Fan Failure; Mpu Failure; Lpu Failure - HP 7500 Series Installation Manual

5. Examine the power supply system. Make sure the power supply system operates correctly and
provides a normal voltage.
6. If the switch has empty power supply slots, plug the power supply into an empty power supply slot,
and verify that the power supply can operate correctly.
7. Plug 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 work correctly, the old power supply fails. Contact the
agents to replace the old power supply.

Fan failure

The fan LEDs on the MPU include an OK LED and a FAIL LED. When the fan assembly is operating
correctly, the OK LED is on, and the FAIL LED is off.
If the fan assembly has failed, the OK LED is off or the FAIL LED is on.
To troubleshoot the fan assembly:
1. Verify that the power supply is operating correctly. For more information, see
system
2. Verify that the air intakes and exhaust vents of the chassis are not blocked. If they are blocked,
clean them to keep good ventilation.
3. Verify that the fan assembly is fully seated. You can unplug the fan assembly, plug it again, and
then fix the screws.
4. Verify that the empty LPU slots and power supply slots are installed with blank filler panels. If not,
install blank filler panels for them to guarantee good ventilation.

MPU failure

The status LEDs on the MPU show the status of a card in the corresponding slot. According to the slot
number of an MPU, you can examine the corresponding LEDs for the MPU.
When the MPU operates correctly, the RUN LED flashes, and the ALM LED is off. When the RUN LED is
off, the MPU fails. To troubleshoot the MPU:
1. Verify that the power supply is operating correctly. For more information, see
system
2. Verify that the MPU model is compatible with the chassis. For more information, see
FRUs and compatibility
3. Press the RESET button of the MPU to reset the MPU. After the MPU is reset, verify that the
corresponding RUN LED is on.
4. Verify that the MPU is fully seated. You can unplug the MPU, plug it again, and make sure the MPU
is fully seated.
5. If the switch has empty MPU slots, plug the MPU into an empty MPU slot, and verify that the MPU
can operate correctly.

LPU failure

The status LEDs on the MPU show the status of a card in the corresponding slot. According to the slot
number of an LPU, you can check the corresponding LEDs for the LPU.
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"Power supply
"Power supply
"Appendix B