Juniper MX240 Hardware Manual page 285

CAUTION:
offline. If there is only one host subsystem, taking the host subsystem offline shuts
down the router.
CAUTION:
Routing engine, switch it to be the backup before removing it.
To remove a Routing Engine from an SCB (see
1. Take the Routing Engine offline gracefully.
2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to the ESD point on the chassis.
4. Verify that the Routing Engine LEDs are off.
5. Loosen the captive screws on the left and right of the Routing Engine.
6. Flip the ejector handles outward to unseat the Routing Engine.
7. Grasp the Routing Engine by the ejector handles, and slide it about halfway out of the chassis.
8. Place one hand underneath the Routing Engine to support it, and slide it completely out of the chassis.
9. Place the Routing Engine on the antistatic mat.
NOTE: To maintain proper airflow through the chassis, do not leave an SCB installed in
the chassis without a Routing Engine for extended periods of time. If a Routing Engine is
removed, a replacement Routing Engine should be installed as soon as possible.
Before you replace a Routing Engine, you must take the host subsystem
If the Routing Engine to be replaced is currently functioning as the master
Figure 85 on page 290):
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