Electronics Forum | Wed Aug 21 10:26:08 EDT 2002 | stownsend
We are using OSP coated boards and no-clean solder paste. In a few instances, we are seeing increased distortion in an audio circuit. Has anybody seen or heard of surface insulation resistance (SIR) decreasing after reflow on OSP boards? Is it possib
Electronics Forum | Thu Jan 30 14:37:45 EST 2003 | davef
NASA-STD-8739.1 , Workmanship Standard for Staking and Conformal Coating of Printed Wiring Boards and Electronic Assemblies, says words to the effect of : 10.1 Purpose Conformal coatings are intended to provide electrical insulation and environmental
Electronics Forum | Mon Sep 06 04:42:18 EDT 2004 | KenF
Thx for the replies. Acutally I am doing a process related study to see whether the process (pcb depanelling)can induce crack to an MLCC. After depanelling, I will do a thermal shock on the MLCC based on IEC 384-1, that is, five cycles of 30min at hi
Electronics Forum | Mon Mar 07 08:53:59 EST 2005 | Marc
some thoughts come to mind..... usually an air pocket as the solder heats up, or the surface is still solid and liquid under, pressure builds and then... check your heaters, make sure one (or more) is not bad, may be getting uneven heating. cover y
Electronics Forum | Thu Mar 10 10:06:08 EST 2005 | steve
OK all you Gurus here's one for ya. Customer is tinning wires with standard eutectic solder in a solder pot. There is a blue tint to the solder in the pot. After tinning with OA flux, which I will change to NC shortly, he has clear teflon insulation
Electronics Forum | Mon May 09 17:49:28 EDT 2005 | chon
Inspect the cables specially in those area where cables have bendings with the motor motion. If they have something covering them or extra insulation try to remove it and inspect closely. If the machine runs and suddenly stops with this error and aft
Electronics Forum | Tue May 10 10:30:57 EDT 2005 | HOSS
One failure mode we have seen with TH XTALs is shorting from one of the leads to the metal can that houses the part. Typically, the opening around the lead at the base of the part can be small and if you combine this with a larger than needed annula
Electronics Forum | Thu May 12 07:27:51 EDT 2005 | Frank56
Hi Amejia, Do you can try my silly idea by using some connector header with plastic holder type cut and preparation by number of pin same as number of hole you want to mask and insert thru the pcb hole before you coat or may be you can use some type
Electronics Forum | Wed Aug 10 17:19:24 EDT 2005 | Steve Stach
The propensity for flux residues to cause shorts can be increased in humid environments where water molecules hydrate the surfaces. At high frequencies, electrons travel on the surface of conductors/insulators, increasing the likelihood of shorts in
Electronics Forum | Fri Nov 11 04:06:46 EST 2005 | arnold
we are manufacturer of molded type transformer. we have a trim and form process and its damage the pins of our units. the TIN insulation was being damage so we decide to immediately solder (wave soldering) the units to avoid oxidation. my question is
