Electronics Forum | Thu Jan 28 17:31:20 EST 1999 | Earl Moon
| | | Hello Netters, | | | | | | I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that t
Electronics Forum | Sun Jan 31 03:28:24 EST 1999 | Jeff Sanchez
| Hello Netters, | | I need some info, Earl or Dave, I have a PCB that exhibits a white layer on solder side. It does not appear to be surface residues (IPA has no effect), but looks like its under solder mask. My first guess is that the LPI solde
Electronics Forum | Thu Jan 21 19:38:24 EST 1999 | dean
| Hello, | | I will be evaluating and qualifying two equipment types. The first is a fountain soldering device. I need practical advice on all the stuff you guys and gals know about as good, bad, ugly, best applications, setup, limitations, and all
Electronics Forum | Thu Jan 21 20:22:02 EST 1999 | Earl Moon
| | Hello, | | | | I will be evaluating and qualifying two equipment types. The first is a fountain soldering device. I need practical advice on all the stuff you guys and gals know about as good, bad, ugly, best applications, setup, limitations, an
Electronics Forum | Fri Jan 15 15:06:30 EST 1999 | Earl Moon
| Hello, | | We are qualifying new sources of PWB vendors. We've got the first lot of "produciton" boards in and we want to put them through the paces before turing the vendors on. | | So far, the tests I can think of performing, and that we have
Electronics Forum | Fri Jan 15 15:17:21 EST 1999 | Earl Moon
| | Hello, | | | | We are qualifying new sources of PWB vendors. We've got the first lot of "produciton" boards in and we want to put them through the paces before turing the vendors on. | | | | So far, the tests I can think of performing, and tha
Electronics Forum | Tue Dec 01 09:02:18 EST 1998 | Earl Moon
| | | Hi folks , | | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our in
Electronics Forum | Fri Dec 04 20:26:34 EST 1998 | kallol Chakraborty
| | | | Hi folks , | | | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Ou
Electronics Forum | Tue Dec 01 12:44:15 EST 1998 | Earl Moon
| | | | | All y'll: I could use your input on determining when to skim dross from a wave solder pot. | | | | | | | | | | On one hand, dross protects the surface of the solder from oxidation. On the other hand too much dross may affect solder joint
Electronics Forum | Wed Nov 04 02:53:53 EST 1998 | Earl Moon
| Micheal, | | What does your profile look like for the wave? What profile does your flux say you need? My guess is it is not your profile, our testing with solder balls found that the mask on the boards was the largest contributor to solder balls
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