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September 2001

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Subject:
From:
Jack Crawford <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 18 Sep 2001 13:19:43 -0500
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>>> Rich Lasko <[log in to unmask]> 09/18/01 12:56PM >>>
Good afternoon everyone,

We have been doing some smaller qty prototype or very low volume production
runs (Qty 5-10pcs) on our SMT equipment.  We have been encountering some low
yields at the SMT inspection for this type of production/prototype runs
(They are nearly fixing each board for some reason or another).  The
feedback that I am getting from that department is that they can not
accurately "tweak" the process with this low number of qtys (by the time
they get close to having the machine programs set, they have completed all
the boards in that order).  So the next time we run the job, we continue to
"tweak" the process in order to improve the yields.

What this has caused us is some continuous rework at the end of the SMT line
repairing the slid, shifted, or tombstoned components or incomplete solder
reflow.

Have any of you encountered a similar type experience and if so how was it
handled in order to improve the yields?

Thanks in advance for your help on this matter.

Rich Lasko
Badger Electronics

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