Electronics Forum | Thu Jun 29 12:07:09 EDT 2017 | georgetruitt
HOW THICK IS THE BOARD? IS THERE A LOT OF COPPER IN THE BOARD? DOES YOUR CUSTOMERS PROVIDE HEAT RELIEF IN THE BOARDS BARREL DESIGN THERE NEEDS TO BE PLENTY OF ROOM FOR LEADFREE SOLDER TO FLOW, DID YOU CHECK YOUR PIN(LEAD)TO HOLE (BARREL) RATIO? N
Electronics Forum | Tue Aug 08 21:00:24 EDT 2000 | Dave F
Shawn: You're correct most solder preform manufactures don't want to sell preforms without skinning you alive for tooling charges!!! Considering alternatives, can you print or dispense paste? It would be mucho cheaper. We've talked about using pa
Electronics Forum | Thu Jul 27 13:59:04 EDT 2000 | Chrys Shea
Sounds like the problem is design realted - here's a cheesy trick if your product/process permits: (you know how I love my cheesey tricks!) Put an adhesive dot between the pins that are bridging. If you're gluing bottomside SMT components to the bo
Electronics Forum | Wed Jun 14 18:21:23 EDT 2000 | Robert Moore
It has been our experience that the problem you have discribed was not solder process related. We had two such instances in the past and both were component related. The first case involved a PLCC28 that failed test. Reflowing the solder seemed to co
Electronics Forum | Wed Mar 21 21:28:22 EST 2001 | davef
We have RF boards with ... * No solder mask * Strategically placed globs of solder It's possible that your boards will not work with NC flux res on them. We generally don't see noise problems. We loose one of the edges [front I think, but don't
Electronics Forum | Fri Apr 13 12:37:35 EDT 2001 | edylc
>>> gold finger was covered by a Kapton tape and it was done offline away from the Screen printer or rather from the SMT lines itself, we are using an ENIG Pcb's , the process doesnt need a wave soldering ....however at the final end of the line ,
Electronics Forum | Thu Jul 20 16:28:55 EDT 2000 | Bob Willis
Most robust wave soldering machines will cope with lead free alloys. The temperatures in air that we have run has been between 260-265C. In my opinion the dross generation has not been significantly effected. I was doing a workshop for a well known
Electronics Forum | Tue Dec 14 10:36:42 EST 1999 | Paul Peterson
I recently encountered reflow soldering defects on a pair diode package, the smd pad had a green contamination, I'm convinced that this is not oxidation. The no-solder condition appears to be caused by a sloppy soldermask process, although over the y
Electronics Forum | Tue Apr 13 08:08:33 EDT 1999 | Rob Palson
We process both tin/lead plated boards and gold plated boards in our surface mount group. I have used Sn62/Pb36/Ag2 solder paste on all gold plated boards to help prevent gold scavaging. To reduce the amount of different solder pastes we have to bu
Electronics Forum | Wed Jan 14 00:02:10 EST 1998 | jerry
I have a problem! The solder on my pc boards look great comeing out of my reflow oven. They go thrue the rest of the prossese and at the end at the qc station it's cold or whitish or gray not shiny. does any one have a idea on how to correct this pro
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