Electronics Forum | Wed Jun 14 11:37:44 EDT 2006 | shawnvike
find the problem? Were the parts failing > electrically? Or did someone start prying them > and decide they were too weak? Originally found the problem going through some older assemblies that had failed testing. Poked at leads and found them no
Electronics Forum | Thu Oct 12 16:55:19 EDT 2006 | realchunks
This type of testing is only done to verify your reflow process. It is destructive testing and should not be performed on product reaching your customer. Solder is only used to provide the electrical connection from part to board. As a metal it is
Electronics Forum | Mon Jan 14 17:15:24 EST 2008 | jmelson
$200 is iffy, even for a used, reconditioned unit. I got an aged Olympus for about that some years ago, but had to make my own stand. There is a Chinese-made stereo microscope (no zoom) that is absolutely worthless for inspection, because the "thro
Electronics Forum | Fri Sep 25 08:09:46 EDT 2009 | markhoch
DudeBro, who peed in your oatmeal this morning? Relax, it's all good. Your anger is what me find it so funny. Excuse me for chiming in. I could've helped, but saw that he already had the information that he needed. As far as my inexperience goes..I'v
Electronics Forum | Mon Jan 18 10:49:22 EST 2010 | pcbrookie
Hello all, One of our resistor arrays is becoming detached from its balls after reflow. This is the second instance of this happening. The balls are clearly soldered to the board, but the actual package is coming off (package pads are quite bare).
Electronics Forum | Tue Aug 03 17:28:33 EDT 1999 | DLKearns
| | | I have been asked to supply a maximum shelf life for our assemblied PCB's. I realise this is dependent on so many factors- temperature, humidity, no of layers etc. But does anyone have a formulae for calculating shelf life, or does anyone know
Electronics Forum | Sun May 23 15:12:59 EDT 1999 | JohnW
| We are running a number of boards with 8-10 25 mil PQFPs on board. Our process is mature with at least 3 years experiance and statistically few opens on the QFPs. Our beloved purchasing department has chased the almighty $ and changed FAB vendor
Electronics Forum | Fri May 04 02:32:10 EDT 2007 | jmelson
Thanks! Well, the procedure in the book says to first calibrate the mech aligner with the beam sensor, but that exceeds the X travel. I guess you can just eyeball it off the nozzles and then use trial and error. While poking around on the machine
Electronics Forum | Tue Mar 31 12:35:29 EDT 2009 | tpappano
Hi Peter, I forgot to mention that the "locating pins" are on the front conveyor rail, and have conical points that poke partially into the holes in the pcb locking it into position. Also as part of the "locating" arrangement are two more slim pneu
Electronics Forum | Mon Oct 20 10:08:42 EDT 2014 | rgduval
Had someone in from the broker that we bought this machine from, and he did some poking around. We've learned some things, but, unfortunately, are still no closer to getting the machine running :( We discovered (based on double checking other machi
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