Electronics Forum | Wed Dec 15 15:51:42 EST 1999 | cb
Tracy, Gary made some good points, you could also to check to see if you have the printer taking a long enough stroke over the board. I have seen some people not have the squeege come across the board enough and the paste roll is still setting over
Electronics Forum | Mon Dec 06 09:28:11 EST 1999 | Dave F
Glen: So that's this metal? Is it in the area of PTH or SMT solder connections? Etc, Etc. Assuming its near connections where pasted is reflowed ... Reflow defects, bridging: misplaced components, high placement force mushrooms paste, too much p
Electronics Forum | Mon Dec 06 09:16:22 EST 1999 | Dave F
Russ: Three things: 1 Wolfgang is 100% correctamundo about the slow dissolution rate of gold 2 Shear stength of the gold 63/37 solder connection decreases rapidly, as the gold content of the solder connection increases above 2%. 3 There are many
Electronics Forum | Tue Dec 07 22:05:19 EST 1999 | sin
Added to MARK suggestion, you should verify you xy table height also by using the meter listed in the maintenace manual. If everything is fine, then i suggest you should check the placement air kisses( can suck your component back up or release to q
Electronics Forum | Tue Nov 23 15:55:23 EST 1999 | Larry
Edgar, Check the Archives, there was someone else a while back who posed this type of question. I'm sure Dave F with his wealth of knowledgs will be able to tell you the thread name. Seems to me that the consensus was, that to enter this market you n
Electronics Forum | Fri Nov 19 10:56:03 EST 1999 | Kol Chokrotti
chem. Clean ->Electroless Cu ->Clean (hot air)->Electroplating->Inspection. We have checked chemicals, possible contamination and plating current requirements for that specific program�. Everything seems all right. Appreciate if someone could give
Electronics Forum | Mon Nov 15 13:38:35 EST 1999 | Dave F
Tuan: Many people develop spreadsheets to represent their processes and costs. Also, check out CostCoach at http://www.costcoach.com, it may be just what you need. It was developed by Phil Zarrow, Ron Lasky of MPM, Dr. Dan Baldwin of Georgia Tech a
Electronics Forum | Thu Nov 11 05:30:09 EST 1999 | Wolfgang Busko
For me it sounds like to much paste. If it worked in former runs with the same design and stencil look for changes in your printing process, check the volume and shape of your deposit. Redesigning pads and playing with aperture size allowing for mor
Electronics Forum | Wed Nov 10 11:31:06 EST 1999 | John Thorup
Hello Horace You're lucky in that you have two of the same machine. You should be able to arrive at the root of the problem by comparison. The problem is likely to occur in one or more of these areas: MACHINE: As said , pump speed and air contact ar
Electronics Forum | Wed Nov 10 11:52:50 EST 1999 | Wolfgang Busko
All good points to check. But consider that once you have dross in the pump mechanism it�s hard to get it out quick through normal operation. You might empty the pot and clean it sorrowly to get it out of all corners and parts where it sticks. I had
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