Electronics Forum | Fri Jul 09 11:28:24 EDT 1999 | Earl Moon
| Has anybody successfully used an automated dispensing system to put solder paste dots on .5 mm pitch pads?? I need to replace some Meritec tsop sockets and I don't want to use the single site stencils for .5 mm parts. | Carol, Don't blame you f
Electronics Forum | Mon Aug 04 11:34:45 EDT 2014 | spoiltforchoice
Well our small UK based company is I guess in a similar situation, there isn't the volume or value to justify an expensive solution for fiddly rework tasks. But it would certainly be nice to have one and may become more important in future as people
Electronics Forum | Mon Apr 04 12:16:32 EDT 2005 | DasonC
We make a custom mini stencil to print the paste onto the QFN and flip over to load on the rework station. The mini-stencil was designed for SRT to pick up the QFN. Check BeamOn (stencil house) for detail. Good luck
Electronics Forum | Sat Jun 05 13:38:22 EDT 2021 | ppcbs
For Linear Tech LGA's we solder bump the LGA using a .30mm solder ball then reflow with a tacky flux. This will provide a void free solder joint and adds a little height to the solder joint in case you use a flux that you want to clean from under th
Electronics Forum | Mon Apr 04 08:35:08 EDT 2005 | py (france)
how to replace a qfn on a board , and how to weld it ? special stencil solder cream and as a BGA ?
Electronics Forum | Thu Nov 16 23:34:56 EST 2006 | mds33200
Hi, I am new in this industry and have purchased a beguinner unut, a 3-in-1 solder, desolder, hot air station. Currently I work on cellphone mainboards. At the moment I only replace single large chips on the mainboard. I would like to be able to repl
Electronics Forum | Fri Nov 17 14:42:06 EST 2006 | billwestiet
Mark, This is a big topic. Where are you located, it would probably be best to hook you up with someone in your area. Anyhow, lead or lead free should be based on whether the circuits are lead or lead free. I would guess that cell phones would all
Electronics Forum | Fri Apr 09 07:47:51 EDT 2010 | jdengler
Hi John, Our ERSA rework station came with a soldering iron that has a few special tips. We normally do not have a stencil and use tacky flux, so I use the concave tip to prep the pads. This leaves solder on the pads but with a little practice you
Electronics Forum | Fri Nov 17 15:12:26 EST 2006 | mds33200
Hi, I am located in Auburn Mass (USA) right near Worcester. Now I noticed you talked about micro stencil for a populated PCB, would I need one? Or could I use a syringe to lay a tiny dot of paste since im only replacing a chip or 2 (at the moment)? I
Electronics Forum | Fri Jun 04 11:54:22 EDT 2021 | cbart
We do this quote often with our older Summit machine. there are a few ways to do this. all of these are assuming you have parts on the boards already and are working around them. 1- if you have a good tech that can add solder to the pads on the PCB a
