Cisco Systems OL-11497-03 manual Troubleshooting the Cooling Subsystem, See Figure

Chapter 4 Troubleshooting the Installation

Problem Solving with Subsystems

Troubleshooting the Cooling Subsystem

Cisco 12006 and Cisco 12406 Routers have a blower module located on the rear of the chassis, which provides cooling air for the router components.

(See Figure 4-3.)

The blower module receives power and signals though a connector recessed in the blower module. This connector mates with a connector mounted on the PDU. The blower module contains three fans, one connector, and one controller card. There are two LEDs on the blower module faceplate visible at the rear of the chassis.

•Green LED labeled OK—When on, this LED indicates that the blower module is functioning normally.

•Red LED labeled FAIL—When on, this LED indicates that the blower module is not functioning normally.

If the green LED is off and/or the red LED is on, check the following to help isolate a problem with the cooling system:

•Listen for the blower fans. In noisy environments, place your hand behind the blower module to feel for air being forced out the exhaust vents. If the blower module fans are on, the DC voltage from the power modules to the blower module is good.

•If the blower module fans are not on, there could a problem with either the blower module or the DC power from the power modules.

–Check the output power LED on each power module (DC LED on the AC-input power supply; OUTPUT OK LED on a DC-input PEM). If the output power LED on a power module is off, but the input power LED is on, the power module might be faulty and should be checked or replaced.

–If the output power LED on the power module is on (DC output is OK), but the blower module remains off, verify that the blower module is seated properly in the chassis.

Remove the blower module by loosening the four captive screws holding it to the chassis, pull the blower module away from the chassis, then firmly push the blower module against the chassis to reseat the blower module. Tighten the four captive screws.

•If the blower module remains off, there could be a problem with the blower module controller card.

	Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03		4-35