Electronics Forum | Sat Dec 04 02:21:32 EST 1999 | Vinesh Gandhi
Hi All, I am facing a strange problem. One of my esteemed & valued customers has an unusual requirement of cleaning the board with IPA after soldering is complete. I am using alpha metals UP78 no clean sodler paste during reflow. This IPA cleanin
Electronics Forum | Tue Nov 30 12:02:02 EST 1999 | Steve
Hello All, We assemble boards which are small in size. We use nests for support when screen printing the boards. The nest gives support along the edges of the board. However we are bringing in a new product which has components very close to one edg
Electronics Forum | Wed Dec 08 18:11:22 EST 1999 | Dave F
sin: You're correct, there is no defect reduction program that's perfect, in fact nothing is perfect!!!! That's why people talk about 6 sigma and not 20 sigma!!!! If you had a perfectly controlled process, you'd still have defects due to random va
Electronics Forum | Wed Nov 24 11:38:42 EST 1999 | John Thorup
Hi Wade As Steve says - are you sure that the lead is in solution? Particulate lead like solder balls is much easier to remove. The answers are going to depend on total output in gallons, maximum flow required and what has to be removed. If you're
Electronics Forum | Fri Nov 19 11:07:17 EST 1999 | Bob Smith
Hi John, I don't know of any posters etc. but specs. are available free on-line at www.jedec.com for classification, time out of packaging before baking is required, bake times & temperatures. My understanding is that it only causes a problem if th
Electronics Forum | Wed Nov 17 09:02:57 EST 1999 | Dave F
John: The 180 Tg point is a sweet spot for obtaining heat resistance, cost effectivly. These high technology boards provide good thermal resistance for wire bonding, direct chip attach, and BGA mounting and rework. Since these boards are harder th
Electronics Forum | Tue Nov 30 23:00:11 EST 1999 | Ricky L. Price
Bill S. is correct on the positive effects of the Smartsonic 440-R SMT detergent. We have been using this in conjunction with a Smartsonic 4200-2D ultrasonic washer that is equipped with a tank heater set at 100'F. Our suggested process window to p
Electronics Forum | Fri Nov 12 10:20:53 EST 1999 | Wolfgang Busko
Now an than I hear, read about the same thing but without mentioning specific frequencies. It�s something that worries me in the back of my mind but not in actual daily workflow. Our boards go up to 50Mhz with digital bus systems and are made with no
Electronics Forum | Wed Nov 10 02:20:07 EST 1999 | Marc
The padsfor large heat sinks are being designed on our boards with large copper ground planes surrounding them by our engineers. I am having great difficulty keeping the reflow temperature below 230 degrees in order for the temperature of the copper
Electronics Forum | Tue Nov 09 05:14:49 EST 1999 | Wolfgang Busko
Hi all, our problem we face is the mismatch of conductor width on the delivered PCB and the nominal width given by CAD-data. With CAD we are improving pads and conductors to match the specific needs for soldering and the board houses counteract our i
.gif)
