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Cisco 7401ASR Installation and Configuration Guide
OL-5419-01 B0
Chapter1 Ov erview and Parts Installation
Replacing the SDRAM DIMM
Warning
When performing the following procedures, wear a grounding wrist strap to avoid ESD damage to the
card. Some platforms have an ESD connector for attaching the wrist strap. Do not directly touch the
system board with your hand or any metal tool, or you could shock yourself.
To replace or upgrade the SDRAM DIMM, follow these instructions:
Removing the Cover
The Cisco 7401ASR router cover fits tightly on the chassis. Follow these instructions to remove the
cover:
Step1 Power off the router by turning the power switch to the off position.
Note After powering off the router, wait at least 30 seconds before powering it on again.
Step2 Remove any cables from the Cisco 7401ASR router, including the power cables. For AC power supplies,
unplug the AC power cord from the power outlet. For DC power supplies, to ensure t hat 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.
Figure1-8 Removing the Screws and Releasing the Cover
Step3 Remove the Cisco 7401ASR router from the rack, if it is ra ck-m oun ted.
Step4 Remove the four screws holding the cover to the chassis.
Note If needed, use a Phillips recess flat-head screw, M3.5 x 6-mm long, type B thread, steel with
black zinc coating, as a replacement.
Step5 Insert a flat-blade screwdriver in each of the side cover removal slots.
Step6 Push the screwdriver blade against the cover latches to release the cover, as shown in Figure1-8. The
cover moves forward about one-quarter inch.
1Cover screws 2Cover removal slot and flatblade screwdriver
ENABLED
RX CELLS
RX CARRIER
RX ALARM
TX
RX
ENHANCED ATM
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