Check the SCG Connection
Purpose To verify SCG failure by checking the SCG connection.
Action To check the SCG connection, make sure the SCG is properly seated in the midplane.
Make sure none of the SCG pins are bent. Check the thumbscrew on the right side of the
SCG.
Perform an SCG Swap Test
Purpose To verify SCG failure by performing an SCG swap test.
CAUTION: Before performing a swap test, always check for bent pins in the
midplane and check the SCG for stuck pins in the connector. Pins stuck in
the component connector can damage other good slots during a swap test.
Action To perform a swap test on a SCG:
1. Take the SCG offline by doing one of the following:
• Use the following command:
user@host> request chassis scg offline slot number
• Attach an electrostatic discharge (ESD) strap to your bare wrist, and connect the
strap to one of the ESD points on the chassis. Press the online/offline button on the
SCG faceplate and hold it down until the LED goes out (about 5 seconds).
2. Loosen the captive screws on the edges of the SCG faceplate.
3. Grasp the SCG by the handle on the faceplate and slide it out of the chassis.
4. Place the SCG on the antistatic mat.
5. Remove the replacement SCG from its electrostatic bag.
6. Carefully align the sides of the SCG with the guides in the SCG slot.
7. Grasp the SCG by its handle and slide it straight into the chassis until it contacts the
midplane.
8. Tighten the captive screws on the corners of the SCG faceplate.
9. Bring the SCG online by doing one of the following:
• Use the following command:
user@host> request chassis scg online slot number
• Press the online/offline button until the green ONLINE LED lights.
10. Verify that the SCG is online by using the following command:
user@host> request chassis scg online slot number
409Copyright © 2012, Juniper Networks, Inc.
Chapter 15: Monitoring the SCGs
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