perform the procedure below for installing or removing a compact flash memory card mounted internally on the router cpu/mainboard. to access the internal compact flash memory card, you need to remove the chassis cover.
removing the chassis cover
this section describes how to remove the chassis cover to access the compact flash memory card. you need a number 2 phillips or flat-blade screwdriver to perform this procedure.
observe the following precaution if your router uses ac or dc power:
do not touch the power supply when the power cord is connected. for systems with a power switch, line voltages are present within the power supply even when the power switch is off and the power cord is connected. for systems without a power switch, line voltages are present within the power supply when the power cord is connected. to see translations of the various warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.
observe the following precaution if your router uses dc power:
before performing any of the following procedures, ensure that power is removed from the dc circuit. to ensure that all power is off, locate the circuit breaker on the panel board that services the dc circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position. to see translations of the various warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.
perform the following procedure to remove the chassis cover:
step 1 power off the router. however, to channel esd voltages to ground, do not unplug the power cable.
before opening the chassis, disconnect the telephone-network cables to avoid contact with telephone-network voltages. to see translations of the various warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.
step 2 disconnect all network interface cables from the rear panel.
step 3 place the router on a flat surface. remove the five screws located on top of the cover. set the screws aside in a safe place.
step 4 rotate the cover up to a 45-degree angle. (see figure 33.)
. slide the cover to the side (away from the side with the fans) until the tabs are free from the slots. (see figure 33.)

removing the compact flash memory card
after removing the chassis cover as described in the "removing the cisco 3631 router cover" section on page 5-3, perform the following steps to remove the compact flash memory card from the router:
step 1 locate the compact flash memory card on the cpu/mainboard. (see figure 34.)

step 2 remove the retention screw that retains the compact flash memory card by using the phillips screwdriver; save the retention screw for reinstallation.
step 3 carefully pull the compact flash memory card free from the connector.
step 4 place the removed compact flash memory card on an antistatic surface or in a static shielding bag.
installing the compact flash memory card
you can install a compact flash memory card with 32-, 64-, or 128-mb of memory.
perform the following steps to install the compact flash memory card:
step 1 locate the compact flash memory-card connector on the cpu/mainboard. (see figure 34.)
step 2 insert the connector end of the compact flash memory card into the connector until the card is seated in the connector. the card is keyed, so that it cannot be inserted wrong.
step 3 reinstall the retention screw to retain the compact flash memory card.
step 4 install the chassis cover as described in the "replacing the cover on a cisco 3620 or cisco 3640 router" section on page 5-30.
step 5 refer to the "formatting procedures for compact flash memory cards" section on page 5-49 for instructions on formatting the compact flash memory card.
reinstalling the cover
before reinstalling the cover on the router, make sure that all cables are securely tucked in and are not in danger of being pinched or cut.
this section describes how to reinstall the router cover. you need a number 2 phillips screwdriver or flat blade screwdriver to perform this procedure:
step 1 place the chassis on a flat surface.
step 2 hold the cover at a 45-degree angle, and insert the tabs into the slots along the front (bezel) edge of the chassis. (see figure 35.)
step 3 center the cover over the chassis and lower it onto the chassis.

step 4 reinstall the cover screws.
step 5 reinstall the chassis on a rack or desktop.
step 6 reconnect network interface cables.
step 7 power on the router.
after wiring the dc power supply, remove the tape from the circuit breaker switch handle and reinstate power by moving the handle of the circuit breaker to the on position. to see translations of the various warnings that appear in this publication, refer to the regulatory compliance and safety information document that accompanied this device.