Hi Dark,
The fan that Lambda used was anything but cheaply constructed. It
had steel cased ball bearings, and a fan good signal line. It wasn't
the fan's fault that lambda put the fans at the end of the heat sinks
and sucked the hot air through the fan. It basically cooked the grease
to death.
But, a 115V fan would have still run longer because they typically
have 16W motors, and this 12V fan was only 5W, IIRC. Since the
fan was built into the supply, its load was included in the efficiency
rating of the supply. It had two of these fans per supply, so they
were wasting around 10W out of 2KW in fans.
The supplies I last fixed were in color printing equipment used by
a large local printing firm. They had dozens of these printers, and
each had a half dozen of these power supplies. The supplies went about
5 years before the failures started showing up.
-Chuck
[snip]
Last week one of our servers at work had a bad fan, and one of the
guys pulled it out to replace it. Turned out that the replacement fan
had a foot shorter pigtail, so I had to cut off the old pigtail and
add it onto the new fan with some heat shrink tubing.
So I pulled the blades off the old fan to see what happened, and the
8-pin DIP chip on the PC board was burned up. I didn't do much
further checking because it still stunk like it was burned up.
Anyhow, I don't think that would be a problem with a simpler fan that
used a regular AC motor.
--
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