Electronics Forum | Thu Jun 24 09:24:03 EDT 2004 | Rob
The smallest component we use is 0402. Solder paste is Kester 256. Printer is MPM Ultraprint 2000. Stencil is 6 mil. I didn't here anything bad (rework or whatnots) in terms of soldering of those components.
Electronics Forum | Thu Mar 30 07:44:19 EST 2006 | Chunks
UP 2000 is a good printer. Spares are normal - blades, stencil/board light bulbs, the over head flourecent, get new conveyor belts. Take the cover off the tactile sensor and make sure it's clean also. Other than that it should be a work horse.
Electronics Forum | Thu Sep 13 01:37:15 EDT 2007 | pavel_murtishev
Good morning, Overprint, i.e. make stencil openings for your LED larger. Add printer accuracy to aperture size so that paste would always cover the pad. BR, Pavel
Electronics Forum | Tue Jun 03 20:09:31 EDT 2008 | fastek
Look in your manual. There are also calibration stencils and boards necessary to calibrate DEK printers. Do you have them? If not I might have a set I would sell.
Electronics Forum | Tue Nov 09 23:32:11 EST 2010 | bising
Stencils are 5mils thickness, SS material. Printer is Accela.
Electronics Forum | Mon May 20 15:58:55 EDT 2013 | sevenzero
Did you try a thinner stencil? More pressure and speed in the printer? What size is the QFN? Maybe the aperture needs to have a + in the center?
Electronics Forum | Wed Sep 30 13:49:06 EDT 2020 | emeto
I would prefer wave for this parts, but if it not an option, cut 6-8mil stencil and double stroke it on the printer. All the rest is adding additional steps/labor/cost that is not worth it.
Electronics Forum | Mon Jan 19 20:01:11 EST 1998 | Steve Gregory
| We use no clean paste and sometimes experience | flux splattering which gives spot on gold fingers. | Need help in analize the cause. thx. Dominic, That is STILL a problem huh? It's a tough one to solve sometimes...especially when you have as
Electronics Forum | Wed May 05 06:30:40 EDT 2021 | jineshjpr
Do Proper underneath stencil cleaning. if the cleaning not effective, check Vaccuum section of the printer machine. Else change the Wipe roll. Trying out with other cleaning solvent (dedicated to stencil cleaner) also improve this issues.
Electronics Forum | Tue Oct 03 11:07:00 EDT 2000 | C.K.
"In Reality there's no additional cost or extra cost for the cleaning time since there is no increase on operator's wage in doing the cleaning but instead just an additional load or job for the operators at the same wage cost." I'd have to agree...
