> specific names of the IPC coupons, but your fabricator should. Sounds like > you & your QA need a long chat with your fabricator, somewhere there is > something seriously awry. > > Sincerely, > Brad Velander.
He was sued & had to pay for my company's loss. I'm just trying to avoid such a problem in the future. Q: Where can I get the IPC coupons? ____________ Brian Guralnick [EMAIL PROTECTED] (514) 624-4003 ----- Original Message ----- From: "Brad Velander" <[EMAIL PROTECTED]> To: "'Protel EDA Forum'" <[EMAIL PROTECTED]> Sent: Monday, December 16, 2002 3:00 PM Subject: Re: [PEDA] PCB Layout Tricks to help identify Lemmon PCB's. > Brian, > yes there are various IPC coupons that can be used for all of your > issues. However in order to proper inspect those coupons you will have to > have the fabricator perform microsections (as opposed to you having to > "slice" the board) for you to verify the build. Sorry I don't know the > specific names of the IPC coupons, but your fabricator should. Sounds like > you & your QA need a long chat with your fabricator, somewhere there is > something seriously awry. > > Sincerely, > Brad Velander. > > Lead PCB Designer > Norsat International Inc. > Microwave Products > Tel (604) 292-9089 (direct line) > Fax (604) 292-9010 > email: [EMAIL PROTECTED] > http://www.norsat.com > > Check out our fall promotion at www.norsat.com. Limited quantities. Sale > ends December 24, 2002. > Contact your Account Manager or call 1-800-NII-4LNB or email > [EMAIL PROTECTED] > > > > > -----Original Message----- > > From: Brian Guralnick [mailto:[EMAIL PROTECTED]] > > Sent: Monday, December 16, 2002 11:07 AM > > To: Protel EDA Forum > > Subject: [PEDA] PCB Layout Tricks to help identify Lemmon PCB's. > > > > > > Hi Everyone, > > > > Last year, I had a run of 1000 PCB's (4 layer) where 80% > > initially passed QC, then 90% of the pass PCBs failed after a few days > > of use. After exhaustive investigation, I cut right through > > the PCB with a huge pair of scissors. It turned out the PCB's middle > > layers had around 25% the normal copper thickness & all the > > traces where also around -4 mil in some areas. > > > > Are there any tricks, test patterns where I could easily > > determine the following for a 16 layer PCB panel without having to > > slice up the panel: > > > > 1) Alignment of each of the middle layers. > > 2) Vertical thickness of the copper on the middle layers. > > 3) Horizontal thickness of the traces on the middle layers. > > 4) Drill hole alignment for all of the layers. > > > > > > Thanks, > > Merry Christmas, Happy New Year. > > ____________ > > Brian Guralnick > > [EMAIL PROTECTED] > > (514) 624-4003 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
