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5
Check 10: Is the audio circuit OK?
<Outline> The serial 3 lines digital output + DACCLK, output from DVD-LSI (IC1501), are converted to analog audio
signal at Audio-DAC (IC1801) and are output from the HOST I/F (CN1901).
Simultaneously, the analog MUTE signal is also output from DVD-LSI (IC1501) via the HOST I/F.
The digital audio signal (IECOUT), output from DVD-LSI (IC1501), is output via CN1852.
IC1501
DVD-LSI
LRCK
ADOUT3
SRCK
IEC
Fig 10.1: Audio circuit
<Check method> Playback DVD-REF-A1 TITLE 2 CHAPTER 1 (48 k/16 bit 1 kHz 0 dB),
and check with DGND being the reference.
In case of NG, check the applicable line, periphery of major components as described in the above drawing,
soldering of the peripheral components and defective components.
NO.
Check point 1 (stylus)
1
ADOUT3
2
SRCK
3
LRCK
Specification
value 2
Specification
value 1
GND
Fig 10.2: Serial 3 lines specification value
Side A
Fig 10.3: Serial 3 lines check points
5
6
IC1801
Audio-DAC
Specification value 2
Specification value 1
VCC33V-0.6 V or higher
0.4 V or lower
VCC33V-0.6 V or higher
0.4 V or lower
VCC33V-0.6 V or higher
0.4 V or lower
AVH-P7900DVD/RE
6
7
CN1901
HOST I/F
LO
RO
GNDAU
CN1852
Reference waveform
Waveform 1
Waveform 2
Waveform 3
SRCK
LRCK
ADOUT3
7
8
A
B
C
D
E
F
55
8
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