Troubleshooting the M40e Power System When All LEDs on Both Supplies Are Off
Problem
The following LED states indicate that a power supply is functioning correctly:
•
On an AC power supply, the green LED labeled
OUTPUT OK
is lit steadily.
•
On a DC power supply, both the green LED labeled
CB ON
and blue LED labeled
OUTPUT OK
are lit steadily and the yellow LED labeled
CB OFF
is not lit.
Solution
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.
Related
Documentation
M40e Power System Description on page 42
•
•
M40e Router Power Requirements on page 274
•
M40e Router LED Overview on page 146
Troubleshooting the M40e Power System When All LEDs on One Supply Are Off or
LED States Are Not Correct
Problem
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
OUTPUT OK
is blinking slowly.
•
On a DC power supply, the green LED labeled
CB ON
is not lit and the yellow LED
labeled
CB OFF
is lit, or the blue LED labeled
OUTPUT OK
is blinking or is not lit.
155
Copyright © 2010, Juniper Networks, Inc.
Chapter 15: Troubleshooting M40e Hardware Components
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