Electronics Forum | Fri Mar 23 09:13:48 EDT 2007 | Peter W
Hello, those plated and solderable via in pads have two critical points: 1. We have discovered that _sometimes_ the plating seems not to be perfect, as extreme voiding is visible in tha bga solder ball 2. The detection of some defects by AXI is limi
Electronics Forum | Wed Mar 14 20:06:54 EDT 2007 | vshan
Hi All i need some help here, currently experiencing connector leg shifted due to solder paste shifted from pad ~0.3mm. I did adjusted the reverse/forward X, Y and titah but still shifted. Product : flex circuit with 28 connector on the panel. Each
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 | Wed Mar 14 21:57:58 EDT 2007 | Dave Jurena
We are setting up a facility in China and would like to verify the resistivity reading on our Westek wash machine. The only tool we have at this time is a multimeter. The machine reads .570 Mohms and the MM reads around .25 Mohms at a probe distance
Electronics Forum | Fri Mar 23 08:41:06 EDT 2007 | oldsmtdude
And I might suggest AOI at post print and post place to hone your process before even considering post reflow AOI. Post reflow AOI alone is iffy and an absolute chore to keep up with. But monitoring paste and placement are very easy. Establish a sta
Electronics Forum | Thu Mar 15 09:11:06 EDT 2007 | jdengler
Chrissie, This varies widely by paste, room temperature, and humidity. You would need to do a DOE for you exact set-up. Since you say the room is uncontrolled you need to keep in mind that time will drop as temperature goes up. Different pastes re
Electronics Forum | Mon Mar 19 10:35:44 EDT 2007 | dyoungquist
We use a no-clean lead free paste with our manufacturing floor temp 70-75F and humidity 20%-30%. We have found that if the time from pasting a board until it goes into our reflow oven is less than 4 hours we have no problems. If it is greater than
Electronics Forum | Mon Mar 19 12:25:11 EDT 2007 | slthomas
This test nicely demonstrates the bond between parts and paste over time, but what about tack of paste on unpopulated boards? It seems she would also need to be testing by placing parts on boards that have been printed for 15 minutes, 30, 1 hour, 2
Electronics Forum | Thu Mar 29 08:58:06 EDT 2007 | chrissieneale
Started measuring rework last week - on some of the boards we are looking at a shocking 20% right first time yield. The paste thing has to be fixed as it's being left more than four hours. Thanks for all the comments - Will let everyone know the re
Electronics Forum | Thu Mar 15 12:33:56 EDT 2007 | mmjm_1099
I was wondering if anyone out there knows where I may find a video of a IP3 in motion. I am looking into the used market for IP3 and want to show management. I have asked Fuji and they have come up empty handed as they only show there latest and grea
