Honda Accord 2008 Manual page 2551

07/11/02 09:51:51 61TA0000_230_0107
Audio System
Sound Quality Diagnosis (cont'd)
Special Tools Required
Diagnostics CD 07AAZ-SDBA100
Frequency Sweep
Do this test to find rattles or reverberations that may
cause a perception of poor sound quality.
1. Insert the audio diagnostic CD (T/N 07AAZ-
SDBA100) into the 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 (see page 23-106).
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 witnessed in
step 3; this aids in diagnosis of the cause.
NOTE: When you get to the track that recreates the
problem, select the repeat function on the audio
unit, this will help you isolate the cause.
5. Replace or insulate the source of the vibration or, if
the speaker is the source of the poor sound quality,
replace it.
23-106 23-106
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Special tools required
Diagnostics CD 07AAZ-SDBA100
Sound Judging
Do this test to compare overall sound quality, imaging,
and dynamics between the customer's vehicle and a
known-good vehicle. Only use a vehicle of the same
model and trim level for this test.
1. In the customer's vehicle, set the bass, treble, fader,
and balance settings to the customer's normal
settings that were written down before beginning
the test.
2. Insert the audio diagnostic CD (T/N 07AAZ-
SDBA100) into the audio unit.
3. Play tracks No. 7 to 12 (sound quality, midland,
dynamics, and imaging demonstration tracks) at a
normal, or slightly higher than normal, volume
level. Write down the volume setting being used.
4. Listen to areas of the track that stand out as being
either very clear or poorer than other areas of the
track.
5. In a known-good vehicle, insert the audio
diagnostic CD (T/N 07AAZ-SDBA100) into the audio
unit.
6. Play the tracks at the same volume level and the
same bass, treble, balance, and fader settings as
used in step 3 in the customer's vehicle.
7. Listen to the same area of the track that stood out
as being either very clear or poorer than other
areas of the track.
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