Electronics Forum | Thu Jan 14 15:22:14 EST 1999 | Earl Moon
| Steve, | Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my
Electronics Forum | Thu Jan 14 11:08:29 EST 1999 | Mike McMonagle
Steve, Whoa, take a breath! That was at least a dollar three-eighty answer. I've got to agree that nothing can replace a qualified, concientious operator for assuring quality. When I too worked at a small shop there in SillyCone Valley, my seni
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
Electronics Forum | Thu Mar 31 17:09:43 EDT 2011 | Mark
I would suggest doing an aperture reduction on your stencil or move to a thiner stencil.Please check that your housekeeping related to stencil cleaning is monitored.
Electronics Forum | Mon Nov 29 10:35:32 EST 1999 | Jason Birch
Gentlemen, Can anyone recommend a stencil cleaner manufacturer? Are there any advantages to using ultrasonic vs. high pressure? I am also looking to clean misprinted boards with the machine. Thanks, J. B.
Electronics Forum | Wed Feb 07 15:03:54 EST 2024 | madisreivik
Also, if you use etching pen, clean the surface first with solvent as grease blocks the etchant. Some rubbing with steel wool should also help.
Electronics Forum | Mon Sep 29 23:46:51 EDT 2003 | daman
Hello everybody, We have a new product having a lot of open gold area. solder splashes during the reflow is a pain in the... Its an extremely small PCB and kapton taping is not an option. Stencil is at 10% reduction, Cleaning after every cycle. Reflo
Electronics Forum | Thu Jul 17 04:42:47 EDT 2003 | sanjeevc
Hi! One technique: 1. Remove all balls 2.Make > a mask(stensil)for reballing.The holes of the > mask must be 0.8-0.9 the size of the pads. 3. > Reball chips 4. Reflow chips Good luck Hi Yes,we have done quite a bit of reballing of BGAs with
Electronics Forum | Thu Jul 20 05:04:30 EDT 2006 | bing007
We had a similar problem with gold contact pads. Cleanliness is paramount. If you are using foil tensioning system, wash the foil in a stencil wash before use as the cardboard cassettes may be contaminated. Be very careful when loading into a frame f
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