I agree with Kathy, We typically designate no more than three repairs per
assembly, unless it is a special need, (only one left in existence).
but it depends on the complexity of PWB, cost of PWB, and experience of
repair tech that will govern the number.

Tom



>From: Kathy Kuhlow <[log in to unmask]>
>Reply-To: "TechNet E-Mail Forum." <[log in to unmask]>,        Kathy Kuhlow
><[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] Limits to Lifted Pad/Open Trace
>Date: Mon, 26 Feb 2001 09:01:02 -0600
>
>Typically I have used limitations such as no more than 3 pads or traces per
>assembly as long as the pads and traces can be repaired with a high degree
>of assurrance and per the IPC-7721 guidelines.  I have seen other
>facilities that use the golden number 5 but with no reasoning behind it.
>
>Kathy
>
> >>> [log in to unmask] 02/26/01 03:04AM >>>
>Hi! I would like to know if there are any standards or norms as to how many
>lifted pads and open traces are allowed for repair within a printed circuit
>board. Does anyone know any guidelines to this? I know IPC says that it
>depends on the customer, well most customer don't know or don't say. Hope
>you guys have more quantitative answers here...
>
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