Electronics Forum | Tue Jan 09 08:26:51 EST 2007 | stepheniii
If your boards are not totally rectangular part of the board can stick out past the stopper. If the fiducial is there then you can't use it. Also make sure you are not using panel fiducial co-ordinates and then expanding those out with panelization
Electronics Forum | Tue Jan 09 22:16:17 EST 2007 | guest
For chip components it is very hard to identify specially the capacitors. You could get sample of each chip manufacture and compare the color. This is very labor intensive task. I suggest to sort by value ( capacitance, resistance) than by manufac
Electronics Forum | Fri Jan 19 13:31:14 EST 2007 | lit51
Is the failure just out of tolerance or is it non functioning? For tolerance problem, compare the x-rays of the good and bad units. It will take a very high resolution x-ray to spot the differences. Changes in capacitance values can occur based on
Electronics Forum | Mon Jan 22 14:22:46 EST 2007 | muse95
Actually, I've been looking into this myself, and the B version doesn't help any more than the A version. The tables still only go to 4.5mm. And Appendix B has a bunch of formulas with undefined variables that I haven't been able to figure out. An
Electronics Forum | Tue Jan 23 23:28:54 EST 2007 | jovial_guy23
If you have flux deposits on the cooling plates, try out Zestron's VIGON RC101...It is an extremely good product especially for reflow ovens and wave solder systems. Check it out...Minimal maintenance water based chemistry with no flash point...Much
Electronics Forum | Mon Feb 12 15:57:25 EST 2007 | pr
Anybody out there using this with lead free paste and willing to share the good and bad? I used them a few years back and had some issues (wasted paste, paste bleeding out around the skids). Just curious if DEK has addressed those problems and how cu
Electronics Forum | Wed Feb 14 08:15:08 EST 2007 | CK the Flip
I agree with Rob that voids are often times paste-dependent, and it's all about the type of flux that's used. The cause of the voids, as you all know, is outgassing of flux which has nowhere to go with BGA's. Some paste mfgrs. will recommend going
Electronics Forum | Tue Mar 06 07:18:26 EST 2007 | Rob Cass
I actually bought this tape directly from a disrupter of Saint-Gobain series M797. It was placed on 6" x 9" sheets to have unique conformal coating masking cut outs made. Took some effort to get the process worked out but all is well now.
Electronics Forum | Fri Mar 16 13:47:56 EDT 2007 | ck_the_flip
Another thing to look out for... Flex circuits, if not fixtured properly tend to move around and, well, "flex" during screen printing. At another place I worked, we fixtured the flex circuit on a SMT pallet on the corner tooling pins to "stretch"
Electronics Forum | Mon May 14 16:20:55 EDT 2007 | realchunks
Hi C-Dig, Are you testing circuit boards on a static mat? It could be conductive, which might short things out. I've seen this happen to our bench techs. You might want to look at getting a set of helping hands. The gizmo that actually holds the
