Electronics Forum | Fri Feb 18 09:12:13 EST 2000 | Leslie Hall
Thanks Dave F for you 2 cents. You bring up some important points that what one person is doing isn't neccesary right for us. Someone might burn in their boards for 10 hours in temperature but their ramp time is only an hour versus someone else is
Electronics Forum | Fri Feb 11 08:24:51 EST 2000 | Masdi
Hi, Need help. We are starting to see a lot of small solder under capacitors and some of them can be bigger than 10 mils. For current action, we have checked through screen print process and component placement but still don't have any clue on how
Electronics Forum | Wed Feb 16 09:19:22 EST 2000 | MARK ALDER
Please check Circuit Assembly March 1998, article "Solder balls and aperture shapes" and August 1999 "Guiding stencil design". They can be contacted at www.circuitassembly.com The main cause of mid chip solder balls is the volume of paste that is p
Electronics Forum | Fri Feb 11 05:32:31 EST 2000 | Dean
Your customers design and your process capability would determin this (W/S vs. noclean). EX. Can you clean adequately for low stand off components? I have some BGA products which operate at 20GHz (atenuation and cross-talk is off the charts. )No wa
Electronics Forum | Wed Feb 16 07:55:19 EST 2000 | Dave F
CK: I hear you about pads. Most secondary side SMT pads are primary side SMT pads that are on the secondary side. This only matters when boards are wave soldered. Rather than changing to larger components, consider a bigger fight than that ... ge
Electronics Forum | Wed Feb 09 19:55:27 EST 2000 | Russ
Hello All! I have a problem that hopefully someone out there might have some ideas. I have an assembly that upon the "dental pick test" the entire solder fillet is coming up with the lead and leaving what appears to be a bare pad. I believe that th
Electronics Forum | Thu Feb 10 09:43:42 EST 2000 | Glenn Robertson
Russ - I agree with Dave and Wolfgang that the boards are the top suspect. The idea of "rework" from Gold to HASL sounds scary. Are you sure the Gold is electroplate and not immersion? Resolve that and then check the archives for "dark pad" or
Electronics Forum | Fri Feb 11 05:43:21 EST 2000 | Wolfgang Busko
Hi Russ, I thought about it and what approach I would do. All that talk about causes and reasons doesn�t solve the problem. To determine wether it�s the PCB, the component or the process I would take a bare board, a component ( and maybe a different
Electronics Forum | Tue Feb 15 09:48:33 EST 2000 | Casey Scheu
Mario, Good Luck. Your not likely to find a used unit. The Flo-Master SMD-5000 is a great unit that dosen't break. We've had units working 2 shifts for over 3 years without a single spare. When a unit works this well people don't give them up.
Electronics Forum | Tue Feb 22 23:52:06 EST 2000 | Finepitch Services
Jax, I appreciate your opinion and no one is right or wrong during such information sharing. Please consider that we all inherit a system and keeping it in the same way is the choice in most cases. Also, "keeping the mm across the house" is not gi
