Electronics Forum | Thu Jan 04 08:33:08 EST 2007 | davef
You cannot determine foil thickness from its weight per area, because of the significant variation in the density of electrodeposited [ED] copper. But people don't care. They do it regardless. (oz/ft2)||(mils)||(mm) 1/2||0.7||17.8 1||1.4||35.6 2||2
Electronics Forum | Thu Jan 11 00:52:12 EST 2007 | behrsam
Mario, I tried a couple of profiles. In all cases the preheat ramps fairly slow, while the reflow utilizes the radiative heater to speed to reflow as quick as possible. I tried a quick profile and a slower one. The quick has about 15-20 sec at pre
Electronics Forum | Wed Jan 17 09:32:09 EST 2007 | Jeff
Hi, I am having problems reworking a lead free PBGA (23mm x 23mm, 1mm pitch). The board is relatively small (5" X 4" X 0.063"). During the removal stage, a thermocouple was placed at the solder ball level (between the board and underneath of compo
Electronics Forum | Thu Feb 08 13:22:36 EST 2007 | smtstaff
SMTnet is looking for your input on a problem that has started to become serious... You may have noticed that the forum has had some spam posted... in the past serveral weeks in fact several hundred have been posted. We are soliciting your views a
Electronics Forum | Thu Feb 08 13:23:32 EST 2007 | smtstaff
SMTnet is looking for your input on a problem that has started to become serious... You may have noticed that the forum has had some spam posted... in the past serveral weeks in fact several hundred have been posted. We are soliciting your views a
Electronics Forum | Mon Aug 25 15:40:58 EDT 2008 | dyoungquist
I am seeing poor quality solder joints, mostly on 0402 components. The problem is that while the pad on the pcb is getting fully wetted, the solder is not flowing up the sides of the 0402 component, i.e. the 0402 lead is somewhat de-wetting. The re
Electronics Forum | Fri Oct 17 22:36:35 EDT 2008 | arosario
Hi All, We just started build a new product and I am encountering many non-wet rejects in our new product. I need help on what should I look into to improve our Yield. Please see below back ground 1. We are using DEK Infinity as printer. 2. We are mo
Electronics Forum | Mon Mar 21 02:41:29 EDT 2011 | kemasta
Hi It's me again. Our products need to pass a chamber test 45c/36hrs after the PCBA completed batch of functional tests and assemble in to case. We found 1 unit was functioning for 24hours in the chamber, but hang after that. We tried to re-boot the
Electronics Forum | Thu May 17 09:01:01 EDT 2012 | scottp
I'm not sure why anyone would pay extra for FG (fine grain) stencils. I've run studies comparing traditional YAG laser, fiber laser, and E-form stencils with regular stainless, FG, and nickel foils. YAG is the worse and should only be used for pret
Electronics Forum | Wed Sep 11 18:01:27 EDT 2013 | huske
I've had that issue before, here's how you fix it, or at least it worked for me. Also assuming you didn't destroy a shaft, which should be obvious. Follow the flexible vacuum tubes to the top of the hydra shafts, you should see a red light below the
