Oh boy, Oh yes, Oh we�ve seen something similar recently! Had to do with loss of capacitance over time, not that much problem in most of the applications but in our case.... not good at all. Engeneering wrote a - Whatyacallthat?- "changenotice" and the service is required to change that bugger each time a unit takes this extra loop (still have to deal with enough other update stuff especially the SW).
The second more serious "faux pas", our so much loved and only used NC-solder paste turned out to be something else but "NC". Who said that this is NC????... err, mmmh ? , the sales guy did? .... don�t look at me, I wasn�t even working for this company at that time ..... datasheet was in english, couldn�t read it , and similar responses.
Our first, eh second action, sit down, turn of all noise, take some deep breathes, ... out....in ....out...in... - than check if some problems did occur due to this fact ---> no
- can it be left uncleaned on the board? ---> for many applications yes says our supplier and many companies do ( techi over there)
- are our products specified for conditions that we and our customers can live with that? ---> well, at first impression ( and management decision ) , yes
- will have that checked in a Lab soon (as soon as they hand some samples !!!!!)
The rest is hope and pray..
Ah yes, I forgot, the new samples of NC that�re coming in do well at first sight although I noticed a tendency towards solderballs and beadings , have to keep an eye on that, ... but now there�s written down in the datasheets, RESIDUES DON`T NEED TO BE REMOVED
Ahya, Dave, so we all have to carry more or less extra weight on our tour here
Remember to focus on .. in .... out.... out.... , helps a lot
Wolfgang
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