Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Assembly Revision Control

#25654

Assembly Revision Control | 5 September, 2003

Hello,

We're an EMS provider doing low volume/high mix production. We've found a hole in our ECO and revision control systems that needs to be fixed.

Within our ERP system, whenever possible, we try to keep the customer rev of an assembly as our internal rev using a single digit letter or number. Problems arise when we need to do a simple ECO involving the BOM (non- form, fit or func.). We use what we call a "No Bump" ECO where a change can be made without rolling the assembly rev. The problem this creates is obvious. We could have 2 BOMs on the floor with the same rev but different contents.

One solution we see is to make our assembly revision 2 digits with the first digit indicating the customer rev and the second an internal rev. Our ERP system appears to support this scheme. Another possibility would be to maintain a cross reference list of customer to internal revs. The two digit system sounds like a slam-dunk but there are other issues for us to consider.

I'd like to know how other CMs are handling this situation and if there may be another alternative to consider.

Many Thanks.

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MGL

#25655

Assembly Revision Control | 5 September, 2003

We handle this issue by adding a .1, .2 etc after the existing rev. Ex. Rev is A - we do an internal Rev changing an item and it goes to Rev A.1 - Basically you are building a Rev A with that ECO applied to it. It works well but you need to pay attention to detail.

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Andrea

#25656

Assembly Revision Control | 5 September, 2003

What about making the customer drawing or parts list with their rev as a part number on your parts list? Example: (455556 rev X) would be a part number on your parts list.

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masm

#25676

Assembly Revision Control | 9 September, 2003

> What about making the customer drawing or parts > list with their rev as a part number on your > parts list? Example: (455556 rev X) would be a > part number on your parts list.

What about keeping their revision as A, B, C and in your system it would rev as 1,2, and so forth. This kind of keeps everything seperated. Anytime we have any change to a product we rev our number. Hope this helps some.

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#25677

Assembly Revision Control | 9 September, 2003

You can always add a second level of control. We used a document that lists all configuration codes that reflected these types of changed. For instance, code 001 reflects Dwg. Rev. A, and ECO A1 and DVR 4234. Code 002 reflects Dwg. Rev. A, and ECOs A1 and A2. They are both listed on the document, and it's up to Config. management to tell manufacturing which to use, and when. Each dash # of the assembly had it's own sheet. In our case, dash #s only changed with changes to the bare board fab.

This "Documentation Reference Sheet" is released to manufacturing whenever a new ECO or deviation is implemented in manufacturing. You could be building an 001 and an 002 at the same time. The doc. package traveling with the lot will carry a copy of the DRS, as well as tracking docs. that reference the config. code.

Note this was Class 3 medical devices...YMMV.

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Dominador Sagun

#25725

Assembly Revision Control | 12 September, 2003

Run a deviation until next customer ECO.

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