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Date: | Fri, 11 May 2012 14:50:50 +0000 |
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Doug,
This was originally my comment. There are several scenarios as noted in the following:
* Printed boards as individual pallets within the manufacturing panel will have pre-routes defined to facilitate removal of the final printed board assembly. These are usually where connectors over-hang or tall components near the edge that would hinder the router on final route out. There could also be internal routing defined. If this is done as an in-process step and followed by final test and a final cleanliness requirement, then there is less of a concern.
* Same as above, except this is done as a post-process step. Handling, the routing process itself and/or assembly could contaminate the printed board.
* Same as above but done at a sub-tier assembly house. This may include the punching, biting, screaming (sorry, wrong story line), scoring or a true engineered pre-route. Concerns are same as above only more-so due to potential unknown or lack there-of critical processing steps. The packaging and re-packaging are added concerns.
* If the final delivered entity is the single printed board image that had pre-routes and a post-route and there are requirements for a final test, final clean, SIR data, IC data or equivalent; then never mind.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Douglas Pauls
Sent: Thursday, May 10, 2012 9:20 AM
To: [log in to unmask]
Subject: [TN] IPC-5703 Question 2
OK, next question.
In our draft outline, one of the commenters (don't know who) indicated
"pre-routing operations" as a potential source of contamination, either
chemical or particulate.
We are not really sure what "pre-routing operations" are. What would you
say that refers to and would that step be a contamination source?
Doug Pauls
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