Electronics Forum: end and of and oven (Page 1 of 6)

Discoloring of Soldermask and silkscreen

Electronics Forum | Mon Apr 12 19:28:26 EDT 1999 | Tom B

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 C 4. 1.5 C/s u

SMT line expansion - new oven and selective solder

Electronics Forum | Tue Feb 25 16:45:45 EST 2020 | stephendo

One thing that you do not want to do is run a 240V oven at 220V. One place I worked a few lifetimes ago had an oven that had five top zones and only two on the ends on the bottom. It was something like 440V but supplied with 408V. It took a long long

SMT line expansion - new oven and selective solder

Electronics Forum | Sat Feb 22 11:37:00 EST 2020 | kylehunter

Hey all, I've made a post in the past about us expanding to a new space, but I wanted to do a new post with specific questions. We currently have a DEK 265, Phillips Opal Xii, and a Heller 1500. Our main reason for expanding is to have a lead-free

Re: Convection Oven and thermo profiling of Circuit Boards

Electronics Forum | Wed Apr 19 18:02:34 EDT 2000 | Mike Flori

If you can divide your boards into different categories it allows you to determine a different starting profile for each category, based on size, # of layers, etc. When you get a new board to profile you'll have an idea what settings will get you clo

Resistors and capacitors 01005 measurement of value

Electronics Forum | Wed Jan 30 03:20:00 EST 2019 | bane016

We measure each first board before the oven after every chageover...Assembling one offset and measure component, after we clear plate...We have reason why do that...But we're wasting a lot of time.So I wanted to see how you do it. Thank you for answe

Use and Restrictions of solder containing lead

Electronics Forum | Thu Jun 05 16:44:19 EDT 2003 | blnorman

The data we have is from an IBM report. Below 100�C the SAC reliability is almost double that of SnPb (-40 to 100�C thermal cycle). When the upper end temp is increased to 125�C the reliability drops to 75% of SnPb. I'd like to see the data that s

Use and Restrictions of solder containing lead

Electronics Forum | Tue Jun 03 12:24:50 EDT 2003 | blnorman

I have received information from the European Commissioners Environmental group that automotive electronics are not covered by WEEE (waste electrical and electronic equipment 2002/96/EC) or RoHS (reduction of hazardous substances 2002/95/EC) because

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Wed Apr 21 00:35:31 EDT 1999 | Scott Cook

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

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Tue Apr 13 18:11:00 EDT 1999 | Jimmy Strain

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

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Mon Apr 19 11:21:03 EDT 1999 | Travson

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

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