Checking The Power Subsystem - Cisco WAE-674-K9 - Wide Area Application Engine 674 Hardware Installation Manual

Chapter 6 Troubleshooting the System Hardware
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Checking the Power Subsystem

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Depending on your device configuration, some of the error messages might not
appear when you run the diagnostic programs.
If diagnostic error messages appear that are not listed in the tables, make sure that
your device has the latest levels of BIOS and diagnostics microcode installed.
Power problems can be difficult to solve. For example, a short circuit can exist
anywhere on any of the power distribution buses. Usually a short circuit will cause
the power subsystem to shut down because of an overcurrent condition.
To perform a general procedure for troubleshooting power problems, follow these
steps:
Power down the device and disconnect all AC power cords.
Check for loose cables in the power subsystem. Also check for short circuits. For
example, check if there is a loose screw that is causing a short circuit on a circuit
board.
Remove adapters and disconnect the cables and power connectors to all internal
and external devices until the device is at the minimum configuration required to
start it.
Reconnect all AC power cords and power up the device. If the device starts up
successfully, replace adapters and devices one at a time until the problem is
isolated. If the device does not start up from the minimal configuration, replace
components of a minimal configuration one at a time until the problem is isolated.
To use this method, it is important to know the minimum configuration required
for a system to start. The following are the minimum operating requirements:
• One power supply
Power backplane
•
Cisco Wide Area Application Engine 7341, 7371, and 674 Hardware Installation Guide

Checking the Power Subsystem

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