Enabling the Service Mode Before Removing the Fan Tray
This procedure describes how you can enable the service mode by using Cisco IOS commands before you
remove the fan tray from the chassis. Enabling the service mode pushes the fans to operate at full speed and
cool the system down sufficiently, allowing the system to sustain temperatures for the duration of servicing.
In a system that is operational, this applies to removal or replacement procedures from the front and the rear.
You do not have to enable this mode if you are removing and replacing the fan tray in a system that is not
powered on.
Starting in the privileged EXEC mode, enter the following commands:
Procedure
Step 1 Switch# configure terminal
Step 2 Switch(config)# service internal
Step 3 Switch(config)# end
Step 4 Switch# test platform hardware chassis fantray service-mode on
What to do next
1. Proceed with the removal or replacement of the fan tray.
2. After the new or replacement fan tray is installed, turn off the service mode:
Switch# test platform hardware chassis fantray service-mode off
Removing the Fan Tray from the Front
When removing the fan tray, keep your hands and fingers away from the spinning fan blades. Let the fan
blades completely stop before you remove the fan tray. Statement 258
Warning
Only trained and qualified personnel should be allowed to install, replace, or service this equipment. Statement
1030
Warning
Installation of the equipment must comply with local and national electrical codes. Statement 1074
Warning
Before you begin
If you are performing this task in a system that is powered on, enable the service mode first. See Enabling the
Service Mode Before Removing the Fan Tray, on page 80
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
80
Removing and Replacing FRUs
Enabling the Service Mode Before Removing the Fan Tray
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