Pioneer AVIC-X940BT, Service Manual

Page: 63 / 292

AVIC-X940BT/XNUC
63
5 6 7 8
5 6
7
8
C
D
F
A
B
E
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 (CN1952).
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).
CN1952
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 with DGND1 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) Specification value 1 Specification value 2 Reference waveform
1 ADOUT VCC33V - 0.6 V or higher 0.4 V or lower Waveform 1
2 SRCK VCC33V - 0.6 V or higher 0.4 V or lower Waveform 2
3 LRCK VCC33V - 0.6 V or higher 0.4 V or lower 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
149pin SRCK signal
150pin LRCK signal
151pin ADOUT signal
DGND1