Jack,
I thinking the build is as follows:
2 cap cores made with 4 plies 7628 glass drilled (possibly not drilled),
plated, etched and then bonded together with what looks like 2 plies
7628 in the centre and 1 ply 1080? each side for fill properties.
I'm guessing then, that the defect is an etching defect on the inner
core side, possibly a lump of stray dry film, or similar which has
prevented plating from taking, including tin etch resist and then after
dry film strip, etched most of the plane away.
Of course, if the build is not as above, then I'm totally in the wrong
direction
Colin
Colin McVean | Production Manager
EMail: [log in to unmask]
Direct Tel: 01903 712926
Direct Fax: 01903 730572
Mobile: 07891 180785
Skype:
Tel: +44(0)1903 712937 Fax: +44(0)1903 730572 Web: www.artetchcircuits.co.uk
Registered Office: Riverside Industrial Estate | Littlehampton | East Sussex | BN17 5DF
Company Registration Number: 1151051 | london VAT Number: GB 918 3589 93 001
Disclaimer: The information in this email is intended only for the person(s) or entity to whom it is addressed and may contain confidential information. If you are
not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose or store or copy the
information in any medium. Any views expressed by an individual within this email, do not necessarily reflect the views of Artetch Circuits Limited.
Any attachment(s) sent with this email are believed to be free from virus, but it is the responsibility of the recipient to make all the necessary virus checks.
Artetch Circuits Limited does not accept any liability for any harm that may be caused to the recipient's system or data by this message or any attachment.
(.....)
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: 07 February 2008 15:33
To: [log in to unmask]
Subject: [TN] FAB: Thin Trace Failures
Has anyone ever seen a cross-section like this?
http://www.frontdoor.biz/PCBportal/opentrace.jpg
(ignore the words on the pic, just a guess)
Can you point me in the right direction for cause?
thanks,
Jack
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text
in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at:
http://listserv.ipc.org/archives
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------
|
