Check the SCB Connection
Purpose To verify SCB failure by checking the SCB connection. If the SCB is not seated properly,
it will not function.
Action To check the SCB connection, make sure that the SCB is properly seated in the slot.
Tighten the captive screws at the top and bottom of the SCB card carrier.
Perform an SCB Swap Test
Purpose To verify SCB failure by performing an SCB swap test.
CAUTION: Before performing a swap test, always check for bent pins in the
midplane and check the SCB 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 an SCB:
1. Attach an electrostatic discharge (ESD) strap to your bare wrist, and connect the
strap to one of the two ESD points on the chassis.
2. Unscrew the thumbscrews at the top and bottom of the card carrier.
3. Flip the ends of the two extractor clips, which are adjacent to the thumbscrews, away
from each other to unseat the SCB from the backplane.
4. Grasp both sides of the card carrier and slide the SCB about three-quarters of the way
out of the router.
5. Move one of your hands underneath the SCB to support it, and slide it completely out
of the chassis.
6. Replace the SCB with one that you know works.
7. Grasp the front of the SCB card carrier with both hands and align the back of the
working SCB card carrier with the slide guides on the chassis.
8. Slide the SCB card carrier all the way into the card cage until it contacts the backplane.
9. Flip the extractor clips, located on the top and bottom of the card carrier, towards
each other to lodge the SCB in place.
10. Tighten the thumbscrews on the card carrier to seat the SCB.
NOTE: To seat the SCB properly, be sure to tighten the screws securely.
If the SCB is not seated properly, it will not function.
499Copyright © 2012, Juniper Networks, Inc.
Chapter 22: Monitoring the SCB
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