Sound Quality Diagnosis - Frequency Sweep

Sound Quality Diagnosis - Frequency Sweep

Special Tools Required

- Diagnostics CD 07AAZ-SDBA100

Frequency Sweep

Do this test to find rattles or reverberation that may cause a perception of poor sound quality.

1. Insert the audio diagnostic CD (T/N: 07AAZ-SDBA100) into the navigation unit or audio unit.

2. Play track No. 13 (sweep from 500 Hz to 35 Hz) at a normal, or slightly higher than normal, volume level.

3. Listen to each speaker for poor sound quality or reverberations caused by specific frequencies. Use the voice-over to estimate the frequency that causes the vibration. Use the audio unit's fader and balance settings to help isolate the channel with the problem.
- If vibrations or poor sound quality are heard, go to step 4.

- If no vibrations or poor sound quality are heard, go to sound judging.

4. Choose the appropriate track from No. 14 to 25 (small range frequency sweep) or 26 to 53 (single frequencies) to recreate the frequency that caused the poor sound quality or vibration located in step 3: this aids in diagnosing the cause.
NOTE: When you get to the track that recreates the problem, select the repeat function on the navigation unit or audio unit; this will help you isolate the cause.

5. Replace or insulate the source of the vibrations or, if the speaker is the source of the poor sound quality, replace it.