Electronics Forum | Tue Jul 15 10:47:23 EDT 2008 | Emil
8+2cooling) paste Aim NC254 Thanks in advance!
Electronics Forum | Thu Jul 17 20:41:11 EDT 2008 | davef
"Are you sure your washer is set up correctly?" Now, that's funny!!!! ;P
Electronics Forum | Fri Jul 18 07:18:34 EDT 2008 | realchunks
Try using a homeplate design on your stencils. Works every time.
Electronics Forum | Tue Nov 12 13:03:38 EST 2019 | alexeyzb
Some problem with screen printer process. You need to show photo of defect for understanding.
Electronics Forum | Sat Jul 26 07:31:14 EDT 2008 | bobwillis
We have created a new online free database on process defects at NPL which you can search. http://defectsdatabase.npl.co.uk There are many reasons for solder balling on wave and reflow and examples are provided. You could always use the database t
Electronics Forum | Wed Nov 20 09:23:53 EST 2019 | alpha1
We had a board we fought with for a while with solder balls. Checked everything, Stencil thickness at .004, reduced apertures, changed paste 3 times, changed profile 3 times. Finally changed board vendors. Went from HASL to Emersion Gold. Problem sol
Electronics Forum | Thu Jul 17 20:46:55 EDT 2008 | davef
Which type? * Solder beads (mid-chip solder balls, attached to the waste line of your chip caps and resistors) This is more paste volume related. * Solder balls that tend to be more randomly scattered (as in spattered)? This tends to be more profile
Electronics Forum | Mon Jul 16 14:48:16 EDT 2001 | mparker
Just received "Circuits Assembly", July 2001 issue. An article regarding solder balls and aperture design, beginning on page 40. This DOE had aperture, reflow profile and no clean pastes (3 types) as attributes. It is advocated that a U-shaped a
Electronics Forum | Fri Jun 25 09:19:12 EDT 2004 | tjensen
60-70% RH will be a challenge if you are running a water wash solder paste (and could be the reason you are seeing the problems). If you are running a no-clean, humidity should not be an issue. As long as the profile looks OK, I don't think the con
Electronics Forum | Fri Nov 15 00:08:01 EST 2019 | ramesh_10377
hi i recommend following actions. 1) check the location where most solder ball is finding 2) verify the printer setting parameter if the problem is still persisting please go below action 1. Stencil thickness should be 4 mil 2. Aperture ope
