Electronics Forum | Fri Mar 05 09:44:49 EST 1999 | Nancy Vandemark
Clarissa, Dave had good suggestions. We load several boards manual at this time. We set our components up in clearly marked bins. The documentation includes a chart with the part number, bin number, reference designator and color code for the par
Electronics Forum | Mon Mar 01 11:03:51 EST 1999 | Dennis Xiong
Hello! SMT professionals, I do not know if anyone posted this question before. Last week, I reflowed our newly designed thin Rigid-Flex pcb with 0.040" thickness. I found all of pins of a TQFP48 ic did not get wetted. I could see on the heel side o
Electronics Forum | Mon Mar 01 11:03:22 EST 1999 | Dennis Xiong
Hello! SMT professionals, I do not know if anyone posted this question before. Last week, I reflowed our newly designed thin Rigid-Flex pcb with 0.040" thickness. I found all of pins of a TQFP48 ic did not get wetted. I could see on the heel side o
Electronics Forum | Fri Feb 26 11:30:45 EST 1999 | Cunli
Dave, Appreciate your "troubling". As you know we welcome all suggestions and comments. And it indeed will take sometime before we get to evaluate these suggestions. Thanks. | Cunli: I think the phrases are worded accurately and don't think rewo
Electronics Forum | Sat Feb 20 09:56:22 EST 1999 | Tufty
| We are in the process of getting into no-clean paste and fluxes. One important issue in this is sodler balling. I have heard some people say that having a matte finish would help in having lesser solder balls and that the solder balls would not b
Electronics Forum | Thu Feb 18 17:49:28 EST 1999 | Ryan Jennens
Hey all- My question is this: My stencil printer operator has said that he has to wipe our 6-mil stencil each pass to get the paste in the 20-mill pitch aperatures for a QFP to release well. We are using Amtech NC-559 type 3 paste with 89.5% metal
Electronics Forum | Mon Feb 22 05:39:58 EST 1999 | Scott Davies
We are currently using circle, cross and double-cross(#) fiducial patterns with SiPlace equipment. Most of the problems seem to occur when, in the case of a HASL fiducial mark, a PCB is topside reflowed, goes away for thru-hole and comes back for bot
Electronics Forum | Sat Feb 13 07:57:42 EST 1999 | Kelly
| I am fairly new to the SMT game and I am getting conflicting answers to the following. Maybe someone can help me! When printing, one person is telling me that the stencil should be wiped completely clean of all paste because the quality of the
Electronics Forum | Thu Feb 04 09:22:56 EST 1999 | Terry Burnette
| Hello all, | | Are BGA's easy to develope shorts? If a process is stable and all of a sudden you get BGA's shorting out on you, what might be problems? | | We've checked our solder paste amount, and we've rechecked our reflow profiles and nothin
Electronics Forum | Tue Jan 12 19:49:28 EST 1999 | Ross Berntson
| Hi Folks. Has any Process Engineer here done a complete evaluation or controlled experiment for VOC-FREE Flux? Our goal here at CEBUKid, Inc. is to implement a VOC-FREE process. We have all the necessary (OPTIFLUX) spray equipment, and we're cur
