Electronics Forum | Wed Feb 07 20:57:31 EST 2001 | Kyle
What are you placing on this equipment? If you are placing flip chips, you need to have a glass plate test system to verify your machine is accurate and repeatable. If you purchase new equipment and plan to place flip chips or ultra fine pitch, it
Electronics Forum | Wed Feb 07 21:56:00 EST 2001 | davef
Every critter out there with large incisors adapted for gnawing and nibbling has a different theory of solder ball formation. [My theory: It�s punishment for using NC fluxes. Stand and deliver. My solder balls end-up in the gross filter connected
Electronics Forum | Thu Feb 08 09:07:22 EST 2001 | Hussman
OK, without knowing the specifics, why does everyone blame the oven? Most solder balls occur around R's and C's in almost every shop I've been to. The best place to start looking is the screen printer - not the oven. Sure the oven is the last proc
Electronics Forum | Fri Feb 09 17:46:50 EST 2001 | raton
We've used them for several years now. They have done what they were purchased for and more. But, as time goes on, expectations of them rise, sales and marketing hype them as the ultimate cure-all of all defects, and then disappointment is experien
Electronics Forum | Wed Feb 14 21:14:45 EST 2001 | davef
BGA Shorting 1 Damaged mask in between the BGA pad and via on the substrate. 2 Poor print registration. 3 Poor via segregation from the pads? Are they tented or is there just a dam in between? 4 Review the profile. You can run into a number of p
Electronics Forum | Thu Feb 15 19:44:50 EST 2001 | davef
I assume Roland [er someone like that] explained on the Main Conference also known as the Forum, the blue "New Thread" button near the middle of the page and 1 1/2" in from the right margin as the preferred way for posting a new thread. [Well, if th
Electronics Forum | Thu Feb 15 19:41:38 EST 2001 | davef
What do you mean by "But after performing temperature cycle test, the former aging rate (from the shear strength ) seems faster than the latter."? Comments are: I can't recall having heard the term "precipitation hardness" [not that that means anyt
Electronics Forum | Thu Feb 15 23:52:31 EST 2001 | Dreamsniper
Hey guys, I ran a couple of profile in our wave solder machine using wave optimizer and this is what i got: Parallelism = 0.0 Immersion Depth = 2.1mm to 2.4mm with varying immersion time from 1.1 sec to 3.1 secs. Contact Length = between 5.0 to 6.0
Electronics Forum | Fri Feb 16 02:00:12 EST 2001 | PeteC
Dreamsniper, The optimum contact (dwell) time in the wave should be 2 seconds. Contact band width is a function of conveyor speed. For an example, 5cm of contact band width at 150cm/min. conveyor speed will give you 2 seconds of contact time and 2cm
Electronics Forum | Mon Feb 19 13:31:25 EST 2001 | billschreiber
Hello Mark, EPA Certification can be a tremendous help to the user that is evaluating new cleaning processes. Let�s face it, if it wasn�t for the Earth�s ozone layer, everyone would still be using CFCs and a vapor degreaser to clean stencils, PCBs
