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Subject:	Re: Solder Joint Defects
From:	Nancy Trumbull <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 18 Oct 2001 09:41:53 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (44 lines)

Cathy,
I was in the process of writing almost the same statement as Bob, when I stopped to check and see if any one had answered you yet. I started in this field around 1979. I'm not sure when I picked it up first but I have always heard that 15 to 20% of defects are leaked by visual inspection.
Therefore my action has always been to try and control the process. I will amit that this does get hard sometimes. There are steps you can take to aid with your inspection. As a standard process flow, to always view the part in the same pattern. But I have always been a person that deals with root cause. As you know Leakage perversion will increase as you decrease your defects. Hope I said that right.
Just backing up Bob.
Have a good day
Nancy T.

>>> [log in to unmask] 10/18/01 07:33AM >>>
Could anyone help with this.
When visually inspecting PCBs to class 3, is there an acceptable percentage
of faults missed? Also is there an acceptable defect level considering PPM
with regards to soldered joints.

Cathy Killen
Training Instructor
Smtek Europe Ltd.
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