Cisco NCS55A1 Hardware Installation Manual page 65

Replace Modules, Fan Trays, and Power Supplies
Replace NCS 5502 and NCS 5502 SE Fans
Cisco NCS 5502 and NCS 5502 SE has fan redundancy protection mechanism against a single fan failure. If
a fan fails, these can work for unlimited time without any performance degrade. When the failed fan is replaced,
the new fan must be physically placed within 10 minutes.
Step 1 Unscrew the thumbscrew on the fan.
Figure 32: Remove NCS 5502 and NCS 5502 SE Fans
Step 2 Pull the handle to remove the fan to be replaced.
Step 3 Hold the fan module with the LED and PID label at the top.
Step 4 Align the fan module to the open fan tray slot in the chassis and press the module all the way into the slot until the left
and right latches click and locked on the chassis.
Step 5 If the chassis is powered on, listen for the fans. You should immediately hear them operating. If you do not hear them,
ensure that the fan module is inserted completely in the chassis.
Step 6 Verify that the fan module LED is green. If the LED is not green, one or more fans are faulty. If this situation occurs,
contact your customer service representative for replacement parts.
Hardware Installation Guide for Cisco NCS 5500 Series Fixed-Port Routers
Replace NCS 5502 and NCS 5502 SE Fans
57