Electronics Forum: change over (Page 1 of 98)

Solder paste change

Electronics Forum | Mon Mar 31 11:10:43 EST 2003 | davef

First, most �thermal shock� recipes are not a reliability test. There is no relationship between the failures seem in these tests and in-use application. These tests show you the failures in these tests. That�s it!!! Second, accelerated life test

Conformal over No-Clean

Electronics Forum | Fri Apr 26 09:32:22 EDT 2002 | blnorman

We conformally coat over NC solder paste. No problems. We're using a platinum catalyzed addition cure silicone. The only concern with this conformal coating is cure inhibition. You must test the coating over the residues to be sure there is no in

soldermask color change around vias

Electronics Forum | Fri Jun 07 11:08:34 EDT 2019 | gregoryyork

OK good if you get really close to the two small solder balls trapped in that greasy waxy residue and carefully turn the balls over you should see that they are flat on the side stuck to the solder resist.

soldermask color change around vias

Electronics Forum | Fri Jun 07 12:34:30 EDT 2019 | teejsd

C3 just uses heated DI water that it applies, then pulls back into a disposable cartridge. Machine then applies a 10V charge to the sample & measures leakage current(nA,I think) over time(sec). If the leakage current is high enough/fast enough, you

soldermask color change around vias

Electronics Forum | Fri Jun 07 12:44:55 EDT 2019 | gregoryyork

These residues are extremely water miscible BUT you will probably need the extraction of heated IPA/Water to get the porous resist to release the residue quicker than it would do releasing it naturally in the field. Why dont you try to soak the circu

soldermask color change around vias

Electronics Forum | Fri Jun 07 14:14:24 EDT 2019 | teejsd

Yes neither our HPLC IC nor our C3 could detect any concerning levels of ionics. Soaking over a weekend sounds like a good idea, though I may still need to cut the board down to fit our Kapak bag size. And get our silicone coating off the surface. K

Re: Kapton tape over displays

Electronics Forum | Wed Sep 27 19:57:41 EDT 2000 | Dave F

Our display suppliers provide displays either with: * Molded plastic cover that we recycle to them * Plastic film like the guys that change your oil put on your wind shield to remind you when to get your oil changed.

Poor reflow over gold plating

Electronics Forum | Wed Jun 29 17:18:41 EDT 2005 | GS*

Very interesting tread, many thanks to all. Matt please, now what does it mean for you? Will your custmer accept dull solder joints or will the plating be changed ? (ie. HASL, ENIG, etc) Tnks and regards GS*

How SMT Line Change over is measured?

Electronics Forum | Tue Feb 26 08:52:35 EST 2013 | stephendo

Do you also measure job run time? IF you don't I"m sure if the change over time is measured but not the run time then the run time will go up almost as much as the change over time goes down.

Board change and solder not adhereing completely

Electronics Forum | Fri Apr 06 08:27:09 EDT 2001 | CAL

From what you are saying................If I hear ya correctly - There is no "Proctective" on the Pads (OSP, HASL....) You will be hard pressed soldering to bare copper. This can not be right. My suggestion- go polyimide with electroptical connecti

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