Electronics Forum | Thu May 04 19:13:56 EDT 2023 | proceng1
This isn't always an option. We do a lot of very fine pitch and often will get a clogged aperture and have to wipe and print again. Also, as we are CM, some of our boards are customer supplied and they do not send any "test" boards.
Electronics Forum | Thu May 04 19:43:49 EDT 2023 | auriga2001
The idea is you test printing cycles with one board before thoroughly cleaning it. The board doesn't get thrown away. You just test print and wipe one board until you get a good print, then thoroughly clean that board. What would you use to clean a p
Electronics Forum | Fri Dec 15 10:58:32 EST 2006 | pms
Yes we see this also....... It is what they call "cold welding" of the solder paste to the blades...... The solder spheres actually "weld" together...... It leaves streaks on the stencil, not a clean wipe of the stencil....... We have never found
Electronics Forum | Thu May 04 13:42:47 EDT 2023 | wippsen
there is no reason to completely clean a circuit board. If you don't use a professional cleaning machine, you will always have leftover paste. Use a test board until the paste print is ok. You can wipe this off several times until the paste print is
Electronics Forum | Thu May 04 01:52:17 EDT 2023 | davef
Look at IPC-7526 - Stencil and Misprinted Board Cleaning Handbook, Misprinted Circuit Board CleaningCLEANING [ https://www.multi-circuit-boards.eu/fileadmin/user_upload/downloads/leiterplatten_design-hilfe/ipc-7526.pdf ] ITW/EAE says "Typically, th
Electronics Forum | Wed May 03 13:34:04 EDT 2023 | proceng1
When we get a bad print at SMT, the operator uses the alcohol wipes and wipes the paste off the board. Then they use compressed air and another wipe. In most cases this is sufficient. Most vias are tented, but there still remains some solder sphere
Electronics Forum | Mon Oct 05 08:52:20 EDT 2015 | Maz
Wondering what are the better cleaning agents out there in your opinion? Agents that are possible for triple cleaning (hand wiping, ultrasonic and solder printer's automatic clenaing). Can't seem to find one that is able to do all three task. Any re
Electronics Forum | Thu May 04 11:42:05 EDT 2023 | proceng1
I did some further reading yesterday and an ultra-sonic dip tank seems to be the recommendation, using a BGA cleaning solvent. I am not sure how such a process would affect the populated side of the board.
Electronics Forum | Thu May 04 11:37:25 EDT 2023 | proceng1
Thank you. I do feel that the document is very lacking in detail. It mostly says "yes, it needs cleaned. Make sure the cleaning process doesn't screw it up". The majority of boards that get wiped are already populated on the other side. So that lim
Electronics Forum | Mon Jun 19 17:00:39 EDT 2006 | a_laser
The most common rates of in-process cleaning (under wipe) I have encountered are once per 5 to 10 prints. But this depends a on a lot of variables. More often is typically better, but more costly in under-wipe materials. (For some more info see http:
