Electronics Forum | Sat Aug 18 08:40:34 EDT 2007 | davef
Here's how to double reflow your QFP: * Reflow the first side with the QFP according to plan. * Paste second side and place components according to plan. * Lightly crinkle a small, QFP-size piece of aluminum foil. [Note: the degree of crinklization
Electronics Forum | Fri Jul 06 10:35:32 EDT 2012 | ashworth14
All i used to do was blow them with an airline to remove the excess moisture then bake them for 15/20 min at 100' in an oven and that seems to work fine, i did get the info from a 4 stage cleaning guide for the actual cleaning solution we used but it
Electronics Forum | Fri Mar 23 14:43:19 EDT 2018 | dleeper
What sort of components are missing? One possibility is moisture sensitive parts outgassing during reflow. The jets of steam propel the parts off the PCBA. Another thing to look at is your convection oven fan speeds. On some ovens this is adjustabl
Electronics Forum | Wed Feb 23 15:24:24 EST 2000 | Michael Uganecz
Steve, Give MPM/Speedline a call and see if they still sell the SPM-AV, it's a shuttle style printer with vision alignment. It has a really nice auto-align vision system that will move the table in x,y and theta. It's not a look up/look down syste
Electronics Forum | Wed Feb 23 15:24:24 EST 2000 | Michael Uganecz
Steve, Give MPM/Speedline a call and see if they still sell the SPM-AV, it's a shuttle style printer with vision alignment. It has a really nice auto-align vision system that will move the table in x,y and theta. It's not a look up/look down syste
Electronics Forum | Thu Jul 05 21:07:09 EDT 2012 | davef
Probably they had a problem with a certain product, tried baking, the problem went away and ever since there stuck with this money loosing process. So, ... * Write up a plan to split a couple of batches, bake a portion of each batch, don't bake the o
Electronics Forum | Thu Mar 22 20:56:50 EDT 2018 | jacobidiego
Hi experts, I have some multiple and randomly missing components after reflow. PADs are seen in AOI as if the component was never there. I have seen no evidence of the chipmounters missing any components at all while populating the board. We don't ha
Electronics Forum | Fri Mar 23 03:18:08 EDT 2018 | bukas
hello Diego, I would start by opening oven and looking for missing components. once you locate them you can work from there. are you using any alu caps on your board? I had problem with bad alu caps exploding in oven and scattering other components.
Electronics Forum | Tue Mar 27 01:52:23 EDT 2018 | buckcho
Hello Diego, are the components missing on the first side or the second side. Like Mr. Evtimov said, you can check before the oven the pcbs's visually and see what happens after the oven. In this way you can see if it is the oven for sure. Then there
Electronics Forum | Wed Sep 23 13:44:57 EDT 2020 | emeto
Hello SMT bear, 1. Is the embossed tape the correct tape for the component? Sometimes packaging services might use wrong tape if part was sent for tape and reel. CAn you tell us what package the component is? What tape is it packaged in? 2. Feeders
