Juniper MX2020 Hardware Manual page 319

Copyright © 2013, Juniper Networks, Inc.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the
operating power supply unit, each PDM slot must contain either a PDM or a
blank panel. If you remove a PDM, you must install a replacement PDM or a
blank panel shortly after the removal.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
the circuit breaker back on.
Make sure that the voltage across the AC power source cord is 0 V and that there is
1.
no chance that the cord might become active during the installation process.
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
2.
the strap to one of the ESD points on the chassis.
Switch off ( O ) the AC PSMs that are powered only from the AC PDMs being removed.
3.
NOTE: After powering off a PDM, wait at least 60 seconds before turning
it back on.
Pull the locking levers on either side of the faceplate away until they stop.
4.
Using both hands, slide the PDM into the chassis until you feel resistance (see
5.
135 on page 294).
Push the lock levers completely into until they make contact with the PDM faceplate.
6.
Tighten the two captive screws on the locking levers of the PDM faceplate to secure
7.
the PDM in the chassis.
Using a number 2 Phillips (+) screwdriver, loosen the four screws on the cover of the
8.
metal wiring compartment that protects the AC terminal block.
Chapter 13: Replacing MX2020 Router Hardware Components
Figure
293