Troubleshoot hardware

Power module issues

Abnormal power module state

Symptom

The LED for the power module is abnormal or a fault occurs during the power module operation.

Common causes

The following are the common causes of this type of issue:

·     The power module model does not match the host.

·     The power module is not correctly installed.

·     The power cord is not securely connected.

·     The temperature of the power module is too high.

·     The power module is faulty.

Troubleshooting flow

Figure 1 shows the troubleshooting flowchart.

Figure 1 Flowchart for troubleshooting power modules

Solution

1.     Identify whether the power module model matches the host model.

2.     Check the power supply system of the device to ensure that the power supply system can provide power correctly to the device.

3.     Identify the LED for the power module to preliminarily determine whether the power module has output short circuit, output overcurrent, output overvoltage, input undervoltage, overheating, and other issues. The power LED status varies by device model. For details, see the hardware manual for the corresponding device.

4.     Check the power module state.

5.     Use the display power command to view the power module state. Identify whether power modules are in Faulty or Absent state.

<Sysname> display power

  Index          Status

  ----------------------

  PWR1          Normal

  PWR2          Absent

You can also use the display alarm command to check power module alarm information.

<Sysname> display alarm

Slot   CPU   Level   Info

-      -     INFO    Power 1 is absent

6.     If the state of a power module is Absent, follow these steps for troubleshooting:

a.     Re-install the power module. Before you re-install the power module, verify that the power connector is intact.

b.     If the state of the power module fails to recover to Normal, install the power module to another slot with a power module that is operating correctly.

c.     If the state of the power module still shows Absent, replace it with a new power module.

d.     If the issue persists, proceed to step 8.

7.     If the power supply state is Faulty, follow these steps for troubleshooting:

a.     Identify whether the power cord is loose or properly connected.

b.     If the power cord is connected properly, identify whether power cord is faulty.

c.     If the power cord is normal, the power module itself may be overheating. Check the dust buildup on the power module. If there is excessive dust, clear the dust, and then reinstall the power module.

d.     If the state of the power module fails to recover to Normal, install the power module to another slot with a power module that is operating correctly.

e.     If the state of the power module still shows Faulty, replace it with a new power module.

f.     If the issue persists, proceed to step 8.

8.     If the issue persists, collect the following information and contact Technical Support:

¡     Results of each step.

¡     The configuration files, log messages, and alarm messages.

Related alarm and log messages

Alarm messages

N/A

Log messages

·     DEV/2/POWER_FAILED

·     DEV/3/POWER_ABSENT