Re: Maybe the CF should die?

In article <sKvEe.5357$p%3.30347@xxxxxxxxxxxxxxxxx>,
SMS <scharf.steven@xxxxxxxxxxx> wrote:
>Brion K. Lienhart wrote:
>
>> I really doubt that there's any "fuse" at all. From my experience as a
>> computer repair tech, customers that know what they're talking about are
>> few and far between. He probably needs a new main controller board, but
>> doesn't know what that is, so he said "fuse".
>
>It's very possible, though miniature, surface mount fuese are widely
>used on electronic equipment. Usually they are used in applications
>where they are highly unlikely to ever blow; they're there for
>regulatory issues.

I could see a fuse, in combination with a zener diode, being
used to protect the solid-state flash sync circuitry from a reversed
polarity or over-voltage. (Some PC flash cables have unkeyed two-pin
connectors on the flash unit end of the cable.)

The same for an external power connector, or for a USB port
(which provides power).

I know that there is a fuse on most Sun SPARCStations to protect
the keyboard/mouse port from a cable wired for a different system (such
as the (now defunct) Solbourne, which uses the same keyboard connector,
and a SPARC CPU, but which has a mutually incompatible keyboard wiring
-- the keyboard from either machine will blow the fuse on the other. :-)
The older ones with AUI network connectors also had a fuse for that, as
the AUI port needs to power a transceiver.

Earlier machines used a bi-pin fuse for the task, which was
easily replaced. Later ones use a SMD (Surface-Mounted Device) fuse,
which is not considered to be user replaceable.

Enjoy,
DoN.
--
Email: <dnichols@xxxxxxxxxxx> | Voice (all times): (703) 938-4564
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