Electronics Forum | Mon Dec 25 08:43:35 EST 2017 | arjunkolavara
Hi , We are having Pin hole issues on the passive locations in the board after the SMT reflow process. Details: PCB surface Finish : ENIG . Solder paste : Alpha OM338 – M13 / Indium SMQ92J Location : Its Random and more on passive components. {
Electronics Forum | Fri Feb 01 02:32:31 EST 2019 | robl
It's nice to be able to do things in house, and it's good to have somewhere without commercial pressures to learn and make mistakes, so I can understand where you are trying to go. Those machines look a little lightweight for consistent quality pr
Electronics Forum | Wed Aug 14 18:17:32 EDT 2019 | slthomas
We are down to the last few unresolved PCBA test failures in a work order and scrambling to get them repaired and into a mechanical assembly. What we have found in quite a few of these cases are cracked 1206 MLCCs. The failed parts are all the same
Electronics Forum | Thu Nov 12 12:13:21 EST 1998 | Bill Schreiber
No appologies necessary, it looks like wayne@att beat me to it! Seriously, there is an article in the current November issue of Circuits Assembly magazine: "Surface-Mount Stencil Cleaning" by Nick J. Lester. From talking to Mr. Lester, I know he ha
Electronics Forum | Thu Aug 03 19:49:16 EDT 2000 | Darby
I presume you have no vision alignment. Buy yourself a little monocular measuring microscope ( about $100 ). You are not going to get the registration you require between stencil and pcb for each print if you are running off tooling pins , edge clamp
Electronics Forum | Mon Jan 29 06:44:59 EST 2001 | Scott B
I have recently come across a device which has a palladium over nickel finish which when soldered shows evidence of poor wetting to the lead ( i.e. a wetting angle greater than 90�) about three quarters of the way up the side of lead. This is only vi
Electronics Forum | Wed Mar 14 17:52:49 EST 2001 | davef
6 Work Life Test 6.1 Obtain a stencil with 15 to 20 rows of a series of 0.025 by 0.050 inch apertures spaced 0.050, 0.040, 0.025, 0.015, 0.010, 0.010, 0.025, 0.040, 0.050 inches apart. See Appendix 1. Source of supply: Metal Etching Technology.
Electronics Forum | Wed May 09 17:26:57 EDT 2001 | davef
Awww, don beso tuff on ursef!!! It sounds like you�re thinking correctly with what you�ve done, but it�s possible that the test you ran did not represent your actual production environment as well as you would have liked. So, you just need to "cran
Electronics Forum | Wed Jun 20 09:19:14 EDT 2001 | Gil Zweig
Dave: Your question is very astute. First let me make the observation that x-ray imaging is a technology that not many people in electronic fabrication are familiar with (but some think they are); consequently they are gullable acceptors of sales dis
Electronics Forum | Mon Aug 30 16:10:10 EDT 1999 | Dave F
| I have looked through the IPC web page and surfed to frustration. Can somebody give me a lead? | Brian: We don't use an etched board. We use a special stencil, described below and print on bare copper laminate. 3 Solder Wetting Test. Recogniz
