you will need the following tools:
. rom extraction tool or a small flat-blade screwdriver
. needlenose pliers
. one 32-pin plastic leaded chip carrier (plcc) for removing the rom chip from the cisco 3660 mainboard
follow this procedure to replace the 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 sections:
. removing the cisco 3620 or cisco 3640 router cover, page 5-2
. removing the cisco 3660 mainboard tray, page 5-5
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 2-2. be careful not to damage or scratch the printed circuit card under the rom.
step 3 locate the rom on the mainboard. (see figure 5-19 through figure 5-21.)
step 4 if you have a cisco 3620 or cisco 3640 router, gently remove the old rom with a rom extraction tool or a small flat-blade screwdriver, and set it aside.
if you have a cisco 3660 router, gently remove the old rom with a 32-pin plcc extractor, and set it aside. (see figure 5-22.)
step 5 for a cisco 3620 or cisco 3640 router, orient and insert the new rom in its socket (shown in figure 5-19 and figure 5-20), being careful to not bend or crush any of the bottom pins. to straighten out a bent pin, use needlenose pliers. align the notch in the new rom with the notch in the rom socket, ignoring the orientation of the label.
for a cisco 3660 router, orient and insert the new rom in its socket as shown in figure 5-23, being careful to not bend or crush any of the bottom pins. to straighten out a bent pin, use needlenose pliers. align the notch in the new rom with the notch in the rom socket, ignoring the orientation of the label.
the notch on the rom must match the notch on the mainboard socket. installing the rom backward will damage the rom, the router, or both.
when you finish replacing the rom and have installed all internal components, proceed to:
. replacing the cover on a cisco 3620 or cisco 3640 router, page 5-30
. replacing the cisco 3660 mainboard tray, page 5-33
testing rom installation
test your installation by rebooting the router. if you installed the rom correctly, the router will boot into the rom monitor or the cisco ios software.
if you suspect that the rom is inserted incorrectly, remove and reinstall the rom as described in the "replacing the rom" section on page 5-24. reboot the router again.
if you are still having problems after following the steps in this procedure, refer to appendix a, "troubleshooting."