Electronics Forum | Thu May 03 18:40:34 EDT 2001 | pzohbon
We produce a board right now with a QFP that has 20 mil pitch and we are seeing problems with the solder deposition. I believe it to be a cleaning issue which we are addressing. Soon we will be pasting for bga's. Is there a problem with using inter
Electronics Forum | Mon May 07 22:29:52 EDT 2001 | davef
4 wire per sec ... you figure how many you need] Encapsulation ~$120K for a dispenser [10 sec per die ... you figure how many you need] plus a cure oven ~$100k Throw in a another ~$100k for marking and cleaning Check the September 2000 SMTnet New
Electronics Forum | Thu May 10 08:56:38 EDT 2001 | stefwitt
I think the main purpose of cleaning a fiducial is not to make them nice and shine, but to get a haze on them. In particular dome shaped fiducials create too much reflection from the light source and distort the image. The eraser pencil is a bandage,
Electronics Forum | Tue Jun 05 20:45:54 EDT 2001 | davef
So, yer lookin' to detect a ~25um glob on the wall of the aperture on yer stencil, eh? Why not wash your stencils before you put them away? That's what we do. Give 'em a quick looksee, then rack 'em, if they're clean. Give 'em anudda looksee befo
Electronics Forum | Thu Jun 07 13:40:12 EDT 2001 | kerryn
Dave, We have very short runs (less than one hour). We have stencils all over the place waiting to be cleaned. It is too time consuming to scope each stencil to inspect for cleanliness. Do you know of any automated or scanning devices that can ra
Electronics Forum | Wed Jun 20 14:02:50 EDT 2001 | raton
I'm interested in the masking boots and covers you mentioned. We have looked at them before, but we use an acrylic conformal coat and clean up with toluene. All of the boot type products we have looked at seem to breakdown in toluene. Do you reuse
Electronics Forum | Mon Jun 18 21:46:27 EDT 2001 | davef
It's possible that combining these two fluxes is benign, you sure can't say your customer is wrong, can you???? So, what is the intent of leaving these two different flux materials on your board? What is the residue remaining on your board as your
Electronics Forum | Mon Jul 23 10:21:50 EDT 2001 | caldon
Since we use tons of different fluxes and chemistries we clean often. A quick trip to our batch cleaner- run one cycle.....back to the bench. We have no control just a weekly thang. When the sponge starts to deteriorate then it is replaced. Caldon
Electronics Forum | Sat Jul 28 05:31:20 EDT 2001 | nop_e
Hi all I just got feedback from my customer about "White residue problem" around solder joints with manaul soldered connector at customer site and included the failure analysis report that there is residues of Cl,S,Na . I 'd like to know, the whi
Electronics Forum | Tue Jul 31 10:41:49 EDT 2001 | ronho
I'm interested in process information from someone who has experience with this package, such as pad design, stencil aperture dimensions, stencil thickness, unique issues, profiling, solder paste. Design is considering this package for future produc