Electronics Forum | Mon Jan 12 13:15:18 EST 1998 | Yves Trudell
In general terms, guidelines for moisture sensitive devices (MSDs) say that you shouldn't put a component through reflow after it has reached its exposure limit with respect to moisture absorption. When using an automated hot air rework tool to remo
Electronics Forum | Tue Sep 25 13:01:48 EDT 2001 | Hussman
If the flux you are applying by brush is alcohol based, use some alcohol on a few failed PCBs and retest. It souldn't take a lot of flux to reflow the balls to a pad that's already covered with solder and flux from the first BGA - unless you are cle
Electronics Forum | Fri Nov 16 14:10:01 EST 2001 | mparker
I have oftened wondered how this industry lets its workers get away from being responsible. The best way I know of is to have them buy their own tools. Just take a look at the trades - carpenters, plumbers, welders, sheet metal men, body repair, mech
Electronics Forum | Tue Jul 16 01:28:48 EDT 2002 | ppcbs
Our BGA Rework process has resulted in 100% yield. We always bake BGA chips at 125 degrees C for at least 8 hours before installation. We always bake loaded boards at 90 degrees C for at least 12 hours before BGA removal. Any parts that went throug
Electronics Forum | Thu Sep 12 18:37:09 EDT 2002 | tiusa
Hi Tony, as you might guess, a Nozzle Mfg. has stepped into this conversation. Having worked with many small, mid-size, and Fortune 500 companies for almost 15 years we have seen many "parts" pick up challenges. We were the first to offer "Complia
Electronics Forum | Wed Oct 16 08:23:09 EDT 2002 | caldon
Dave is right...they are all great machines and all have benefits that cause them to differ... They all jockey for the top spot with in PNP machines. Dave makes a point with his analogy, all are good machines but have specific purposes. Daves range
Electronics Forum | Thu Nov 14 10:03:40 EST 2002 | davef
Doug, Ooooooooo. You're correct Vinny has to be talking about Rogers teflon boards. Vinny, There are many different types of PTFE based products. Generally speaking, PTFE has a melting point of 620degF and withstands solder reflow and HASL proce
Electronics Forum | Mon Jan 13 06:28:15 EST 2003 | johnw
Hi folk's, I'm looking for some help full suggestions here... I've got a ceramic BGA with tn/lead / bismuth balls on it that is over collapsing due to the weight of the momponnet vs the ablity of theball to suppot them. We've spok eto the component
Electronics Forum | Tue Mar 04 18:05:03 EST 2003 | msivigny
Hello Maribel, One way you justify the use of an AOI is to calculate how many defects the system will potentially detect before reflow, associate a repair cost per defect and make the calculation. For an AOI to be effective in this regard, it must sc
Electronics Forum | Sun Mar 23 16:48:23 EST 2003 | MA/NY DDave
Hi "If a PCB board is scrapped because it contains faults that cannot be repaired or it has been damaged, we currently quarantine them for a period of time. Once this period of time has passed the boards are then disposed." Sounds Good, Usually thi
