Juniper Networks M160 manual 177

Replacing Hardware Components

3.Remove the rear component cover by loosening the thumbscrew at each corner of the cover and pulling it straight off the chassis. For complete instructions, see “Removing the Rear Component Cover” on page 86.

4.Press and hold the offline button on the PCG faceplate until the amber LED labeled FAIL lights, which takes about 3 seconds.

(Keep in mind that if you are removing the master PCG, forwarding halts while the Packet Forwarding Engine resets so that the components start using

the clock signal from the other PCG, which becomes the master. For more information, see “Replacing a PCG” on page 176.)

5.Loosen the thumbscrew at the lower right corner of the PCG faceplate, using a Phillips screwdriver if necessary.

6.Grasp the thumbscrew and slide the PCG about halfway out of the chassis.

CAUTION: Be careful to slide the PCG straight out of the chassis to avoid bending any of the pins on the underside of the board.

7.Place one hand under the PCG to support it, slide it completely out of the chassis, and place it on the antistatic mat or in the electrostatic bag.

Figure 90: Removing a PCG

SFM

SFM

MCS RE

RE MCS

0

1

0 0

1 1

PCG 0

PCG 1

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Replacing Packet Forwarding Engine Components 177