Electronics Forum | Wed Aug 24 22:11:36 EDT 2016 | davef
I'd guess that "black pad" is not the issue that you need to address, because only 2 of your 5 test points has the problem that we seem to be discussing. I'd expect "black pad" problems to be more wide spread. Something is going on at those two locat
Electronics Forum | Mon Jun 27 11:01:58 EDT 2016 | mufflerbearings
From the pic, it looks like you have a bad board; ENIG process issue. It used to be called black pad for SMT but I'm sure it's the same condition for T/H. Any good electronic lab should be able to id the black stuff. I would also send raw boards bac
Electronics Forum | Mon Jan 19 09:49:20 EST 2004 | davef
Not as such. Choices are: 1 Cut and epoxy some board foil from your board fabricator. 2 Sacrifice part a pad repair kits from the likes of: * Engineering Lab 905-785-1982 * Circuit Technology Center 978-374-5000 * General assembly suppliers catalog
Electronics Forum | Mon Jan 19 20:07:07 EST 2004 | russ
I once used some foil tape from 3M with hightemp adhesive. It actually sorta worked. Russ
Electronics Forum | Tue Dec 31 02:10:54 EST 2019 | sssamw
The video showing wave contact is not consistent and not stable from width size, make it better.
Electronics Forum | Fri Dec 27 16:12:54 EST 2019 | anteiv
thank you for reply here is picture of the board https://imgur.com/a/i2MfFBw on the bottom are pins/components which height is about 3-4 mm from bottom of the board we had to increase distance of board from nozzle to make clearance and we increas
Electronics Forum | Fri Dec 27 12:12:29 EST 2019 | slthomas
As has already been mentioned, black residue is usually either from dross or just a dirty pot, pump, baffles, etc.. I also saw that maaaany years ago in a system that used a flawed oil intermix "feature" but hopefully those systems are long gone.
Electronics Forum | Fri Dec 27 11:42:18 EST 2019 | emeto
I could not see pictures of your board - please attach one or two. So to answer your questions: 1. wave should not overflow over your board - mostly we use pallets as carriers to protect the assembly. 2. Solder dross is caused because your wave is no
Electronics Forum | Fri Dec 27 17:40:55 EST 2019 | rgduval
Using no-clean flux will make the boards very difficult to clean. If you can switch to water soluble flux, your life will be much easier. The "icicles" lead me to think that the board isn't getting hot enough in the pre-heat cycle, and/or there isn
Electronics Forum | Mon Aug 29 08:44:57 EDT 2016 | jrrt_williams
As an OEM repiar tech I would run into "Black Pad" on occasion, though mostly on surface mount pads. The only way I could remove the oxidation was to apply water soluble flux and add solder, then wick away the excess. This left me with a suitable s
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