Appendix A Troubleshooting; Problem Solving; Troubleshooting The Power And Cooling Systems; Environmental Reporting Features - Cisco MWR 1941-DC - 1941 Mobile Wireless Router Hardware Installation Manual

Problem Solving

Troubleshooting the Power and Cooling Systems

Both the power LED and the fans can help you troubleshoot a power problem. Check the following items
to help isolate the problem:
Check the following items to help isolate problems with the power supply installation:
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•
•

Environmental Reporting Features

The MWR 1941-DC router has a temperature sensor to detect over-temperature conditions inside the
chassis. The over-temperature detection trips at 75°C +/- 5%. This condition is reported to the processor
as an interrupt and software then takes action on this interrupt to generate the appropriate alarming. If
the router reaches a temperature of 90°C, the power supply will cycle to prevent the box from exceeding
that temperature in a powered up state.
If the router is operating at an abnormally high temperature, you see the following message on the
console screen:
%SYS-1-OVERTEMP: System detected OVERTEMPERATURE condition. Please resolve cooling problem
immediately!
Some causes of abnormally high router temperature are:
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•
•
Take steps to correct the problem. For information about environmental operating conditions, see
"System Specifications" section on page
Cisco MWR 1941-DC Mobile Wireless Edge Router Hardware Installation Guide
A-2
With the MWR 1941-DC router connected to the power source, is the power LED on the front panel
on?
If not, check the DC input, DC source, and the power supply wiring.
–
Check the power supply connection to the motherboard.
–
If the power LED is still off, the problem might be a power supply failure.
–
Does the router shut down after being on a short time?
– Check the fans. If the fans are not working, the router will overheat and shut itself down.
– If the fans are not working, check the power supply connections to the fans.
– Ensure that the chassis intake and exhaust vents are clear.
Check the environmental site requirements in the
Does the router partially boot, but the LEDs do not go on?
Check for a power supply failure by inspecting the power LED on the front panel of the router.
–
If the power LED is on, the power supply is functional.
If the power LED is not on, refer to the Cisco Information Packet for warranty information or
–
contact customer service.
Fan failure
Air conditioner failure in the room
Air blockage to cooling vents
"System Specifications" section on page
1-9.
Appendix A Troubleshooting
1-9.
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