Electronics Forum | Thu Apr 22 20:26:39 EDT 1999 | Dave F
| | On various PCB's after building processes,such as reflow, flowsolder and wash. The soldermask on the PCB's have become discoloured, like a 'marble' effect all along the solder side of the board, it is lighter in contrast than normal, although whe
Electronics Forum | Wed Apr 21 20:50:26 EDT 1999 | Dave F
| I'm having problems with trying to get a good solder joint using a Ceramic PCB. We are using AMTECH hi-temp solder (ws-486 96.5/3.5ag). My profile looks great and I used the recommended profile from Amtech with a few adjustments. My max temp is abo
Electronics Forum | Thu Apr 22 14:31:39 EDT 1999 | Dave F
Michael: Two things: 1. Profile: A. Your FR4 profile will not produce good solder connections on your ceramic substrate. Hey wait a minute, you soldered FR4 at 250C?? Ceramic is a themal sponge. You'll need to play, but it should be easy compare
Electronics Forum | Mon Apr 19 17:44:43 EDT 1999 | Chrys Shea
| | While trying to sell me a low temperature baking system for SMDs the salesman mentioned that the 125C for 24hr bake had been known to cause co-planarity defects. | | I thought I'd ask some experts. Any help guys? | | | Gerry: I imagine there co
Electronics Forum | Wed Apr 14 18:26:18 EDT 1999 | Earl Moon
OK, this is it. This is the reason, root cause, and all that other technical stuff. Only thing is, it ain't technical. 1) I hate registering for anything 2) I hate being cooped up 3) I want freedom 4) This ain't no 60's thing 5) I'm not angry or be
Electronics Forum | Thu Apr 15 16:22:30 EDT 1999 | Nancy V
You got me curious. Why are you asking if I like Mexico? Nancy | OK, this is it. This is the reason, root cause, and all that other technical stuff. Only thing is, it ain't technical. | | 1) I hate registering for anything | 2) I hate being coop
Electronics Forum | Thu Apr 15 18:21:23 EDT 1999 | Jeff Sanchez
| OK, this is it. This is the reason, root cause, and all that other technical stuff. Only thing is, it ain't technical. | | 1) I hate registering for anything | 2) I hate being cooped up | 3) I want freedom | 4) This ain't no 60's thing | 5) I'm n
Electronics Forum | Tue Apr 13 09:11:54 EDT 1999 | Dave F
| We process both tin/lead plated boards and gold plated boards in our surface mount group. I have used Sn62/Pb36/Ag2 solder paste on all gold plated boards to help prevent gold scavaging. To reduce the amount of different solder pastes we have to
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 | Wed Apr 07 11:53:59 EDT 1999 | Dave F
| Could somebody send me some information about the SMT Beginning? | I mean, when, where, why, SMT starts. | | Thank you, | | Roberto. | Roberto: There�s lots of reasons for getting into SMT. Some of which follow: 1 Manufacturing engineers thi
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