Electronics Forum | Fri Mar 30 06:58:24 EDT 2007 | ck_the_flip
Alot of QM's and QE's are typically failed Engineers who lack common sense. They don't understand that measuring in DPMO's (versus DPU's) "normalizes" your data for Printed Circuit Board Assemblies (PCBA's) so that if you have 10 defects on a PCBA t
Electronics Forum | Thu Mar 29 08:41:29 EDT 2007 | george
Hello everybody, I had not noticed until yesterday this situation. Whenever the wave operator has a problem with a PCB (i.e. lifted parts, misprayed flux, etc.) they wave solder the PCB again "to fix it". The problem is that PCBs do not look pretty
Electronics Forum | Wed Apr 11 15:56:54 EDT 2007 | egrice
CECIL, I am sorry to hear that you had a bad experience with ERSA. However, one bad experience does not mean that ERSA is a bad company. On the smaller BGA Rework systems, sometimes the sales reps do the installations. Was this the case? If so,
Electronics Forum | Thu Mar 29 13:29:08 EDT 2007 | JD
Ewwww metal mini stencils? Try http://www.circuitmedic.com/products/stencils.shtml We use their flextac stencils all the time and they work perfect. You can get a couple uses out of each of them if youre careful too. Just line it up under a scope and
Electronics Forum | Fri Mar 30 11:56:08 EDT 2007 | JD
We have had issues with using the ones from Best. The holes are not always cut correctly and the edges (inside the holes) are not well defined because of the kapton material they use maybe. Plus you leave the mini stencil on the PCB under the BGA whi
Electronics Forum | Fri Apr 06 22:40:24 EDT 2007 | oldsmtdude
After thinking some more: Feeder offset is usually an averaged number... If feeders get erratic feeder offset goes wacky. Nozzles don't seal, components slip and vision isn't getting the true pick position. And worse they may move again post vision
Electronics Forum | Thu Mar 29 14:46:16 EDT 2007 | jmelson
Oh, I should have been more specific on microscopes. I have a Bausch & Lomb StereoZoom 5 and an old Olympus. They both work pretty well. I think the Olympus has a little better depth of field, but the B&L has better contrast. (Maybe the Olympus j
Electronics Forum | Fri Mar 30 08:46:53 EDT 2007 | electronhose
I just purchased some PACE ST-25 systems for basic soldering and they work great. It was a deal at $155 each and they heat up FAST! Tips are around $6 each so the whole system is affordable. A step up for rework jobs would be the Metcal MX systems.
Electronics Forum | Thu Mar 29 14:55:59 EDT 2007 | HOSS
Hello, I searched the forums and found little specific info on LGAs with interior lands. This is not a QFN with a center pad. This is a multi-row BGA without solderballs. I'm looking for recommendations on PCB land to part land ratio, stencil a
Electronics Forum | Fri Apr 06 08:45:48 EDT 2007 | davef
UNDERFILL The design of the component and the end-use environment drive the requirement fot underfill. Here is a good introduction: http://www.asymtek.com/news/articles/2002_globaltronics_csp_and_fcuf.pdf Google for more. We have no relationship, n