Electronics Forum | Thu Feb 28 21:01:09 EST 2008 | davef
Tony: Thanks posting information about your experience with strippers. First, why did you need to strip the entire board? Next, please clarify the following points to expand our knowledge of using Humiseal 1063 Stripper: * How long was the conforma
Electronics Forum | Fri Feb 29 08:12:56 EST 2008 | davef
Solder paste suppliers often make recommendations on solder paste handling after removing it from the container [eg, jar, cartridge, etc]. For instance, Multicore Solder Paste Handling Guidelines, September 2004 says: As a general rule, paste that h
Electronics Forum | Tue Mar 04 08:56:38 EST 2008 | tonyamenson
I talked to a solder paste chemsist and found out a few things. From above (Dave F) states a test for solder paste involving reflow on a non-wettable surface. Commonly known as the solder ball test this test is performed all the time by paste manufa
Electronics Forum | Thu Apr 03 22:56:48 EDT 2008 | davef
Potential impacts of using expired solder paste are [University of Bolton]: * Changed paste rheology. Result: poor print quality * Loss of solvents. Result: reduced flux activity * Changed flux formulation. Result: More difficult to clean flux residu
Electronics Forum | Mon Apr 14 19:26:35 EDT 2008 | diesel_1t
Update: Recently, we ran a (old) product on which they made a new stencil, appertures 1-1 on 0603. As soon as they began to run, tombstones appear. I went to trashcan to rescue old stencil, and noticed that pads came with a "c" shape reduction, I as
Electronics Forum | Thu Apr 17 05:14:40 EDT 2008 | gregoryyork
I have seen similar things like this before with Solder Resist redepositig back on the pads, this is a clear residue very hard to see. Solder resist will obviously resist solder adhering to it. If you rework the boards then the heat of the iron will
Electronics Forum | Tue Jul 15 10:05:23 EDT 2008 | patrickbruneel
Ck, Just to make myself clear I am not at all questioning your observations. What am trying to make clear is that when your wave contact area changes when the PC board or glass plate traveling speed is changed, something is wrong!!! Also an 180Deg
Electronics Forum | Fri Sep 05 15:10:18 EDT 2008 | tony_d
Hello Federico, I know what you are going through. A few years back, I was faced with having to purchase AOI equipment for my business. My selection team and I looked at several different manufacturers including MVP (too difficult to program!). We
Electronics Forum | Fri Sep 05 19:56:56 EDT 2008 | hegemon
We did extensive side by side (by side) testing of three AOI machines Omron, YesTech and Mirtec. In the end, even with weighted scores, the difference in the top two machine was still only four/tenths of a point. Third place was a distant 14 points
Electronics Forum | Wed Jan 07 00:18:14 EST 2009 | milanrit
Recently on one of my assemblies(sn/pb) I started seeing leaded BGA failure at functinal test for opens, but when I inspected them through 5DX and ERSA Scope it doesnt seem like there is any opens or insufficient and half no. of boards passed functio
