You don't need additional coupons to tell you it is not aligned. The whole
panel is a coupon when you view the cores after inner-layer imaging, I could
never understand why they would add "more coupons" to tell you what your
eyes or AOI will tell you when inspecting the usable image. Just put the
core layers on a light table and in 5 seconds you can tell if it is
registered, in what orientation any mis-registration might be, etc. 

Just look at your A or B coupons, if you see quarter moon shaped images
where the pads do not align correctly, there is your shifting..... just my
opinion of course.

Franklin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ted Tontis
Sent: Wednesday, July 09, 2008 4:08 PM
To: [log in to unmask]
Subject: Re: [TN] PCB Inner layer shifting

5) How would you know if you have inner layer shifting? 

Take a look at IPC 2221A, table 12-1 and figure 12-14 show registration
coupons that could be used.

http://members.ipc.org/committee/drafts/7-11_d_Coupons.pdf

Ted T 

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