TECHNET Archives

January 2009

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
kwood716 <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, kwood716 <[log in to unmask]>
Date:
Fri, 30 Jan 2009 15:14:34 -0500
Content-Type:
text/plain
Parts/Attachments:
text/plain (179 lines)
Those are gold flakes to add pizzazz to the board.
Just like Goldschläger

http://en.wikipedia.org/wiki/File:Sam%27s_Camera_195.jpg

:)



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan Tempea
Sent: Friday, January 30, 2009 7:56 AM
To: [log in to unmask]
Subject: Re: [TN] Metal particles on the PCB

Thanks to all that responded!

As per the fab, it is Ni and Au, coming from a clogged filter in the plating
bath.

In the end we've managed to brush hard enough to remove the contamination.

Best regards,

Ioan Tempea, ing.
t : 450-967-7100 ext : 244
[log in to unmask]
www.digico.cc
P N'imprimer que si nécessaire - Print only if you must

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849
Sent: Wednesday, January 28, 2009 10:26 AM
To: [log in to unmask]
Subject: Re: [TN] Metal particles on the PCB

Hi Ioan!

Got your pictures finally and have them posted now, they're here:

http://stevezeva.homestead.com/files/Photo_002.jpg

http://stevezeva.homestead.com/files/Photo_004.jpg

I've seen something like this before, and it was caused by overetching which
caused plating slivers. Luckily, we found these before we populated the
boards. We rejected the boards back to the fab vendor and had them replaced
for new ones. We rejected them because of the possibilty that minimum
electrical clearances were being violated.

Steve

----- Original Message -----
From: "Ioan Tempea" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, January 27, 2009 1:48 PM
Subject: [TN] Metal particles on the PCB


Dear Technos,

I have these PCB shaving a lot of small, but visible with unaided eye, Au or
Cu particles on them, all over. I have sent Steve a couple of images, but in
the mean time I would like to state my questions.

As per IPC-A-610D, 10.4.2, this is a defect condition. The exceptions at
5.2.6.1 say this would be acceptable if the particles were entrapped in
flux, which is not the case.

Big part of the litter goes away if wiped with alcohol soaked cloth, but not
all. Brushing will not remove the leftovers, which seem to be well attached
to the soldermask, but a solid nail scratching will.

First of all: is this a defect?
Secondly, are there any better methods to clean than what I have tried?
Plasma and other funky methods are not an option and solvent cleaning is
probably not either, since the boards are already populated on one side with
no-clean flux.

Thank you,

Ioan Tempea, ing.
Ingénieur Principal Fabrication / Sr. Manufacturing Engineer 30 ans déjà! -
Already 30 years!
950 rue Bergar, Laval, Québec, H7L 5A1
t : 450-967-7100 ext : 244
Mtl : 514-990-5762
f : 450-967-7444
[log in to unmask]
www.digico.cc <http://www.digico.cc/>
P N'imprimer que si nécessaire - Print only if you must


---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------

This e-mail and any files transmitted with it may be proprietary and are
intended solely for the use of the individual or entity to whom they are
addressed. If you have received this e-mail in error please notify the
sender.
Please note that any views or opinions presented in this e-mail are solely
those of the author and do not necessarily represent those of ITT
Corporation. The recipient should check this e-mail and any attachments for
the presence of viruses. ITT accepts no liability for any damage caused by
any virus transmitted by this e-mail.

---------------------------------------------------
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
-----------------------------------------------------

---------------------------------------------------
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
-----------------------------------------------------

ATOM RSS1 RSS2