Dell EMC ME4084 Owner's Manual page 61

Before you begin any of the procedures, see the
NOTE: The illustrations show PCM module replacement within the right slot as you view the enclosure rear panel. To
replace a PCM in the left slot, first rotate the module 180º about its longitudinal axis, so that it properly aligns with its
connectors on the back of the midplane.
Removing a PCM
CAUTION: Removing a power supply unit significantly disrupts the enclosure's airflow. Do not remove the PCM until you
have received the replacement module. It is important that all slots are filled when the enclosure is in operation.
Before removing the PCM, disconnect the power from the PCM by either the mains switch (where present) or by physically removing the
power source in order to ensure your system has warning of imminent power shutdown. Ensure that you correctly identify the faulty PCM
before beginning the step procedure.
1. Stop all I/O from hosts to the enclosure. See
NOTE: This step is not required for hot-swapping. However, it is required when replacing both PCMs at once.
2. Use management software to shut down any other system components necessary.
NOTE: This step is not required for hot-swapping. However, it is required when replacing both PCMs at once.
3. Switch off the faulty PCM, and disconnect the power supply cable.
4. If replacing a single PCM using hot-swap, proceed to step 6.
5. If replacing both PCMs, verify that the enclosure was shut down using management interfaces, and that the enclosure is powered off.
6. Verify that the power cable is disconnected.
7. Grasp the latch and the side of the PCM handle between thumb and forefinger, squeeze together and open the handle to cam the
PCM out of the enclosure as shown in the following figure.
Figure 60. Removing a PCM (1 of 2)
8. Grip the handle and withdraw the PCM, taking care to support the base of the module with both hands as you remove it from the
enclosure as shown in the following figure.
ESD precautions.
Shutting down attached hosts.
Module removal and replacement 61