43
CX-3311
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Check 10: Is the audio circuit OK?
<Outline> The serial 3 lines digital DACCLK, output from DVD-LSI (IC1501), are converted to analog audio
signal at Audio-DAC (IC1801) and are output from the HOST I/F connector (CN1901).
Simultaneously, the analog MUTE signal is also output from DVD-LSI (IC1501) via the HOST I/F connector.
The digital audio signal (IECOUT) is also output from DVD-LSI (IC1501) via the HOST I/F connector.
· Please implement IEC check in Check No.6 for CXK8100 and CXK8101.
Check No.1 – 5 are not necessary as analog audio output is not supported.
· Please implement 3-wire digital output, LO and RO check in Check No.1 – 5 for CXK8102.
Check No.6 is not necessary as IEC is not supported.
CN1901
HOST I/F
IECOUT
LRCK
LO
ADOUT
SRCK
RO
GNDAU
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 the “DGND1” test point at the reference.
In case of NG, check the applicable line, periphery of major components in the above drawing,
soldering of the peripheral components and defective components.
No.
Check point 1 (stylus) Specification value 1
Specification value 2 Reference waveform
1
ADOUT
VCC33V - 0.6 V or more
0.4 V or less
Waveform 1
2
SRCK
VCC33V - 0.6 V or more
0.4 V or less
Waveform 2
3
LRCK
VCC33V - 0.6 V or more
0.4 V or less
Waveform 3
GND
Fig 10.2: Serial 3 lines specification value
Side A
Fig 10.3: Serial 3 lines check points
IC1801
Audio-DAC
IC1501
DVD-LSI
Specification
value 1
Specification
value 2
IC1501 149pin SRCK signal
IC1501 150pin LRCK signal
IC1501 151pin ADOUT signal
DGND1