Obtaining Technical Assistance; Product Overview - Cisco 7000 Series Replacement Instructions Manual

Obtaining Technical Assistance

Product Overview

2Cisco 7000 Air Filter and Chassis Blower Replacement Instructions
This document contains instructions for replacing the Cisco 7000 chassis blower
(MAS-7KFAN) and air filter (ACS-7KFILTER). It also provides the procedures for
replacing and periodically cleaning the air filter in the bottom front chassis panel. If you
encounter problems that you are unable to resolve, contact a service representative or the
Technical Assistance Center (TAC) for assistance. You can phone the TAC at
800 553-2447, or send e-mail to
Before you contact a service representative, have the following information ready:
Date you received the Cisco 7000
Chassis serial number (located on a label on the right rear deck of the chassis)
Type of installation or upgrade you are performing (replacing the chassis blower or
cleaning the air filter, for example)
Title and Doc. No. of this document (from the front page)
Brief description of the problem you are having
Brief explanation of the steps you have taken to isolate and resolve the problem
Maintenance agreement or warranty information
Refer to the Cisco 7000 Hardware Installation and Maintenance publication for complete
system installation and startup procedures, and for physical descriptions of chassis
components.
This section provides brief physical and functional descriptions of the chassis blower and
air filter. Figure 1 shows the front of the chassis with the top and bottom front panels
removed to show the internal components.
The system blower provides cooling air for the Cisco 7000 internal components. The
blower is located on the bottom left of the chassis interior when viewed in the
orientation shown in the Figure 1. The blower draws air in through the air filter (which
is not shown in Figure 1) and directs it up through the floor of the internal slot
compartment and over the RP, SP , and IPs. The exhaust air is forced out the rear of the
chassis above and to each side of the internal slot compartment. The airflow path is
shown in Figure 2. The air dam shown in the Figure 2 keeps the chassis blower air
separate from the air drawn in by the power supply fans.
Two air ducts on the rear of the blower, shown shaded in the Figure 2, fit snugly into
the two cutouts in the backplane. The blower is secured to the backplane with three
large captive Phillips or Allen-head screws (the earliest chassis manufactured use Phillips
screws; the rest now use Allen-head screws). A cable (purple +24V wire and black
ground wire) with a keyed three-prong plug connects the blower to the backplane power
bus to deliver power from the power supplies (see the blower power connection in
Figure 1).
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tac@cisco.com