This is all predicated on the fact that you have a good
validation/functional test after the reflow or solder wave operation. I
would not presume to trust an ICT test (unless you have 99% coverage - and
that is almost an impossibility depending on assembly structure and
topography). Plus, as not all functional tests are created equal, there is
still a valid need for a visual inspection with potential rework at some
point before a final audit of the product is performed.
Visual inspections may not to be implemented until you reach a specified
failure threshold, but they do serve a good purpose to pick up the slack
from equipment anomalies, hand solder mistakes and other nonconformities.
Unfortunately, as long as there are people handling product or performing
hand operations to the product (with or without a soldering iron), and aging
equipment there will be a valid need for visual inspections at certain steps
in the manufacturing process, with subsequent rework and re-inspection.
Dale Ritzen, CQA
Quality Manager
Austin Manufacturing Services
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Dobbs, Marie
Sent: Wednesday, December 03, 2003 2:43 PM
To: [log in to unmask]
Subject: Re: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
My two cents
I would recommend 100% inspect on all boards after they fail, if they fail
testing. To pay an employee to sit and look at a board 100% after a machine
operation is a huge Non-value activity, and the Annual dollar value.
Marie
-----Original Message-----
From: John Parsons [mailto:[log in to unmask]]
Sent: Wednesday, December 03, 2003 3:36 PM
To: [log in to unmask]
Subject: Re: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
Bev,
Thanks for the input. I have yet to evaluate the actual amount of rework
per board or per lot but right know I am questioning the necessity of the al
process of 100% inspecting the boards after reflow prior to second stage
operations.
John
-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]]
Sent: Wednesday, December 03, 2003 12:06 PM
To: TechNet E-Mail Forum.; John Parsons
Subject: RE: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
John,
Avoid at all costs. Every time a human takes a soldering iron to a board
you run the risk of decreasing the reliability of the finished product.
Rework should never be a "standard process step after smt". This does not
mean it never happens, but not every board, every day.
regards,
Bev Christian
Research in Motion
-----Original Message-----
From: John Parsons
Sent: December 3, 2003 2:52 PM
To: [log in to unmask]
Subject: [TN] Touchup - We don't need no stinkin' touchup! Or do we?
Greetings all,
I have moved on from my old life in the fabrication business to learn some
new things in the contract manufacturing sector. My first question to the
group in this new role is on the subject of touch-up as a standard process
step after smt placement and reflow. Does everyone do this or can it be
eliminated by process control during placement and reflow? I personally
don't much care for non-value added processes but was just wondering what
the general feeling out there was.
Regards
John Parsons
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