• The blue DC OK LED is not lit when the power switch on the power supply faceplate
is off, or when a power supply is not functioning normally or is not receiving voltage.
• The following indicate a problem on a three-phase delta or wye AC power supply:
• The green AC OK LED is off when the power supply is not receiving source AC power.
• The blue DC OK LED is off.
• If the blue DC OK LED blinks but is not going through a startup test, the power supply
detects a fault (the power supply fails, does not have sufficient airflow, or is not
properly inserted).
• The yellow OVER TEMP LED lights when the power supply is not receiving enough
airflow to maintain proper temperature.
In Table 99 on page 477, the text in the column labeled ”LCD Message” appears in the
display of the craft interface. The text in the column labeled “CLI Message” appears in
the output from the show chassis alarms command.
Table 99: T640 Power Supply Alarm Messages
CLI MessageLCD MessageAlarm Type
PEM pem-number Over TemperaturePEM pem-number Over TempRed
PEM pem-number Output FailurePEM pem-number Output Fail
PEM pem-number Input FailurePEM pem-number Input Fail
PEM pem-number RemovedPEM pem-number RemovedYellow
PEM pem-number Configuration
Mismatch-number of inputs
PEM pem-number Inputs Cfg
Solution To troubleshoot the T640 power system:
1. If the OVER TEMP LED on one of the power supplies lights, check the fans and air
filters in the chassis to be sure they are functioning and providing sufficient airflow.
2. Check the display on the craft interface. The Junos OS constantly updates the screen
with status information for each component. For more information about the display,
see “T640 Craft Interface Description” on page 22.
NOTE: On the display and in the CLI, the power supplies are referred to
as PEM0 and PEM1, from top to bottom.
477Copyright © 2017, Juniper Networks, Inc.
Chapter 33: Troubleshooting Components
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