Honda ACCORD HYBRID 2005 Service Manual page 2030

Audio System
S o u n d Q u a l i t y D i a g n o s i s (cont'd)
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-SDBA
100) into the audio unit.
2. Play track No. 13 (sweep f r o m 500 Hz to 35 Hz) at a
n o r m a l , or slightly h i g h e r t h a n n o r m a l , v o l u m e
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 w i t h the
p r o b l e m .
• If vibrations or poor sound quality is heard, go to
step 4.
• If no vibrations or poor sound quality is heard, go
to sound j u d g i n g (see page 23-64).
4. Choose the appropriate track f r o m 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 diagnosis of the cause.
NOTE: W h e n y o u get to the track that recreates the
p r o b l e m , select the repeat f u n c t i o n 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.
Special Tools Required
Diagnostics CD 07AAZ-SDBA100
Sound judging
Do this test to compare overall sound quality, i m a g i n g ,
and dynamics between the customer's vehicle and a
k n o w n - g o o d vehicle. Only use a vehicle of the same
model and t r i m 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 w e r e w r i t t e n d o w n before beginning
the test.
2. Insert the audio diagnostic CD (T/N 07AAZ-SDBA
100) into the audio unit.
3. Play tracks No. 7 to 12 (sound quality, m i d l a n d ,
dynamics, and i m a g i n g demonstration tracks) at a
n o r m a l , or slightly h i g h e r t h a n n o r m a l , v o l u m e
level. Write d o w n the v o l u m e setting being used.
4. Listen to areas of the track that stand out as being
either real clear or poorer than other areas of the
track.
5. In a k n o w n - g o o d vehicle, insert the audio
diagnostic CD (T/N 07AAZ-SDBA100) into the audio
unit.
6. Play the tracks at the same v o l u m e 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 real clear or poorer than other areas
of the track.
23-64