Pioneer VSX-1018AH-K Service Manual page 29

5
Step 4: 3 V to 5 V conversion
IC702
Do
No
convert 3 V into
Replace IC702.
5 V for input?
Yes
To Step 5
Step 5: 5 V to 3 V conversion
IC701
Do
No
convert 5 V into
Replace IC701.
3 V for input?
Yes
To Step 6
Step 6: X'tal
IC503 (Pin 6)
Is there
No
Replace IC503 or X531.
a 24.576 MHz
output?
Yes
IC503 (Pin 12)
Is there
No
Check the pattern to pin 10 of IC851.
a 24.576 MHz
Replace IC851.
output?
Yes
IC503 (Pin 10)
Is there
No
Check the pattern to pin 80 of IC401.
a 24.576 MHz
Replace IC401.
output?
Yes
IC503 (Pin 8)
Is there
No
Check the pattern to pin 30 of IC101.
a 24.576 MHz
Replace IC101.
output?
Yes
To Step 7
5
6
Step 7
When the COAX or OPT is input, go to Step 7-1.
When the USB is input, go to Step 7-2.
When the HDMI (SPDIF line) is input, go to Step 7-1.
Used Source
[dts HD High Resolution Audio], [dts HD LBR],
[Dolby Digital Plus], [2ch of 48kHz sampling rate or less],
[Other compression stream]
When the HDMI (I2S line) is input, go to Step 7-3.
Used Source
[dts HD Master Audio], [Dolby True HD],
[PCM or LPCM of 88.2kHz sampling rate or more],
[LPCM Multi ch]
When the HDMI (SACD) is input, go to Step 7-5.
Used Source [SACD]
Step 7-1: DIR
Check that the S/PDIF signal is output.
Check that changes by pulling out and inserting the
digital input lines.
IC101 (Pins 1, 3, 5 (VSX-LX51 only)) OPTICAL
Can
observe the
digital signal
?
IC101 (Pin 7)
Can
observe the
digital signal
?
IC101 (Pins 42, 44) COAX
Can
observe the
digital signal
?
Check that it changes in the Playback and Pause modes of
the HDMI.
IC101 (Pin 48)
Can
observe the
digital signal
?
A
VSX-LX51
6
7
No Check the OPTICAL IN JACK,
and parts and patterns in the path.
(0 V ⇔ 4 V)
Yes
FRONT OPTICAL
No Check the FRONT IN ASSY, and
parts and patterns in the path.
(0 V ⇔ 4 V)
Yes
No
Check the parts and patterns
in the path.
(1.65 V center, amplitude more than 0.2 Vp-p)
Yes
From HDMI ASSY
No
Check the HDMI ASSY, and the parts
and patterns in the path.
(0 V ⇔ 3.3 V)
Yes
7
8
A
B
C
D
E
F
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