Electronics Forum | Fri Apr 08 12:03:31 EDT 2005 | mmjm_1099
Here we go again..... check all past forums on Lead-Free. There is a TON of stuff that people has talked and commented on for this. Plus a good site for alot of information I found is: http://www.speedlinetech.com/news_publications/white-papers.aspx
Electronics Forum | Mon Apr 11 06:37:59 EDT 2005 | amstech
As long as you have a continuous profile with required soak and dwell periods, the zone lengths do not matter. For lead free, usually ramp to peak is preffered.that is with minimum soak (you can not avoid soak anyway. You can achieve the profiles irr
Electronics Forum | Tue Apr 12 22:23:05 EDT 2005 | Al
The way we do this, is to tape a transparent film to the PCB. The printers and chip shooters can read fiducials no problems. Once it has been run through SMT, simply remove the tranparency film and the PCB is ready for use, no mess no cleaning and yo
Electronics Forum | Mon Apr 18 20:13:27 EDT 2005 | Frank
Have you seen this mix up as well? 01005-inch (some people are simply saying 1005) components in metric are 0402-mm. And since 0402-inch is 1005-mm, it is a never ending circle of conversion confusions. We are using millimeters on the machines, bu
Electronics Forum | Fri Apr 22 00:57:56 EDT 2005 | Frank
If you are looking for a chart of component conversions, you can go to Topline Components's website. Topline is a vendor for dummy test parts. http://www.topline.tv/Products.cfm Click on the chips, and then select the type of chips (resistor, cap,
Electronics Forum | Wed Apr 13 15:21:25 EDT 2005 | mmjm_1099
Thats called technician syndrome (fine when your there and bad when you walk away). Is someone inspecting the board before reflow? If so make sure they don't touch it and run about 5 boards and see if it's consistent for placement. What type of pro
Electronics Forum | Fri Apr 15 11:16:03 EDT 2005 | HOSS
It's a longshot but.....I have seen low-standoff parts move caused by via's under the part erupting from within internal layers (outgassing). If this is a multilayer PCB and vias are not well plated or pourus, they can and will expand when heated.
Electronics Forum | Mon Apr 18 09:52:36 EDT 2005 | pjc
FormFlex and the GridLok system will not work on a semi-automatic printer. They were designed for fully automatic machines. The print table is very shallow on the DEK 248, SMTechs and MPM SPM, UP100 and MicroFlex. DEK should have magnetic base suppor
Electronics Forum | Wed Apr 13 18:28:21 EDT 2005 | RT
We have a situation where our customer returned a device (BGA) with a missing solder ball. The process is Copper-Nickel-Gold-Solderball. EDX revealed that no trace of gold nor solder material (lead-free balls). Could poor Au plating/adhesion cause
Electronics Forum | Thu Apr 14 05:23:10 EDT 2005 | dj_jago
What is the pitch of the device and what type of flux are you using? You may eridicate the fault by using a more active flux. I assume you are flowsoldering the device as opposed to paste in hole. Do you have an air knife? If so, you could tr