Electronics Forum | Mon Aug 23 14:09:56 EDT 2010 | davef
Similar to Coop's comments, above ... Bridging: * Mis-placement: misplaced components, high placement force mushrooms paste * Too much paste: HASL thickness, lead finish, poor underside support, poor underside wipe frequency, printing with too lar
Electronics Forum | Mon Jul 24 15:10:37 EDT 2006 | carln
Here are some additional comments that have been posted on the CircuitNet web site: Fist, the answer is the same regardless of the specific paste type, (leaded or non-leaded). High pressure sprays should never be applied to a stencil. Stencils are
Electronics Forum | Fri Oct 09 00:13:33 EDT 1998 | Pete Sorenson
| 2 Product reliability testing. Certainly you wouldn't shake your product to be shipped to customers, but running reliabilty tests, including shake and burn-in testing, are a good way to maintain the relaility of your product. We modified paint s
Electronics Forum | Mon Feb 19 13:04:17 EST 2001 | billschreiber
The ultrasonic frequency used in today�s stencil cleaners is usually a 40 kHz �sweep� frequency (also used on semiconductors and other sensitive cleaning applications). This frequency is not low enough to cause stencil damage (the lower the frequen
Electronics Forum | Wed Aug 23 16:18:47 EDT 2000 | Dr. Ning-Cheng Lee
I presume you are referring to vibration test with fixed frequency at room temperature. One procedure describing the detailed profile is in MIL-STD-883E, Method 2005.2 (12/31/96). The approximate profile can be described as 60Hz, 20-70g, and 96 hrs t
Electronics Forum | Tue May 20 12:35:45 EDT 2003 | Mike Konrad
This probably a reflow issue, not a cleaning issue. Although ultrasonic cleaners are not normally used in post-reflow applications (fear of internal wire bond damage), I have never heard of broken solder joints caused by an ultrasonic cleaning syst
Electronics Forum | Tue Aug 30 12:08:09 EDT 2005 | slthomas
The answer for us at my previous employer was water soluble flux. Wash the board, no residue. If you're not set up to wash (needing a washer, DI water source, waste treatment, ventilation, etc.) it can be expensive and space consuming. Do some resea
Electronics Forum | Fri Aug 11 16:19:39 EDT 2006 | T. Oaks
Hi, We have a issue with current leakage between pins on an SSOP 28 in a low frequency RF application and there is a suspicion that it is being caused by something in the flux residue. We have had the bad boards analyzed and a 'high' Chloride level w
Electronics Forum | Mon Jul 12 11:35:27 EDT 2004 | Pierre RICHARD
Here are some answers to my questions after a good research. I also added more definitions that could help understand this esoteric language used in assembly, specially surrounding fluxes and their use. In blue italics are comments and extracts from
Electronics Forum | Mon Aug 08 16:14:36 EDT 2011 | wmburke
We are building a plasma diagnostic to monitor MHD phenomena in tokamak. As part of the development, we need high-voltage, high-power RF capacitors to tune and match an inductive load. This application is similar to a small induction heater, with t
