Cisco ASR 5500 Administration Manual page 181

Troubleshooting
Each LED on the PFU should illuminate blue for normal operating conditions.
Figure 12: PFU LEDs
The possible states for these LEDs are described in the following table. If the LED is not blue, use the
troubleshooting information below to diagnose the problem.
Table 13: PFU LED States
Color Description
Blue Power feed is supplying -48VDC to
this power plane
None PFU is not receiving power to one
or more of its power planes.
Troubleshooting
None needed.
Verify that each circuit breaker is in the ON position.
Verify that the RTN and -48VDC lugs are attached properly to the posts
on the upper rear of the chassis.
Verify that the ground lug is attached properly.
Use a voltmeter to verify that the power distribution panel is supplying
the correct voltage and sufficient current to the terminals at the rear of
the PFU.
Check the cables from the power source to the rack for continuity.
If a power distribution panel (PDP) is installed between the power
distribution frame (PDF) and the chassis, verify that its circuit breakers
are set to ON.
If a PDP is installed between the PDF and the chassis, check the cables
from the PDP to the chassis for continuity.
If all of the above suggestions have been verified, then it is likely that
the PFU is not functional. Please contact your service representative.
ASR 5500 System Administration Guide, StarOS Release 19
Checking the LEDs on the PFU
153