JUNOS Internet Software Network Operations Guide: Hardware
272 ! Maintaining the Air Filter
What It Means The messages system log file records the time when the failure or event occurred,
the severity level, a code, and a message description. Use the
show log messages |
match fan
command to view only fan error messages. Use this information to
diagnose a cooling system problem and to let the Juniper Networks Technical
Assistance Center (JTAC) know what error messages were generated and the router
events prior to the problem. For more information about system log messages, see
the JUNOS System Log Messages Reference.
Maintaining the Air Filter
Action To maintain the air filter on M40, M40e, M160, and T320 routers and T640 routing
nodes, follow these steps:
1. Check the air filter for dust, debris, or holes. If the air filter needs cleaning,
clean it as described in the appropriate hardware guide.
2. If the air filter needs repair, replace it as described in the appropriate hardware
guide.
Verifying a Fan Failure
Action To verify a fan failure, follow these steps:
1. Perform a swap test on the fan. Remove the problem fan tray and put it into
another bay. If the fan tray does not work in the other bay, it is probably faulty
and must be replaced. If the fan tray works in another bay, there is probably a
problem with the power connectivity from the midplane.
2. Check the fan power connector.
3. Check the fan connector on the router midplane.
4. If the fan fails, replace it as described in the appropriate hardware guide. The
fans are hot-removable and hot-insertable. You can replace the fans without
powering down the router.
CAUTION: Because the impellers and fans are quite powerful, it is important to
keep the air filter in place while the router is operating. The impellers and fans
could pull in foreign material, such as bits of wire, through an unfiltered air intake,
resulting in damage to router components.
NOTE: The cooling system components (fans and impellers) do not have serial
numbers. Therefore, you will not see a serial number listed in the hardware
inventory or a serial number ID label on the component.
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