Electronics Forum | Tue Jun 07 12:07:30 EDT 2016 | wlsmt
Sorry davef. I was not being clear. PCBAs came out cold soldered after being reflowed the first time with ALPHA WS-820. The flux gel ALPHA WS 609 was supposed to be applied only onto the terminations of caps where ALPHA WS-820 was for a second refl
Electronics Forum | Tue Jun 07 10:24:59 EDT 2016 | davef
wlsmt: You’ve got to help us out here: * Why did you apply solder paste to capacitors prior to water washing the PCBA [where the caps were attached?]? * Did you reflow the Alpha WS-609? * How is the Alpha WS-820 involved in this? * Talk about the
Electronics Forum | Mon Jun 06 12:51:17 EDT 2016 | wlsmt
My operator applied flux gel ALPHA WS-609 on MG P/N FTH101XAP (CAP ALUM 100UF 50V 20% SMD) before aqueous washing the PCBAs. Solder paste used was ALPHA WS-820. Now the caps have yellow stains. Any solution to this is appreciated. Tks
Electronics Forum | Tue Jun 07 21:10:53 EDT 2016 | deanm
The first thing I would do is give Alpha a call and talk to their tech support about it.
Electronics Forum | Wed Jun 15 10:38:41 EDT 2016 | laynefelix
Hi everyone..i am new here. I am hardware design engineer and as per my experience PCBAs came out cold soldered after being reflowed the first time with ALPHA WS-820. The flux gel ALPHA WS 609 was supposed to be applied only onto the terminations of
Electronics Forum | Sat Aug 25 08:39:15 EDT 2007 | gsala
If plastic Carrier Tape (CT)/ emboss tape, is made by: a)Polycarbonate material, it can withstand temperature around 120C� or may be more mantaining original dimension. b)Polystirene material, at max 45�C-50C� the CT starts to change dimensions and
Electronics Forum | Wed Dec 03 08:39:09 EST 2008 | sys_steven
boards are polyimide, and it is an ipa rinse with the solvent cleaner.
Electronics Forum | Wed Dec 03 07:30:57 EST 2008 | realchunks
Hi System Steve, What is a solvent cleaner over water wash? Solvent first and then rinse with water? And why do they feel the need to bake the boards? Do they think trapped moisture will cause board damage?
Electronics Forum | Mon Dec 08 18:25:35 EST 2008 | yuepingwu
Hi Bob, Do you have information about IPC D-35 for reference? What moisture sensitive level is the Sn-Pb/RoHS of PWB? Does PWB supplier start to implement PWB drying packaging?
Electronics Forum | Tue Dec 02 18:10:39 EST 2008 | sys_steven
Need your opinion guys.. The old timers at the plant here feel that we should clean our board after Misprints withe the solvent cleaner over water wash. This is so they don't have to rebake the pcb for 24 hours before smt again. I don't believe th
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