Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual page 60

ERX 11.1.x Hardware Guide
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WARNING: Turn off the router before you install the redundancy midplane. Working
inside the router when it is on can lead to electric shock and serious burns.
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CAUTION: Do not overtighten the screws.
CAUTION: A misaligned redundancy midplane can result in bent pins on the
backplane and midplane and poor contact between the I/O modules and the
redundancy midplane.
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Installing Components for Line Module Redundancy
Enter the halt command.
See JUNOSe System Basics Configuration Guide, Chapter 6, Managing Modules for
information about the halt command.
Turn off the power switches located on the power input module in the rear of
the system (Figure 22 on page 45).
Remove the I/O modules from the slots that the redundancy midplane will span.
Place the redundancy midplane in the chassis so that it rests against the guides
below the chassis midplane (Figure 22 on page 45).
Align the screw holes in the redundancy midplane with the screw holes in the
guides so that the midplane covers the slots for the redundancy group.
Using a No. 2 Phillips screwdriver and the screws provided, loosely attach, but
do not tighten, the redundancy midplane to the guides.
Carefully insert an I/O module in one slot to ensure that the redundancy midplane
is aligned correctly; then tighten the screws.