Electronics Forum | Tue Sep 02 16:07:04 EDT 2008 | blnorman
Colorization is relatively uniform across the board. "Processing" is first pass reflow. I belive MacDermid is the ImmAg supplier. Plating thickness has not been determined, our XRF is being revitalized. Elemental analysis did show a large copper
Electronics Forum | Tue Sep 09 16:00:07 EDT 2008 | ppcbs
We always bake our loaded boards before any BGA rework is done. 12 to 16 hours at 100 c. We have had incidents in the past on loaded boards where 125 c has melted parts and the occasional low temp BGA trays. 100 c has proven safe for the past 10 y
Electronics Forum | Mon Sep 08 09:59:56 EDT 2008 | vladig
Here we go with another "solderability problem". How do you know the pads on the bare PCB are oxidized? Just based on its colour? If that is the root cause, then why ohter parts on the same board are fine? If you want to solve the problem, get it's
Electronics Forum | Mon Sep 08 10:34:37 EDT 2008 | blnorman
Because of our high volume production, we use no clean flux. We have experienced leakage currents with leadless QFNs. One problem is the part isn't being utilized as it should, but another is the flux residue. There is ionic residue in no-clean fl
Electronics Forum | Tue Sep 16 11:42:35 EDT 2008 | slthomas
If support is a concern, don't forget that any support provided by equipment manufacturers will most likely (certainly with Juki and Universal) require registration of the machines at a cost to you of probably $2k-$5k per machine. Some used equipment
Electronics Forum | Tue Sep 16 16:30:49 EDT 2008 | ck_the_flip
Vlad, yes, he made no mention of a BGA, but I thought I'd just throw it in there. Many people are concerned with the "backward compatible" scenario - running RoHS parts with a Sn/Pb solder paste. The scenario's a no-brainer with most components, bu
Electronics Forum | Thu Sep 25 16:30:44 EDT 2008 | aj
Hi, I would be interested to hear the outcome of your trials! Although, if mechanical stress is of concern, I would look at what is causing the stress and tackle that. I would suspect that any stress great enough to fracture sAC305 joint would do t
Electronics Forum | Thu Oct 16 14:12:36 EDT 2008 | evtimov
Hi, I think the standard was IPC 6850. But I will recommend to go directly with the sigma test. Place parts with the machine and measure the placement accuracy on another machine. 4-5sigma at 50um should be a good machine. If they have sigma in thei
Electronics Forum | Tue Oct 14 11:53:09 EDT 2008 | slthomas
How much cost do you absorb in touchup and replacing missing parts, and how does it compare to the cost of operating a reflow oven that runs whenever you have product available to process? I don't necessarily have an answer for you but I'm having a
Electronics Forum | Tue Oct 14 21:16:26 EDT 2008 | mariss
The mounted panels (8" by 8") are stacked in carriers, 0.5" between panels, 20 panels per carrier. There are no missing parts or other damage due to carelessness. Anyone bumping a panel is summarily executed by the company firing squad. As someone
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