has a "Terms & Definitions" listing in the "Standards & Terms" section.

Second Pass In Wavesolder

Electronics Forum | Thu Jan 03 07:49:20 EST 2002 | hany_khoga

Thanks Scott: The Assembley is Mixid ( reflow then wavesoldered). It is One curcuit. Is the Tg averagely known for FR4 PCB assemblies? Hany

Second Pass In Wavesolder

Electronics Forum | Thu Jan 03 08:44:08 EST 2002 | davef

The Tg of the resin commonly used in FR-4 is 140�C. Consider checking with your supplier to better understand the specific materials used in constructing your board.

White Flux Stains - stubborn stains

Electronics Forum | Mon Jan 28 07:48:18 EST 2002 | cnotebaert

Did you perform a cleanliness test on the boards? did it pass? if yes whats the issue? visual attributes like this will not effect form fit or function of the device. Finding this under 30X, wow, why 30X????

Hand Lotions

Electronics Forum | Mon Mar 04 18:53:42 EST 2002 | babe

I have documentation from many companies on a hand lotion that passes all of the critical tests required in handling of PCB's. If you wish I could copy or have the manufacturer send this information your way. Steve

how cp642 identify the melf1.3 & 1.3 nozzle

Electronics Forum | Thu Aug 22 02:18:09 EDT 2002 | mjabure

Specify the nozzle size as 1.4 in both the nozzle allocation table and the PD, the nozzles will still pass center test as the size variation is still within tolerence.

CSP and underfill

Electronics Forum | Fri Aug 23 18:51:00 EDT 2002 | edahi

weve done a few evaluations for the no-flow underfill and for the reliability I think it has already passed MRT L3 @ 220C reflow. What is it specifically you're interested about the flow u/fill??

SMTnet E-mail

Electronics Forum | Tue Sep 17 07:08:51 EDT 2002 | cyber_wolf

The only place I ever used my SMTNET E-mail is through a couple of E-mails I sent to people that use this site. I sincerely hope that the used equipment guys are not passing out our E-mail addresses. Thanks for the response.

Solder Contamination

Electronics Forum | Wed Oct 09 12:24:11 EDT 2002 | dphilbrick

Why not go to VOC free flux. It is a water based no clean. Clean it when you need to and leave it when you don't have to clean. We have used it for several years. We do Military and Commercial - passes for all so far.


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