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Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
OL-32185-02
Chapter 5 Install and Upgrade Internal Modules and FRUs
Replace a Fan Tray
Replace a Fan Tray
The Cisco 4000 Series ISRs have hot-swappable fan trays that are field replaceable units (FRUs). The
fan tray includes all router fans in one assembly. If a fan fails, replace the tray using a flat-blade or
Phillips screwdriver.
Note The Cisco 4331 ISR and Cisco 4321 ISR do not have hot-swappable fan trays.
Before Hot-Swapping a Fan Tray
Before hot-swapping a fan tray, read the safety precautions below.
• Read the entire procedure and have the required tools available.
• Do not attempt the hot-swap in ambient air temperature above 90°F (32°C).
• Do not attempt the hot-swap at an altitude above 6000 feet (1829 meters).
• When the router is being operated, we recommend to change the fans in the router within 2 minutes
to ensure the router does not overheat:
Replace Fan Tray
Note If hot-swapping the fan tray, we recommend to complete the operation within two minutes to ensure the
router remains within operating temperature.
Note We recommend that you change the air filter every 3 months. However, examine the air filter once a
month (or more often in dusty environments) and replace it if it appears to be excessively dirty or
damaged. To comply with Telecordia GR-63-Core standard air filter requirements for NEBS
deployment, the air filter must be replaced, not cleaned.
Step 1 Remove the bezel. The bezel is secured with snap latches. To remove the bezel, hold the top and bottom
and pull the bezel.
Step 2 Completely loosen the three captive fan tray screws.
Step 3 Pull the fan tray out.
Step 4 Insert the replacement fan tray and tighten the three captive screws.
Step 5 Replace the bezel.
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