Electronics Forum | Fri Feb 22 11:49:42 EST 2002 | stimpman
Hi, Have you checked your placements pre-reflow? The most typical cause of a billboard unlike tombstoning is a pick and place issue. Billboarding will usually happen with ( profile/bad pad layout and the most common just poor center placement. I'v
Electronics Forum | Mon Feb 18 10:06:00 EST 2002 | caldon
TECH 127- I have some data points I could share with you on APS but being a competitor I do not want to clog the SMTNET Forum with "non-technical" information. My email is Cdriscoll@manncorp.com , please send me a list of questions or issues and I c
Electronics Forum | Mon Feb 18 09:58:51 EST 2002 | caldon
I am not a fan of "Gold Board" type of inspection. There are many new sophisticated ways of inspection one being neural networking. This is a method where learning occurs by exposure to a truthed set of inputs and outputs data where the algorythim in
Electronics Forum | Mon Feb 18 09:49:04 EST 2002 | Ashok Dhawan
Anyone using Kester 959 flux on Spray fluxer ? I noticed a black coating on filter element which is installed in supply line ( inside flux tank). The filter element is immersed into flux tank. It is turning blackish due to deposit of flux rosin ?? T
Electronics Forum | Tue Feb 19 09:06:11 EST 2002 | davef
Just down the street from the Cheek to Cheek Dance Studio, eh? It does seem sad ... http://www.drummoynerugby.com.au/whatsnew.htm Because we came from the land down under. The woman blow and then blunder. Can�t you hear, can�t you hear the thunder
Electronics Forum | Wed Feb 20 20:20:29 EST 2002 | davef
I saw Bradbury's last two races. Luck comes around. What do they say? "Luck is the residue of hard work." Two things: 1 I know what a smashed crab looks like and I cannot find anything like that on the link you gave. 2 All of that for a longneck
Electronics Forum | Wed Feb 20 09:38:47 EST 2002 | davef
Search the fine SMTnet Archives on � Sn62 � 62Sn � 2% Ag � 2% silver � 2Ag � etc re: "Do you have to use Tin/Lead/Silver paste only if the components are made from Tin/Lead/Silver ?" No Several points are: * Component leads with silver in the sol
Electronics Forum | Thu Feb 21 13:08:06 EST 2002 | vincent_f
Hello, I had recently a problem of crack between the solder ball (SnPb) and the Ni layer of the PCB pad. We use Electroless Ni/Au technology for PCB. This phenomena is amazing because the crack is very clean (straight) and it creates a space betwee
Electronics Forum | Mon Feb 25 07:59:47 EST 2002 | Jim Mills
Customer has requested a custom CBGA pakaged resistor network.I've seen a lot of info about TCE mismatch but aslo have heard that using 0.025-0.030 balls offers some stress releif which allows for the TCE mismatch to become less of a problem. Would
Electronics Forum | Mon Feb 25 15:09:06 EST 2002 | jax
Kelvin, You can find the Standard acceptable levels and testing procedures from IPC. Here's a little advice from the fellas' over at PCFAB: As a guideline, we recommend that for assemblies processed with low-solids flux technology and that are not cl
