Removing a T640 Standard Control Board or T-CB
CAUTION: Before you replace a control board, you must take the host
subsystem offline. If there is only one host subsystem, taking the host
subsystem offline shuts down the router. See “Taking the T640 Host
Subsystem Offline” on page 307.
CAUTION: If the control board to be replaced is associated with the Routing
Engine currently functioning as the master Routing Engine, switch it to the
backup before removing the control board. See “Taking the T640 Host
Subsystem Offline” on page 307.
To remove a standard control board or T-CB (see Figure 149 on page 315 and
Figure 150 on page 315):
1. Take the host subsystem offline. See “Taking the T640 Host Subsystem Offline” on
page 307.
2. Place an electrostatic bag or antistatic mat on a flat, stable surface.
3. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to one of the ESD points on the chassis.
4. For T-CBs in a T640 router connected to a TX matrix router, disconnect the cable
plugged into the port labeled CIP.
5. Loosen the captive screws (using a Phillips (+) screwdriver, number 2) on the ejector
handles on both sides of the control board faceplate.
6. Flip the ejector handles outward to unseat the control board.
7. Grasp the ejector handles, and slide the control board about halfway out of the chassis.
8. Place one hand underneath the control board to support it, and slide it completely
out of the chassis.
9. Place the control board on the antistatic mat.
10. If you are not replacing the control board now, install a blank panel over the empty
slot.
Copyright © 2017, Juniper Networks, Inc.314
T640 Core Router Hardware Guide
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