Pioneer VSX-1018AH-K Service Manual page 30

1
A
A
Check that the data and clock signals are output.
IC101 (Pin 23) DIRM (Master clock)
Is there
No
a master clock
output?
(0 V ⇔ 3.3 V)
Yes
B
IC101 (Pin 24) DIRL (LR clock)
Is there
No
a LR clock
output?
(0 V ⇔ 3.3 V)
Yes
IC101 (Pin 25) DIRD (Data)
C
Is there
No
a data
output?
(0 V ⇔ 3.3 V)
Yes
DIRB (Bit clock)
IC101 (Pin 26)
Is there
No
a bit clock
output?
(0 V ⇔ 3.3 V)
Yes
D
To Step 7-2
E
F
30
1
2
Is the
voltage Pin 31
No
(PDN input signal)
of IC101 at
5 V?
Check the other assy.
(peripheral circuit of
the microcomputer)
No
Replace IC101.
Replace IC101.
Replace IC101.
Replace IC101.
2
3
Step 7-2: Switch
Check that the data and clock signals are output.
IC202 (Pin 4)
Is there
a data
output?
(0 V ⇔ 3.3 V)
Yes
IC202 (Pin 7)
Is there
a bit clock
output?
(0 V ⇔ 3.3 V)
Yes
IC202 (Pin 12)
Is there
a LR clock
output?
(0 V ⇔ 3.3 V)
Yes
IC202 (Pin 9)
Is there
a master clock
output?
(0 V ⇔ 3.3 V)
Yes
To Step 7-3
VSX-LX51
3
4
S2DT (Data)
No
S2BC (Bit clock)
No
S2LR (LR clock)
No
S2MC (Master clock)
No
At COAX, OPT, HDMI or SPDIF input
Is the
No
voltage Pin 1 of
IC202 at
0 V?
Check the path
Yes
between Pin 1 of IC202
and microcomputer.
Replace IC202.
At USB input
Is the
No
voltage pin 1
of IC202 at
5 V?
Check the path
Yes
between Pin 1 of IC202
and microcomputer.
Replace IC202.
4