What is NOT one of the power-up steps for the DMR?

The correct answer highlights a step that is not typically included in the power-up procedure for the DMR (Digital Mobile Radio) system. Each of the other listed steps is integral to the proper initialization and operation of the DMR, focusing on ensuring that all components in the network are correctly powered and functioning.

When power is applied to the system, checking hubs and ensuring that they indicate powered status is crucial because it verifies that the network infrastructure is operational. Similarly, applying power to the HMI (Human-Machine Interface) and powering up the ITUs (Interface Transition Units) are necessary to establish communication and functionality within the system.

The operation of the HMI generally comes after these initial power-up procedures are completed. Therefore, while powering up the HMI is an important step, it does not represent one of the core initial power-up actions performed within the DMR’s operational start sequence. This understanding of the sequence helps ensure that technicians follow the proper protocol for effective system performance.