Electronics Forum: pass (Page 81 of 142)

Re: Solder Paste Testing

Electronics Forum | Sat Jul 24 00:31:21 EDT 1999 | Scott McKee

Has anyone ever heard of testing solder paste quality by pasting a board and making a determination of the quality by measuring paste height and width after the board is pasted. Would you consider this a valid test for solder paste testing? I ag

Forum posting problem

Electronics Forum | Wed Jun 16 10:50:03 EDT 1999 | Clifford Peaslee

Graham, I think your problem is unrelated to the previous message. I believe there may be a problem in the Forum Application, that is causing this problem. I have known about it for a while, but not exactly sure what is causing it. If you could pro

Re: Criterion of PCBA bending degree

Electronics Forum | Thu Jun 10 14:52:55 EDT 1999 | Earl Moon

Hello all! Recently we got a problem about the Funtional test. Some boards passed tests by using the auto-fixture(vacuum), but failed by using manual test fixture(need to plug CPU, DIMM etc.). The error symptom is no picture. We doubt it's the pr

Re: Component Thermal Profiles

Electronics Forum | Tue Jun 08 10:01:34 EDT 1999 | John Thorup

Can anyone please help me locate details on maximum allowable temperatures of components when passing through a reflow oven. I think I want the thermal profile for the part, or a source or standard which will allow me to check if I can safely

Exhausting of flux in reflow ovens

Electronics Forum | Thu May 13 20:38:32 EDT 1999 | lima

Does anyone know of any industry guidelines for the exhausting of volatiles in reflow ovens? I've seen some numbers like 1,000ppm for the oven atmosphere, but is this typical? My concern is the volatiles in my WS629 solder paste may be attacking th

Re: Homeplates..??

Electronics Forum | Mon May 03 17:10:10 EDT 1999 | JohnW

John: Homeplate is a reference from that American version of cricket ... baseball. In baseball, the pitcher throws the ball towards the batter and the ball must pass over homeplate to be considered to be strike. The ball also must be between the

Re: shield placement?

Electronics Forum | Wed Apr 28 22:16:51 EDT 1999 | Steve Gregory

Hi everyone, We started our first machine placed shield test today.We will be machine placing shields with in the next two months. I used a Fuji Qp242 today. There were no problems with pickup etc,. just vision errors. I'm sure we will work the

Re: Lifted Leads on Fine pitch QFP's

Electronics Forum | Mon Apr 19 14:38:01 EDT 1999 | Chrys Shea

25 PPM)! 1. Is there a better process to solder the leads of QFP's with lifted "minute" lifted leads still having a realiable solder joints? 2. Or has anybody tried modifying solder pads and use thicker solder paste deposit to compensate fo

Suspect BGAs

Electronics Forum | Tue Mar 16 17:05:14 EST 1999 | Jeff Dahlin

We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of item

Re: Suspect BGAs

Electronics Forum | Wed Mar 17 09:32:35 EST 1999 | Dave F

We are having a small number (~2%) of our boards pass our manufacturing diagnostics, fail once they reach the customer, fail when they get back to us and then start working again after handling them for a short time. We have eliminated a lot of it


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