Acer AR360 F1 - Manual (Page 59)

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4 Push the new power supply module into the power bay until it
clicks into place.
5 Plug the AC power cord back into the module and power up the
server by pushing the power on button.
Replacing a system fan
The system has four high-performance PWM fans to provide the
cooling for the system. Fan speed may be controlled by a setting in
BIOS (see Chapter 4).
To replace a fan module:
1
Perform the pre-installation instructions described on page 27.
Warning! The system fan becomes very hot when the system is on.
Allow it to cool off first before handling.
2 Remove the top chassis cover while the system is still running to
determine which of the fans has failed.
3 Remove the fan module.
(1) Disconnect the fan cable from the mainboard (1)