Cisco 1751V Hardware Installation Manual page 68

Safety Information
Do not work on the system or connect or disconnect cables during periods of
Warning
lightning activity.
Do not touch the power supply when the power cord is connected. For systems
Warning
with a power switch, line voltages are present within the power supply even
when the power switch is off and the power cord is connected. For systems
without a power switch, line voltages are present within the power supply
when the power cord is connected.
Before working on equipment that is connected to power lines, remove jewelry
Warning
(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.
Only trained and qualified personnel should be allowed to install or replace this
Warning
equipment.
Hazardous network voltages are present in WAN ports regardless of whether
Warning
power to the router is OFF or ON. To avoid electric shock, use caution when
working near WAN ports. When detaching cables, detach the end away from
the router first.
During this procedure, wear grounding wrist straps to avoid ESD damage to the
Warning
router. Do not directly touch the backplane with your hand or any metal tool, or
you could shock yourself.
Cisco 1751 Router Hardware Installation Guide
C-2
Appendix C Installing and Upgrading Memory and Packet Voice Data Modules
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