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