Electronics Forum | Wed Jun 14 20:05:51 EDT 2000 | Raeto Zryd
Hi Jason, Zero defect is the only acceptable quality!! U need to ask yourself how capable is your process and how well is you quality system set up. No point in setting goals unatainable or beeing forced upon by management if the root problems of th
Electronics Forum | Wed May 21 12:55:35 EDT 2003 | Zhenya
Several things for your reference: 1. Starting with data collection: - Have you done a measle chart to illustrate the pattern of the defect? - Have you checked the corelation between shift/time and defects rate? - How about a pareto chart? - Do
Electronics Forum | Thu Oct 15 10:26:13 EDT 1998 | Dave Celestian
I have a problem with measling on our PCB's. We saw it on our FR4 PCB's at final assembly yesterday. Is this a defect from the board vendor or something we did in our assembly process when building the PCA's (thru hole). Could the wave solder mach
Electronics Forum | Mon May 14 22:24:11 EDT 2001 | davef
The time over liquidous of the profile seems short. But then again, who knows? Based on what you told us, I'm guessing at a board fabrication problem, either measling or delamination. Probably the former, rather than the latter. [Now, we remember
Electronics Forum | Fri Jul 06 10:18:02 EDT 2007 | blnorman
According to IPC-A-600, measling can occur in epoxy-glass boards when the moisture content of the board is above 0.3wgt%. Is this the industy acceptance standard for max moisture content of a board?
Electronics Forum | Thu Oct 15 14:23:31 EDT 1998 | Earl Moon
| I have a problem with measling on our PCB's. We saw it on our FR4 PCB's at final assembly yesterday. Is this a defect from the board vendor or something we did in our assembly process when building the PCA's (thru hole). Could the wave solder ma
Electronics Forum | Mon Apr 14 14:11:30 EDT 2008 | cyber_wolf
I dont know if this is related, but there appears to be a blister/measle in the upper right corner of the Q19 large pad. (upper right of Q19 as you are facing the photo) If your profile and paste is good, my bet would be that there is something wron
Electronics Forum | Mon Feb 02 03:23:26 EST 2015 | alexeis
Hi, Most of our customers perform DNI check. Some of them give a special focus on the issue when it is a new product (NPI) or change version (ECO/ECN). Our customers perform tests on AOI machine and feed the results into a software tool called TopoQ
Electronics Forum | Tue Feb 07 10:11:06 EST 2006 | amol_kane
hi, the only way you can say that the process is in/out of control is to plot the values (mean) of a metric against the 3 sigma limits for a Xbar chart, or plot a individuals run chart. you can also do a capability analysis nased on a metric (say,
Electronics Forum | Thu Aug 09 09:05:09 EDT 2007 | davef
There are no requirements acceptance criteria for baking of board assemblies. What are your customer requirements? The common reasons people choose to bake PCB are to prevent: * Delamination of multilayer boards * Measles, particularly on double si
Products, services, training & consulting for the assembly, rework & repair of electronic assemblies. BGA process experts. Manufacturers Rep, Distributor & Service Provider for Seamark/Zhuomao and Shuttle Star BGA Rework Stations.
Training Provider / Manufacturer's Representative / Equipment Dealer / Broker / Auctions / Consultant / Service Provider
1750 Mitchell Ave.
Oroville, CA USA
Phone: (888) 406-2830
