Verify the air flow direction when installing the new air filter. An air flow direction arrow is stamped
on the air filter frame and should be pointing towards the chassis and be visible when installed in
the air filter cover.
Note
a) Slide the new air filter into the slot.
b) Tighten the two captive screws on the front of the air filter cover.
Removing and Replacing AC or DC Power System Components
This section contains removal and replacement procedures for the AC and DC power systems used in the
Cisco ASR 9901 Router and Cisco ASR 9001 Router.
Power Module Replacement Guidelines
The Cisco ASR 9901 Router and Cisco ASR 9001 Router support online insertion and removal (OIR) for
power modules. If you are replacing a redundant power module, you can remove and install the power module
while the system remains powered on without causing an electrical hazard or damage to the system. This
feature enables you to replace a power module while the system maintains all routing information and ensures
session preservation.
However, to maintain operational redundancy and proper cooling, and to meet EMI compliance standards,
you must have at least one working power module installed. When you remove a failed power module with
the router in operation, perform the replacement as soon as possible. Make sure you have the replacement
power module ready before beginning the removal and installation procedure.
Removing and Replacing an AC or DC Power Module
This section contains the procedure to remove and replace an AC or DC power module from the chassis.
It is not necessary to turn off the switch on the unit to remove individual power modules. Power modules
support OIR, so they can be removed and replaced with the power on and the system operating.
Note
Removing an AC or DC Power Module
To remove an AC or DC power module from the chassis:
Procedure
Step 1 Disconnect the power cabling from the power module before removing it from the chassis.
Step 2 Pull the keying lever towards the left side to unlock the module from the chassis.
Step 3 Slide the power module out of its bay while supporting it with your other hand.
Cisco ASR 9901, ASR 9001, and ASR 9001-S Routers Hardware Installation Guide
137
Replacing Router Components
Removing and Replacing AC or DC Power System Components
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