If an operator finds that the circuit does not turn on, what should be checked first?

The most effective initial step when a circuit does not turn on is to inspect all connections for tightness. This is because loose connections can lead to intermittent power supply or complete failure for the circuit to function. It ensures that there is a proper electrical pathway and that the circuit components are receiving the required voltage.

Checking the connections first can help identify a simple yet common problem that could be the root of the issue without needing to delve deeper into more complex components like batteries or control devices. Ensuring tight connections can often resolve the problem right away and save time from troubleshooting other potential causes.

While checking battery voltage and the integrity of control devices are important steps in diagnosing electrical issues, they typically come after confirming that all physical connections are secure. Operating instructions can provide useful guidance, but they are usually referenced after ensuring that basic physical checks, such as the tightness of connections, are completed.