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BTI7800 Series Hardware Overview and Installation Guide
Replacing the BTI7814 AC PEM
182
With a portable multimeter, measure the voltage at each DC PEM as follows:
: -42 VDC to -60 VDC as measured from the Feed to the Return.
- Minus Feed
+ Positive Return
: Within less than 2 V of the frame or chassis ground.
You have successfully completed this procedure.
Use this procedure to remove and replace the AC Power Entry Module (AC PEM) on the
BTI7814 chassis.
The AC PEM that you are replacing must be disconnected from its power source. The
other AC PEMs can remain powered.
WARNING:
Ensure that you are familiar with the safety and electrical warnings
described in
"BTI7814 Field-Replaceable Units (FRUs)" on page
NOTE:
If you plan on reusing the AC PEM that you are removing, you must
wait for a minimum of 60 seconds before reinserting the removed PEM into
another slot or chassis.
Tools Required
Number 2 Phillips screwdriver
Multimeter
Identify the faulty PEM. The faulty PEM has the red or amber LED illuminated.
1.
Turn off power and unplug the AC cable to the faulty PEM. There is an ON/OFF switch
2.
on the AC PEM housing for each PEM.
Remove the AC PEM housing cover to expose the AC PEM modules.
3.
a. Loosen the four thumbscrews on each corner of the AC PEM housing cover so that
the screws spin freely. Ensure the thumbscrews are completely disengaged from
their threaded holes. You might need a Phillips screwdriver for this step.
b. Using the thumbscrews as handles, gently pull the cover away from the housing.
You might need to alternately pull on one pair of thumbscrews, and then on the
other pair.
c. Set the cover down so that it does not get in your way.
Remove the defective AC PEM module.
4.
179.
Copyright © 2019, Juniper Networks, Inc.
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