In a message dated 8/20/99 10:15:29 PM Central Daylight Time,
[log in to unmask] writes:

<< Hello
 Everyone.

 I would like to know , is there any spec. on rework open trace on PCB
Level....
 How long of trace open can rework.?
 How mant points can be rework per board?
 etc....

 Ps help me......to answer this question.....

 Best Regard ,
 Nicholas Lai
 8/21/99 >>

Hello Nicholas,

The best place to get some direction on repairs is IPC-700C. It gives
guidelines and instructions on how to do most any repair. What's going to
really determine if you can repair a board, what types of repairs you can do,
how many repairs, etc., is the assembly itself. What does it do? What's the
environment that it will be operating in?
Is it a production board that will be going to a customer? Or is it a
prototype that is just trying to be proved out?

Trace repairs can be kinda' tricky sometimes, using jumper wires may put a
delay in the signal that could cause a high-speed designed board not to
function properly, or cross-talk with other traces or act as a antenna and
create noise in the circuit.

Whenever a board has been damaged, a design engineer needs to determine
whether or not a board can tolerate repairs. The IPC-700C is good to list out
the things that one needs to think about before attempting repairs. If it is
determined that a repair can be made, it also details how to go about it.

Hope this helps,

-Steve Gregory-

##############################################################
TechNet Mail List 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://www.ipc.org/html/forum.htm) for additional
information.
If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or
847-509-9700 ext.5365
##############################################################