Electronics Forum | Thu Mar 30 09:32:54 EST 2006 | russ
Not arguing dan, but are you positive that they are not copper? anyway, what is happening is as the parts sucks down onto the board from reflow the extra paste is notnecessarily sqeezed out but it has no place to go. So it will form this ball on th
Electronics Forum | Fri Mar 07 15:07:50 EST 2003 | davef
YiEng, MA/NY DDave: Usually when the gold plating bath goes south, you loose solderability.
Electronics Forum | Sun Mar 09 19:55:56 EST 2003 | iman
Which specific title books from under your pen, would you recommend for the avid process reader/learner? specific - talking about info/process/data wealth books, and not which books give the most royalties *grinz*
Electronics Forum | Tue Mar 11 12:20:13 EST 2003 | Jim
Look at "Dave's Book Shelf" here: http://www.smtinfocus.com/bookshelf/bookshelf.html
Electronics Forum | Mon Sep 16 12:56:56 EDT 2002 | dragonslayr
simon- davef is on the right track. 1st year electronics courses teaches us that you should always check the power supply first. In this case, the power supply in question is not your power source but the regulated power within the unit. I suspect o
Electronics Forum | Fri Sep 14 02:18:32 EDT 2001 | gsparka
Hi. After reflow soldering. There are lots of non wetting of leads. 71 b'd all are mounted resister,condensor,qfp,plcc,bga have got the defects so many. all defecs occured in the fine pitch ic. others are good. On some fine pitch pads not mou
Electronics Forum | Wed Mar 12 22:39:58 EST 2003 | MA/NY DDave
Hi Thanks more than you know for your honesty. Honesty adds 200-300% value in my book of all times. I am glad your problem was so easily solved, and I agree that you did the right thing by appologizing to your PCB supplier. Great, Lets move on Y
Electronics Forum | Fri Mar 07 21:10:31 EST 2003 | neil
Remember the gold is only deposited to provide an air barrier so that the nickel does not oxidise. Normally the gold is absorbed into the solder joint so that the solder forms a joint with the nickle. It is not unusual to see gold remaining on pads i
Electronics Forum | Mon Sep 17 02:56:40 EDT 2001 | mugen
Hi, (me been absent for some time...) Are your brds confirmed HAL over copper? (check out what Dave F mentioned abt possible root causes) or are the brds HAL over nickle? (shd be no problem here, if so?) or are the brds strictly nickle plated pads?
Electronics Forum | Thu Mar 06 22:34:55 EST 2003 | davef
O' Connor: Are you saying that: * You solder fine in the areas where you print paste * You solder poorly in the areas where you don't print paste Aside from that, the gold on these pads seems to be less bright than previous lots. [if that's not it
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