Electronics Forum | Wed Mar 28 14:11:19 EDT 2007 | pjc
It should only be a visual thing. What may be happening is that all the thermal energy being driven into the wave solder pallet to get good soldering is causing the no-clean residues to burn up a bit, causing the discoloring. Check to see if they hav
Electronics Forum | Thu Mar 29 15:09:31 EDT 2007 | dphilbrick
We have Military and Medical companies that want us to track that so that if a particular unit fails we can determin if rework was the cause. Otherwise you are dealing with a QM that thinks they're real smart and your not! I suspect if you ask them w
Electronics Forum | Thu Mar 29 17:23:19 EDT 2007 | dphilbrick
All depends on the product. I say that because some stuff just isn't worth the effort, you other CM's know what I'm talking about. We do a review on every run after it is complete and there are many actions that can be taken. We always first focus on
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
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