Power Supply Failure; Fan Tray Failure; Lpu Failure - HP FlexFabric 7900 Series Installation Manual

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Power supply failure

When a power supply is operating correctly, its input and output LEDs are steady green. When its input
or output LED is red, the power supply is faulty. To troubleshoot the power supply:
1. Verify that the power supply model is as required. For more information about power supplies
available for the switch, see
2. Check for loose power cord connection, and reconnect the power cord. If the power cord is
broken, replace it.
3. Verify that the power supply is fully seated in the slot. For more information, see
"Installing/removing a power
4. Verify that the power source is supplying power at the correct voltage.
5. Verify that the power supply does not have problems such as output short-circuit, output
over-current, output over-voltage, input under-voltage, or over temperature.
6. Install the power supply to another empty power supply slot. If the power supply can operate
correctly, the previous power supply slot is faulty. If the power supply cannot operate correctly, go
to the next step.
7. Install a new power supply of the same model into the same slot, and connect it to the same power
input end. If the new power supply can operate correctly, the old power supply has failed. Contact
your sales agent or local service engineer to replace the old power supply.

Fan tray failure

The switch provides a fan tray status LED (FAN) on its rear panel. If the FAN LED is red, the fan tray is
faulty. To troubleshoot the fan tray:
1. Verify that the power supplies are operating correctly. For more information, see
failure."
2. Verify that the air intake and exhaust vents of the chassis are not blocked. If they are blocked,
clean them to keep good ventilation.
3. Remove and re-install the fan tray to make sure it is fully seated in the slot.
4. Verify that the empty LPU slots and power supply slots are installed with blank panels. If not, install
blank panels for them to guarantee good ventilation.
5. Replace the fan tray.
If the failure persists, contact the local agents or technical support engineers.
6.

LPU failure

The switch provides a SLOT LED (indicating the LPU status) on its rear panel. When the LPU is operating
correctly, the SLOT LED is green. When the SLOT LED is red, the LPU is faulty. To troubleshoot the LPU:
1. Verify that the switch software version is compatible with the LPU. If not, upgrade the software to
a compatible version.
"Appendix B FRUs and compatibility
supply."
35
matrixes."
"Power supply