Re: Dell Dimension 4600C cpu fan dead.

On Sun, 20 Jul 2008 16:25:55 -0700, "David Farber"
<farberbear.unspam@xxxxxxx> put finger to keyboard and composed:

I'm servicing a Dell Dimension 4600 which is shutting down after about 5
minutes. The next time the PC boots, it gives a warning that the previous
time it shut down was due to a thermal problem. That led me to notice
that the CPU fan wasn't turning. The part number of the fan is 9G180. Inside
the fan housing is a small two terminal device. It measures about 6.3k ohms.
Is this an open fusible link,
a thermistor, or something else?

Thanks for your reply.

If it's attached to the heatsink, then I would think it would be an
NTC thermistor. Heat it up with a hair dryer and check for a drop in
its resistance. I think you'll find that temperature controlled CPU
fans are quite common these days.

If the device is a fuse (unlikely), then one end would probably be
connected to the supply pin (or to ground).

You could also bypass the device with a low resistance, say 100 ohms,
if only for testing purposes.

FWIW, here is a pic from the service manual:
http://www.users.on.net/~fzabkar/sffprcs5.jpg

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
.

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