The only guidance information that comes to mind regarding the
acceptable number of repairs resides in the Appendix of MIL-C-28809.
The number of repairs is limited by the area of the PCB. Although
somewhat dated, the document does provide some useful information. As
pointed out, the reliability of the fielded product needs to assessed to
determine the repairability.
Steve Sauer
Sr. Manufacturing Engineer
Northrop Grumman, Xetron
Cincinnati, OH
513-881-3368 (v)
513-881-3298 (f)
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Friday, April 07, 2006 4:50 PM
To: [log in to unmask]
Subject: Re: [TN] Allowable repairs
Hi Joel!
There isn't a standard on the number of repairs that you can do, one
needs to evaluate how well the assembly is fairing through all the
repairs, keeping in mind what end use the assembly is being used
in...but also deciding if it isn't just cheaper to build it again from
scratch.
I would be concerned about your case. If you're having to run jumpers to
fix multiple broken traces in a flex portion of a board, then I would be
REAL concerned about the traces that haven't broke...like, are they
next?
Next, I would be trying to find out why they are breaking in the first
place. Mis-handling? Poor design application?
-Steve Gregory-
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joel Alexander
Sent: Friday, April 07, 2006 3:19 PM
To: [log in to unmask]
Subject: [TN] Allowable repairs
I have a customer who is asking this question and I did know the answer.
The only references I have observed was on customer prints or
documentation. Can anyone help?
We're searching for a standard (IPC ?) which defines the numbers of
repairs allowed under different circumstances. All I have here is
IPC-7721A, which details repair methods, but doesn't explain the extent
of acceptable repairs.
IPC-A-610 doesn't appear to address this, either.
Checking an IPC catalog, I don't find a document description that fits.
In particular, our test repair group is looking for guidance on how many
jumper wires (to repair broken traces in the flex portion of PIC Data
boards) would be considered acceptable.
Are you aware of standards that define such criteria?
Joel Alexander
APSCO Quality Assurance Manager
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