1.
Disconnect the faulty PEM from its power source. Choose one of the following options:
The faulty DC PEM might be connected to the external power source directly, or to
another DC PEM from which it receives its power:
•
If you are removing the DC PEM that is connected to an external power source,
follow the appropriate steps to disconnect the DC PEM from that source.
•
If the faulty DC PEM receives its power from another PEM, follow the appropriate
steps to disconnect this other DC PEM from the power source.
2.
Label all cables to make them easier for you to reconnect later.
3.
Remove the plastic shield covering the studs.
4.
Remove the cables from the faulty DC PEM by removing the nuts, washers and double
lugs from the studs.
5.
Remove the DC PEM from the chassis.
a. Loosen the four thumbscrews (one on each corner of the DC PEM).
b. Pull out the module. Be careful to keep the module straight along the slot guides
to avoid damage to DC PEM components.
Once the module is removed, place it in an antistatic bag or on a grounded antistatic
mat.
6.
Install the replacement DC PEM.
Carefully slide the module along the slot guides until the DC PEM connects to the
backplane. Carefully tighten the thumbscrews.
7.
Connect the cabling to the replacement DC PEM, using the following setup for each
stud:
First add one nut to the stud. Add the double hole lug, the washers and the remaining
nut.
8.
Orient and reinstall the plastic shield.
The plastic shield has small holes to allow instrument access to the terminals while
the shield is in place. Align the holes with the terminals when installing.
9.
Follow the appropriate procedures in your plant to reconnect power from the plant
power source.
The LEDs start to light up. The ACT LED turns solid green to acknowledge the module
is powered on and installed successfully.
10.
Perform a voltage checklist. You can check the voltage through the instrument access
holes in the plastic shields on the DC PEMs.
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Copyright © 2019, Juniper Networks, Inc.
Chapter 7: BTI7800 Series Field Replaceable Units (FRUs)
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