Cisco 1720 Hardware Installation Manual page 69

Appendix C Installing and Upgrading Router Memory
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Removing the Chassis Screws
#1 Phillips screwdriver
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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 anti-static mat and begin
installing memory.
Cisco 1700 Router Hardware Installation Guide
Top of router
C-3