Bill,
This question is perfect for Doug's patented answer " it depends". Can you
or have we made a case where it is acceptable to re-use components? Yes.
Should you, if you have to ask, re-use components? No. Knowing your end-use
requirements and environment is a must, but just the time and money to read
and gather all the things you need to consider before making a decision will
probably exceed the cost to scrap initially.
Dewey
-----Original Message-----
From: Kasprzak, Bill (sys) USX [mailto:[log in to unmask]]
Sent: Friday, June 11, 2004 8:17 AM
To: [log in to unmask]
Subject: Re: [TN] Reusing desoldered components
Daan,
Our policy is to not re-use any soldered parts. I've tried to rationalize
situations instances where this would be feasible, such as prior to powered
up conditions, but can't win support due to a lack of proof that parts are
not over-stressed.
Pragmatically, I think there should be some guidelines for re-using parts,
limited to prior to powered up conditions. The same pundits who argue that
re-use of parts is verboten don't seem to have a problem re-using a board
from which parts were replaced.
Bill Kasprzak
Moog Inc., Systems Group, Process Engineer
-----Original Message-----
From: Dobbs, Marie [mailto:[log in to unmask]]
Sent: Friday, June 11, 2004 10:34 AM
To: [log in to unmask]
Subject: Re: [TN] Reusing desoldered components
Our rule of thumb. If it is removed it is replaced. We have never
conducted any studies on potential heat damage, but. Better safe than sorry.
-----Original Message-----
From: Dehoyos, Ramon [mailto:[log in to unmask]]
Sent: Friday, June 11, 2004 10:27 AM
To: [log in to unmask]
Subject: Re: [TN] Reusing desoldered components
Hi Daan:
I am not aware of any standards for recycle parts, but
wouldn't these parts be in the same situation as reworked parts? Some times
there is a need to move parts due to misalignment or for trouble shooting.
This requires them to go through the reflow process. Just my one cent.
Regards
Ramon
-----Original Message-----
From: Daan Terstegge [mailto:[log in to unmask]]
Sent: Friday, June 11, 2004 7:20 AM
To: [log in to unmask]
Subject: [TN] Reusing desoldered components
Hi Technet,
We've recently had delamination problems on boards which are populated
with some very expensive QFP's. To minimize the damage we want to
desolder these parts and use them again. Our customer wants some kind of
evidence that the functionality and long term reliability are not
affected, and they want this evidence (i.e. thermal profiles) to be
related to IPC specifications.
I'm not aware of any standard that specifies if reuse of desoldered
components is allowed, and which limitations apply to the temperature
profiles, but perhaps some of you knows such a standard ?
Best regards,
Daan Terstegge
Thales Communications
Unclassified mail
Personal Website: http://www.smtinfo.net
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