Electronics Forum: screen printing via test point (Page 1 of 6)

Re: Plastic Stencils for screen printing ahesive

Electronics Forum | Wed Apr 08 11:30:03 EDT 1998 | mpark

Clint, You may want to call KJ Marketing Services, a Canadian company that fabricates plastic laser cut stencil. They call it "Kepoch stencil" This material was originally developed by Dupont, and patented and marketed by KJ. It was available for

Re: Test the solder point

Electronics Forum | Thu Nov 18 10:56:16 EST 1999 | Dave F

Jacky: There�re major four factors that affect the reliability of a solder connection. 1 Design of the connection including the shape and height of the lead and the type and amount of solder. 2 Dissolution of base metals into the solder connection.

screen printer

Electronics Forum | Tue Mar 02 17:26:24 EST 2004 | pjc

I worked on MicroFlex. All axis move via electric motor drive. Carraige reapatability is +/- 0.0005" (12 micron). Cameras position more easily on linear bearings than the swivel type. The alignment accuracy and repeatability easily supports sub-20mil

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

solder pop out from via hole at secondary reflow

Electronics Forum | Mon Jul 08 11:53:40 EDT 2002 | yngwie

Hi Guys, We prints solder paste on via hole as the holes are used as the test points. This is a clean process. In normal production, upon completion of a primary side, board will proceed to secondary process immediately. The problem happened when

Re: Proflow of DEK screen printer

Electronics Forum | Wed Sep 08 08:25:26 EDT 1999 | Brad Kendall

Listed below are the issues Viking has been experiencing since the | installation of the Proflow Head: | 1. After installing new 350mm Wiper foil with metal | strip glued on it, It worked for about a week and suddenly meta

Re: Screen printing glue for wave soldering SMT components.

Electronics Forum | Fri May 26 05:54:40 EDT 2000 | Sal

For the past year now we have been printing adhesive with no real problems. Our printing ranges from 0603's to SOIC using a variation of aperture sizes and metal thickness foils. The crucial parameters are : aperture sizes : These obviously depend o

Re: DFM / DFT information

Electronics Forum | Thu Jul 13 22:20:38 EDT 2000 | Dave F

=10 mils larger than lead 3 silk screen legend text weight >=10 mils 4 pads >=15 mils larger than finished hole sizes 5 place through hole components on 50 mil grid 6 no silk screen legend text over vias (if vias not solder masked) or holes 7 so


Electronics Forum | Thu Mar 15 07:49:44 EST 2001 | jax

I am not sure if it is feasible in your situation becuase I don't know enough about your board ( mixed technology, single-sided, etc.... ) , but have you ever considered screen printing paste onto the test points?? JAX

Screen Printing Print Validation

Electronics Forum | Tue Nov 01 19:53:23 EST 2005 | KEN

Um...for you mylar guys....esd safe? Why worry about the first two prints. Worry if they power up or not when sent to funcitonal test. Zapp! I think I know where this is comming from. It is not that uncommon to have a sacrificial print. However,

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