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March 2012

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Subject:
From:
"Goodyear, Patrick" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Goodyear, Patrick
Date:
Wed, 7 Mar 2012 16:57:59 +0000
Content-Type:
text/plain
Parts/Attachments:
text/plain (58 lines)
 the mail server stripped the attachments, where do I send them?

pat

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Wednesday, March 07, 2012 8:20 AM
To: [log in to unmask]
Subject: Re: [TN] Damaged board traces,

Rubs are definitely mechanical in nature.   The leads are not clinched.   Here are a couple of pictures.  

pat 

-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Wednesday, March 07, 2012 4:58 AM
To: 'TechNet E-Mail Forum'; Goodyear, Patrick
Subject: RE: [TN] Damaged board traces,

Wow! 40-year old boards and it's the first time they're being used...I guess they really are what you would call legacy boards.

Are the leads clinched? Although I don't think it is something with auto-insertion equipment, but you never know. Can you take a couple of pictures?

Steve

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Tuesday, March 06, 2012 5:34 PM
To: [log in to unmask]
Subject: [TN] Damaged board traces,

Working on single sided legacy boards, I finding half moon rub marks on the
traces adjacent to pads, about 0.15" (3.5mm) away.    They are  circular in
nature (half moon shape) on the edges of the traces.   Definitely
mechanically made.   These boards are roughly 40 years old and have never
been used.  I'm inspecting them prior to installation.
Anyone know of any OLD process that could make these types of marks.  I have inspected 4 boards and find the same types of deformation on all of the boards although not in the same places.

   I suspect the boards were originally hand soldered, as there is no solder mask on the runs and they are plated with no excess solder clinging to them.

   pat


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