3. After the MPA is properly seated, use a number 2 Phillips screwdriver to tighten the captive screws on
the MPA. Ensure that you first tighten the right screw and then the left.
Avoid over torquing the MPA captive screws when installing the MPA. Tighten the captive screws on the
MPA to a torque of 6 +/-0.5 inch-pound.
Note
4. To remove the MPA from the MLC, use a number 2 Phillips screwdriver to loosen the captive screws on
the MPA. Ensure that you first loosen the right screw and then the left.
5. Grasp the MPA and pull the MPA from the MLC. (You have already disconnected the cables from the
MPA.)
Replace a Fan Tray
You can remove a fan tray to either replace it with another fan tray or to replace a fabric cards located behind
it.
The router uses three fan trays but it can operate with two fan trays while you replace one or remove one to
replace one of the fabric cards behind the fan tray. When you remove one fan tray, the other fan trays speed
up their fans to maintain the designed airflow.
If you cannot replace a fan tray within three minutes, we recommend that you leave it in the chassis until you
are ready to replace it.
Note
If you remove more than one fan tray at a time during operations, the router allows up to two minutes of
operations before shutting down unless you replace extra missing fan trays within that time. If the router
senses an over temperature condition when multiple fan trays are removed, the shutdown can occur in less
than two minutes.
Note
To replace a fan tray, you must perform the following functions:
1. Remove the fan tray. For more information, see Remove Fan Tray, on page 107.
2. If you need to replace a fabric card behind the removed fan tray, see Replace Fabric Card, on page 110.
3. Install a fan tray as explained in Install Fan Tray, on page 108.
Watch Replace a Fan Tray (Video)
Remove Fan Tray
Remove only one fan tray at a time during router operations. If you remove more than one fan tray at a time,
the router will shut down within two minutes unless you replace the extra fan trays that you removed within
that time.
Hardware Installation Guide for Cisco NCS 5500 Series Modular Routers
107
Replace Chassis Components
Replace a Fan Tray
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