Electronics Forum | Thu Feb 12 17:14:49 EST 2004 | Jim
Replying to mine own thread for clarification. We are having some issues with solder mask shifts on memory boards using fine pitch BGAs. At times the etch to etch distance does not leave room for a solder mask annular ring to be shifted or it will c
Electronics Forum | Thu Jun 10 18:18:13 EDT 2004 | ricardof
well, my concern is not the equipment, I know we could have the lines to do that, at this time not the required space, but what about the people? I mean, the machines are not 100% human beings independent, will the people support feeding, wiping, ins
Electronics Forum | Thu Jun 17 10:57:41 EDT 2004 | RicardoF
Believe me, I don't see any problem about optimization on Placement equipment nor printing or even the oven, my concerns are with the people: - Am I on the limit to assemble about 1100 to 1200 boards per shift (8 hours)? I have seen some of our lines
Electronics Forum | Fri Apr 15 11:16:03 EDT 2005 | HOSS
It's a longshot but.....I have seen low-standoff parts move caused by via's under the part erupting from within internal layers (outgassing). If this is a multilayer PCB and vias are not well plated or pourus, they can and will expand when heated.
Electronics Forum | Mon Jun 13 15:54:20 EDT 2005 | peter ng
Our technical side facing the printing shifted at the Sony SP750 Printer.It happened randomly exspecially when the printing X axis offset is more than 1.5mm.We using the Cad fiducial mark at our programme but the problem still remain.We need some ad
Electronics Forum | Mon Oct 31 08:29:51 EST 2005 | chunks
Shifting? Please describe the "Shifting". I.E. is it centering, sliding to cause shorts..... Most 208s will self center. If it's causing shorts, first check your print to make sure it is on the pads. Next check placement. Another area to check
Electronics Forum | Wed Jan 04 09:05:53 EST 2006 | stepheniii
Your process makes a bigger difference. What I have seen is ICT done early is better than AOI done more than a half shift later, and AOI done early is better than ICT done more than a half shift later. For high mix/low volume, I would go with AOI whi
Electronics Forum | Thu Jul 20 22:02:47 EDT 2006 | CKH
Hi Folk, i am wondering why they are Missing ELCap and ELCap being totally shifted out of the PCB Copper Pad during the SMT Reflow. Recently we have encountered some boards with the above mentioned symptoms. Appreciate if anyone could advise me. Th
Electronics Forum | Mon May 28 03:36:46 EDT 2007 | aj
Hi All, We have a QFP device that is struggling to achieve acceptable solder joints. I have noticed one or two of the components shifting during reflow. I can adjust the Blowers but I dont have any issues on other boards. This seems to be a straigh
Electronics Forum | Wed Aug 06 09:32:46 EDT 2008 | grics
We have a 3/6 Nozzle We do have monitors. One of our pots is leaded, the other is lead free. Our average wave height is ussually around 50%. Also, do you have any or found any benefits to removing nozzels at the end of your shift. I recall you say
