On Thu, Apr 28, 2005 at 02:10:01PM -0400, Timothy Miller wrote:
>
> Quality is a huge concern. Of course, even in high-end production
> cards, you end up with errata, where found a PCB bug, and, as part of
> the manufacturing process, we have to cut a trace and solder on a
> wire. I loathe that idea, but it's really not so bad if it's made
> into a consistent process, is done properly, and passes all tests.
>
> Bodged boards that work properly are not something you'd want to sell,
> but since they work, no one's going to complain if they get one for
> free. Plus, there are going to have to be a certain number of free
> boards given out ANYWAY. Problem solved. :)
Even in aerospace products, boards have to be shipped with cuts and
soldered jumper wires, to avoid re-spins and meet the schedule. Even with
obsessive design checking, there are all kinds of reasons why this happens.
One of the IPC standards, I forget which one, has acceptability criteria for
wiring on boards. I had to write an in-house standard at my last company to
tighten this up some, to nail down acceptable insulation types to meet the
peculiarities of the production processes and operating environment. Two of
the assemblers helped me qualify a few types of tough fine-gauge hookup
wire, and the stripping tools and staking adhesives to use with them.
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