3Com 3CB9EF User Manual

Chassis Fan Tray Removal
and Replacement Guide

For the Switch 4007R 8-Slot Chassis

This guide describes how to remove and install a fan tray (Model Number
3CB9EF) for the Switch 4007R 8-slot chassis.

WARNING: The Switch 4007R fan tray must be installed and removed
only by trained service personnel.

You can install a new fan tray in your Switch 4007R chassis while the
power is on (which is referred to as hot swapping).

Fan Tray Description The Switch 4007R chassis and its modules are cooled by fan trays. The

8-slot chassis contains two fan trays, each of which contains three fans
(Figure 1). Four fans cool the switch fabric modules, interface modules,
and management modules and the two fans cool the power supply bay
area.

http://www.3com.com/

Part No.10014113
Published February 2002

2 Chassis Fan Tray Removal and Replacement Guide

Figure 1 Location of Fan Trays in the Rear of the Switch 4007R 8-slot Chassis

Module and
power supply
fan trays

Spring-loaded
screw

There are no user-serviceable parts on the fan trays. If these components
fail, remove them as described in this document and return the
components to your supplier. Keep replacement fan trays at your site so
that they are available if needed.

To be able to remove and replace a fan tray, and for proper ventilation, keep
the rear of the chassis at least

91.4 cm (36 in.)

from any obstruction, such as

a wall or another rack.

Chassis Fan Tray Removal and Replacement Guide 3

Removing a Fan Tray To remove a fan tray from the Switch 4007R 8-slot chassis, follow these

steps:

1 Using a flat-blade screwdriver, loosen the six spring-loaded screws that

attach the fan tray to the rear of the chassis (Figure 2).

Figure 2 Location of the Six Fan Tray Spring-loaded Screws

Spring-loaded

screws

2 Grasp the two handles on the fan tray, and firmly pull the fan tray toward

you (Figure 3).

4 Chassis Fan Tray Removal and Replacement Guide

Figure 3 Removing the Fan Tray Using the Handles

CAUTION: Before you completely remove the fan tray, wait until all the
fans in the fan tray stop rotating.

Carefully pull the fan tray straight out from the chassis, making sure that you

3

do not damage the connector and guide pin on the rear of the fan tray
(Figure 5).

Fan tray

handles

Installing a Fan Tray Follow the instructions in this section to unpack and install a new fan tray.

Unpacking

To unpack a fan tray:

1 Open the shipping box and remove the fan tray.

2 Inspect the fan tray for damage. If the fan tray, its connector, or its guide

pin (Figure 4) appear to be damaged, repack the fan tray in the shipping
box and contact your local supplier.

All shipping boxes are reusable. After you remove all contents, replace
the packing materials and store the box for future use.