Electronics Forum | Wed Mar 28 14:11:19 EDT 2007 | pjc
It should only be a visual thing. What may be happening is that all the thermal energy being driven into the wave solder pallet to get good soldering is causing the no-clean residues to burn up a bit, causing the discoloring. Check to see if they hav
Electronics Forum | Tue Feb 17 13:54:26 EST 2009 | snsmt
Hello All, I am trying to find some answers regarding acceptability of a RJ-11 Connector (phone jack). We have just received thousands of these connectors in and some of the gold plate contacts show some discoloration. The contacts are pink. I was w
Electronics Forum | Sun Aug 23 11:42:01 EDT 2009 | ysutariya
Hi Dave, I haven't tried the Probimer yet, but the Taiyo ink didn't hold up too well. As a PCB fabricator, finding a white soldermask that has good trace coverage and survives 4X solder immersion (HASL) is like the holy grail of white soldermask.
Electronics Forum | Mon Apr 26 18:09:07 EDT 2010 | hegemon
Obviously knowledge in this area is still in a bit of a 'flux'. Dave, you had the right idea, the "putz"s signed off on the responsibility, and sent a new batch o'boards. FAST. This new batch were at least date code in 2010, and we had no issues so
Electronics Forum | Thu Sep 09 13:25:22 EDT 2010 | eezday
I've seen the purple silkscreen before on ENIG board built with PbSn process. I would think that if temp is the issue the lower process temp would not have caused the purple ink. I remember that the flux I used was water soluble and I attributed th
Electronics Forum | Wed Nov 13 18:00:59 EST 2013 | davef
It's too bad that SMTnet won't let us view your pdf. I asked the geeks to fix that. If someone really want to read it Matt can likely get it off to you. Is it OK to do that, Matt? Anyhow, the Trace Labs report seems to be focused on some SMT pad dis
Electronics Forum | Tue Jan 08 08:52:30 EST 2019 | ameenullakhan
Hi Steve, We did the below trials today. 1. Run the board in O2 environment. result : Yellowish appearance was observed. After DI water Cleaning : Still the yellow color is there. 2. Same board run secondary side. Result : First side board yel
Electronics Forum | Mon Apr 12 19:28:26 EDT 1999 | Tom B
Netters, When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? 1. Kester 293 no clean 2. 2.1 C/s for 30s to 150 C 3. .5 - .7 C/s for 60s to 185 C 4. 1.5 C/s u
Electronics Forum | Tue Apr 13 18:11:00 EDT 1999 | Jimmy Strain
| Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185
Electronics Forum | Mon Apr 19 11:21:03 EDT 1999 | Travson
| Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185
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