Electronics Forum | Wed Sep 18 16:56:55 EDT 2002 | stockley
I started writing a long winded explanation about SMEMA and realised that it is just as easy to write about this as it is to talk about it on the phone. It just so happens that I have recently gone through this process so I believe that your vendor
Electronics Forum | Wed Sep 18 22:53:24 EDT 2002 | davef
Please give us background on your situation, so that we can focus on the specifics, for instance: * This is a bare board problem, correct? Then, this contamination causes what the problems in your process? * What is the type [ie, FR4, CEM1, etc] of
Electronics Forum | Thu Sep 19 02:45:33 EDT 2002 | bugsjoe
Thank you ur reply Dave. Let me explain our COB workflow: 1. unpack PCB (FR4,LPI,HASL)(the thickness of gold and nickel we can't be find)(No SMT before) 2. clean the pcb by rubber 3. blow the pcb by di-ionic gun 4. attach die by adhesive gel 5. cure
Electronics Forum | Fri Sep 20 14:23:50 EDT 2002 | larryk
PizzaFred, Scott mentioned lots of good ideas. Take one of your boards to each vendor and see what it takes to program the board how long it takes for it to become online. I've found some that are easy to program, but require 40 or more assemblies to
Electronics Forum | Mon Sep 23 13:08:47 EDT 2002 | dragonslayr
Daan has made a valid point with regards to expertise and use of a machine. Yet I recognize that with advanced technology, trades must occur. A hghly sophisticated AOI unit can and will help reduce overall cost of production. Therefore, a need to ha
Electronics Forum | Tue Sep 24 07:32:58 EDT 2002 | cyber_wolf
Pete: It is a Panasonic Camera. MPM tells me that they no longer sell parts for that vision system, and in order to fix this problem I have to do a vision up-grade. The upgrade is over 20K if I remember correctly. That is not going to happen. I hav
Electronics Forum | Fri Sep 20 17:41:09 EDT 2002 | davef
Neither. It would be better if the person posting thread said, "I searched the fine SMTnet Archives, but couldn't find an answer to my question. Now, here's what I'd like to know ... " Barring that, it would be better to start a new thread, becaus
Electronics Forum | Mon Sep 23 03:12:01 EDT 2002 | surachai
We encounter this problem also , I know that it 's acceptable per IPC standard but sometime it fail at ICT and FCT , then this problem should be prevent , we found it with QFP 16 mil pitch and the defect looklike negative wetting at the front of lead
Electronics Forum | Wed Sep 25 10:22:21 EDT 2002 | matt2138
UltraSonic cleaners do a good job of cleaning both stencils and misprint PCBs. Make sure the frequency that the machine comes set to is ok to use with both stencils and misprint PCBs. If you are a CM make sure your customers are ok with using the ul
Electronics Forum | Wed Sep 25 13:12:25 EDT 2002 | dragonslayr
Dave (and Brian) - OK, following the logic of your post above sounds good. I now have questions. How would a user know to follow your suggestion? Especially a newbie? How would a new posting be titled so that it has relevance to a "locked" thread?
