Electronics Forum | Wed Apr 08 09:28:25 EDT 2009 | swag
We had the exact same problem in early stages of lead-free. Very random positions of defect + some boards were 100% O.K. and others were an explosion of what I see in your picture. Turned out to be bad processing/materials from board house. I'm do
Electronics Forum | Wed Apr 08 11:33:51 EDT 2009 | 1036
2) STD FR4 material with HASL finish, 4 layer board. Reflowed under tin-lead temps with another 4 layer board same time(no delamination problem). 3) We uasualy do not pre-bake board unless board is too old. 4) We do not have the board on hand right
Electronics Forum | Thu Apr 30 22:40:32 EDT 2009 | davef
Selective Wave Soldering DoE to Develop DfM Guidelines for Lead and Pb-Free Assemblies Written by Makram Boulos, Craig Hamilton, Mario Moreno, Ramon Mendez, German Soto and Jessica Herrera Circuits Assembly Magazine, 31 December 2008 19:00
Electronics Forum | Fri May 01 14:39:43 EDT 2009 | jdengler
Swapping a servo amp out does not lead to an alignment issue unless the new amp is way out of adjustment. Did you do a "drift" adjustment after changing the amp? Does the axis vibrate badly while moving? More likely is someone crashed a head which
Electronics Forum | Sun May 10 09:29:23 EDT 2009 | davef
Q1: Can I know is Chromium restricted from RoHS? A1: RoHS Restricted Substances (Pb, Hg, Cr6+, PBB, PBDE, Cd) Q2: Is this chemical will effect the content of Lead free solder? A2: It's possible that the metals that comprise the stainless steel probe
Electronics Forum | Wed May 27 14:29:25 EDT 2009 | jax
Universal use to sell a a device, machine mountable, that could place this connector. I am not sure if they still sell it... It has been 3-4 years since I saw it in action. The upgrade would force the boards stops to remain in the Up position while
Electronics Forum | Thu May 28 09:28:30 EDT 2009 | rgduval
Craig, We currently have an older Heller 1800 and quite like it in production. It easily handles our lead free products, and has enough flexibility to handle both heavy boards and lighter boards. Thermal profiling is relatively easy. I'm told the
Electronics Forum | Mon Jun 08 15:27:25 EDT 2009 | grics
I need a sanity check... What are people on the forum using for board labels in their lead free process? As most well know, polyester will not survive the heat of the Reflow at Pb Free temps. I am having trouble justifying the cost increase (appr
Electronics Forum | Wed Jul 29 03:32:57 EDT 2009 | dilogic
We recently started to use wave-soldering. As total newbies in that field, we got successful results most of the time. Howewer, this batch of PCB's had a lot of resdiue, as shown on the picture. Most of it is most likely flux, but on some areas even
Electronics Forum | Thu Aug 06 19:20:09 EDT 2009 | boloxis
easy, just dip the ICs on a very weak solution of Nitric Acid, by very weak I mean like drops of Fuming Nitric acid in a half full DI water beaker. Place the beaker on a Ultrasonic bath and dip/shake the ICs in the solution in 5~ 10 seconds only. You
