Audio System Symptom Troubleshooting - Radio has interference

Radio has interference NOTE: Inspect the quality of radio reception in a plan, open space away from office buildings. If it is very distant from the nearest radio station, or close to a high-voltage power line, or is in a mountain or building valley, the reception would naturally be poor. So be careful with location selection. Check if the interference is continuous regardless of location. Is it continuous regardless of place?
YES | - | Go to Step 2 .
NO | - | Operation is normal.■
Check whether the interference is static or another radio station. Is it static interference?
YES | - | Operation is normal.■
NO | - | Faulty audio unit.■