Electronics Forum | Fri Jun 15 12:12:34 EDT 2007 | realchunks
Hi Ed, It all depends on more info needed. How many preheaers do you have in your wave? One, two, three? Are you talking bottom side preheat? What size boards do you run and what type of parts are on it. Typically, preheat does several things; w
Electronics Forum | Thu Jun 21 12:20:29 EDT 2007 | rgirouard
Thanks for your input! Your ideas always help. The plan is to remove Captcha as part of the posting process for those members who have participated frequently. This will be in place next week. BTW, Dave can you give me any more info on Captcha no
Electronics Forum | Tue Jun 26 08:42:34 EDT 2007 | grantp
Hi, It's much better to add the cooler after the tank, as the tank will condense a lot of the water before it even hits the cooler and goes out. It's a much better system to have the tank between the compressor and then the cooler. The air also get
Electronics Forum | Fri Jul 13 16:52:24 EDT 2007 | jmelson
warning - not all stainless steels are non-magnetic! Quite a few alloys are magnetic, some as highly magnetic as ordinary steel. One quick test is to demagnetize the jaws. If you can find one of the old-style Weller soldering guns with the copper
Electronics Forum | Thu Jul 12 10:15:12 EDT 2007 | swag
I've got a proto build (3 boards) that has a Xilinx FG456 fine-pitch BGA on it. Every BGA pad on the PCB has an unmasked via attached. Between the via and the pad is a thin soldermask strip, maybe .005" wide at best. I am very confident it will br
Electronics Forum | Thu Jul 12 14:46:13 EDT 2007 | losersk8er
I'm new to the website so if I don't sound like I know what I'm talking about I probably don't. But I am having a great problem at work with conductive contamination that bridges two leads and shorts out the IC, causint costly repair. I have been t
Electronics Forum | Fri Jul 13 11:33:54 EDT 2007 | realchunks
Just starting and already responsible for product quality and machine adjustment? Wow, you poor bastard. Ok, I will assume this problem happens on the bottom side of the board with a thru-hole IC. The short occurs on the side that doesn't have the
Electronics Forum | Fri Jul 13 16:45:37 EDT 2007 | losersk8er
The Contamination has proven to be pretty random, lots of stainless steel though in fact two cases in the past two days. As far as I know all machinery is cleaned regularly as well, even the stencil washer itself. The boards we make are 90% (at l
Electronics Forum | Fri Jul 13 08:54:18 EDT 2007 | rgduval
Has your board house reviewed the PCB layer stack? Make sure that the layers are balanced in copper weight, etc? Have you tried pre-baking the boards? We just had an issue with some boards warping that have never warped before for us. It happened
Electronics Forum | Mon Jul 16 10:17:22 EDT 2007 | realchunks
Yes you can use no-lead parts in a leaded process. Your solder joints will be weaker than they once were unless you change your solder paste. You can try to improve this by running a hotter reflow temp, but be careful since your flux was not design
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