In troubleshooting a load controlled by a control string, what should the technician check first?

In troubleshooting a load controlled by a control string, checking the proper voltage applied across the load is essential as it serves as the foundation for the entire electrical system's functionality. An adequate voltage supply is necessary for the load to operate correctly. If the voltage is insufficient or absent, the load will not function regardless of other factors. By measuring the voltage at the load, the technician can quickly determine if the issue lies with the power supply or if there may be another underlying problem, such as a faulty connection or defective load.

Understanding the voltage conditions helps to ensure that power is being correctly delivered before examining other aspects of the circuit, such as current flow, resistance, or continuity. This step effectively narrows down the potential causes of malfunction when troubleshooting electric systems, allowing for a more efficient repair process.