Electronics Forum | Mon Feb 12 11:12:16 EST 2007 | davef
Q1. After reflow some boards start producing bumps/bubbles which damage the internal layers causeing PCBs failed in Electrical-testing. How can I eradicate this problem from my assembling process? A1. Find a proper board supplier. Q2. If SMT compon
Electronics Forum | Mon Mar 26 22:42:20 EDT 2007 | sleech
The issue is of drying moisture-sensitive surface-mounted packages is likely to become even more of a baking-headache in light of the upcoming "D" revision to IPC/JEDEC 020. We have taken a simular approach that a major cellular phone firm took in
Electronics Forum | Mon Mar 26 22:57:28 EDT 2007 | sleech
Paul: You are dead-on! Desiccant and nitrogen cabinets are a great way to maintain the current moisture content level of a MSD package. But if you look at the 40 degree C schedule (Table 4-1) in J-Std-003B, you will find that the drying capability o
Electronics Forum | Tue Mar 13 06:50:57 EDT 2007 | realchunks
Hi Narksh, Well, for a quick over view, I'd suggest conveyors between all your equipment too. Also board handling equipment like bare board loader, buffers, shuttles... It really depends on how focused you want to get. When choosing any part of
Electronics Forum | Wed Apr 18 09:16:51 EDT 2007 | Cecil
We currently have an assembly that we have to mask the surface of several (24)SMT components where thermal compound is applied at a latter operation. These component packages vary from BGA's to QFP's. After the thermal compound is applied the PWA is
Electronics Forum | Thu Apr 26 09:05:16 EDT 2007 | realchunks
Hi D0m0 Can you standardize on your temps and just adjust conveyor speeds for various sizes of the boards? Another trick is to parallel t-couple plug off the actual t-couples of the oven and mount the plug in an easy access point of the oven. The
Electronics Forum | Fri May 25 13:38:15 EDT 2007 | mfgengr
TAL Too Long - dull solder joints, dewetting. TAL Too Short - cold solder, insufficient wetting. You want TAL to be as short as possible (but not lower than 30 seconds), but long enough for every solder joint to be above TAL for at least 30 seconds.
Electronics Forum | Wed May 16 11:40:11 EDT 2007 | stepheniii
I test pdb-boards on the mat it ain't work! Wrong > mount of bolts being outputted. is have something > to do witfh the rohas soulder on them? I will take a stab at translating. I test PCBs on a static mat but the test does not work. The output
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 | Thu Aug 02 11:46:22 EDT 2007 | realchunks
Congrats Shrek - sounds like you found your heaven, blaming others. About "IT". Wow, what kind of hype was that? I thought this would be something worth reading. Looks like a first year Project Manager thought of this. I agree, who ever thought
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