Figure c-1 removing the chassis screws step 4, Step 5, Step 6 – Cisco 1721 User Manual
Page 71: Rear panel #1 phillips screwdriver top of router
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Cisco 1721 Router Hardware Installation Guide
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Appendix C Installing and Upgrading Memory and Virtual Private Network Modules
Opening the Chassis
Figure C-1
Removing the Chassis Screws
Step 4
Turn the router back to its original position (top up).
Step 5
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.
Step 6
Place the router bottom on an antistatic mat, and begin installing memory.
CONSOLE
10/100 ETH
AU
X
FDX
LINK
100
W
IC0O
K
WI
C1O
K
MOD OK
Model
Cisco 1721
SE
E M
AN
UA
L B
EF
OR
E IN
ST
AL
LA
TIO
N
DS
U
56
K
CD
AL
LP
RD
TD
Rear panel
#1 Phillips screwdriver
Top of router
65533
+5, +12, -12