Electronics Forum | Wed Mar 30 16:52:41 EST 2005 | chunks
Someone sells the T-couples that are in a rigid tube and the base attaches to the edge of the bord. They have an adjustment nut on em you can adjust to spring load the T-couple on the are you need. They do produce a wavey profile from the part expa
Electronics Forum | Thu Apr 14 18:51:19 EDT 2005 | KEN
What side is the short occuring on. Topside or bottom (solder) side? 2. Pitch of hole pattern = ? 3. Your x-ray may not have the resolution or DSP capable of detecting this defect. How does your profile look? Is this a true short or the result
Electronics Forum | Thu May 05 17:15:46 EDT 2005 | russ
You got what I think someone has called a "cold melt". If you were to run your removal profile awhile longer you would not see this. Anyway, you don't have any issues as this is very common (at least in my experience). FYI I was thinking your oxid
Electronics Forum | Tue May 10 09:42:40 EDT 2005 | tforbes
We are using a water soluable process, and we have no fear of washing the boards after the crystals have been placed. Any type of SMT crystal I have reflowed with no fear, thats why this practice troubles me, and I want to remove it altogether. I w
Electronics Forum | Thu May 19 12:38:38 EDT 2005 | Brenda Robinson, SPHR
Hello. I am an HR Manager looking to benchmark pay rates for engineers in the Midwest with experience in reverse engineering and component level repair experience. The experience should be in BGA type repair with the core experience in setting thermo
Electronics Forum | Wed May 25 22:36:17 EDT 2005 | KEN
...just placed 100 xilinx 1681. These have the integrated heat sinks and bubba these need a lot of heat. You end up with 0402's on the very end of the board that get very hot (225-230) just so you can get the xilinx up to 215C at the balls.
Electronics Forum | Fri Jun 03 14:55:15 EDT 2005 | Bman
Both our Quad ZCR and our Conceptronic HVN-102 ovens have had blowers out with no alarms raised. We knew there were problems based on how boards were soldering, but don't count on your oven to tell you if anything is wrong with it. We verify once a
Electronics Forum | Sat Jun 11 07:24:26 EDT 2005 | buchi79
Russ, Thanks.By the way, i already look into the reflow profile & paste storage & thowing requirement. Even i cut down the stencil life to 4 hr to avoid any moisture absorbtion. If i were to change the paste formulation, what would you propose ? But
Electronics Forum | Tue Jun 21 07:39:23 EDT 2005 | davef
There's a fair amount of material on cooling rates for lead free on the web. Look here: * http://www.speedlinetech.com/docs/Cooling-Slopes-Lead-Free-Reflow.pdf * http://www.findarticles.com/p/articles/mi_qa3776/is_200412/ai_n9473486 * http://www.m
Electronics Forum | Tue Jun 21 16:54:37 EDT 2005 | slthomas
I'm inclined to believe along with others that if you don't smell it, and the flow rate is consistent (hence, your profiles aren't suffering from fluctuations in temperature due to fluctuations in circulation) you're probably OK. It does beg the que
