Electronics Forum: pass (Page 85 of 142)

Second Pass In Wavesolder

Electronics Forum | Mon Dec 31 08:51:58 EST 2001 | davef

Warp depends on: * How close the board gets to its Tg during the solder cycle (the closer you get to the Tg the worse the warp gets) * Amount of copper on each side and the balance between the two * Thickness of the board * Overall length x width * T

BGA Via Plugging

Electronics Forum | Tue Feb 19 11:08:22 EST 2002 | Chris Anglin

Guideline for Tenting Interstitial BGA Vias It is difficult to give a complete recommendation on via tenting without an idea what process conditions are required (ex: wave pass, double reflow, rework etc.). Via Pads (as Test Points) - On Bottom

Magnetized Support Block

Electronics Forum | Wed Mar 27 08:07:42 EST 2002 | caldon

Ovation Products (devision of Airline Hydraulics) makes a fixture just for Screen printing and PNP machines. This product is called grid lock. It's tooling that is air actuated and conforms to the bottom side of your PCB with gentle (gentle enough no

Flux residue effects on circuit performance?

Electronics Forum | Sun Apr 28 07:34:34 EDT 2002 | hany_khoga

Dear Tom : I hope I �m not too late. We produce PC motherboards with some buses exceeding the speed of 100MHz . we use no clean flux and it is OK even with the residues you can see under a microscope. But according to our own experience through a mo

Gold plated PCB's

Electronics Forum | Fri May 10 01:41:04 EDT 2002 | ianchan

Steve, Hi mate, was doing some text book reading and saw this one paragraph that commented on the PCB fab plating could have residue chemistry inherent in the PCB if the fab process control isn't up to mark. such chemistry could surface to the Au/N

Calculating PCB surface area

Electronics Forum | Fri May 17 03:04:15 EDT 2002 | Mike Konrad

This conversation reminds me of the old �How Many Engineers Does It Take To�� joke. We manufacturer the ionic contamination (ROSE, SEC) testers and I am not aware of anyone that performs such exacting surface area calculations. Most people use th

Deleting UNREAD Emails

Electronics Forum | Thu Aug 08 17:51:51 EDT 2002 | davef

'The emailer on Cold Fusion came that way and we have been soooo busy trying to make sure the Geary's is gone before the date code comes-up that we just haven't had time for munitia like that.' Well, I'd like to revisit that decision, given: * Volum

Blue Haze ( Not the same as Purple Haze)

Electronics Forum | Tue Sep 03 17:48:34 EDT 2002 | dphilbrick

My customer is finding a blue haze on some SMT pads after processing, kind of looks like a water spot on the surface of solder joints. It requires 20x mag and very good lighting to see. We have done 2 different ionic tests and the boards pass to clas

Board with immersion Tin

Electronics Forum | Mon Nov 25 09:06:15 EST 2002 | jax

You might want to check the tin thickness. I believe you have a minimum of .65 microns in order to achieve a good solder joint through 3 thermal passes. In an immersion tin process, the ability to solder is time and temperature dependant. As the int

Accidental solder mask

Electronics Forum | Wed Dec 18 10:10:07 EST 2002 | davef

No, sorry not on "Dave's Bookshelf". My basis is a study done at IBM. I reference it here: http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=4941&#Message19050 Responding differently, you're correct. If you have a


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