What should you check if you hear constant buzzing on a line?

• A. Pair continuity, check for short circuits, inspect connectors for corrosion.
• B. Increase transmitter power.
• C. Replace earphone.
• D. Ignore.

Answer: (A)

When you hear a constant buzzing on a line, the issue is usually a fault in the line or its connectors rather than in the earphone or transmitter. The right approach is to verify the line’s integrity by checking pair continuity, looking for short circuits, and inspecting connectors for corrosion. Confirming pair continuity ensures the two conductors are connected end to end; a break would produce high resistance and audible noise. Checking for shorts helps identify unintended connections between conductors that can create constant buzz. Inspecting connectors for corrosion is important because oxidation or corrosion increases contact resistance and can cause persistent noise or crackling.

If you find a fault, repair or replace the affected section or connectors and re-test to restore a clean, continuous circuit. Increasing transmitter power won’t remove line noise and could aggravate the problem, replacing the earphone won’t address a line fault, and ignoring it leaves the issue unresolved.