Cisco 7304 Installation And Configuration Manual page 51

Chapter 3 Preparation for Installation
Figure 3-1
1 Metal carrier
Although the metal carrier helps to protect the printed circuit boards from ESD, wear a preventive
antistatic strap whenever handling a network services engine. Ensure that the strap makes good skin
contact and connect the strap's clip to an unpainted chassis surface to channel unwanted ESD voltages
safely to ground.
If no wrist strap is available, ground yourself by touching the metal part of the chassis.
Make sure to tighten the captive installation screws on the network services engine (use a number 2
Caution
Phillips or a 3/16-inch flat-blade screwdriver). These screws prevent accidental removal, provide proper
grounding for the router, and help to ensure that the network services engine is properly seated in the
router midplane.
Following are guidelines for preventing ESD damage:
• Always use an ESD wrist strap or ankle strap when installing or replacing the network services
engine. Ensure that the ESD strap makes contact with your skin.
• Handle the network services engine by its metal carrier edges and handles only; avoid touching the
printed circuit board components or any connector pins.
When removing the network services engine, place it on an antistatic surface with the printed circuit
•
board components facing upward, or in a static shielding bag. If you are returning a network services
engine to the factory, immediately place it in a static shielding bag.
Periodically check the resistance value of the antistatic strap. The measurement should be within the
Caution
range of 1 to 10 megohms (Mohms).
OL-3967-01
Handling a Network Services Engine—Side View
1
2
Cisco 7304 Network Service Engine Installation and Configuration
2 Printed circuit board
Safety Guidelines
3-13