Electronics Forum | Thu Mar 15 17:19:12 EST 2001 | mparker
Are the tin/lead ratios compatible betweem HASL and wave solder? Probably are, just a remote possibility. Flux application is? bubbler, sprayer? Either way, are you getting good misting, coverage on those teeny 0.5mm test points? If not, then no
Electronics Forum | Tue Mar 13 14:17:00 EST 2001 | blair
Thanks a lot for the response 1) there are 8 BGA on this board 6 PBGA, 1 TBGA and 1 ESBGA (metal lid). They are dispersed over the board (approx 11"* 14") 2) Is there a tool to use to understand pitch/bump size and stencil aperture (optimized)? 3) Y
Electronics Forum | Tue Mar 13 17:26:07 EST 2001 | blair
1) We could press on BGAs and the boards would boot 2) This is basic boot up yield 3) We are now getting stpe by step inspection data going fwd. 4) So, Stencil design could be a critical factor. Any documented guidelines? 5) Yes DFX was done - mostl
Electronics Forum | Mon Mar 19 21:25:13 EST 2001 | davef
The technique you describe is contrary to the approach we've taken to educating our folk and helping all to understand what's going on and being involved. Not sure how well that would play in Peroria. I'm looking for tools / techniques / what not t
Electronics Forum | Thu Mar 15 03:24:48 EST 2001 | Scott B
We are currently having a conflict of opinion with our QA department regarding the very few occurences we have of chip resistors being soldered upside down (i.e. the resistive element towards the board). IPC-A-610C para 12.3.2 specifies that this co
Electronics Forum | Fri Mar 23 11:58:01 EST 2001 | mparker
You are mixing long exposed paste back into fresh? How long has your fresh jar been open to the air? You are probably doing yourself a disservice by scavenging the paste (it could have moisture entrapped). Your visocity has definitely changed. You a
Electronics Forum | Sat Mar 24 00:50:24 EST 2001 | PeteC
Fresh paste from a factory sealed container. Should paste be scrapped out altogether if left on the stencil for too long (length-of-time?)? Our paste is Multicore CR39. Multicore reccomended the print chamber be around 22C @ 50%-60% RH. Our plant is
Electronics Forum | Thu Mar 22 17:37:06 EST 2001 | davef
Hey!!! Watch it!!! I don�t want to get you believing too much of this stuff. But if you bought that, listen to this � some circuits are so critical with that skin effect stuff that they use silver as the top level solderability preservative. Turn
Electronics Forum | Thu Mar 22 21:10:42 EST 2001 | dblsixes
Ah ha! ... You hit upon something that I discovered earlier today ... As I said in an earlier post, I was going to experiment with dog-boning the solder paste ... But upon further review, I discovered that our customer removed 75% of the pad behind t
Electronics Forum | Fri Mar 30 13:06:50 EST 2001 | aortiz
Hi, I need support on the method or applicable standard to measure the shear force strength on chip capacitors and resistors. I know the soldered joints strength is related to land desing, solder volume, pcb and component solderability, component
.gif)
