Electronics Forum | Fri Jan 30 15:11:50 EST 2009 | joseluis_amper
Dear Sir. Recently we had a problem in our production. We had pcbs with no RoHs (with solder Pb in pads) but we used paste Lead Free. I want to know if we will have problems in this solders in the future, because (perhaps)the solder will be broken, o
Electronics Forum | Tue Jul 31 00:48:55 EDT 2001 | Frank
Sorry I forgot to provide enough information. Stencil thickness is 6 mil Aperture width is 10 mil Aspect ratio (aperture area / wall area) = 0.72 Solder paste mesh size, type 3 (-325 +500) With this aspect ratio we can printing without any probl
Electronics Forum | Mon Jul 30 01:34:46 EDT 2001 | mugen
Best thing to do, is consult your solder paste supplier, bring him/her in, and ask for their humble professional opinion? If they refuse, strongly consider switching to a supplier, with responsive "humble professional opinions" to share, one that spr
Electronics Forum | Fri Jan 30 18:24:09 EST 2009 | gsala
Buenas dias Jos�, It shoul not be a problem. We had situation like that when in the early 2006 the Lead Free fase in Pb fase out, no pbm on solder joints. Today, after about 3 years, those cards are stil working in the field without any defect. Reg
Electronics Forum | Mon Jul 16 10:44:29 EDT 2007 | Jacky
Hi All, Recently, we encountered strange defect at our SMT line. We can see solder ball spatter around at one of the component pad. This lead to insufficient solder defect at 1 side of the component. The other side of the component look good(Meet
Electronics Forum | Thu Apr 26 20:18:45 EDT 2007 | hegemon
For what it is worth, we are purchasing a dispensing system including a Robotic Arm, Positive Displacement Valve (as opposed to volumetric displacement) and Controller. We have purchased this unit for doing lead free 20 mil dots at 30 mil pitch in s
Electronics Forum | Mon Jan 30 05:58:39 EST 2017 | rob
Hi all, > > Am new to SMT here. > > I have a very > thin laminate substrate which around 120um > thickess. Being that thin, warpage is constantly > an issue for us. > > For the solder printing part, > we have a number of problems. > > Being s
Electronics Forum | Fri Apr 01 02:56:18 EDT 2011 | grahamcooper22
the cause could be moisture in your pcbs. To check it...pass some bare pcbs through your reflow oven (this is a simple way of drying them out a bit), then paste and place and reflow as normal....if solder beads disappear then the pcbs have too much m
Electronics Forum | Mon Nov 14 12:23:56 EST 2005 | russ
What is the finish of the PCB? What type of paste are you using?
Electronics Forum | Wed Jul 15 17:47:59 EDT 2015 | mikekeens
I've read different views on this but the best results i've seen are from when the misprinted PCB is put directly into an automated 'spray-in-air' cleaning machine and cleaned using an appropriate cleaning chemical. Any attempt to manually clean the
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