Juniper T640 Hardware Manual page 190

T640 Core Router Hardware Guide
160
Regularly inspect the air filters on each power supply for dust and debris, and replace
the side filter on AC power supplies or front filter element on AC and DC power supplies
every 6 months. To replace a power supply front air filter element, see "Replacing a
Front Air Filter Element on a T640 AC or DC Power Supply" on page 294. To replace a
side air filter, see "Replacing a Side Air Filter on a T640 AC Power Supply" on page 295.
Routinely check the LEDs on the DC power supply faceplates. If the
steadily, the power supplies are functioning normally.
Routinely check the LEDs on the AC power supply faceplates. If the
lit, the AC terminal blocks are receiving power. If the
supplies are functioning normally.
Check the red and yellow alarm LEDs and the LCD on the craft interface. Power supply
failure or removal triggers an alarm that causes one or both of the LEDs to light and
an error message to appear on the LCD. You can display the associated error messages
by issuing the CLI command:
user@host> show chassis alarms
For a list of possible alarm messages, see "Troubleshooting Using the T640 Chassis
and Interface Alarm Messages" on page 165.
Issue the
show chassis environment pem
supplies. For DC- powered routers, the output is similar to the following:
user@host> show chassis environment pem
PEM 0 status:
State
Temperature
DC Input:
DC Output
FPC 0
FPC 1
FPC 2
FPC 3
FPC 4
FPC 5
FPC 6
FPC 7
SCG/CB/SIB
PEM 1 status:
State
Temperature
DC Input:
DC Output
FPC 0
FPC 1
FPC 2
FPC 3
FPC 4
FPC 5
FPC 6
FPC 7
SCG/CB/SIB
DC OK
command to check the status of the power
Online
24 degrees C / 75 degrees F
OK
Voltage Current
0 0
54558 981
54558 2800
54700 2225
54375 2387
54308 3543
54558 1287
54616 2650
54150 181
Online
23 degrees C / 73 degrees F
OK
Voltage Current
0 0
50691 0
50766 0
50725 0
50725 0
50766 0
50808 0
50625 0
50300 0
Copyright © 2010, Juniper Networks, Inc.
DC OK LEDs are lit
LEDs are
AC OK
LEDs are lit, the AC power
Power Load
0 0
53 7
152 20
121 16
129 17
192 25
70 9
144 19
9 0
Power Load
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0