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July 2008

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Subject:
From:
Guy Ramsey <[log in to unmask]>
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Date:
Wed, 2 Jul 2008 08:21:34 -0400
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Yes. 
What kind of cleaning process?
How do you evaluate the cleaning process results?
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Tuesday, July 01, 2008 6:26 PM
To: [log in to unmask]
Subject: [TN] Electrical Test Failures

Fellow TechNetters I Really Need Some Help:

I'm having a problem with a mixed technology PCB failing E/T for low voltage
leaking.? The SMT components are mostly R's and C's with various I/C's.? The
Thru-Hole components, besides various connectors, are IRF4905, Thru-Hole.?
The SMT solder paste is aqueous and our process calls for three separate
washes.? The PCB solder resist is LPI with a dull, matte finish.? Has anyone
with aqueous experience ever had a problem with paste/washings leaving any
type of residue which can cause a leakage problem?

I thank all you folks in advance for your assistance.

Bill Black
Medco
Tel?? 1 631 667 9699.?

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Technet Mail List provided as a service by IPC using LISTSERV 15.0
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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
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