Electronics Forum | Thu Apr 23 07:51:45 EDT 2009 | scottp
Every paper I've seen published shows that BGA voids either have no effect or actually give a slight improvement. The one exception are voids with a root cause in bad incoming boards, such as champagne voiding where nearly the entire interface is go
Electronics Forum | Tue Apr 28 08:51:35 EDT 2009 | davef
This is a snip from an ealier post here on SMTnet. Generally, solder pastes are comprised of: 90% solder powder, 5% flux, 4% solvents, and 1% activators [by weight]. Where: * Solder powder, when reflowed, is a metal bonding agent that mechanically
Electronics Forum | Tue Apr 28 21:48:50 EDT 2009 | davef
Confirm the source of the issue. Run a coalescence test on both lots of paste. A simple coalescence test can quickly determine the condition of solder paste after prolonged use. Simply print a small disk [around 4-5mm diameter and 0.2mm thick - a bu
Electronics Forum | Tue Apr 28 22:22:45 EDT 2009 | davef
Eat correctly! Make sure you get your daily dose of fruits and veggies. Take your vitamins and bump up your vitamin C. Get plenty of exercise because exercise helps build your immune system. Walk for at least hour a day, go for a swim, take the stair
Electronics Forum | Wed Apr 29 10:08:52 EDT 2009 | wavemasterlarry
I like to cook my lunch thru the ovens on 2nd shift. just heat it up more than anything else - but it works. I think if you just get the right heat into the food it will kill the bacteria. Now I prefer convection over IR. Call me old fasioned, bu
Electronics Forum | Wed Apr 29 17:43:14 EDT 2009 | smt_guy
I have a Product with 2 Different PCB Fiducial allocation in the Design. It has 4 Fine Pitch components. The first PCB DO NOT have Fiducial Mark on the board itself BUT has Fiducial on the Break-OFF Tabs. The second PCB has no Break-Off Tab but has f
Electronics Forum | Thu Apr 30 08:33:42 EDT 2009 | kpm135
In regards to your panelized PCB it sounds like your step and repeat in you pnp program is slightly off, by 0.02mm from the sound of it. Are all of the components moving in the same direction as the fine pitched IC? I don't know what type of machin
Electronics Forum | Fri May 08 16:57:13 EDT 2009 | rmitchell
Hi, I have had similar issues. First as the above replies suggest pcb fids are better than panel scrap fids, even if you have to use fids under QFP's just palce those parts last. If your machine has board skip. Place 1-2 QFP's on pcb # 1 and check
Electronics Forum | Thu May 14 15:51:24 EDT 2009 | dnachristen
I've gone round and round on this very subject with our manufacturing engineer. He prefers to use panel fiducials and I prefer board fids. I've seen the result in placement from bowed PCB's in the machine. Skewing the board a fraction will throw off
Electronics Forum | Fri May 01 22:22:20 EDT 2009 | rodrigo
We didn't leave them swapted. They were placed in the original position until we got the replacement. What has me puzzled is that it worked for one panel correctly. I want to answer the other posts here too ... SA-6 is for Z2 The amp showing 7 is f
