Electronics Forum | Sun Nov 01 01:33:52 EST 2009 | isd_jwendell
Just my opinion: Top pic - Solder mask registration WAY too far off, without a doubt I would reject. Bottom pic - I would worry that there was/is a contamination that caused the poor looking mask. This may be cosmetic only, but unknown. I would rej
Electronics Forum | Fri Nov 06 11:39:17 EST 2009 | 14367
As you know, the H1N1 virus is on the move, and we are trying to take precautions. We wish to use a 60% alcohol based lotion for disinfecting our hands. It has been questioned if the added substances could be detrimental to electronic assembly board
Electronics Forum | Fri Jan 29 21:31:46 EST 2010 | aqueous
I would recommend the following paper entitled "Cleaning for Reliability Post QFN Rework" by Mike Bixenman (Kyzen) and myself (Aqueous Technologies). While it discussed cleaning under QFN's in a batch environment, it is also applicable to cleaning u
Electronics Forum | Fri Feb 05 11:50:54 EST 2010 | baildl632
I just browsed this article and found no mention of cleaning with a "sonic" washer. We have a PMR Systems Ultrasonic Stencil Cleaner. The manual says it works well on cleaning PCB's for varoius reasons. It works excellent for removing lead. We can wa
Electronics Forum | Wed Feb 10 13:47:39 EST 2010 | davef
At a previous employer, we made a wearable medical device. When a customer finished using the device, she/he returned it to the company. Then, the company refurbished the device and rented it to other customers. Before it could be refurbished, it ne
Electronics Forum | Wed Mar 03 01:48:57 EST 2010 | 89jeong
Hello Sir. Our customer asked me why the solder did not cover the surface of the potocopuler lead. There are 2 ea of photocopuler on pcb and the leads are totally 8ea. But only one is showing this problem. When i reviewed the reflow profile, there
Electronics Forum | Wed Mar 10 16:19:34 EST 2010 | swag
We have one and it's awesome. No problems & training and install was great. The only problem we have had in a couple years is inconsistent nozzle fountain (lasted a day or two until we figured it out). It was our fault - an operator had mixed hand
Electronics Forum | Fri Mar 26 00:57:05 EDT 2010 | 89jeong
Hello Sir. We also have faced a same problem. At that time, we had to repair it because we could not find any solution. But in our experience, the void underneath FET was more severe whenever we used the FET that have been made long time ago. It is
Electronics Forum | Wed May 19 11:39:52 EDT 2010 | ccross
Over the last year we have seen a number of reworked and counterfeit parts coming in - particularly BGAs. This has been rather expected of some of our 'black market' sources but lately we have seen it from our larger, more respectable vendors as well
Electronics Forum | Mon Aug 09 12:46:59 EDT 2010 | ppcbs
Try tinning pads with a high pH water soluble flux like Kester 2331-ZX or Alpha Metals 3355-HB is what we use. It will remove the contamination quick;y without having to scrape with a blade. If you have a large number of bare boards you can run them
