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Cisco AS5400 Universal Gateway Chassis Installation Guide
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Appendix A Replacing Memory Components
Removing the Chassis Cover
Warning
Do not work on the system or connect or disconnect cables during periods of lightning
activity. To see translations of the warnings that appear in this publication, refer to the
Regulatory Compliance and Safety Information
document that accompanied this device.
Warning
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. To see translations of
the warnings that appear in this publication, refer to the
Regulatory Compliance and
Safety Information
document that accompanied this device.
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 warning:
Warning
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. To see
translations of the warnings that appear in this publication, refer to the
Regulatory
Compliance and Safety Information
document that accompanied this device.
Warning
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. To see translations of the warnings that appear in this publication, refer to the
Regulatory Compliance and Safety Information
document that accompanied this device.
Chassis Cover Removal
You must open the chassis to gain access to its interior components: boot read-only memory (ROM)
software, synchronous dynamic random-access memory dual in-line memory modules (SDRAM
DIMMs), and Flash memory SIMMs. (When you replace the boot ROMs, you must also remove all
feature cards in the chassis.)
Take these steps:
Step 1
Turn the power switch OFF and disconnect site power. (Note that the power switch is part of the power
supply.)
Step 2
If using a DC-powered unit, refer to
Figure A-1
and complete Step a through Step d.
Warning
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 warnings that appear in this publication, refer to the
Regulatory Compliance and
Safety Information
document that accompanied this device.
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