Electronics Forum | Thu Sep 27 19:52:28 EDT 2001 | davef
All of the discussion of "environmental controls" are a matter of degree, dependent on the requirements of the product that you manufacture. For example: shops assembling under-the-hood products have different requirements than shops making garage d
Electronics Forum | Wed Oct 10 20:35:17 EDT 2001 | djarvis
Stephen, I don't understand this at all mate. 1. If you don't place a QFP and get bridging across the bare pads, you were gonna get absolutely horrendous bridging if you did put one down. That points to poor printer set up or stencil design or both
Electronics Forum | Mon Oct 15 10:51:49 EDT 2001 | davef
On over printing, the general issues are: * Paste deposits being so large that when reflowing, collapse onto many, rather than a single solder mass. * Paste expanding during heating and being close to other solder deposits and bridging [as you say].
Electronics Forum | Tue Nov 13 19:52:47 EST 2001 | davef
1800??? That's not a Mictor part number. Huh? What??? Haaaa!!!! You gotta do what???? 1800 ofem??? Haaaa!!!! Sorry. It�s simple. Just ... * Cut all the SMT gull wing leads on both sides of the connector just above the solder. * Put the co
Electronics Forum | Thu Mar 07 15:38:34 EST 2002 | kg
I can point to at least one recent study with contrary evidence that 60% of SMT problems are printing problems. The study is published in the APEX 2002 conference proceedings, a joint effort between Aglient and Nokia entitled 'Paste Inspection Study
Electronics Forum | Thu Apr 11 20:35:22 EDT 2002 | davef
Messy. Messy. Messy. Consider gluing these components, until you control your process. It is unclear to us that a single factor drives these defects, but multiple factors that need to be tuned to work well together. PAD DIMENSIONS * Some SM-782 pa
Electronics Forum | Fri Apr 26 10:42:28 EDT 2002 | Jim M.
I worked for a telecom company that had sites in the deserts, jungles, mountains and regular built up area's. All boards were built using Aim 291/293 No clean solder paste. (all boards built to Bellcore standard) The boards were coated with Dymax ur
Electronics Forum | Mon Apr 29 22:32:59 EDT 2002 | davef
See, I didn�t bite on you zinc diffusion trick that you tried to pull last week. Understand, in this response, I am NOT trying to bust you. I�m trying to determine what you are looking to understand. [Some times I get so locked into talking a cert
Electronics Forum | Thu May 23 22:17:47 EDT 2002 | davef
Not intending to undercut Mike's offer, but to compliment it. Consider asking Heraeus for guidance about cleaning the residues from reflowing your paste. Some NC flux res: * Cannot be cleaned. * Can be cleaned after a relatively short period of tim
Electronics Forum | Thu May 30 13:46:00 EDT 2002 | davef
Consider NOT getting involved in those little POS chunks of sheet metal. * They're expensive. * You never have the one you need. * Even if you DO have the item you need, you probably will not be able to locate it. * It's all but impossible to c
A US manufacturer of quality hand tools for those engaged in the repair, rework, R & D, testing, and assembly of electronic components and printed circuit boards from Through Hole to 2Mil Pitch Surface Mount.
98 Elm St.
Portland, ME USA
Phone: 1-207-775-6139
