Cisco ASR 903 Hardware Installation Manual page 59

Chapter 3 Installing the Cisco ASR 903 Router
Caution The router can stay active for up to five minutes if the temperature is below the ambient limit. However,
in the event of an overtemperature alarm, the router can shut down in less than five minutes. In the event
of a critical temperature alarm, the router shuts down immediately.
To avoid erroneous failure messages, allow at least 2 minutes for the system to reinitialize after the fan
Caution
tray has been removed or replaced.
Follow these steps to remove and replace the fan tray on the Cisco ASR 903 Router:
Using a No. 2 Phillips screwdriver or your fingers, loosen the captive installation screw that secures the
Step 1
fan tray to the chassis.
screws.
Figure 3-12
Captive
installation
screw
Handle
Grasp the fan tray handle with one hand and the outside of the chassis with the other hand.
Step 2
shows the front of the fan tray, including the handle.
Caution
OL-25178-04
Figure 3-12 shows the front of the fan tray, including the captive installation
Detaching the Fan Tray
FAN TEMP
CRIT MAJ MIN
ALARM
The fans are exposed on the left side of the fan tray. Keep your fingers, clothing, and jewelry
away from the fans. Always handle the fan tray by the handle.
Cisco ASR 903 Router Hardware Installation Guide
Installing the Fan Tray
Figure 3-12
3-9