Netgear RN21241D – ReadyNAS 2120 1U 4- Bay, 4x1TB Desktop Drive Hardware Manual

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Replace a Fan on a ReadyNAS 3220, 3312, 4220, or 4312
To replace a fan on a ReadyNAS 3220, 3312, 4220, or 4312 storage system:
1.
Remove the chassis cover.
For more information, see 
2.
Disconnect the fan's power connections.
3.
Squeeze the latches on top of the fan and pull up gently to remove the fan from the housing.
4.
Insert the replacement fan into the housing.
5.
Connect the replacement fan's power connections.
If the system power is on, the hot-plug feature causes the fan to start immediately.
Replace the On-Board Battery
Replace the battery only with the same or an equivalent type recommended by NETGEAR. Dispose of used
batteries according to the manufacturer's instructions.
Maintenance
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ReadyNAS OS 6.5