Nokia IP2255 Installation Guide - Page 97
To replace a fan unit, Loosen the screws by turning them counterclockwise.
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Replacing the Fan Unit Caution Components inside the IP2255 appliance can overheat if they are not cooled even for a short time. If you are replacing a failed fan unit and do not completely remove power to the appliance, do not allow the appliance to run without a fan unit for any longer than necessary. The fan unit is hot swappable, which means you can remove and install the fan unit on the front of the appliance without shutting down the device. To replace a fan unit 1. Locate the fan unit on the front of the appliance and the two retaining screws that secure it to the chassis. 2. Loosen the screws by turning them counterclockwise. 3. Slowly pull the fan unit out of the chassis toward the front. Retaining screws 10Base-SR X2 SLOT 1 A 10Base-SR X2 L RESET CONSOLE A L SLOT 2 AUX 00081 4. If the appliance is running, immediately install a replacement fan unit by sliding it into the security platform. Nokia IP2255 Security Platform Installation Guide 97