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Confidential and Proprietary. Copyright © 2020-2021 Ribbon Communications Operating Company, Inc. (''Ribbon''). © 2020-2021 ECI Telecom Ltd.

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Figure 2: Removing the Fan Assembly

Whenever a Fan Assembly is nonfunctional or removed, the speed of the three remaining Fan Assemblies increases to 
compensate for the missing fan.

Insert the new Fan Assembly to the same position.

Tighten the captive fastener to 6 in-lb using the torque driver.
Verify that the Fan Status LED is green. The LED is at the right hand bottom of the Fan Assembly.

Figure 3: Fan Assembly status indicator

Remove the ESD wrist strap from the chassis.
Reinstall the front panel bezel.
From the application, verify that the Fan Failure alarms are not generated.
Verify that the fan failure LED on the front panel is 

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OFF

CRU Storage

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