Electronics Forum | Tue Apr 11 10:30:46 EDT 2000 | Jeremy Smith
I am having a problem with some joints on a 100 pin pqfp and few different soics on one particular board. When viewed a 8x with a "Mantis" inspection scope the joints look as though they wetted to the ic leg but when probed the leg will pop loose.
Electronics Forum | Tue Apr 11 14:59:05 EDT 2000 | Glenn Robertson
Jeremy - What's the process flow on these modules? Are they wave soldered? What is the board finish (ENG, HASL, etc.)? Glenn Robertson
Electronics Forum | Tue Apr 11 20:26:16 EDT 2000 | Dave F
Jeremy: Parts assembler make leads of either Alloy 42 (Invar, whatever) or copper. The solderability of these leads are protected with eutectic or non-eutectic tin/lead solder, palladium or some palladium alloy, or gold. Cuppla things to consider:
Electronics Forum | Tue Apr 11 16:42:56 EDT 2000 | Chad Notebaert
I�m thinking �Poor intermatallic� It could be a few things. Lets start at the beginning. -Is your paste a 63/37 mixture? -Have you monitored you screen printing, Verify Solder deposition, Are you getting enough paste? -You say the solder looks like i
Electronics Forum | Mon Apr 17 19:30:27 EDT 2000 | Boca
All of the above is good stuff. To add, I have seen this several times if the assembly is wavesoldered. Heat from the wave can partially reflow the top side SM solder joints and weaken them. To test, check joint strength before wave and then after
Electronics Forum | Fri Apr 27 13:04:35 EDT 2007 | rmitchell
Hi, I am having some problems with my Fuji CP6 placement repeatability. The placement drifts during the build about .06-.10 mm on parts. It has happened on several different builds this week. It is enough to cause some defects after reflow on smal
Electronics Forum | Wed Mar 19 15:59:40 EDT 2008 | rmitchell
Hi, I am having some problems with my CP6 placement changing in the Y axis. I had to move all parts by +.12mm this morning. Then after 20 boards the placement shifted too high by about .12 mm The IP stayed the same with the same pcb's and fid coo
Electronics Forum | Thu Mar 20 07:58:12 EDT 2008 | cyber_wolf
#1Run a Fuji gold board and see if the problem persist. Is your board clamp slipping? Fid camera tight? etc.. To see if you have a Y axis positioning problem: 1.Put the machine in mecha check 2.Go into Y-axis 3.Place a dial indicator so that the st
Electronics Forum | Mon Mar 24 22:46:53 EDT 2008 | crashoveride
Don't try the mecha check yet unless you know how. have you checked the coupling shaft of Y-axis? If it's ok, take a look at the ball screw if it looks like being scratched or something unusual. Also, observe the movement of the machine if you hear a
Electronics Forum | Tue Dec 26 08:44:56 EST 2006 | mmjm_1099
Silly question but you do have this flagged as a polarity part correct?
