Preventing Electrostatic Discharge Damage - Cisco 12406 Replacement Instructions Manual

•
In addition, observe the following guidelines when working with any equipment that is disconnected
from a power source but still connected to telephone or network wiring:
•
•
•
•

Preventing Electrostatic Discharge Damage

Many router components can be damaged by static electricity. Some components can be damaged by
voltages as low as 30V, while static voltages as high as 35,000V can be generated just by handling plastic
or foam packing material, or by sliding assemblies across plastic and carpets. Not exercising the proper
electrostatic discharge (ESD) precautions can result in intermittent or complete component failures. To
minimize the potential for ESD damage, observe the following guidelines:
•
Caution You should periodically check the resistance value of the ESD-preventive strap. The measurement
should be between 1 and 10 megohms.
•
•
•
•
•
Cisco 12006 and Cisco 12406 Router Chassis Replacement Instructions
6
If an electrical accident does occur, proceed as follows:
Use caution; do not become a victim yourself. Disconnect power to the router.
–
If possible, send another person to get medical aid; otherwise, assess the condition of the victim
–
and then call for help.
Determine if the person needs rescue breathing or external cardiac compressions; then take
–
appropriate action.
Never install telephone wiring during a lightning storm.
Never install telephone jacks in wet locations unless the jack is specifically designed for wet
locations.
Never touch uninsulated telephone wires or terminals unless the telephone line has been
disconnected at the network interface.
Use caution when installing or modifying telephone lines.
Always use an ESD-preventive antistatic wrist strap or ankle strap and ensure that it makes good
skin contact.
When removing or installing a component, make sure the equipment end of your antistatic strap
leash is connected to one of the ESD connection sockets on the front of the chassis or to a bare metal
surface on the chassis. (See
ESD-preventive wrist strap only protects the component from ESD voltages on the body; ESD
voltages on your clothing can still cause component damage.
Always place a card component-side-up on an antistatic surface, in an antistatic card rack, or in a
static shielding bag. If you are returning the item to the factory, immediately place it in a static
shielding bag.
When installing a line card or route processor (RP), use the ejector levers to seat the card connectors
in the backplane, then tighten both captive screws on the faceplate of the card. These screws prevent
accidental removal, provide proper grounding for the router, and help to ensure that the card
connector is seated in the backplane.
When removing line cards, clock and scheduler cards, switch fabric cards, or an RP, use the ejector
levers to unseat the card connector from the backplane. Pull the metal card carrier out slowly,
placing one hand along the bottom of the carrier to guide it straight out of the slot.
Handle line cards, clock and scheduler cards, switch fabric cards, or an RP by the metal card carrier
edges only; avoid touching the board or any connector pins.
Figure 4.) Avoid contact between the component and your clothing. The
78-16109-01