Hi Dacia!

I've got your pictures posted. Look at:

http://stevezeva.homestead.com/files/Resistor_-_Adhesive_Coating_Removed
_-_1.JPG

http://stevezeva.homestead.com/files/Resistor_-_Adhesive_Coating_Removed
_-_2.JPG

http://stevezeva.homestead.com/files/Resistor_-_Adhesive_Coating_Removed
_-_3.JPG

http://stevezeva.homestead.com/files/Resistor_-_Adhesive_Coating_Removed
_-_4.JPG

Funny, they look like they're all in the same place on the board. Was a
board support pin in the wrong place in the screen printer or
pick-and-place machine? Or did these resistors get chipped in a test
fixture or something?

I don't know of any specific standard just for 0402's. I will say that I
know a lot of my customers would have some reservations about accepting
these. It might be another thing if the board was conformal coated. But
that's just my opinion...

-Steve Gregory-

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dacia Schoolfield
Sent: Friday, December 22, 2006 10:01 AM
To: [log in to unmask]
Subject: [TN] Question About Chip Outs on Resistors

All -

I need the forum's help on a quality issue that we are experiencing with
one of our customers.

Specifically, we have a customer that is rejecting board assemblies due
to chip-outs (nicks) in the adhesive coating on various resistors. We
are questioning whether or not these chip-outs in the coating are
actually defects.

IPC-A-610 Rev. D (section 9.2) does state workmanship parameters for
adhesive coating, but it only applies to 1206 and larger devices. The
devices in question are 0402's.

Our question: Is there an industry standard quality/workmanship
specification for adhesive coating on devices with a case size smaller
than 1206?
I will provide Mr. Steve Gregory some pictures to add to his website,
when he has time.

Kind Regards,
Dacia
 <<Resistor - Adhesive Coating Removed - 1.JPG>>  <<Resistor - Adhesive
Coating Removed - 2.JPG>>  <<Resistor - Adhesive Coating Removed -
3.JPG>> <<Resistor - Adhesive Coating Removed - 4.JPG>>


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