Electronics Forum | Fri Jun 29 10:56:56 EDT 2012 | jorge_quijano
Hi guys, I need your advise on this, I have a very uncommon PCB design (at least for me, I've never seen anything like this...) it is 32" x 18" x 0.062" and has 9 QFNs that are driving me crazy, I'm not able to get a good alignment, I can get a mediu
Electronics Forum | Tue Mar 13 17:26:07 EST 2001 | blair
1) We could press on BGAs and the boards would boot 2) This is basic boot up yield 3) We are now getting stpe by step inspection data going fwd. 4) So, Stencil design could be a critical factor. Any documented guidelines? 5) Yes DFX was done - mostl
Electronics Forum | Mon Apr 24 09:43:47 EDT 2006 | printerman
What you describe is the X snuggers fitted into the workholder which do need either a flat board or good vacuum to work. There are several solutions. One solution you can try yourself is to use Vacuum cups, ( bellows type) designed into the workholde
Electronics Forum | Tue Oct 27 09:57:37 EST 1998 | Dave
I completely agree with what Dave said previously about the trimming process. I spent the first 6 months at my current job removing this process from our assembly floor. We had several problems with the process including: 1) "flags" from the leads
Electronics Forum | Wed Jun 16 07:46:45 EDT 1999 | Glynn Technologies and Manufacturing
| We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centre
Electronics Forum | Sun Apr 03 10:07:40 EDT 2005 | davef
In 2001, IVF evaluated the reliability of IBM CBGA and CCGA, i.e. packages with "hard" balls and columns, in space applications for the European Space Agency. One clear result was that amount of solder paste printed on the solder lands is very critic
Electronics Forum | Mon Jun 14 09:23:57 EDT 1999 | C.K.
| We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centre
Electronics Forum | Mon Jun 14 15:59:16 EDT 1999 | JohnW
| We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centre
Electronics Forum | Thu Jun 17 10:25:43 EDT 1999 | Brian Wycoff
| | We are a medium sized PCB assy. house manufacturing about 2000 motherboards a day. There is a major problem we are facing at the wave soldering stage, i.e. warpage of the PCB. As soon as the PCB touches the wave it warps severely from the centr
Electronics Forum | Wed Feb 10 10:25:24 EST 2016 | capse
Akrometrix is a company here in Atlanta that measures surface topography at reflow temperatures for the PCB and component. They have software that overlays the two sets of data to look for warpage problems. They offers this as a service as well as se
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