Electronics Forum | Mon Apr 14 16:21:58 EDT 2008 | ck_the_flip
Bottom-side SMT parts CAN and DO go liquidus during the 2nd reflow cycle. It could be that there was enough variability between the 2 different lot code PCBs to cause the parts to fall off. Remember wetting force determines surface tension (the abi
Electronics Forum | Thu May 01 10:51:09 EDT 2008 | realchunks
You need a paste designed specifically for this. They are available. Most have 2% silver in them and higher temp flux so you can reflow at "no-lead" temps. The silver aids in the intermaetalic bond and the high temp flux allows you to reflow the n
Electronics Forum | Fri May 02 16:20:35 EDT 2008 | rwyman
We've never, to my knowledge, sent out Pb-free BGAs to be reballed for use on an SnPb assembly. In fact, we developed an in-house reballing process and we haven't felt the need to do that either (for salvaging an occasional reworked part, maybe).
Electronics Forum | Sun May 04 20:11:53 EDT 2008 | marcelll
I'm working on a regular base with Advantis. There's nothing special regarding maintenance with the machine itself, only standard greasing & cleaning each 3-4 months. An hour or two maximum. If you have lightning head on it, it's maintenance free. I
Electronics Forum | Wed May 14 15:15:03 EDT 2008 | boardhouse
Hi Scott, I have worked for a State side PCB Manufacture and now a Taiwan Manufacture. At both shops the up charge was based on how many up the pallet array was plus layer count and complexity of product, charges ranged from free to 15%. Standa
Electronics Forum | Wed May 21 08:16:57 EDT 2008 | tonyamenson
Good morning gentlemen, I could use some advise as to the min / max windows for the wave process. We have had little problems with our leaded wave but when applying the same process to lead-free wave we are having problems. Obvisouly the temps are
Electronics Forum | Thu Jun 05 05:27:13 EDT 2008 | andy1975
Hi, I've been looking into UV cureable conformal coating and the UV ovens but a chemist I know is very negative about this. He suggest by heating standard conformal coating to 90deg for a couple of minutes will make the product good enough to handle
Electronics Forum | Sat Jun 21 23:15:07 EDT 2008 | mika
Also keep in mind that the CCGA column length tolerance is at minimum +/- 0.13mm from most part manufactures and they don't collapse in the same way as a BGA, therefore the paste height deposit could be critical in some rare circumstances. Board warp
Electronics Forum | Thu Jun 26 14:25:19 EDT 2008 | jax
Current Acceptable HMP Soldering Methods: 1. Wave / Selective Solder: Some Brands require upgrades to heating elements and Pot materials 2. Laser: Works well with PTH and medium/large passive SMT. Damage to PCB masking can occur when try
Electronics Forum | Wed Jul 16 19:01:44 EDT 2008 | boardhouse
Hi Mariss, The Main Problem with China is that they are constantly in training mode due to extreme turn over of employees. There are good shops their but you need to look hard. The Company I Sale for owns Two shops, 1 in Taiwan and 1 in china. We
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