Electronics Forum | Thu Feb 11 12:02:47 EST 2010 | plaiming
We have temporarily switched to an RTV for the vibration reincforcement, but it is not compatible with acrylic conformal coating and we really do not want to switch conformal coatings to a silicone based. Additionally we are testing the product in h
Electronics Forum | Thu Feb 18 15:25:13 EST 2010 | spitkis2
An air temperature tolerance of +/- 3 deg C along a 200mm width would not play a significant role on the board's temperature due to its thermal mass. However if the air temperature varies by 10C along the conveyers width, I can see how a 5 degree va
Electronics Forum | Fri Apr 09 20:47:36 EDT 2010 | 89jeong
I think the oxidation on the pad happens easily but do not on Au plated pad.The reason may be caused by improper cleaning or Au plating thickness in plating process. But,before suspecting the pcb board, you need to check your process or used material
Electronics Forum | Fri Aug 20 09:40:56 EDT 2010 | namruht
kpm, We were afraid of that, so we have tried several variations with paste usage. New paste, transfered paste from another line, and a new tube from another date code. I think the problem is profile, board design or humidity. I just have to starti
Electronics Forum | Sun Jan 20 17:55:49 EST 2013 | ngineer
Mikej, I'm only running a single image, just want to correct for the slight variations in how the board seats in the transport. It's not more than a few mils off, but enough to cause an issue on fine pitch parts. I don't have any image fiducial
Electronics Forum | Thu Aug 21 16:00:31 EDT 2014 | davef
This links to a NPL presentation on moisture removal from PCB http://www.npl.co.uk/upload/pdf/20140318_effect_baking.pdf Consider: * Focusing on preventing moisture contamination of boards, rather than removing moisture * There will be no standard
Electronics Forum | Tue Dec 02 06:07:00 EST 2014 | sarason
A trick I used to use doing RF design was to have on the edge of a panel, a stripline that I could hook up to a Network Analyser to check board impedance. You could do this to verify if the fault is in the no wash process or a board manufacture proce
Electronics Forum | Fri Aug 21 07:06:36 EDT 2015 | scotceltic
Thank you for the feedback. Yes we run many different products. We also have many different product variations that run the same PCB therefore the strong possibility if we have the wrong program loaded it will still run through the equipment. This
Electronics Forum | Wed Jul 06 06:17:11 EDT 2016 | pavel_murtishev
Dear members, Recently we have found that solder mask thickness variation could lead to solder balling under QFN packages for a high reliability device. Is there any industry proven method for solder mask thickness checking? Any equipment or any me
Electronics Forum | Sat Jul 23 09:19:17 EDT 2016 | dalpets
I want to place smd's by hand from tape strips using a vacuum pump. What is the orientation of polarised smd components on reels/tapes? Is there a standard manufacturing orientation, or are there variations? I understand some manufactures have part
