Electronics Forum | Wed Apr 09 22:58:10 EDT 2008 | davef
We wonder about: * Solder mask encroaching onto the component pads. Please describe the solder coverage on pads where there is tombstoning. * History of the issue. How long has this been going on? Have you ever produced non-tombstone board consisentl
Electronics Forum | Wed Apr 30 07:33:12 EDT 2008 | davef
It's not acceptable to us. More importantly, you need to determine if it's acceptable to your customer. Recognize that your little IPA scrub does NOT remove the OA flux residues from the board. It mearly spreads them out across the board and under c
Electronics Forum | Wed Jun 11 09:35:07 EDT 2008 | grics
Out of curiosity, what is your top side peak temp @ reflow? Have you inspected the boards prior to SMT (at your 5DX machine?) Also, have you tried to run the board through reflow with out any parts or bga placed and inspected? I how long are you in
Electronics Forum | Tue May 27 11:27:46 EDT 2008 | muarty
Also looks like there maybe an issue connected to the pallet/board not pushing the solder over the back of the nozzle properly. Maybe the wave level is slightly low so any dross that is on top off the solder wave isn't being pushed away by the pallet
Electronics Forum | Tue Jun 03 15:18:33 EDT 2008 | jdengler
As chunks says use the paste manufacturers recommendation. Our paste manufacturer has recommendations on both �straight ramp� and �soak� for our paste. We prefer the �straight ramp� on most boards due to the increased production it enables. There a
Electronics Forum | Tue Jun 17 12:38:33 EDT 2008 | john_smith
We are also using Vapor phase for our process. We currently have 6 profiles that we have established. 3 for Leaded and 3 for Leadfree. We have set-up our profiles depending on the mass of the board. We do have some tombstoning depending on several va
Electronics Forum | Tue Jul 01 18:51:06 EDT 2008 | proy
I am learning to use this SPM now, and I found that when I go to define a board size, you select the parameter box, then the parameter (like Board size X....) - I can only change the value by rolling the mouse ball, the side bar which is shown in the
Electronics Forum | Wed Jul 23 05:26:23 EDT 2008 | aj
Hi all, Thanks for all the replies. I got some XRF carried out on the boards ( ENIG) and they measure 0.03-0.04 microns of gold thickness. Boards that we have had no problems with measure 0.07-0.1microns. This looks like the main contributor alon
Electronics Forum | Wed Jul 16 16:05:44 EDT 2008 | dyoungquist
Try Prototron Circuits. They have manufacturing plants in Redmond, WA and Tucson, AZ. We buy almost all of our circuit boards from them and have had very few quality issues for several years now. Not the cheapest out there but one of the higher qu
Electronics Forum | Mon Jul 21 12:13:04 EDT 2008 | shrek
The industry mantra for the past decade or so has been minimizing material costs and inventory turns. Buyers in the EMS are given directives to buy as cheap as possible to meet these directives. Consequently, they cheap out on the most important pa
