Pioneer SX-LX70SW Service Manual page 30

1
A
Step 4: Audio Clock (Until Switch)
• When a sound is not out with the digital (OPT IN)
signal input.
• When a sound is not out with the analog signal input.
• When a sound is not out with the HDMI. (It is assumed
that failure diagnosis of HDMI Assy has been completed.)
(I2S path)
When the source is "dts HD Master Audio", "Dolby True
HD", "PCM or LPCM at or above the sampling rate of
88.2kHz" or "LPCM Multi ch". → Go to Step 4-3-1
B (S/PDIF path)
When the source is "dts HD High Resolution Audio", "dts
HD LBR", "Dolby Digital Plus", "2ch at or below the
sampling rate of 48kHz), or "other compression streams".
(DSD)
When the source is SACD. → Go to Step 4-3-2
Step 4-1: When a sound is not out with the digital
(OPT IN) signal input
When the source in the digital (OPT IN) or the HDMI
C
path is "dts HD High Resolution Audio", "dts HD LBR",
"Dolby Digital Plus", "2ch at or below the sampling
rate of 48kHz" or "other compression streams".
Check that changes by pulling out and inserting the
digital input lines.
OPT IN (2 inputs)
IC301 (Pins 1,3)
Can
No
observe digital
signal?
D
(0 V ⇔ 4 V)
Yes
IC301 (Pin 48) HDMI S/PDIF IN
Can
No
observe digital
signal?
(0 V ⇔ 3.3 V)
Yes
E Input a digital signal and check with
the state which selected the function.
HDSW
IC651 (Pin 1)
No
Is the voltage
0 V?
Yes
F
30
1
2
→ Go to Step 4-1
→ Go to Step 4-2
→ Go to Step 4-1
Check the parts and patterns in the
path from the OPT IN terminal.
Check the parts and patterns
in the path from the HDMI Assy.
Check the path to the
microcomputer.
2
3
IC301 (Pin 23)
Is there
a master clock
output
(24.576 MHz)?
Yes
IC651 (Pin 11)
Is there
a master clock
input
(24.576 MHz)?
Yes
IC301 (Pin 24)
Is there
a LR clock
output?
Yes
IC651 (Pin 14)
Is there
a LR clock
input?
Yes
IC301 (Pin 25)
Is there
a audio data
output?
Yes
IC651 (Pin 2)
Is there
a audio data
input?
Yes
C
SX-LX70SW
3
4
DIRM
Is the
No
No
voltage of
IC301-pin 31
3.3 V?
Check the path to the
Yes
microcomputer.
Is the output of
No
IC301-pin 36
(DRERR3 )
0 V?
Replace IC301
or IC651.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC301
or IC651.
DIRL
Is there
No
No
abnormality at the
parts and patterns
in the output path?
Replace IC301
or IC651.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC301
or IC651.
DIRD
Is there
No
No
abnormality at the
parts and patterns
in the output path?
Replace IC301
or IC651.
Is there
No
No
abnormality at the
parts and patterns
in the input path?
Replace IC301
or IC651.
4