Electronics Forum | Wed Aug 27 14:38:20 EDT 2008 | rgduval
Does your paste provider recommend a TAL? For the leaded and lead-free pastes that we use, the manufacturer recommends 60 seconds above liquidous. I note that your profile shows the TAL as 30 seconds, which may not be sufficient. That said, tho
Electronics Forum | Thu Aug 28 11:13:53 EDT 2008 | janz
Have you tried to run the same process but with diffrent solder paste manufacturer.? This give you information whether paste is ok. Try also print paste on the bare board and run through reflow oven. Check 2-3 boards. Is it the same places where i
Electronics Forum | Mon Dec 15 15:34:17 EST 2008 | dyoungquist
Sorry it has taken me so long to respond. I got pulled off onto other projects and was not able to work on the solution to the problen until recently. The solution we have come up with is to change from no-clean flux based solder paste to water sol
Electronics Forum | Sun Sep 09 08:38:14 EDT 2018 | devinpcb
I have found the paste flux is the worst. It leaves a black residue that can corrode.
Electronics Forum | Tue Jan 13 19:41:43 EST 2004 | Tom B
Chris, 1. You may want to check lead finish (plating). 2. Is there shadowing? 3. Is Pik-n-Place providing enough pressure to slighlty push part into paste? 4. Is this a new product? or existing? If existing has suppliers for parts changed? 5. Is
Electronics Forum | Mon Aug 25 18:27:58 EDT 2008 | dyoungquist
Here is a post of the current profile. I have contacted our solder paste provider. They give a general lead free reflow profile guide. All that shows is genreral recomendations for temperature ranges and time ranges in each section of a typical
Electronics Forum | Wed Aug 27 15:48:05 EDT 2008 | grics
Again, our paste manufacturer specifies TAL to be 30-60 seconds. Out of curiousity, how would part placement cause de-wetting? I am fairly new to SMT so elaboration would be helpful... Thanks
Electronics Forum | Fri Aug 29 10:37:44 EDT 2008 | gdzuber
Very interesting problem because it shows how systemic this kind of problem can be. So many variables, right? Firstly, discussions here are similar to everyone's postings, but there are some different observations. The manufacturer��s profile, we t
Electronics Forum | Wed Jan 14 07:32:15 EST 2009 | mosborne
They claim that they confirmed this with PPM. I plan to be at this site next week so I cna have a look for myself. I thought also a potential encoder until they said the problem went from y to x. I have replaced encoders that cause this problem in th
Electronics Forum | Wed Aug 27 14:19:40 EDT 2008 | grics
Have you given this information to your paste manufacturer???(Profile, Pics of defects?) The profile seems to look ok(without knowing paste info...) I think the ramprate looks a little aggressive but it could be the scaling of the profile and the i
