Cisco 1721 - VPN Security Router Bundle Hardware Installation Manual page 71

Appendix C Installing and Upgrading Memory and Virtual Private Network Modules
Figure C-1 Removing the Chassis Screws
#1 Phillips screwdriver
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Turn the router back to its original position (top up).
Gently pull the top of the router (which is facing up toward you) up and away from
the bottom of the router (which is resting on the flat surface).
At this point, you might have to disconnect the fan, which is inside the top of the
router chassis, from the motherboard. Do this by disconnecting the fan cable from
the connector (labeled FAN) on the motherboard.
Place the router bottom on an antistatic mat, and begin installing memory.
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Top of router
Cisco 1721 Router Hardware Installation Guide
Opening the Chassis
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