Electronics Forum: pcb and trace and blistering (Page 1 of 3)

seperation of soldermask and pcb

Electronics Forum | Tue Mar 25 11:25:18 EDT 2014 | horchak

The first impression I get is that the mask was applied over dirty or contaminated copper. What is the trace and land finish on the PCB? You also appear to have a wetting problem.

seperation of soldermask and pcb

Electronics Forum | Tue Mar 25 11:43:48 EDT 2014 | sara_pcb

It is Solder Mask on Bare copper, The land finish is HASL as per MIL-PRF-55110G which accepts trace of HASL as acceptable. Wetting is acceptable. regards, R.Saravanan

Desiccants and pcb finish degradation?

Electronics Forum | Tue May 15 21:57:06 EDT 2001 | davef

Welcome!!! Where the hay ya been??? Sorry bud, were lining-up with your fab [it hurts me to say that, but when yer  ] We used to dry pack with desiccants, also. Its probably an old MIL-STD-2073-1C requirement [er something like that]. We qui

Re: HAST and HALT

Electronics Forum | Sat Oct 24 06:07:09 EDT 1998 | Earl Moon

| Hi, | Am looking out for companies which would perform the "highly accelerated stress testing" for my PCB test assembly samples. does anybody have any info regarding this. | thanks, | subhash | Most independent PCB test labs, often doing military

Re: HAST and HALT

Electronics Forum | Mon Oct 26 14:56:07 EST 1998 | carl m

| | Hi, | | Am looking out for companies which would perform the "highly accelerated stress testing" for my PCB test assembly samples. does anybody have any info regarding this. | | thanks, | | subhash | | | Most independent PCB test labs, often do

Manual Pick and Place Manuals

Electronics Forum | Thu Sep 13 03:10:09 EDT 2012 | weyes

Optimize the pcb assembly layout can enhance the performance of the converter for switch-mode converters, excellent PCB layout is critical to the performance of the best system.If the pcb assembly layout is poorly designed, it may result in the fol

CSM-84 pick and place machine.

Electronics Forum | Wed Feb 16 19:55:34 EST 2011 | jeffr

There are three versions of the CSM84, old, older and really old. The older machines can only do fun things around the PCB if you toggle RUNMODE 1 from AUTO to be UTILITY... then you can use the utility program "PIC" to trace around the PCB or do min

paste Sn42/Bi58 and Lead Finish

Electronics Forum | Thu Nov 15 03:07:35 EST 2012 | nikyta

Thanks for your reply. As already said by Anvil1021, is not a good idea to mix Lead and Bismuth! Stay away from Bismuth if you have even the slightest traces of Lead on yours PCB, stencil, squeegee, spatula, blade, cleaning paper or cleaning cloths,

Block repeat and fiducial relation

Electronics Forum | Fri Aug 22 15:27:13 EDT 2008 | wayne123

this is the order that I use. 1. Teach pcb origin 2. Teach fiducial location 3. dial in vision on fid in mark info. 4. go into mount and verify that the primary image is on in x/y (after perfoming a teach trace condition) and then do any offsetts if

Reflow soldering problems and traces under component

Electronics Forum | Mon Jul 18 12:25:30 EDT 2016 | oleksz

Some people involved in PCB assembly process claim that SMD components reflow soldering problems are often caused by traces running under a component. According to this claim, trace (or any copper) covered by solder mask and placed under SMD componen

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