Before installing or removing routing engines you must power off the services gateway:
On the external management device connected to
the Routing Engine, issue the request system halt operational
mode command. The command shuts down the Routing Engine cleanly, so
its state information is preserved. user@host> request system halt
Wait until a message appears on the console confirming that
the operating system has halted. For more information about the command,
see the JUNOS System Basics and Services Command Reference.
Attach an electrostatic discharge (ESD) grounding strap to your bare
wrist and connect the strap to one of the ESD points on the chassis. For more information about ESD, see Preventing Electrostatic Discharge Damage.
On an AC-powered services gateway, switch the circuit breaker on each power supply to the off position (O). On a DC-powered services gateway, switch the circuit breaker on each power supply to the off position (OFF).