Electronics Forum | Fri Feb 21 00:15:04 EST 2003 | MA/NY DDave
Hi I see David F already gave you some good sources, most of which I recognize. There are or used to be somemore even in your neck of the woods so keep on checking. SMT Plus rings a bell in my head, and check the magazines on the web like Circuitry,
Electronics Forum | Tue Mar 18 17:13:47 EST 2003 | Carol Stirling
Hi -to all those familiar with MSL, I have a few questions on Moisture Sensitivity Levels (MSL) with ICs. We have been assured by our distributers they mark any package of ICs shipped according to J-STD-033. We receive ICs marked as Class 3 and up,
Electronics Forum | Thu Mar 20 16:59:10 EST 2003 | MA/NY DDave
Hi Read those guides again and then give IPC a call to see if they can direct you to any other materials. This stuff is quite old so they should have lots. The Mil does also. IPC does have a Designers Council that serves your area. Give the leaders
Electronics Forum | Thu Apr 17 16:43:09 EDT 2003 | davef
Background: * Bulwith, Ronald A., �Failure Analysis of Solder Joints�, �Insulation/Circuits� magazine, February 1978 * Banks, Donald R., et al., �The Effects of Solder Joint Voiding on Plastic Ball Grid Array Reliability�, Proceedings of the Technica
Electronics Forum | Wed Apr 30 03:44:45 EDT 2003 | chrissieneale
Lwei, Our boards are double sided and have BGA's on one side. We always run this side first so we can x-ray inspect the BGA's for short circuits, then run the second side. Depending on what industry you are in you may have some problems.. we work in
Electronics Forum | Wed Apr 30 14:35:35 EDT 2003 | clarkk
Hello all, We have received reports from two customers about electrical leakage on pcb assemblies that used Kester paste #HM531 (63/37) and washed with Kester 'Bio-kleen' saponifier and DI water. The leakage is such that when the boards receive power
Electronics Forum | Tue Jun 03 13:01:16 EDT 2003 | Ramanandkini
We have some experience in manual application of conformal coating using a brush that too for small circuits espceially on the soldered pads. We use Chase corporation's Humuseal 2A64. This passes high humidity tests. I am also in touch with Lackwere
Electronics Forum | Wed May 28 08:25:08 EDT 2003 | davef
That's what we do [no more than three reworks or mods]. Your "four reworks permissable" was probably based on the 55110 five thermal cycles, counting wave soldering as the first cycle. How do you plan to keep track of each of those rework actions?
Electronics Forum | Mon Oct 06 11:13:32 EDT 2003 | marmotzj
Dear All, I'm encountering a problem on mounting Intel E7501 and P64H2 FC-BGA chips. After the SMT process, these two BGAs were defected. Both had power-to-ground short circuits on the die package itself, and also the die resin had cracking tracks
Electronics Forum | Fri Nov 28 10:00:52 EST 2003 | Tom B
John, I typically specify no more than three repairs per PWB or assembly. Using the IPC 700/7711/7721 and Circuit Tech's Guidlines for reference. If PWB cost is only couple of $$ then repair may not be worth it (you do not want to make repair, the
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