Electronics Forum: pass (Page 75 of 142)

Re: SPC on stencil printer/ what's important?

Electronics Forum | Tue Jan 12 21:42:33 EST 1999 | Jon Medernach

What's important in stencil printing (which differs from screen printing) is providing a consistant volume of paste at each interconnect. The process window varies in proportion to the pitch. More than 60% of all defects are related to solder depos

Re: Simultaneous Double Sided Reflow

Electronics Forum | Tue Dec 29 10:36:38 EST 1998 | Earl Moon

I have been working on this process for a couple of weeks and I know that there are a few other companies in Europe and Japan who are also playing. Is there any one who has been running this process in production ? Yes I do mean reflowing

Re: Simultaneous Double Sided Reflow

Electronics Forum | Tue Dec 29 12:18:17 EST 1998 | Ryan Jennens

I have been working on this process for a couple of weeks and I know that there are a few other companies in Europe and Japan who are also playing. Is there any one who has been running this process in production ? Yes I do mean

Re: BOTTOM SIDE COMPONENT HOLDING DURING DOUBLE SIDE REFLOW

Electronics Forum | Wed May 06 19:51:46 EDT 1998 | D.Lange

Dear Freinds, DOES ANY ONE OF YOU WILL BE KIND ENOUGH TO GIVE SOME INPUT ON DOUBLE SIDE REFLOW OF COMPONENTS WHAT ABOUT BOTTOM SIDE COMPONENT HOLDING DURING 2ND SIDE REFLOW? ANY IDEA OTHER THAN USING SLDERPASTE WITH OFFSET MELTING POINT, EPOXY DI

Which side of PCB should be prefered for screening...

Electronics Forum | Tue Sep 18 16:48:55 EDT 2001 | jschake

Why do you think that assembling the BGA, QFP, and fine pitch parts will solve your bridging problem? I would think doing this may cause you more grief by having these more massive components being reflowed upside down fall off during the second pas

Flat Solderable Tin as a PWB solderable surface finish

Electronics Forum | Mon Nov 19 20:15:39 EST 2001 | davef

Now, that is one thickass board!!! The rant first: If our �board supplier changed our board surface finish on� anything without our approval, the board supplier would be an �X�. Life has enough surprises. And of all the flat finishes available, h

Filling via holes during the reflow process

Electronics Forum | Mon Mar 04 17:52:59 EST 2002 | davef

Yes, providing the surface of the via is solderable. * If so, how much paste? => Vias come in various sizes. Boards vary in thickness. So, the amount of paste to fill a via varies. Roughly, you�ll need twice as much paste as the volume of the via

omega meter

Electronics Forum | Wed Mar 06 21:16:17 EST 2002 | davef

�What does 5 micrograms of chloride mean to me?� * With SIR testing, you can show no detrimental leakage currents under humid conditions, no corrosion, no metal migration, which are the big factors in figuring out electrochemical reliability. People

Whitish Solder Joint

Electronics Forum | Fri Apr 04 09:28:59 EST 2003 | davef

Q1: Anyone has any ideas on how this post-SMT reflow solder joint could have changed to whitish joint? A1: Dunno. You need to tell us more. For instance: * What is the appearance of this white residue? [eg, glassy / coarse, milky colored / opaque,

Coatings to prevent water ingress

Electronics Forum | Sat May 24 21:49:24 EDT 2003 | ramanandkini

We have an electronic circuit with a miniature stepper motor, quartz crystal, Electrolytic capacitor,chip resistors and few smt LEDs. The PCB material is CEM1 with SMOBC and HALS finish. This circuit is assembled in a plastic casing and goes in to a


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