6.
Removing the MPCs without an Adapter Card Before Installing an MX2020 Router | 255
7.
Removing the CB-REs Before Installing the MX2020 Router | 256
Removing the Power Distribution Modules Before Installing an MX2020 Router
Remove the topmost PDM (PDM3/Input1) first, and then work your way downward. To remove an AC
or DC PDM (see Figure 88 on page 247 and Figure 89 on page 247).
1. 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.
2. On an AC-powered router, move the AC circuit breaker from the power source to the off (O) position.
On a DC-powered router, move the DC circuit breaker from the power source to the off O position.
We recommend this precaution even though the PDMs are not connected to power sources.
3. Loosen the two captive screws on the PDM faceplate. Pull the two spring-loaded locking levers away
from the chassis until it stops.
NOTE: PDM3/Input1 and PDM1/Input1 locking levers are pulled down to release from
chassis, and PDM0/Input0 and PDM2/Input0 locking levers are pulled up to release from
chassis.
The PDM is extended slightly away from the chassis.
4. With both hands, grasp the two handles and gently pull the PDM straight out of the 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.
246
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