Electronics Forum: cfm (Page 1626 of 7930)

Repair of FR4 double-sided pcb

Electronics Forum | Mon Aug 26 17:27:28 EDT 2002 | dragonslayr

first time I've heard of the Cheese Its defense to excuse any momentary lapse of reason. I think I'ma gonna order me a case of them nibbles right away. A guy can't be too careful now adays.

Repair of FR4 double-sided pcb

Electronics Forum | Fri Sep 06 13:45:02 EDT 2002 | Cris Campos

To Scrap or not to Scrap? We have the answer to your problem. Visit http://www.circuit-techs.com for more information regarding Printed Circuit Board Repair, Rework & Modification in accordance to IPC 7711 & 7721.

P&P capabilities

Electronics Forum | Thu Aug 22 19:10:38 EDT 2002 | ppwlee

Has anyone done study or have feedback on 0402 placement capabilities of Europlacer Vitesse? What kind of common issues were seen when placing 0402s with the machine? We know the machine is rated for 0402s but don't know how reliable it is. Rgds, P

Shrinkage in paper phenolic pcbs

Electronics Forum | Thu Aug 22 22:58:40 EDT 2002 | craigj

Are having problems with cheap paper phenolic pcbs that appear to have shrunk. That is they no longer match the stencil (stencil is correct). Some people seem to think this is normal, is there an industry standard out there that says what is reasonab

Shrinkage in paper phenolic pcbs

Electronics Forum | Fri Aug 23 17:25:21 EDT 2002 | davef

Here's the bet. I'll bet the size [ie, length, width, thickness, etc] of the boards remain the same. It's the size of the copper features on the board that is changing. Right? Right?

CSP and underfill

Electronics Forum | Fri Aug 23 12:35:09 EDT 2002 | msjohnston

Has anyone done a study or know of one that addresses the flow / no-flow underfill differences for CSP devices. My main interest is in the reliability of the CSP and underfill. Any help would be great. Thanks, Mike

CSP and underfill

Electronics Forum | Fri Aug 23 18:51:00 EDT 2002 | edahi

weve done a few evaluations for the no-flow underfill and for the reliability I think it has already passed MRT L3 @ 220C reflow. What is it specifically you're interested about the flow u/fill??

Question on Solder Paste

Electronics Forum | Sun Aug 25 07:15:55 EDT 2002 | cnoonan

What are the industry standards for eutectic solder-paste in conjunction with the life span of solder-paste. What is the recommended duration of solder-paste on a printed circuit board. Example: You print a board, how long can it sit before runnin

Question on Solder Paste

Electronics Forum | Mon Aug 26 09:02:53 EDT 2002 | blnorman

Our requirement is 2 hours after printing before the board needs to go through the oven. Course we're in the humid south where on those 95%+ RH days we do get solder balling.

SMT

Electronics Forum | Tue Aug 27 01:19:38 EDT 2002 | zolasteven

Hi, I have a few questions regarding printed circuit board. What is the difference between the solder pads and the solder resist or mask? What is the purpose for the solder resist? What color is it? When printing solder paste should the paste be


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