Electronics Forum | Wed Mar 24 15:10:23 EST 2004 | davef
Without a proper picture, I'd reject the parts that you describe based on IPC-A-610, 7.2, which says words to the effect: Defect - Class 1,2,3 - Dirt and particulate matter on assembly, eg, dirt, lint, dross, metallic particles, etc. Absence or pres
Electronics Forum | Wed Apr 28 12:10:14 EDT 2004 | paul_bmc
Are your solder balls after reflow a perfect sphere or are they oblong, like chushed. I know a heavy bga or incorrect reflow profile could cause bridging. Also too much flux paste. Sometimes what we do is brush the flux paste onto the pcb pads inst
Electronics Forum | Fri Jun 25 18:57:21 EDT 2004 | Pete
One word of caution, depending on the complexity of the boards and package, the Xray on Jewel Box may not be powerful enough to show the voiding defects within the solder sphere. We ran a board side by side against a high end system and find that out
Electronics Forum | Tue Aug 17 11:31:39 EDT 2004 | Cal
Hello All- I need to replace my Foam flux aerator in my wave soldering machine and need a source. The "Stone" Size is 38x25mm @ 3um. If any one has a source thanks in advance. OBTW- this wave not a "Name Brand" machine (i.e. Eltrovert). Cal
Electronics Forum | Wed Feb 22 21:27:04 EST 2006 | gcolbert
Our solder paste machine has a squeegee problem. After passing over a board, the squeegees don't go all the way back up to their origin state. Then we are getting a timeout error and have to return the machine back to its origin (manually), and pass
Electronics Forum | Thu Jul 05 10:32:56 EDT 2007 | realchunks
WRONG! Actually I was going to say the same thing but figured I would have the standard 3 people dissagreeing with me, and or correcting me. I do believe your wave solder temp should remain a constant temp and prolly will not vary at all, so I woul
Electronics Forum | Tue Oct 17 03:13:10 EDT 2006 | charless
Apoligies Steve if I did not explain myself clearly. We have made the same design using the same RoHs compliant components (which I am assured by the suppliers are process temperature capable) with both lead and lead free solder. Without wishing to
Electronics Forum | Fri Sep 11 15:27:50 EDT 2015 | u4bga
Hi! We're noticing white spots on 2 PCBAs after the selective soldering & DI Wash processes. ----Facts---- 1) The marking is on all boards, irrespective of date code 2) It only happens on leads that have been selective soldered 3) The pattern of w
Electronics Forum | Tue Jul 03 11:56:13 EDT 2001 | Russ Roberts
I am a Manufacturing Engineer working on a new bid. Please help with my question about a new process that I am unfamiliar with: The Assy that we are quoting involves a SMT PCA that is soldered to an aluminum chassis. All surfaces of the chassis that
Electronics Forum | Tue Sep 06 12:39:06 EDT 2011 | deanm
According to IPC-7351A, the optimum fiducial is a solid circle with a minimum of 1mm diameter, but can be up to 3mm. There should be a solder mask clearance a minimum of 2x the radius of the copper circle. So the minimum fiducial size is 0.040" with
