TECHNET Archives

May 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:
"Thayer, Wayne" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Thayer, Wayne
Date:
Wed, 27 May 2009 09:50:11 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (129 lines)
1. Air convection reflow.
2. RMA
3&4. Axarel 2200 then IPA in soak tanks with circulating pumps.

Thanks!

Wayne Thayer
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Wednesday, May 27, 2009 8:31 AM
To: [log in to unmask]
Subject: Re: [TN] humidity test failure

In order to give you an meaningful answer I think we need Wayne,

In order to give you an meaningful answer I think we need more information from your side.

1. Where the capacitors wave soldered or reflow soldered?
2. What type of flux was used?
3. What solvent was used?
4. What type of cleaning process was used?

Regards,
George
George M. Wenger
Andrew Solutions
Senior Principal FMA/Reliability Engineer 40 Technology Drive, Warren, NJ 07059
(908) 546-4531 (Office) (732) 309-8964 (cell) [log in to unmask]

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kevin Glidden
Sent: Wednesday, May 27, 2009 8:24 AM
To: [log in to unmask]
Subject: Re: [TN] humidity test failure

Looks like whatever it is it may have started from residues leaching from UNDER the component.  The voltage bias and environment would have only
accelerated this.   The solder joints exposed to the cleaning process
look
fine.  You should review your cleaning procedures and perform testing
(IC/SIR) to determine if you are adequately cleaning, rinsing, and drying to remove contaminants from under low-standoff components.  My suspicion is that if that is in fact the case, and you decided to try to conformal coat, the problem would have only manifested itself sooner with conformal coat adhesion problems.  


-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, May 27, 2009 8:00 AM
To: [log in to unmask]
Subject: Re: [TN] humidity test failure

Good Morning!

Half the week down already. That's another nice thing about 3-day weekends; you also get a 4-day work week either prior to, or after the weekend.

I have Wayne's picture posted now. It's at:
 
http://stevezeva.homestead.com/files/C23_Humidity_failure.JPG

Definitely some kinda' junk there!

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne
Sent: Tuesday, May 26, 2009 9:01 PM
To: [log in to unmask]
Subject: [TN] humidity test failure

Hi Technet Gurus!

I have attached a picture of a part responsible for excess current draw during an extended humidity/temperature cycling test. (I copied Steve so he can hopefully post!)

The board was carefully solvent cleaned, but no SIR test validating the process strips all ionic contamination.  The board is in an enclosure where plenty of ionic contaminants are available.

Humidity was supposed to not exceed 90% and was to be non-condensing during cycling.  There were a handful of components which displayed similar deposits on the same circuit board.  These were the only parts biased during the humidity test.  I believe the evidence suggests at least some condensation occurred.  To me the deposits look like salts.
But what do "the experts" think?

Is there any rule of thumb as to humidity levels where we are nuts to try to survive without conformal coating?  Part of the adjacent circuitry contains RF devices and those guys get panic-stricken when told we probably need to conformal coat!

Wayne Thayer

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

------------------------------------------------------------------------------------------------
This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information.  
If you have received it in error, please notify the sender immediately and delete the original.  Any unauthorized use of this email is prohibited.
------------------------------------------------------------------------------------------------
[mf2]


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