Electronics Forum | Fri Oct 01 14:16:15 EDT 1999 | Rick
I know there are a ton of variables that affect the overall height of a BGA after soldering to a PWB but... I'd like to know if anyone has done an analysis of (or if it's documented) as to what the pre and post reflow height dimension as measured fr
Electronics Forum | Sat Jan 03 18:13:58 EST 1998 | David Jacks
Tom: You are right. Pre-heating is just as necessary in rework as it is in intiial production. Zephyrtronics produces an economical convective bottom side pre-heater known as an airbath. This product ramps the substrate and assembly at 2-4 degrees
Electronics Forum | Mon Feb 03 23:49:00 EST 2003 | Dreamsniper
Hi, Has anyone who's using vapor phase process able to help me troubleshoot tombstoning? I raed about uneven forces during reflow due to misalignment, pad design, paste volume deposition unevenness due to dirty stencils, worn stencil printer parts s
Electronics Forum | Wed Apr 07 09:54:32 EDT 2004 | Dreamsniper
Hi Guys, Can anyone help me in providing their experience in process related problems with regards to the above equipment? I noticed that it's slightly different with the wave soldering. Wave Process: Apply Flux, Pre-heat then Solder Selective Sol
Electronics Forum | Mon Aug 16 13:31:45 EDT 2004 | Dreamsniper
We do not have problems with preheating. before we used to suspect that the cause of tombstone was that because the semi-auto and manual version do not have pre-heat stage. We had 1 with an IR heater and it is quite okay. you can use it too to cure a
Electronics Forum | Wed Sep 08 16:21:41 EDT 2004 | rohman23
I'm in a similar situation. We have a pre-historic semi-automatic printer that does a decent job, but would like to get an automatic printer. I've only just begun looking into the different options available, but would like one that could inspect t
Electronics Forum | Wed Dec 22 19:09:17 EST 2004 | rohman23
Very strange...I just logged into the internet to come post this very question for all the lurking experts. We have a 16 layer rigid-flex that we have never baked. Our board vendor is expressing concern that we do not perform a pre-bake before assy
Electronics Forum | Mon Jul 30 17:32:34 EDT 2007 | chrisgriffin
When you teach the "teach boardstop Y" make sure the camera is seeing the leading edge of the board and not too close to the rails. It should calculate the pre-stop position correctly. I assume you have thoroughly checked the sensor. Also check th
Electronics Forum | Fri Oct 12 14:53:40 EDT 2007 | chef
The only sophisticated customer I have is 100% ROHS and actually spec.s material and properties for the fab.'s. The rest have mostly just called in and requested we process ROHS without having to change the drawings or provide a spec. nary a complain
Electronics Forum | Mon Nov 19 09:04:21 EST 2007 | rgduval
We determined moisture more as a diagnosis based on omission. We eliminated the other variables, noted that the parts were cracking in reflow, and deducted that it was trapped moisture. As the moisture expands, the component can be cracked/destroye
