Electronics Forum | Tue Jun 17 09:24:43 EDT 2008 | rgduval
Could it be from a dirty stencil, rather than from the pick and place operation? We've seen a number of occurences recently with solder balls near some of our fine pitch components...we eventually diagnosed as dirty stencils...excess solder on the b
Electronics Forum | Wed Jun 18 08:57:45 EDT 2008 | more_sunshine
thanks for the post... but are you sure that the type of mask i mentioned is photoimageable and as i understood can be removed from desired places (pads/soldering areas) using uv and developer (which i don't know what material is it). and also the
Electronics Forum | Wed Jun 18 20:27:28 EDT 2008 | davef
No, we not sure if your solder mask is LPI. The article we linked was aimed at solder mask application methods. LPI is the most common mask in use today. So, what kind is it? Green tells you nothing. Solder mask can be a variety of colors.
Electronics Forum | Thu Jun 26 09:30:24 EDT 2008 | gabriella
Hello, about 20mm - some kind of inductance for this week. If I were you, I would check another brands of ovens too. I mean why the clearance is so small and why they want to charge you for their mistakes? I would insist to do that for free. Next
Electronics Forum | Wed Jun 18 11:29:20 EDT 2008 | 1036
Anybody here please help me solve the problem with my MPM SPM screen printer? We bought a used SPM screen printer recently. When we boot up computer we got a message saying " the mouse is not responeing", and finally the system terminates the progra
Electronics Forum | Thu Jun 19 05:14:18 EDT 2008 | sckee
Hi, Need help on the CCGA solderability criteria.I've actually run a NPI that using CCGA yet not sure whether the solderability is accepted or not. The alloy of the column is 80/20 and the surface of the solder joint is not smooth and shine. By chec
Electronics Forum | Thu Jun 19 11:43:05 EDT 2008 | Roy
When the component suppliers specify the cap as no more than 50sec (or even less time)above 200C, is there any way the lead-free profile window will fit if we wil have to achieve a peak temp of 230c for at least 30sec for the lead-free process? maybe
Electronics Forum | Thu Jun 19 12:07:09 EDT 2008 | ck_the_flip
You answered your own question! Vapour phase is the way to go for this. Conventional ovens won't allow this, unless you find away to defy Physics. That's an absurd constraint to begin with: 200C. Most Sn-Pb profiles require 205 - 210 minimum for
Electronics Forum | Thu Jun 19 12:27:14 EDT 2008 | guqing
Thanks CK. You are right the 200C constraint is absurd, but it's the reality, and the worst is this kind of components will go through lead-free profile. Do you or any body here experiencing the same problem? any body using Vapor phase and having suc
Electronics Forum | Thu Jun 19 12:40:09 EDT 2008 | realchunks
If I read this right, it says 50 seconds or less above 200C. It doesn't say you cannot go above 200 C. Right? if so we do it all the time. We have some Quality gurus here that always blame our ovens for everything form a didle-I-Joe to a Dam-If-I
