Juniper T640 Hardware Manual page 167

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Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
3.
the strap to one of the ESD points on the chassis.
Switch the circuit breakers on each DC power supply faceplate to the off position (
4.
or switch the power switch on each AC power supply faceplate to the standby position.
T640 Preventing Electrostatic Discharge Damage on page 306
Powering On a DC-Powered T640 Router on page 130
Powering On an AC-Powered T640 Router on page 135
General Electrical Safety Guidelines and Electrical Codes for M Series, MX Series, and
T Series Routers on page 324
Chapter 13: Providing Power to the T640 Router
)
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