Mike
I suspect they are referring to 7721 "Repair and Modification of Printed Boards and Electronic Assemblies", and are confusing repair vs. rework. 

Repair is "The act of restoring the functional capability of a defective article in a manner that precludes compliance of the article with applicable drawings or specifications."  For example, gluing a lifted pad back down is repair.  Touching up a joint is rework.

A REPAIR limit of 1 might be reasonable, 7721 states that "The maximum number of repairs per printed wiring board assembly should be determined by the using activity or agency." - i.e. approved by your customer.  We've yet to have a case where we wanted to do more than 1 repair to a board, but we always get customer approval first for all repairs.

A rework limit of 1 solder joint per board is not practical, cost effective, or realistic.  What do you do with a skewed QFP?  A missing chip resistor?  Scrap the board?  

If this was my customer I'd buy them a copy of J-STD-001 and start there.  Well, I might spend some time banging my head on the cubical wall first...

good luck!

regards

Graham Collins
Process Engineer, Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215

>>> [log in to unmask] 09/25/00 09:28AM >>>
Fellow Technets,

A question was posed to me by a customer claiming that
IPC-R-7221 stated that a maximum of 1 rework per board
for class 3 was acceptable.   Specifically they stated
that this means only 1 solder joint per board could be
touched up.  I have been searching high and low for
IPC-R-7221 but to no avail have yet to find the
existence this publication.

My questions are:

1.  Does IPC-R-7221 exist?

2.  If so, can anyone support or refute the claims of
only being able to touch up 1 solder joint on a class
3 assembly?

Any help or input would be appreciated.

Best regards,

Mike

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