[time-nuts] HP 5372A Fan
Ed Palmer
ed_palmer at sasktel.net
Wed Mar 10 17:21:12 UTC 2010
Yes, the fan is variable speed and it's 12V DC. It's described in the
motherboard section of the service manual on page 11-4 (pdf page 503).
That's why I thought it was so odd that the fan is blowing cool outside
air over the thermal sensor on the motherboard. I guess they could have
calibrated the system to work on the basis of ambient temperature
variations, but it seems backwards to me.
Ed
Mark Sims wrote:
> Are you sure that it has a variable speed fan? My 5372A has a pretty quiet fan and I have never tried to change it. I am assuming that it uses the same 117V fan as the 5371A. That thermal switch may be a power supply shutdown.
>
> I have a couple of 5371A's that are a different matter. Utterly obnoxious fans. I put in much quieter 12V fans. I powered them with a separate wall wart module mounted inside the box with velcro. I used Nidec Beta V TA450DC fans rated at 250 mA. Again, I checked the before/after thermal environment and found no changes.
>
> I have some even quieter NMB "Smartfans" with a thermal sensor. They draw around 150 mA until the temp reaches 35C, then they kick in at 750 mA and scream bloody murder.
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