Cisco Systems AS5350XM Manual De Usuario

Before working on a chassis or working near power supplies, unplug the power cord on AC units; 
disconnect the power at the circuit breaker on DC units. Statement 12

NVRAM in the universal gateway uses an internal lithium battery to maintain data. Although this is not 
a field-serviceable component, we are required to provide the following safety warnings:

There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with 
the same or equivalent type recommended by the manufacturer. Dispose of used batteries according 
to the manufacturer’s instructions. Statement 1015

Before working on equipment that is connected to power lines, remove jewelry (including rings, 
necklaces, and watches). Metal objects will heat up when connected to power and ground and can 
cause serious burns or weld the metal object to the terminals. Statement 43

You must open the universal gateway chassis to gain access to its interior components: boot read-only 
memory (ROM) software, synchronous dynamic random-access memory, dual in-line memory (SDRAM 
DIMMs) modules. (When you replace the boot ROM, you must also remove all feature cards in the 
chassis.)

To remove the chassis cover, follow this procedure:

Turn the power switch on the universal gateway off and disconnect site power.

Remove all interface cables from the rear panel of the universal gateway.

Place the gateway so that the front panel is facing you.

Remove the five screws on the chassis cover, as shown in 

.