Electronics Forum | Mon Apr 19 20:49:13 EDT 1999 | Dave F
| Netters, | | When I reflow a PCB there is a discoloration of silkscreen and mask. It appears if Profile is too hot! But I dont think so, maybe I'm wrong? | | 1. Kester 293 no clean | 2. 2.1 C/s for 30s to 150 C | 3. .5 - .7 C/s for 60s to 185
Electronics Forum | Mon Mar 16 18:15:32 EST 1998 | ETS, LLC
Problem occurs because the glass transition temp for FR4 is lower than reflow temperature. Our company wrote an article which was printed in SMT magazine some years ago that deals with this exact subject. Best way to deal with this is to use a center
Electronics Forum | Fri Nov 25 15:52:40 EST 2011 | davef
"IPC-2221 - Generic Standard On Printed Board Design" talks to fiducials. Anther take on fiducials says they shall meet the following requirements. * Make fiducials 1 - 1.5 mm diameter circle. * Cover fiducials with tin. * Keep solder mask opening at
Electronics Forum | Tue Apr 24 09:30:43 EDT 2012 | bdamico
Hello Laritzstange, My name is Brian D'Amico, I am the president of MIRTEC USA. I noticed your posting on this forum and I would like to offer some guidance. First, I would like to ask which system you have. Our MV-7 system is an in-line system.
Electronics Forum | Thu Apr 05 06:59:30 EDT 2018 | philc
Here, there are two possibilities - either it is a new board to us (ie built elsewhere previously) or it is a new product for the company requesting the build. If new to us only, ask for a sample PCB. You will need CAD data for pick & place machines
Electronics Forum | Tue Jul 19 08:12:23 EDT 2005 | davef
We agree with Rob. It looks like either kiss is blowing the paste around. It could be: * Nozzle id too large. * Kiss is occuring after the head has moved from the component. 0408%20MS%2001.jpg - Paste is not missing on the bottom-center pads. It is
Electronics Forum | Wed Jan 30 15:46:32 EST 2013 | davef
First, look here [http://www.ti.com/lit/ug/snva500/snva500.pdf ] This is the actual pdf from TI, not some cheap-ass reproduction, like the link you gave us. Orange polygons [and other shapes] - copper covered with ENIG * On the edge of the board, bo
Electronics Forum | Tue Nov 05 08:17:54 EST 2013 | bdamico
Hello Irene, My name is Brian D'Amico, I am the president of MIRTEC USA. I noticed your posting on this forum and I would like to offer some guidance. First, I would like to ask which camera is installed on your machines. The MV-2HTL could either b
Electronics Forum | Wed Dec 23 11:42:46 EST 1998 | Earl Moon
| | Folk's, | | I'm in need of some help / direction. I'm working on my thesis for a masters based on looking at the effect's of the solder resist promoting / reducing the amount of solder ball's during wave. I'm looking at thing's like colour, text
Electronics Forum | Wed Mar 18 09:03:57 EST 1998 | Earl Moon
| Problem occurs because the glass transition temp for FR4 is lower than reflow temperature. Our company wrote an article which was printed in SMT magazine some years ago | that deals with this exact subject. Best way to deal with this is to use a ce
.png)
.jpg)