User's Manual

DEC. 2011—EFT REVIEW DRAFT—CISCO CONFIDENTIAL
4-2
Cisco 1240 Connected Grid Router Hardware Installation Guide
OL-26223-01
Chapter 4 Opening the Router Chassis
Opening the Router Door
Safety Information
Before performing any of the tasks in this chapter, read the safety warnings in the Installation Safety and
Site Preparation chapter.
Captive Screws
The router door features six captive screws, shown in Figure 4-1 (1).
Figure 4-1 Router Door, Showing Captive Screws
Order of Loosening and Tightening Door Screws
Cisco recommends that you loosen and tighten the door screws in the order shown in Figure 4-1.
The chassis door features an environmental seal that protects the chassis against environmental elements
when the door is closed. This seal creates pressure, which can cause the door to open suddenly when the
last screw is loosened.
1