Cisco 12404 Installation And Configuration Manual page 189

Chapter 4 Troubleshooting the Installation
•
•
•
•
•
•
•
•
•
•
•
If you are unable to resolve the problem or if you determine that either the power
supply or power cable is faulty, contact a service representative for assistance.
OL-11636-01
Are the power supply INPUT OK and OUTPUT OK LEDs on?
If yes, the power source is good, and the power supplies are functional.
–
If no, but the fan tray assembly is operating, suspect a faulty PEM LED.
–
If the fan tray assembly is operating, all internal DC voltages are within
tolerance. Use the show environment command to check the voltages on
each card. The fan tray assembly uses –48 VDC.
If no and there is not other obvious activity, first suspect that the PEM,
–
power switch is not in the ON position. Ensure PEM, power switch is
toggled to the ON position.
– If the PEM power switch is set correctly and the INPUT OK LED
remains off, suspect the AC power source, or the power cable.
Turn the PEM power switch Off and check the AC power source
Verify that the AC power source circuit breaker is On and has not tripped.
Verify that the AC power source circuit breaker has the proper current rating.
Verify each AC PEM in the Cisco 12404 Internet router chassis is attached to
a separate power source.
Check that the uninterruptable power supply (UPS) is functioning correctly.
(In the case of systems powered by an AC power source, there might be a UPS
for each AC PEM in the system.)
Check the power cable or power cord from the power source to the
–
Cisco 12404 router.
Verify that it is in good shape and is not damaged.
If the insulation appears cracked or broken, or the plugs appear loose, do not
use the cable. Immediately replace it with a new cord or cable.
If the LED fails to go On after you connect the power supply to a new power
source. Turn the power switch Off and exchange the power cable with a
replacement, if one is available, and turn the power switch back on. If the
INPUT OK LED then goes on, return the first power cable for replacement.
If the LED still fails to go on when connected to a different power source with
a new power cable, the PEM is probably faulty. If a spare PEM is available,
replace the existing module with the spare and restart the system.
If the INPUT OK LED then goes on, return the faulty PEM for replacement.
Cisco 12404 Internet Router Installation and Configuration Guide
Troubleshooting the Power Subsystem
4-19