Electronics Forum | Sun Jun 30 20:46:20 EDT 2013 | kumar_antom
HI there, I am having problem on the solderability for the fine pitch lead on SD card holder on this pcb.Have tried different kind of temperature settings on the reflow but the problem still occurred.Pls refer to the attached pictures.And when i jus
Electronics Forum | Mon Jul 01 19:43:44 EDT 2013 | kumar_antom
Hi there, Its a lead free process and the paste that we're using is with this alloy composition : Sn,Ag,Cu,Bi,In.... Pls refer to the attached temp.profile.... This is a mirror Pcb....Same components on both A and B side.... A side doesn't have t
Electronics Forum | Fri Feb 21 07:14:59 EST 2020 | bk
I would always have top and bottom preheaters in a solderwave machine. Even if you can make it work without them, it's better to heat both sides of a board then just one. Far less stress on the parts you are soldering. Plus you may need it one day fo
Electronics Forum | Wed Oct 31 12:24:21 EST 2001 | Stephen Zhou
We are designing the SM fixture for small PCB, does anybody know where we can get the spring holder which can hold the PCB to the fixture? Who is the manufacture for this part? Thanks in advance. Stephen
Electronics Forum | Wed Apr 09 03:21:36 EDT 2008 | fnorradd
Hi Steve, The adjustable workboard holders are a mixture of universal and aftermarket, they do not use the clamp down arms which were originally with the universal pbs holders, they are the type which have two grub screws holding the clamps to the h
Electronics Forum | Tue Apr 08 04:40:43 EDT 2008 | fnorradd
Hi, just wonder if anyone has any recommendations of where i can find spare parts for the adjustable PCB workboard holders ie, clamps, support arms and spring loaded supports etc. Basically looking for everything apart from main plate. Any details
Electronics Forum | Wed Apr 23 19:00:39 EDT 2008 | stevek
It depends on the laminate but a PWB is like any other MSL component. Some fab shops are only waranting standard FR4 laminates for 45-60 days when processed at lead free temperatures. The best thing I can say is to try some weight gain/loss experim
Electronics Forum | Tue Aug 28 08:28:30 EDT 2012 | rgduval
We agree with all of the previous comments, and would add the following: Warpage is generally caused by excess moisture in the raw boards. Have you tried baking the boards prior to assembly? We had this issue on a simple 4-layer board, and found t
Electronics Forum | Tue Oct 14 19:11:44 EDT 2014 | caurbach
We have a 6622CC machine for SnPb boards. A few things you may want to try: - Solderability testing on the components/PCB. - If the fuse holders or copper in the board are sucking up all the heat, try increasing preheat. Some fluxes (like the WS f
Electronics Forum | Sat Jun 24 10:10:31 EDT 2017 | fugtussey
Here's a good IR preheater that you should look at: www.paceworldwide.com/products/smt-rework-systems-and-preheaters/preheaters/ph-100-low-profile-pcb-preheater
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