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January 2004

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Subject:
Re: No Of PCB/PWB Rework
From:
Mel Parrish <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 26 Jan 2004 09:37:10 -0600
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Hi Victor,
The reference I recall for the number of allowable rework operations for a given assembly was MIL-C-28809. That being customer and contract driven makes it a little simpler to impose than IPC references which cover many product definitions. There were others, such as WS-6536 which required disposition after a single rework attempt for individual connections. That reference being based as I recall upon the number of thermal excursions that the printed circuit should be expected to endure without reliability impact more so than the component considerations you mentioned. 
Often the resulting product disposition would transition between the definition of Rework as opposed to Repair which required further contractual considerations such as price, or use restrictions such as non-flight. 

Mel Parrish
Madison, AL
256 705 5530
[log in to unmask]
www.solderingtech.com
 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Victor Hernandez
Sent: Monday, January 26, 2004 6:19 AM
To: [log in to unmask]
Subject: [TN] No Of PCB/PWB Rework


Fellow TechNetters:

  What is IPC Standards guideline for the number of time PTH Components can
be rework
without compromising the Product QUALITY and Reliability of the product.
Many times
the product can not be sold as NEW with an X number of components
replacement.   It
can be sold as EQUAL To NEW.   In a previous life we used # as the magic
number.


Victor,

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