Off; Troubleshooting The M40E Power System When All Leds On One Supply Are Off Or Led States Are Not Correct - Juniper M40E Hardware Manual

Troubleshooting the M40e Power System When All LEDs on Both Supplies Are Off
Problem
Solution
Related
Documentation
Troubleshooting the M40e Power System When All LEDs on One Supply Are Off or
LED States Are Not Correct
Problem
Copyright © 2010, Juniper Networks, Inc.
The following LED states indicate that a power supply is functioning correctly:
On an AC power supply, the green LED labeled
On a DC power supply, both the green LED labeled
are lit steadily and the yellow LED labeled
OUTPUT OK
If all LEDs are off on both power supply faceplates, either someone has switched off
power to the router or the system temperature has exceeded the acceptable maximum.
In the latter case, the host module shuts down both power supplies. There is no power
to the router, so the alarm LEDs on the craft interface are not lit and the LCD also goes
blank.
Excessive system temperature is almost always caused by excessive environmental
temperature. Correct the environmental temperature before powering on the router.
M40e Power System Description on page 42
M40e Router Power Requirements on page 274
M40e Router LED Overview on page 146
If either of the following conditions applies, perform the diagnostic procedure described
following the list of conditions:
The LEDs on one power supply are all off, but the LEDs on the other supply indicate
that it is functioning properly.
The LED states on one or both supplies indicate a problem:
On an AC power supply, the green LED labeled
On a DC power supply, the green LED labeled
labeled is lit, or the blue LED labeled
CB OFF
Chapter 15: Troubleshooting M40e Hardware Components
OUTPUT OK is lit steadily.
and blue LED labeled
CB ON
CB OFF
is blinking slowly.
OUTPUT OK
CB ON is not lit and the yellow LED
is blinking or is not lit.
OUTPUT OK
is not lit.
155