Electronics Forum | Thu Jul 01 15:12:16 EDT 2010 | siddharth
Thanks to all for their inputs. @Hexielectronics, I am now trying to assemble the board by attaching it to a frame and removing the frame while waving it. I plan to put the boards back on the frame after the board cools down. Could you explain more
Electronics Forum | Thu Dec 04 09:49:11 EST 2008 | lazzara55
Dear Steven: Often the recommendations for baking prior to assembly are derived from various J-stds. But J's currently concern baking moisture out of components, and fail to address the moisture issues of the PCB. Because of that, there is the IPC D
Electronics Forum | Tue Jul 11 11:59:34 EDT 2000 | George English
Looking for some welcome advise again folks. We are currently using a reflow profiling software package which requires passing a data logging unit through the oven attached via thermocouples to a populated 'dummy' PCB. The problem is we have a very
Electronics Forum | Mon Jun 01 17:41:20 EDT 2009 | gregoryyork
What is your squeegee pressure and size. Also does the pad sit on a ground plane, as it looks like it is partially reflowed so surface has gone but not coallesced properly which would indicate it is more a problem with reflow above 217-219C OR obviou
Electronics Forum | Thu Sep 08 22:39:20 EDT 2016 | ttheis
Here's an idea; buy a pcb conveyor and design a simple label applicator to mount to it. Maybe replace the logic with your own or replace the PLC in the conveyor with your own solution. Shouldn't be much more than a few sensors and and a stepper motor
Electronics Forum | Wed Mar 04 10:36:10 EST 2009 | milroy
Hi If you mean your PCB stayed in the Reflow oven more than the reflow time required for the solder paste specs then I suggest to throw away the board because it would lead over heated solder joints all over the board. Think what could happen to an
Electronics Forum | Thu Oct 22 03:24:39 EDT 2009 | shinseimy
Base on my PCB experience, the contamination issue might caused by PCB finishing or SMT process (like oven or printing). Before go further, maybe you can check few things. How many PCB affected per lot?? it might be caused by humidity (storage or pac
Electronics Forum | Fri Dec 17 02:43:24 EST 2010 | grahamcooper22
Ideal storage conditions to stop pcbs absorbing moisture is at less then 5% RH, for example in sealed moisture barrier bags. You mention that storage was at 40~70%...at these levels the pcb will absorb quite a bit of moisture. Your baking time was no
Electronics Forum | Fri Dec 17 03:26:04 EST 2010 | kemasta
Thanks. If based on your statement, I can understand why it still can absorb moisture. But the PCB supplier was suggested us to keep at 40%~70% RH, if any issue occur with the storage condition of less than 5% RH, I think it is difficult for us to ge
Electronics Forum | Tue Nov 05 11:52:48 EST 2019 | rgduval
Richard, Are you trying to put different pcb's on the panel, or just step and repeating the same pcb across the panel? Either way, the method is pretty similar. For step and repeat, you need to create a panel/layout, using the panel fiducials. Th
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