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7
Installing and Replacing Other Components
8. Slide the chassis tray assembly back into the security platform until it
clicks into place.
9. Resecure the four chassis tray assembly retaining screws.
10. Press the power switch, located on each power supply at the back of the
security platform to turn on the appliance.
Note
Make sure you turn on both power supplies.
Replacing the Fan Unit
The Nokia IP2255 appliance fan tray assembly is a single-unit made up of
four individual fans to provide the air flow required to maintain a proper
operating temperature. The fan unit provides N + 1 cooling, so it can provide
proper airflow even if an individual fan fails.
Caution
To help guard against electrostatic discharge damage, make sure
you are properly grounded by using a grounding wrist strap and
following the instructions provided with the wrist strap before you
handle the components or open the appliance. If you do not have a
grounding wrist strap, make sure you are properly grounded before
you touch any electronic component.
To replace a fan unit, you need:
Physical access to the appliance
A Phillips-head screwdriver
Replacement fan unit and accompanying documentation
96
Nokia IP2255 Security Platform Installation Guide
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