Somebody said, "these look expensive, I'm sure these others will do".
Or a kinder analysis, "these are on a 16 week lead, I'm sure these
others will do". (exotic mags and integrated solns are usually on a long
If that were the case, the factory has learnt an expensive lession as they
sink the cost of manually reworking 10,000 units.
In my one tiny foray into the world of electronics manufacturing, and IMELE,
one would writ ethe BoM at the protyping stage and built from that.
And amend the BoM as required by tweaks in the prototypes.
After that, in theory, no-one should substitue anything without recourse to
the engineers, unless there are predefined alternatives on the BoM or
OK - that was automotive stuff where field servicing was a PITA and the
product cost more in order to be engineered well.
But all the same, being meticulous about this part of the process is not
that onerous and even though the unit price the cheap, the price of the run
is sodding expensive.
Be interesting if the actual reason becomes known...
"We’ve known about this for four days now, but we haven’t been able to
tell you about it because it meant we had to do some further tests [...]"
hardly rings of openness, what prevented them telling people about it,
regardless of the outcome of the tests?
Yes, but they are going for a very small physical format, so
it does make sense to have that in the socket when the socket
cant be below a particular size and still be an RJ45 socket.
Corse that can bite you on the bum when those special sockets
are hard to source in the volume you require in the time you require.
AIUI, the sockets they needed had the on-board isolating transformers,
etc. (the "magnetics") but the ones the factory fitted didn't - that
resulted in a short to ground on 2 of the incoming Ethernet signal
wires... So no option really, but to remove them and fit the right ones.
Looks like it wa an optimisation on high density components - the
isolation transformers are needed, but do you put them inside the socket,
or on the motherboard PCB...
I think the real world is moving to this high-density approach now anyway
and it won't surprise me if new PCs, etc. are already using these types
So hopefully they've been able to boot them via SD card, perform all the
other tests with just the Ethernet side failing...
The story linked to says they fitted ones *without* a transformer, not
the wrong type with a transformer. The again, it *is* The Register...
The problem hinted at in getting replacements may be finding ones with
transformers that physically fit the space allowed by the makers on the
board for the ones without. If they can't, they've got several thouand
scrap boards on their hands.
On Fri, 09 Mar 2012 13:26:58 +0000, John Williamson wrote:
I don't think I'd actually want any on-board connectors for any kind of
real-world application anyway, because the board would have to go in a
case*, and I don't think it makes good product sense to have connectors
to the outside world on the front back *and* sides.
I'd much rather a connectorless board with solder points for attaching
chassis-mount connectors via trailing cables (of suitable length
according to my intended application / layout) - particularly if the lack
of connectors drops the price a bit!
* even for personal "just hacking about with it" use, I don't like having
operating PCBs running exposed on a bench for any longer than I have to!
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