Electronics Forum | Tue Jun 16 09:03:57 EDT 1998 | Justin Medernach
| I'm off (as you all know) to other pastures. You know - sheep tupping on the green (or some other Elizabethan BS). Anyway, I now have to go to work for a living, or retire (don't remember which), to make a living. | Deeply invloved in micro BGA, C
Electronics Forum | Mon Jun 25 20:59:51 EDT 2001 | davef
As Wolfgang says: Conveyor speed may be too high. Excuse me for not stripping-out my repetition from your list, but other machine adjustments to consider are: * Using more efficient [higher specific gravity] flux. [Got it!!!] * Adjusting wave shape
Electronics Forum | Tue Apr 28 21:48:50 EDT 2009 | davef
Confirm the source of the issue. Run a coalescence test on both lots of paste. A simple coalescence test can quickly determine the condition of solder paste after prolonged use. Simply print a small disk [around 4-5mm diameter and 0.2mm thick - a bu
Electronics Forum | Wed Jun 03 21:25:33 EDT 1998 | John Allan
| Hello: | BACKGROUD: SMT components soldered on the top-side of boards that also require wave soldering have the potential to reflow during wave soldering. Reflowing these components during wave soldering is not good. It can cause cold joints, op
Electronics Forum | Thu Jun 04 08:32:21 EDT 1998 | Dave F
| | Hello: | | BACKGROUD: SMT components soldered on the top-side of boards that also require wave soldering have the potential to reflow during wave soldering. Reflowing these components during wave soldering is not good. It can cause cold joints
Electronics Forum | Fri Sep 14 15:31:02 EDT 2001 | davef
How in earthly heaven would someone else have a report analyzing the defects on your boards? Among the good failure analysis labs that can assess situations like yours are: * Robisan Laboratory 6502 East 21 St Indianapolis, IN 46219 317-353-6249 fax
Electronics Forum | Fri Apr 11 09:36:55 EDT 2003 | davef
We don't know anything about using "old Tango for DOS". First, consider the fabricator of your part as the THE most appropriate place to look for layout recommendations. We've discussed the heirarchy of sources for layout information previously he
Electronics Forum | Thu Mar 15 17:19:12 EST 2001 | mparker
Are the tin/lead ratios compatible betweem HASL and wave solder? Probably are, just a remote possibility. Flux application is? bubbler, sprayer? Either way, are you getting good misting, coverage on those teeny 0.5mm test points? If not, then no
Electronics Forum | Mon Sep 05 01:38:12 EDT 2005 | plcc
I hv a PCB (mtrl is RF35). After going thru' reflow, we found yellowish stain on the solder pad (solder mask). It looks like burn-marks. The reflow temp use is 245oC. We tried running bare pcb under 220oC, there's minimum stain found (acceptable),how
Electronics Forum | Tue Sep 09 11:53:36 EDT 2008 | davef
We consider "IR-reflow soldering profile" to be the supplier's recommended reflow thermal profile that a component temination 'sees' for proper soldering, regardless of the method used to reach that temperature. When you say, "We have a lot of defec
