Inspection Procedure 4: Noise Appears at Certain Places when Travelling.


DIAGNOSIS PROCEDURE


STEP 1. Check the noise occur when entering or near a particular structure (building, tunnel, mountain, etc.).


Q. Does the noise occur when entering or near a particular structure (building, tunnel, mountain, etc.)?





STEP 2. After taking the following measures to prevent the noise, check that no noise appears.


(1)Change to a different station with a stronger wave to boost resistance to interference.
(2)Suppress high tones to reduce noise.

Q. Do the following measures eliminate the noise?





STEP 3. Ask the owner about the state of the noise.




  • Place where the noise occurs.
  • Locality conditions (valley, mountain, etc.)
  • Name and frequency of stations affected by noise

Q. Which is the noise, vehicle noise or external noise?





STEP 4. Check that there is no noise.


Q. Does noise still exist?