Installation guide

Upgrading System Memory in Cisco 3600 Series Routers

78-3636-05

Replacing ROM

Step 1 Attach an ESD-preventive wrist strap and ensure that it makes good contact with your skin. Connect the

equipment end of the wrist strap to the metal backplane of the chassis, avoiding contact with the

connectors.

Step 2 Access the mainboard by following the procedures in one of the following:

• “Removing the Router Cover (Cisco 3620, Cisco 3631, Cisco 3640)” section on page 14

• “Removing the Mainboard Tray (Cisco 3660)” section on page 16

Caution Correct placement of the ROM is crucial. If improperly positioned, the new component could be

damaged when the router is powered on. Read all instructions before proceeding. To prevent damage to

the ROM from ESD (when handling the router and its components), follow the ESD procedures

described in the “Preventing Electrostatic Discharge Damage” section on page 13. Be careful not to

damage or scratch the printed circuit card under the ROM.

Step 3 Locate the ROM on the mainboard. (See Figure 20 through Figure 22.)

Figure 20 ROM Location on the Cisco 3620 Mainboard

H7319

ROM