Electronics Forum | Wed Jan 28 08:56:40 EST 2009 | blnorman
Don't know the specifics from the IPC spec. However our standard internal spec dictates - highest thermal mass, lowest thermal, most critical component, and center of PCB on the laminate surface. Our profilers have 6 inputs, so the other 2 are dete
Electronics Forum | Mon Jun 07 15:11:43 EDT 1999 | Earl Moon
| | | | Where I can find some informations about repairing of SMT boards? | | | | | | | | Thanks | | | | | | | | Marcos | | | | | | | A first place to start is IPC's 7711 and 7721 encompasing repair, modification, and rework procedures. | | | |
Electronics Forum | Mon Jun 08 15:00:08 EDT 1998 | Earl Moon
| I work QA at an OEM in Alberta, Canada. I saw earlier posts on the smtnet regarding PCB haloing criteria. I am currently in a dispute with my PCB vendor over the acceptability of haloing (delamination) around plated through holes and vias on a lot
Electronics Forum | Thu Dec 04 09:49:11 EST 2008 | lazzara55
Dear Steven: Often the recommendations for baking prior to assembly are derived from various J-stds. But J's currently concern baking moisture out of components, and fail to address the moisture issues of the PCB. Because of that, there is the IPC D
Electronics Forum | Sun Jul 14 04:39:35 EDT 2019 | alexeyzb
I have changed job and now i have some problems. Previous experience was with high volume production and not so high quality level (class 1, 2 according IPC). Now i need to produce very high quality (and very expensive) PCBAs in Low volume production
Electronics Forum | Tue Jul 03 10:20:15 EDT 2018 | yannis
Our firm is SMT factory exclude design, components are selected by customers. We are going on a project by studying the solderability life of warranty at least 3 year for customers requirement. The theory is if the workmanship is good enough, then th
Electronics Forum | Fri Jan 15 17:13:07 EST 1999 | Earl Moon
| | | | Hello, | | | | | | | | We are qualifying new sources of PWB vendors. We've got the first lot of "produciton" boards in and we want to put them through the paces before turing the vendors on. | | | | | | | | So far, the tests I can think of
Electronics Forum | Fri Jan 15 15:17:21 EST 1999 | Earl Moon
| | Hello, | | | | We are qualifying new sources of PWB vendors. We've got the first lot of "produciton" boards in and we want to put them through the paces before turing the vendors on. | | | | So far, the tests I can think of performing, and tha
Electronics Forum | Thu Aug 14 21:58:43 EDT 2008 | proy
NO WAY I had seen this 10 years ago, and got into a 'p' match with the PCB fabricator. We had failures after wave solder, the thermal ezpansion caused cracks in the 'knee' where the skinny little trace go's over into the barrel. even if not failin
Electronics Forum | Tue Sep 09 12:05:44 EDT 2008 | tonyamenson
First and fore most is to find your paste manufacturer spec sheets. Read it over several times and let it all sink in. Then call them with questions as they want to keep your business so their engineers want to help you use their product. I assume y
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