JUNOS Internet Software Network Operations Guide: Hardware
322 ! Verifying SCG Failure
Verifying SCG Failure
Steps To Take To verify SCG failure, follow these steps:
1. Check the SCG Connection on page 322
2. Perform an SCG Swap Test on page 322
Step 1: Check 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.
Step 2: Perform an SCG Swap Test
Action To perform a swap test on a SCG, follow these steps:
1. Take the SCG offline by doing one of the following:
! Use the following CLI command:
user@host> request chassis scg offline slot number
! Attach an electrostatic discharge (ESD) wrist strap to your bare wrist, and
connect the wrist 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.
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.
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