See IPC-R-700C, it has decent methods. We are a class 3
house and have used repaired traces for years under vibration
and temperatures from -55C to +90C. Admittedly we don't
follow IPC by the letter, but you should feel comfortable
replacing foil as long as you adhere it adequately, perhaps
even cover it with a thin layer of epoxy.

Probably the bigger consideration should be cost. For high
volume quick fixes, use an insulated jumper wire rather than
the multiple steps of replacing foil. In harsh enviroments you
will want to adhere the wire to the board and dress it cleanly.
Either way is capable of providing high reliability.

Good Luck
Jeff
>-----Original Message-----
>From:  Ed Holton [SMTP:[log in to unmask]]
>Sent:  Wednesday, March 25, 1998 6:13 AM
>To:    [log in to unmask]
>Subject:       [TN] circuit board trace repair
>
>Many years ago and in a previous life, when I worked at a defense
>contractor, due to the cost of the board, if a trace was broken, etc, it
>was acceptable to repair the trace, provided it was done per the proper
>military specifications.
>
>I have been working in automotive electronics for the past 6 years, and the
>issue of trace repair came up for the first time.  How robust is trace
>repair?  Has anyone ever validated the effectiveness of this repair under
>environmental conditions?
>
>
>Ed Holton
>Hella Electronics
>
>

################################################################
TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c
################################################################
To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body:
To subscribe:   SUBSCRIBE TechNet <your full name>
To unsubscribe:   SIGNOFF TechNet 
################################################################
Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information.
For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311
################################################################