Electronics Forum | Wed Aug 09 19:14:15 EDT 2006 | Board House
Our Manufacturing policy regarding welds is as follows. 1) Inner layers - depends on Core thickness and line width. Our shop will not do any welding on core thickness less then 5 mils. or line width less then 5 mil. Good AOI practices reduce the a
Electronics Forum | Tue Jul 10 19:16:08 EDT 2007 | 5why
We have filed returned (approx. 5%) of the boards that exhibit inner layer short @ a particular connector locations. X-section revealed there exhibit Cu residue, but aside from that, we also suspect there could be organic contaminant, what test shou
Electronics Forum | Fri Mar 06 07:15:38 EST 2015 | saoasasd
Hi, I have faced some problems with DQFN PACKAGE 132 PIN. After some cross sections and dye pry analysis we could find a head on pillow situation always on inner row pads. The PCBAs are double side and the DQFNs are assembled on Bottom side (Noteboo
Electronics Forum | Wed Aug 29 05:30:30 EDT 2018 | teresat2
I guess these boards only used Fly test. Flying needle test is one of the methods to check the electrical function of PCB (short circuit test). The flight test machine is a system for testing PCB in a manufacturing environment. Instead of using the
Electronics Forum | Mon Nov 06 11:34:54 EST 2000 | Wolfgang Busko
Hi John, can�t find that one in the archives. Isn�t all the trouble you may get dependend on the way you design the thing? For example, tight fit with with step/ridge nearly zero and clamps for holding down the inner circle to prevent vibrations. F
Electronics Forum | Wed Jan 17 20:33:19 EST 2001 | davef
The corner balls are supposed to collapse, but at roughly the same time as the other balls collapse. Also, those balls are located in the place that isthe easiest to get hot. Think about cranking-up the bottom heat, waiting, and slowing down the pr
Electronics Forum | Fri May 14 17:19:34 EDT 1999 | Herb Pabes
Hi Chrys! I've also heard stories of the water-based material "attacking" the inner workings of their spray nozzles - probably due to the water hanging around parts and corroding them. Did you have any such problems with the USI ultrasonic sprayer?
Electronics Forum | Thu Jun 27 08:48:08 EDT 2002 | yngwie
I was approached by the comp. suplier to change the capacitors that I currently used. No change in elect. charateristic, but only on : a) change of palladium to nickel base inner electrode b) outer electrode material i.e. from silver to copper. Que
Electronics Forum | Mon Aug 02 13:46:10 EDT 2004 | Bob R.
Via in pad lets your layout guy run traces on inner layers so there's more more area available on the outer layers for placing parts, test point, etc. There are also electrical advantages due to shortening paths, but I'm just a simple mechanical eng
Electronics Forum | Fri Jun 17 11:08:37 EDT 2005 | Stefan
The inner light ring creates a direct light to the fiducial. If you deal with a very shiny fiducial (or board) the light will reflect into the lense, create white spots in the camera CCD chip and make the fiducial shape un-readable. Use the outer li
