Electronics Forum | Thu Aug 17 05:56:39 EDT 2000 | Jacqueline
Hi Folks, Hope yous can help. I'm having a problem when reworking (placing) 40mil BGAs. One side seems to be collapsing more so that the other, resulting in the outer row of balls not properly reflowing and making the connection. This is only happeni
Electronics Forum | Thu Aug 17 07:48:46 EDT 2000 | Kamran.T
Sounds like improper heat distribution! Raise your prheat/soak time to assure even heating of the board∂. Another issue could be the moisture causing this anomaly.
Electronics Forum | Thu Aug 17 08:32:49 EDT 2000 | Jacqueline
Thanks for your comment; if it is an unbalance heat distribution, why is it reflowing some cards with the BGA?? If it was a incorrect thermal profile, wouldnt they all be displaying the same problem? All boards & comps are being baked prior to rewor
Electronics Forum | Thu Aug 17 08:47:58 EDT 2000 | Wolfgang Busko
Again me, how about your room? Someone opened a door or window. Encountered that nasty influence with my old IR reflow system. Wolfgang
Electronics Forum | Fri Aug 25 02:15:42 EDT 2000 | SMT Tech
Is it board specific? If so I used a piece of sheet metal between the board and the heaters to correct a similar issues, where a ground plane was absorbing the heat.
Electronics Forum | Thu Aug 17 08:44:14 EDT 2000 | Wolfgang Busko
Hi Jaqueline, my first thought goes into the same direction, twist or warp (either the board or the BGA itself). I don�t know the SRT equipment. I�ve noticed with our equipment using a spot underheat element caused some warpage of the PCB making it
Electronics Forum | Thu Feb 12 10:31:43 EST 2004 | Glen Roberts
I have been actioned with introducing a new fault data collection system within our Business. We are a high mix, low volume, pca contract electronic manufacturer. Currently our manual inspection stations fill out hard copies of QUAD sheets listing a
Electronics Forum | Sat Feb 21 21:25:59 EST 2004 | Ken
Check out Technomatix Unicam quality system. Uses bar code and computer terminal.
Electronics Forum | Wed Feb 25 21:26:38 EST 2004 | davef
Start here: http://www.qualitydigest.com/pdfs/0104QD-SPC.pdf
Electronics Forum | Sun Feb 22 15:53:13 EST 2004 | Dreamsniper
Hi, Try using or creating a simple data collection system using MS Access...Try this idea: operator inspects the board, then scans the PCB barcode. Then enters the fault found using the codes you are using in your sheet. It's a bit laborious but it
