What is a systematic fault-tracing approach when a robot stops unexpectedly?

• A. Replace motor first.
• B. Check power, connections, software, sensor signals, motor status, and recent changes.
• C. Ignore minor alerts.
• D. Check cosmetic damage.

Answer: (B)

A systematic fault-tracing approach means following a structured checklist to identify the real cause rather than guessing. When the robot stops unexpectedly, start with power and battery status to rule out a simple supply issue, then inspect all electrical connections and wiring for looseness or damage. Next, check the software or firmware state, looking for error messages, resets, or anomalies in the code or configuration. Then examine sensor signals to verify they’re giving correct readings and aren’t triggering a fault. After that, assess the motor status and motor controller to determine if a drive component is failing. Finally, review any recent changes—updates to software, new hardware, or configuration tweaks—that could have introduced the issue. This method helps you pinpoint whether the problem lies with power, wiring, software, sensing, motor, or changes, and avoids unnecessary steps like replacing a motor prematurely or ignoring alerts. Cosmetic damage isn’t related to functional faults and won’t explain why the robot stopped.