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Forum Discussion
Moving CPU fan connector to IO card from Mobo
I am working on my Biz Pro system that died after a couple quick reboots following a power outage that lasted longer than the UPS did. When researching the issue, I found this article:
https://kb.netgear.com/12240/Service-Action-for-x86-ReadyNAS-Pro-CPU-fan-speed-control#
It mentions some systems were wired wrong, i.e. the CPU fan connects to a 4-pin connector on the MOBO, and instead, should be wired to the IO card to get fan control based on CPU temp vs. running at full speed.
The article doesn't explain how to connect a 4-pin connector with 4 wires in it to a 3-pin connector, i.e. one of the four fan wires wouldn't be connected. Surprised that detail was ommitted from the article. I am guessing only 3 are needed, ground, power, and a third one for the speed setting.
The system fan mounted on the back has 3 wires, red, yellow, black. Presumably the red is hot, black is ground, and the yellow for fan speed. The CPU fan wiring is blue, green, yellow, black.
If I don't get this figured out, I will plug the connector back where it was and pretend I didn't see the article :)
Thanks
1 Reply
What the article fails to point out is that the "some units" it applies to shipped with 3-pin CPU fans. It is intended for those expressly directed to it, not the general public that happens upon it. If your 4-pin fan was running at full speed all the time (which is quite noisy and you likely would have noticed way before you found the article), then you have a different problem. You should not have performed the modification.
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