In the reading I have done, configuration books and IPC they say, "Each
document has its own revision assignment and level".
I have implemented here that minor changes to the documents only receive a
revision with a number.  Our people were getting confused it the assembly
drawing was REV B but the card fab was rev A. By appending a number to the
letter all concerning docs a card have the same alpha but may have a
different suffix number.  The revision block must be filled out.  Our old
archive system didn't allow this since it could only handle one character
in the revision area.  Now everything is stored electronically and the name
can be long.  Things have been much easier to track.

The initial board fab is
Dwg MNSN-EL-04-1001  Rev - with artwork MNSN-EL-04-3001 Rev -
No changes to either of these documents

The assembly drawing is  (document does not reference the rev of BOM)
MNSN-EL-04-0001 r2

The BOM
MNSN-EL-04-4001-001 r5  (5 changes to the document) (document does not
reference rev of assembly drawing)

When a card fab is revised everything goes to  Rev A then if the assembly
drawing or BOM have changes beyond that they would start at A1 and go up
consecutively until another card fab change.

Good Luck!

Dee Stover  [log in to unmask]
Sr. Tech Associate Elect
National Optical Astronomy Observatories
www.noao.edu

At 12:19 PM 10/7/2005 -0400, you wrote:
>The company I work for is going thru some documentation change
>discussions.
>Below are the documents that are revisable. (The parts list contains all
>the IC's, cap, res. etc. and documents.)
>The feedback I'm getting is the the parts list and the assembly drawing
>should ALWAYS be the same revision (becasue thats the way its always
>been).
>Everywhere I've every worked, these are independent documents.
>
>Here are my scenerio case: (All documentation released at Rev. A)
>
>Scenerio (Rev: B): A  part number change, of a 1K, 5%  resistor to a 1K,
>1% resistor.
>In this case, the part list and schematic would change, but it has no
>effect on the assembly (because no part number or value is on the assembly
>drawing).
>
>PL1234567-1             Rev:    B       Parts List
>         AW1234567       Rev:    A       Assy Dwg
>         DS1234567       Rev:    A       Drill Dwg
>         PC1234567       Rev:    A       Artwork
>         PA1234567       Rev:    B       Schematic
>
>Scenerio (Rev: C): The length of the screw holding the stiffener bar is
>changed from 3/8 in. to 1/2 in.
>The change is to the parts list only, the assembly drawing stays the same.
>(no 3D view or side view)
>
>PL1234567-1             Rev:    C       Parts List
>         AW1234567       Rev:    A       Assy Dwg
>         DS1234567       Rev:    A       Drill Dwg
>         PC1234567       Rev:    A       Artwork
>         PA1234567       Rev:    B       Schematic
>
>
>The current discussion and question is;
>-Can the parts list be independently revisible, from the assembly drawing?
>-What do most of the assembly houses usually like?
>
>
>Thanks for any response to this question.
>
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