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5
Check 11 : Audio circuit OK?
The three serial audio signals and DACCLK, output from the DVD-LSI(IC1501), are applied to the IC1821 (Audio DAC),
where they are converted into analog audio signals. These analog signals are output from the HOST I/F.
An analog MUTE signal is also outputted simultaneously.
The digital audio signal (IECOUT) outputted from DVD-LSI (IC1501) is outputted through CN1851.
IC1501
DVD-LSI
Reproduce DVD-REF-A1 Title 2 Chapter1 (48 k/16-bit 1 kHz/0 dB).
Checks are to be conducted using DGND as a reference.
If the locations, listed under "verification location 2", can be verified, there is no need to conduct verifications for
the locations listed under "verification location 1."
If the result is not satisfactory, check to see if there are any problems with resin flux cored solder and other
defects in the applicable line, vicinity of major parts stated in the above diagram and
peripheral components.
Verification location 1
No.
(Sensing pin)
AOUT3
1
SRCK
2
LRCK
3
Rated value 1
GND
5
6
IC1821
LRCK
Audio-DAC
ADOUT3
SRCK
IEC
Fig.11.1 : Audio circuit
Verification
Rated value 1
location 2
IC1501 pin169
VCC33V - 0.6 V or over
IC1501 pin168
VCC33V - 0.6 V or over
IC1501 pin167
VCC33V - 0.6 V or over
Rated value 2
Fig,11.2 : Three serial output rated values
AVH-P7800DVD/UC
6
7
LO
RO
GNDAU
Reference
Rated value 2
waveform
0.4 V or lower
Waveform 1
Waveform 2
0.4 V or lower
0.4 V or lower
Waveform 3
7
8
A
CN1901
HOST I/F
B
CN1851
C
D
E
F
197
8
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