Electronics Forum: 3

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Tue Apr 13 18:39:24 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 f

Re: Discoloring of Soldermask and silkscreen

Electronics Forum | Tue Apr 13 23:08:56 EDT 1999 | Jeff Sanchez

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.

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: BGA and Gold Boards

Electronics Forum | Thu Jun 25 09:53:04 EDT 1998 | Earl Moon

Has anyone had experience with placing BGA on gold plated boards. I thought I read a while ago there was a problem with embrittlment causing cracked joints. If anyone has experience with this your feedback would be great. Mike Mike, You

Solder Paste and fine pitch components

Electronics Forum | Wed Sep 18 12:31:16 EDT 2002 | dragonslayr

My suggestion is to conduct a Design For Manufacturing (DFM)study on the assembly in question. Pay particular attention to the pad sizes, component lead dimensions and satisfy yourself that those two factors are correct. Given that pads match compone

Used Equipment Support (Registration?)

Electronics Forum | Fri Nov 01 11:27:34 EST 2002 | kenBliss

Gimme a break I am rather disappointed with many of the comments here. Most appear to think that the OEM should supply what ever is needed and when ever it is needed and not charge for it or just do it cheap. Or you think they overcharge for it.

Bare PCB baking

Electronics Forum | Fri Nov 22 10:38:30 EST 2002 | slthomas

The follwing is from the Technet archives, per IPC's Jack Crawford. I dug it up during some investigation of a supplier's issues with humidity in an Asian plant: There is support for this in IPD-HDBK-001 w/Amendment 1 Handbook and Guide to Suppleme

LGA36 6.5 x 3.5 mm

Electronics Forum | Thu Apr 12 22:54:06 EDT 2007 | mika

conductor on the narrowest place ~0.07mm we suggest them to go for a PCB solder pad down to 0.30mm. The Conductor width is: 0.2mm The current problem they are having now is that there will be a problem with 14V to narrow the conductor to the narrowe

need help with Philips CSM84

Electronics Forum | Sat Mar 31 11:03:21 EDT 2007 | jmelson

I have a left to right conveyor, so the X offset is larger, but that is not major. You say "Make sure you are teaching with the unit that the machine defaults to or asks for." This is the beam sensor, and I have found no way to change this, either

New to SMT Equipment

Electronics Forum | Wed Sep 17 13:00:25 EDT 2008 | mw_fl

For the most part there would not be a lot of change over. There are two primary boards at this time that would be run on the line that also use common components. At this point all but a couple of the pick and place machines we have looked at have t


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