Electronics Forum: cons on pcb washing (Page 1 of 4)

Re: Ghost circuit shorts under smt resisters only when they are located on solder side of pcb (glued down)

Electronics Forum | Fri Jul 30 09:43:44 EDT 1999 | C.K.

| We are having a process related problem with pullup resistors on a controller card which has a I960 micro-processor. | The controller monitors signal inputs and it's own resources then blinks a LED to indicate its working. The problem is that after

Info on OSP PCB�s

Electronics Forum | Wed Apr 23 15:17:11 EDT 2003 | Robert

Let me see if I got this right. The OSP in un-plugged vias will break down after subsequent reflows and washes which can result in oxidation. Question: Is there any paper covering oxidation and reliability on such a condition. We are averaging .0007

Info on OSP PCB�s

Electronics Forum | Tue Jun 05 21:14:10 EDT 2001 | davef

You aren't going to post our stuff on your "Hey, I'm the wizard site", are you? Board fab, Pad coatings, OSP 1 OSPs: Imidazole (Via Systems) is good. Entek (Enthone) works, but requires strict thickness control in fab. 2 Enthone CU56 allows one t

Solder Spotting on Gold

Electronics Forum | Thu Aug 06 09:51:20 EDT 1998 | Bob Willis

This text may be of interest to any one with tin lead spots Guide to Solder Spots - A New Plague in Manufacture ? So what are solder spots ? They appear to be the next big problem in modern reflow assembly in fact in any process that involves solder

Latent shorts on QFN package

Electronics Forum | Fri Mar 06 10:32:34 EST 2009 | fountain42

Yes, We've already experienced this same problem. 1) What kind of flux are you using? No Clean? Rosin? OA? 2) If it's OA, What kind of water wash do you do? Do you use DI water? How Hot? Who's machine? What are the pressures? 3) Have you performed a

Differentdefect on circuit board surface

Electronics Forum | Fri Jul 10 07:34:00 EDT 2020 | elijah

From the poor bonding strength of the board, the surface quality problems of the board are divided into: 1. The cleanliness of the board surface; 2. The problem of micro graphite (or surface energy) on the surface. PCB circuit board proofing Youke bo

flux on PCB's after cleaning

Electronics Forum | Wed Jul 21 17:49:52 EDT 2004 | jsk

problem: Too many solvents and boards are not clean Flux remains on the board after vapor degreaser and "Powdery" white residue after vapor degreasing Flux type is kester 186 Process: hand solder High Temp alloy, spot clean after hand solder e

Re: White residue on PCB's

Electronics Forum | Wed Oct 11 10:29:28 EDT 2000 | G. English

Try the following steps : FIRST CHECK THE ARCHIVE for further information, it WILL help you. Step One : What�s the chemical analysis of this white res? Obtain a sample. It could be tin, rosin, or something else??? Step Two : The fastest way I know

White layer appearance on PCB

Electronics Forum | Thu Jan 28 14:10:57 EST 1999 | Tom B

Hello Netters, I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that the LPI solder mask

Re: haloing on SMT PCBs

Electronics Forum | Mon Jun 08 15:01:02 EDT 1998 | D.Lange

| I work QA at an OEM in Alberta, Canada. I saw earlier posts on the smtnet regarding PCB haloing criteria. I am currently in a dispute with my PCB vendor over the acceptability of haloing (delamination) around plated through holes and vias on a lot

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