Juniper MX2020 Hardware Manual page 242

MX2020 3D Universal Edge Router Hardware Guide
Removing the Power Distribution Modules Before Installing an MX2020 Router
210
Remove the topmost PDM (
remove an AC or DC PDM (see
Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect
1.
the strap to an approved site ESD grounding point. See the instructions for your site.
On an AC-powered router, move the AC circuit breaker from the power source to the
2.
off ( O ) position. On a DC-powered router, move the DC circuit breaker from the power
source to the off position.
O
We recommend this precaution even though the PDMs are not connected to power
sources.
Loosen the two captive screws on the PDM faceplate. Pull the two spring-loaded
3.
locking levers away from the chassis until it stops.
NOTE:
PDM3/Input1
release from chassis, and
are pulled up to release from chassis.
The PDM is extended slightly away from the chassis.
With both hands, grasp the two handles and gently pull the PDM straight out of the
4.
chassis.
CAUTION: Do not touch the power connector in the back of the PDM. They
can get damaged.
CAUTION: Do not stack PDMs on one another after you remove them.
Place each component on an antistatic mat resting on a stable, flat surface.
PDM3/Input1 ) first, and then work your way downward. To
Figure 84 on page 211 and
and locking levers are pulled down to
PDM1/Input1
PDM0/Input0
Figure 85 on page 211).
and PDM2/Input0 locking levers
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