I don't think so...........

Note that the ONLY areas affected are on what appears to be a ground or
power plane connection - so the areas affected would be in the areas of
highest current density.......

So I would be looking for some contamination of the board surface before
mask.......

Note also that contrary to the manufacturers clainms, the area immediately
surrounding each hole does not appear to have been impacted.

I am not an expert on these matters


John Burke

(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Monday, December 04, 2006 8:27 AM
To: [log in to unmask]
Subject: [TN] water water everywhere!

The following files show the two sides of a PCB in a professional
weather station. This shows four dark areas which the manufacturer has
ascribed to water penetration. These are centred on a hole. The whole
thing seems funny to me, as it has happened on only a few of the holes.
I understand that it was housed in a water-tight case, not very far from
the Pacific coast. I was not able to ascertain the laminate type, but it
would not surpise me if it were paper based (FR3?).

Has anyone seen anything like this?

Brian

http://www.realweatherstation.com/FILES/DSCN9441.JPG
http://www.realweatherstation.com/FILES/DSCN9440.JPG

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
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 1.8e
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
-----------------------------------------------------