At 12:21 PM -0400 8/15/99, Jon Harahush wrote:
>I recently had my 2400c/180 CPU replaced...out of warranty. aargh.
>
>my S/N is *I57302B8AJN*
>
>I heard something once that the failures could be due to how tight the
>parts are inside the 2400c case?
Probably not, at least in the sense of tight packing. But in another sense
of the word tight, I've often heard that the screws holding the CPU card in
tend to work themselves loose over a long period of time. Once they're
loose, the connector may work partially free, or a screw may fall out
entirely and short something. On other PowerBooks Apple usually uses a dab
of some gunk to keep the screws tight, but for some reason that wasn't done
on the 2400. (Possibly because the 2400 was partially designed and built
by IBM, and IBM may not have followed Apple's usual practice in that
regard.)
Another problem is that it is pretty common for repair techs to do more
than is actually needed to repair the machine. Not because they're bad
people, but because most of them just go down a checklist of things to try.
In this case, a lot of 2400s probably just need their CPU cards reseated
rather than replaced, but by the time a technician gets to the CPU they're
on the "replace CPU" spot in the checklist, and if it works they think "oh
must've been a bad CPU" and send the computer back to the customer with a
new CPU. It doesn't help that it's labor-intensive to disassemble the
2400, and difficult to test it without full reassembly; few techs are going
to do any more cycles of pulling it apart and putting it back together than
they absolutely have to in order to get it running again.
Tim Seufert
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