What is the first step in diagnosing a malfunctioning machine?

• A. Check power and safety interlocks, then verify basic operation conditions.
• B. Inspect lubrication system.
• C. Replace defective parts.
• D. Increase running speed to observe behavior.

Answer: (A)

The first step in diagnosing a malfunctioning machine is to confirm it’s powered up and that all safety interlocks are functioning, then verify basic operation conditions. This establishes whether the issue might be a simple power problem, a tripped interlock, or an improper setup that prevents the machine from running. By ensuring there is power, safety devices allow operation, and the basic setup is correct (like proper mode, guards in place, doors closed), you create a safe, reliable starting point for any further testing. If these basics aren’t in place, you’ll misinterpret symptoms or risk injury when you push the machine to operate.

Inspecting the lubrication system is important for wear or friction issues, but it should come after you’ve ruled out power, safety, and basic readiness. Replacing defective parts at this stage is premature without identifying what actually caused the malfunction. Increasing running speed to observe behavior is unsafe and unlikely to reveal a true cause, since it can mask problems or cause further damage before you know what’s wrong.