Electronics Forum: after (Page 296 of 656)

Silver Sulphide Contamination of Resistors

Electronics Forum | Fri Feb 23 10:24:24 EST 2001 | johnthor

We still build a legacy product with a primitive backplane using silver plated fork terminals for outside world connections. After some 20 years of no problems the fork terminals on raw stock PCBs were black and almost unsolderable. Because of the

Round Solder Lands

Electronics Forum | Fri Mar 02 06:25:04 EST 2001 | PeteC

Thanks for your feedback. All the 0603 chips have the round solder lands but the 0805 chips and larger are rectangular. After speaking with the designer on it he said they chose round lands for the 0603 chips to get higher density of the circuit trac

White powdery residue following Wave

Electronics Forum | Fri Mar 02 15:44:26 EST 2001 | traviss

Is this after wave or wash? Its too bad the archives are gone this one has come up a bunch of times. Most of the time its caused by rosen or no clean flux being put through a water wash. There are several other possibilities. You will probably hear w

AOI systems

Electronics Forum | Wed Mar 28 15:37:20 EST 2001 | pteerink

Steve, When you say "CAD input", do you mean centroid data ( xy locations ) or generic cad info straight from the layout software. ( so far the machines I have been looking at use centroid) What are your rates of "false failures" and how do your o

Solder Paste Volume

Electronics Forum | Thu Mar 29 01:22:57 EST 2001 | chinaman

Hello everybody, Two questions came up during an audit (old topics once more): 1. we are not checking the solder paste volume/pad height after printing - others are using an AOI, but is it really necessary? We just do visual inspection randomly. We

Stencil Cleaning

Electronics Forum | Fri Apr 13 05:59:58 EDT 2001 | zam_bri

I�ve just had an argument with my Boss on the frequency of Stencil cleaning. He told me to remove the procedures that asking the operator to send the Stencil for cleaning ( using Automatic machine ) after every 8 hours. I said big NO!! NO!!. He said

Wavesolder Carriers

Electronics Forum | Tue Apr 17 18:11:48 EDT 2001 | billschreiber

Adam, After a thorough cleaning, I see most of my customers using a weekly maintenance schedule. However, because the characteristics of the post solder flux will contaminate the wash solution of the stencil cleaner, some customers wait until they a

Mydata vs Siplace

Electronics Forum | Tue Apr 24 02:07:27 EDT 2001 | joe

It's not so much of a change but a new investment. We have Siplace lines now, and very pleased with the performance. The reason for looking at the Mydata is to remove all the small stuff from the faster lines and reduce changeover times. The idea is

Re: Certifying Learnsoft Training

Electronics Forum | Wed Nov 29 08:33:05 EST 2000 | Dave F

No, the specific question is on the "Soldering & Rework" disk. Yours is a good approach to updates. [No lakeside baronal mansion, eh???] I have sent a list of unusual questions to Evelyn that includes the above example. It's difficult to document

PBGA Criteria

Electronics Forum | Thu Oct 26 16:38:08 EDT 2000 | Philip A. Reyes

Hi Sir Charles! Good Day! I hope you can help me about my queries. 1. What is the acceptable misregistration or misalignment of balls after reflow soldering of PBGA module on the PCB? 2. Is there any criteria for solder ball defect or solder beads


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