Electronics Forum | Tue Jun 19 17:42:38 EDT 2007 | dyoungquist
We run a TP9 machine and had a very similar problem with it. On a TP9 machine there is a power supply board where all the voltages are generated. It is located on the bottom side of the unit. The problen was with one of the fuse holders. The co
Electronics Forum | Tue Jun 26 21:41:10 EDT 2007 | davef
4.4 Determine the amount of flux on the board. 4.4.1 Get a piece of corrugated cardboard and a weighing scale accurate to 0.01 grams. NOTE: Use cardboard with alcohol fluxes to slow their evaporation and get good data. 4.4.2 Weigh the cardboard. 4.4
Electronics Forum | Wed Jun 27 11:59:55 EDT 2007 | samir
*Preheat zone *Maximum slope is a time/temperature relationship that measures how fast the temperature on the printed circuit board changes. The ramp�up rate is usually somewhere between 1.0 �C and 3.0 �C per second, often falling between 2.0 �C and
Electronics Forum | Thu Jul 12 07:52:08 EDT 2007 | cyber_wolf
I agree avalancher. Your description is a valid point. But, I am still under the impression that the vac level is a separate issue. His original problem was 0402's missing off the board ,and weird measurements showing up when parts get rejected. I w
Electronics Forum | Thu Jul 05 19:37:15 EDT 2007 | davef
We assume the three leads are lined-up perpendicular to the wave. Without taking corrective action, we know this: * 50 thou pitch will bridge * DIP do not bridge As a corrective action that doesn't invovle a respin of the board, decrease the solderm
Electronics Forum | Fri Jul 06 12:11:34 EDT 2007 | james
We are starting to see issues with using Kester WS R562 with lead free components. The joints look grainy on almost all of the 0402'2 and other small components. Some of the solder does not solder to the terminations. These are hybrid boards which
Electronics Forum | Wed Jul 11 14:48:25 EDT 2007 | rgduval
My boss just received some info through a design mailing list that he's on claiming that FR406 is not RoHS compliant based on the limited number of processing cycles at RoHS compliant temperatures. I would guess that this is related to the relativel
Electronics Forum | Thu Jul 19 12:25:51 EDT 2007 | patrickbruneel
Amen to that Hussman. The new lead-free world is not based on science or environment it�s all about $$$$$. And as I said before the promoters of lead-free care less about quality or reliability they just take this great opportunity to double their
Electronics Forum | Mon Aug 06 10:03:01 EDT 2007 | slthomas
I agree with jdengler on the rotary table being skewed. You need a couple of dowel pins (1 1/2" long x 1/4" dia., I think) to align that disk. Each idler is held on an eccentric cam and can be adjusted to square up the rotary table by dropping the do
Electronics Forum | Wed Jul 25 10:57:08 EDT 2007 | cecil
Our board layout folks are currently designing a PWB using a 132 QFN. The component is .5mm pitch with .35mm square pads. The component manufacturer recommends the following footprint: .4mm square land .3mm square solder resist 1.why do they spec
