Electronics Forum | Wed Dec 15 08:30:02 EST 2010 | davef
We side with your operator. Poor pad design is the largest contributor to component shift. If you posted pictures, we might have a livelier discussion about alternate explanations.
Electronics Forum | Thu Mar 03 08:06:36 EST 2011 | scottp
I've seen this with through hole via in pad with soldermask plugging from the opposite side. Baking the boards solved it. Not using such a horrible via in pad method would also have solved it, but that wasn't an option. Is this ball sitting on a v
Electronics Forum | Fri Mar 04 09:50:41 EST 2011 | wrongway
Hello all are you using h.p. gold spliceable feeders if so there is a black knob on the side of the feeder that has to point to correct pitch
Electronics Forum | Mon Mar 21 12:36:22 EDT 2011 | scottp
I would run the passive side first just because the BGA is probably moisture sensitive and I wouldn't want to have to keep track of the time between first and second reflow.
Electronics Forum | Mon Mar 21 12:43:20 EDT 2011 | hegemon
Passives first reflow, and BGAs second side reflow. Uses only one heating cycle for your BGAs, and the passives will stay in place just fine given correct profile parameters. There are a few exceptions, but this is generally how it is done. My $.02
Electronics Forum | Fri Mar 25 04:28:54 EDT 2011 | grahamcooper22
Are the solder balls what we would call ' mid chip ' solder balls where a single or sometimes a few larger solder balls are positioned somewhere along the side of the chip or are they the solder paste powder particles spread around the pads ?
Electronics Forum | Mon Apr 11 04:13:38 EDT 2011 | lisalau
Hi all, How about the Sony Chip Shooter in your side? Are they difficult to sell? BTW,who has Sony Feeders for selling?Pls contact me,i need it urgently. Thanks&best regards! Lisa
Electronics Forum | Mon Jun 20 02:43:55 EDT 2011 | milroy
What is the correct FR4 for RoHS? This PCB is a 4layer board. When we get the boards from the supplier they are properly packed in vaccum sealed bags without HIC card but there is desicant in side.
Electronics Forum | Wed Jun 15 10:04:52 EDT 2011 | steveblackecmpe
I have a wave that does NOT have top side preheats. I have not worked with a machine like this in the past. The majority of my experience revolve around topside temps prior to entering the wave. Has anyone else worked with a process like this? What a
Electronics Forum | Wed Jun 15 11:41:14 EDT 2011 | patrickbruneel
You don’t need top heaters as long as you can reach the flux manufacturers recommended board top side temp.
