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 | Wed Apr 29 10:05:05 EDT 2009 | wavemasterlarry
you have to lots of paste. one makes balls, one doesnt. Then why bake parts to over come bad paste? Sounds like the paste maker mixed the formula wrong on the one lot of paste. I used to work at a paste place and a lot of hand mixing is done at t
Electronics Forum | Fri May 15 13:17:18 EDT 2009 | tomsmiley
We implemented an inexpensive home dishwasher solution last year for cleaning assemblies. It works very well for both lead free and tin/lead cleaning. DI water at room temp is all we do and the boards come out squeaky clean. We had to use the least
Electronics Forum | Tue Sep 08 07:07:55 EDT 2009 | davef
We think the idea is to avoid boiling-off the moisture and let it 'cook-off' at a lower temperature to decrease the potential damage to components. If you heat a pan of water on the stove below, but close to the boiling point of water, the water in t
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 | Tue Oct 27 06:29:49 EDT 2009 | lococost
Yes it is possible, and yes you shouldn't trust boards that have this problem. You're best off baking PCB's this old befor reflow. This looks like barrel cracking, a quick google gives: http://www.eco3.co.uk/e3toolkit/e3toolkit/modules/05/05_04_j_pc
Electronics Forum | Sat Dec 19 16:54:43 EST 2009 | edmentzer
We use WSM-90 which is a red water wash off solder mask from Contronic Devices, Huntington Beach, CA, 714-897-2266. We bake the bare board at 150 F for 30 minutes after applying the mask. We run 130 to 140 F DI water in the inline cleaner which rem
Electronics Forum | Fri Mar 19 13:18:03 EDT 2010 | deanm
Regarding your question about buying equipment to vacuum seal the MBBs, according to the IPC/JEDEC standard, "Full air evacuation is not needed or recommended; light air evacuation will reduce the packaging bulk and enhance carton packing. Excessive
Electronics Forum | Tue May 04 09:45:05 EDT 2010 | dyoungquist
Only use the shop air if it is clean and dry. I know from experience that one can get water and a little oil from the compressor in the air lines. We are in a drier climate with humidity levels in the 25%-35% range on average. All we do is let the
Electronics Forum | Fri Jul 16 08:14:15 EDT 2010 | vetteboy86
We're expereincing issues in our pick and place machine due to what I consider a server warping of the PCB. The PCB is received this way from our PCB manufacturer. Before I push to much, I would like to know options for a cause. The warp is so bad,