Electronics Forum | Wed Apr 21 17:27:27 EDT 2004 | russ
We always use the regular production reflow profile when we use this method. Since you don't want to do that, All that is required is to ramp the part up to temp to get the balls to melt. If you don't exceed 2C per sec. in a ramp you will be fine.
Electronics Forum | Wed May 26 05:05:04 EDT 2004 | curious
hi, we have a batch-rework for a axial 2-lead LED component. we are thinking of bending both ends of the axial-leads into a L-shape at 90degree angle, and solder the flat-end of the L-shape flatly to the PCB's SMT pad. hope the experienced guys/exp
Electronics Forum | Wed May 26 06:54:07 EDT 2004 | davef
Q1) if this is an acceptable component-lead modification? A1) Yes, it's acceptable Q2) and does this mod meet any existing IPC specs?(did a internet search but no result) Q2) IPC repair guidelines are: 7711A/7721A - Rework and Repair Guide For ot
Electronics Forum | Mon Jun 28 10:17:44 EDT 2004 | davef
People like flat surfaces for placing and reflowing certain components, like fine pitch devices. Some board suppliers can supply HASL that is flat and well controlled from an amount of material stand-point. Unlike OSP, HASL has a wonderful shelf-li
Electronics Forum | Fri Aug 13 19:59:48 EDT 2004 | Hi CJ.
Don't be discouraged about the Zephyrtronics Air Baths from Chris' comments. I'm sure he means well, but I've seen these units being used by people who swear by them. You might also look at the APE preheating units and the Zephyrtronics...but you sh
Electronics Forum | Fri Nov 12 11:07:08 EST 2004 | valuems
Hello Terry We have found that the best angle for metal blades is 37 to 45 degrees. Metal blades won't enter the stencil opening, rubber does. Metal blades are with out question the best way to print. If you go over 45 degress the blades will leav
Electronics Forum | Sat Dec 18 15:14:35 EST 2004 | grayman
Weller is a big name in hand soldering. I have beed using weller soldering station even when I was a student in secondary level. I believe that they will have a newer version like 3000S/st or higher. Pricing for these new model is less than US$ 1,900
Electronics Forum | Wed Jan 12 10:15:43 EST 2005 | davef
We conformal coat our boards and get pretty good coverage along the edges of BGA. If you need coverage along the edges and are not getting it, your supplier may be able to recommend a different material or application method. Most often, underfill
Electronics Forum | Tue Mar 01 10:50:32 EST 2005 | pr
I think the 1st option would be the best. I have found that a touch up person WILL TOUCH UP SOMETHING, regardless of the electrical needs of the board. This leads to a lot of unnecessary rework of joints. I would hope QC is tracking the defects and t
Electronics Forum | Mon Mar 07 22:20:56 EST 2005 | rf
I'm doing some research into some various costs for defects and work stoppages in an SMT environment. Specifically, I'm interested in what are the costs for a company to rework defective boards...from easiest to hardest component but not to include c
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