6. Place one hand underneath the SIB to support it and slide it completely out of the
chassis. Place it on the antistatic mat.
7. Repeat the procedure for each of the remaining SIBs.
Figure 70: Removing a SIB
Removing the T640 Control Boards
The router can have up to two control boards. These are located in the upper rear of the
chassis in the slots marked CB0 and CB1. Each one weighs approximately 5 lb (2.3 kg).
To remove the T640 control boards (see Figure 71 on page 184 and Figure 72 on page 184):
1. Place an electrostatic bag or antistatic mat on a flat, stable surface.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
the strap to an approved site ESD grounding point. See the instructions for your site.
3. Loosen the captive screws on the ejector handles on both sides of the control board
faceplate.
4. Flip the ejector handles outward to unseat the control board.
5. Grasp the ejector handles and slide the control board about halfway out of the chassis.
6. Place one hand underneath the control board to support it and slide it completely out
of the chassis. Place it on the antistatic mat.
183Copyright © 2017, Juniper Networks, Inc.
Chapter 19: Installing the T640 Router Without a Mechanical Lift
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