Electronics Forum | Tue Mar 18 11:53:58 EDT 2014 | sara_pcb
Our contract manufacturing agency have procured pcbs from approved vendor. After assembly we found solder mask separated from the PCB on the epoxy area as patches. The top side is intact. also over the pcb tracks, the mask got damaged. In what c
Electronics Forum | Thu Aug 22 22:10:26 EDT 2002 | davef
Ooooow! �Can it be fixed?� Good question. How BAD did you damage it? * Since you are asking this question, I am NOT inspired by the potential that you have the skills to fix the board. Go Jeff Ferry�s site at Circuit Repair Center [If you can�t f
Electronics Forum | Tue Feb 03 14:19:29 EST 2009 | grics
I would agree if you have a board to setup the process. But sometimes this doesn't work... If for some reason if the customers AVL has a Lead Free BGA and I am running Leaded paste (yes this really happens!), you will need to run hotter to get your
Electronics Forum | Mon Oct 28 18:59:25 EST 2002 | tkenny007
Specs for Bow and Twist for PCBs (IPC-A-610C, 10.6. There may be an update by now). I also have a note in our quality guide referencing (IPC-TM-650, 2.4.22) and (MIL-STD-105D). In summary, a PCB should not bow more than 0.040" with all four corner
Electronics Forum | Wed Feb 08 03:35:58 EST 2006 | GS
100�C) the moisture changes in vapour/gas generating an internal pressure causing in the worst case damages like internal planes delamination, popcorn effects, degassing, ecc. So you can understand why before reflow it could be necessary to backe and
Electronics Forum | Wed Jul 15 12:31:20 EDT 2009 | rwyman
Depending on the end use of the PCB, edge or corner bonding may be adequate. Much easier to rework as the material is only at the perimeter of the part. We don't do underfill of any degree in-house but a few years ago we did build a limited run of
Electronics Forum | Tue Jul 14 18:42:41 EDT 2009 | anndi
1smtdude, I interested in your explaination of > re-work an underfill part. You mention the > material can be heated to a plastic state to > become vicious... do you know usually what range > is the temperate? (guess it can depend on the > type
Electronics Forum | Fri Apr 20 07:30:14 EDT 2001 | wbu
In short: the measured deviation / the length this deviation occurs * 100% = % of deviation Actually we encounter mostly "twist" so we put the board on a flat surface, hold it down at the corners to see if any of the corners lifts, measure the heig
Electronics Forum | Thu Nov 13 11:45:04 EST 2008 | pbarton
We have seen a similar problem. Turned out to be mechanical stress on the component caused by the method of location and clamping at ICT. Where is the component located on the assembly? Poorly adjusted clamping pillars on clamshell fixtures can cause
Electronics Forum | Thu Nov 14 05:45:51 EST 2002 | Jon O'Connell
Has anyone had experiences of ICT test fixtures actually damaging the PCB boards - typically when they have moved away from HASL finish to OSP. I would also like to hear more about any specific issues seen at ICT for non HASL pcb finishes thanks -
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