Electronics Forum | Wed Jun 04 00:28:27 EDT 2008 | chrispy1963
There are a couple of things that you can do. First thing to do is take a flashlight and shine it in the card edge connector of slot 2 and see if a passive component or any other part worked its way into that slot. This will cause multiple leads in
Electronics Forum | Mon Apr 06 11:58:42 EDT 2009 | c111
Jeong Ju-young You touched them all up with an iron? Wow! We have also had similar issues. What I did to prove there was a board problem was paste one & reflow one bare board with the same chem (noclean) we saw the non-wetting condition. Then applied
Electronics Forum | Fri Sep 14 15:31:02 EDT 2001 | davef
How in earthly heaven would someone else have a report analyzing the defects on your boards? Among the good failure analysis labs that can assess situations like yours are: * Robisan Laboratory 6502 East 21 St Indianapolis, IN 46219 317-353-6249 fax
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 | Thu Mar 30 14:00:32 EST 2006 | jdengler
Hi Bert, There should be an action occuring when the machine hangs-up(ie: Q motor rotating, getting ready to change nozzle, or other action). See if you can find this. The first thing that comes to mind is a loss of the signal for a nozzle in the
Electronics Forum | Thu Oct 05 11:37:15 EDT 2006 | russ
with this design you will have voids, you cannot trap the gas inside of via it has to go somewhere. These vias should be relieved from pad to prevent the scavenging of the paste during reflow. You may try a thicker stencil if you can to allow for t
Electronics Forum | Tue Jan 02 02:30:18 EST 2007 | _____
Ahh yes, 254. Don't give up on the other vision types. 254 can give you skewing as well. Your width and height are awfull close. Even with the 0.5 tolerance it is using the tolerance and saying that it is OKAY. Maybe what you measure is 1.8mm for wit
Electronics Forum | Thu Nov 08 13:12:02 EST 2007 | russ
Annular rings are too big, it is acceptable to have shorts on the common conductors. I would be willing to say the "other" supplier may have modified the artwork as well. Good fluxing, preheat and proper immersion depth are key to eliminating short
Electronics Forum | Sun Dec 02 20:02:23 EST 2007 | chs
Hi, There are QFN 32,40,48 pins with middle pad. Body size are 7x7 and pitch 0.5mm. I means as compared to 2 sided package, QFN are easily damaged by external mechanical / thermal force. Phenomenon observed are mold cap open which further caused wire
Electronics Forum | Thu May 29 12:14:57 EDT 2008 | bsumfg
Hi, I'm confused by your post. Are you saying one of your magazines does not work in the 2nd feeder postiion even if you move the magazine to a new slot on the machine or are you saying all your magazines do not work in the 2nd feeder position reagr
