Electronics Forum | Mon Mar 11 11:11:38 EST 2002 | slthomas
Tahnk you for posting the charts. > > They look > very useful, but I have a silly question: In > reflow problems _ What is "leaching" ? Dissolution of the component metallisation into the liquid solder. _ > What is "Halo effect" ? "...a
Electronics Forum | Fri Mar 08 11:44:00 EST 2002 | poirot
I manufacture industrial ink jet printers. I have a new application to join an unpopulated flex circuit to a light ly populated PCB. Production requirements are rather low. The area To join is 300 solder balls on the flex occupying an area of 5/8 i
Electronics Forum | Fri Apr 05 08:00:18 EST 2002 | Chris Lampron
Good Morning Everyone, It has recently come to my attention that components (PLCC's)are being placed in the sockets prior to wave soldering. Some of these components are MSD's. They have been overexposed to the atmospere, then are subjected to the w
Electronics Forum | Mon Apr 15 18:58:10 EDT 2002 | davef
Problems using NC in RF circuits are peculiar. Depending on the situation [ie, circuit layout, frequency of use, processes used, materials, and what not], a particular NC flux may not work with a RF circuit. Various NC fluxes leave different levels
Electronics Forum | Wed Jul 17 12:07:48 EDT 2002 | dragonslayr
DaveF is correct in directing you to the archives. This problem type has been discussed many times, it is quite common. Questions to ask yourself and provide us with answers are: It always happens or random? All assemblies or just one? solder paste
Electronics Forum | Thu Jul 25 05:56:32 EDT 2002 | ericchua
Hello, Understand you have problem of cleaning adhesives from Dek Pump Print stencil. Well, we have a cleaning machine which able to clean solder paste and adhesives. And also, we are not using any chemical but use water-base detergent. We had few c
Electronics Forum | Thu Aug 29 20:15:26 EDT 2002 | davef
That you are getting BIG gobs of solder on the pads indicates that your print / paste process is probably OK. Sounds like someone did something bad to the OSP. Tell us about: * Supplier and brand of OSP that your board fabricator used. * Number of
Electronics Forum | Wed Nov 06 05:13:01 EST 2002 | Dreamsniper
Crystalline flux if it is really clear should not be a problem. We were using Amtech paste before and we have the same results. Sometimes we mistakenly see it as a dry joint because of the reflections from the lighting of our Metcal inspection system
Electronics Forum | Thu Nov 07 09:56:26 EST 2002 | bpan
Thanks for the ideas guys. My QC inspector can take a pick and move the back part of the lead....even though the front of the lead is soldered enough to hold. There is SOME NOT ALL areas where there is no solder on the curved portion of the lead.The
Electronics Forum | Mon Dec 16 09:36:54 EST 2002 | russ
I have never had this problem. It sounds like you are right in imagining that there must have been a bad supplier of PCBS or an inadequate design rule being followed, or a very bad wave process to have this cracking over wave solder. Some books requ
