Electronics Forum | Tue Jul 13 18:31:13 EDT 2010 | chrislay
Guys, I'm looking for some articles or presentation materials that can convince my customer to convert to a no-clean process. I'm new in this forum i hope anyone can point me to some leads. Thanks. Chris
Electronics Forum | Fri Jul 16 13:20:28 EDT 2010 | chrislay
Dave, Thanks for your reply and the link. ....seems can't open the articles in the link "forbidden", do i need to register? Regards. Chris
Electronics Forum | Wed Jul 14 19:23:21 EDT 2010 | davef
So, tell us more ... * Is this at in-bound inspection? Where do you observe this? * Does this affect the whole component, just terminations, ... * Could the 'brownish' be interpreted to be 'purplish'? * How wide-spread is this [eg, multiple products
Electronics Forum | Mon Jul 19 16:03:39 EDT 2010 | warwolf
Agreed, on some components we have seen a "brownish tint" after reflow it doesn’t happen on all of our resistors it only appears to be on the leads, and have also seen the purpleish tint on some other 2512 components
Electronics Forum | Wed Jul 21 14:33:56 EDT 2010 | davef
Bingo!!! Craig: You say, "I have seen several instances where the same component turns brown located directly next to another that does not." What's the difference between the two?
Electronics Forum | Mon Aug 02 09:49:12 EDT 2010 | vetteboy86
My problem is that a 10k 0805 chip looks fine next to a 100k 0805 that is brown.
Electronics Forum | Thu Jul 15 15:16:26 EDT 2010 | leemeyer
I am looking into pick and place machines that are spec'd to place 01005 components. Does anyone know of a inexpensive make(50 - 75K $ new) that can place these parts. So far all that I have found are 150K and up. Thanks
Electronics Forum | Thu Jul 15 16:29:54 EDT 2010 | dilogic
I am trying to locate procedure for PWC calibration/adjustment on GSM1/2 machines (after moving feeder plate), but can't find it in the manuals. I would appreciate if somebody can give me a hint... - Deni
Electronics Forum | Tue Jul 20 16:02:12 EDT 2010 | mikesewell
You may want to look at IPC 7721 Method 3.2 Bow and Twist Repair. In extreme cases you may need clamp or weight the pcb with bow in the other direction to yield a "flat" pcb in the unrestrained state. You will have to take the PCB up to or slightly
Electronics Forum | Wed Jul 21 11:12:05 EDT 2010 | remullis
I have some 13" long boards that warp considerably during first pass through reflow (no center support), what I've done to improve this type of warpage is stiffeners along the front and back edge. This may help with twisted boards as well.
