Pioneer VSX-820-K Service Manual page 27

5
QQ
3 7 63 1515 0
Step 5: DIR
Check that the S/PDIF signal is output.
Check that changes by pulling out and inserting the digital input lines.
IC110 (Pins 3, 5)
Can
observe the
digital signal
?
(0 V ⇔ 3.3 V)
Yes
IC109 (Pins 61, 63) OPTICAL (Pin 61: OPT2, Pin 63: OPT1)
Can
observe the
digital signal
?
(0 V ⇔ 3.3 V)
Yes
IC109 (Pin 67)
Can
observe the
digital signal
?
(0 V ⇔ 3.3 V)
Yes
Check that it changes in the Playback and Pause modes of
the USB (iPod).
TE
L 13942296513
IC109 (Pin 71)
Can
observe the
digital signal
?
(0 V ⇔ 3.3 V)
Yes
Check that the data and clock signals are output.
IC109 (Pin 10)
Is there
a master clock
output?
(0 V ⇔ 3.3 V)
Yes
IC109 (Pin 16)
Is there
a LR clock
output?
(0 V ⇔ 3.3 V)
Yes
IC109 (Pin 14)
www
Is there
a data
output?
. (0 V ⇔ 3.3 V)
Yes
5
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6
OPTICAL (Pin 3: OPT2, Pin 5: OPT1)
No Check the path to OUTPUT PIN of
JACK105, JACK106.
No
Check the path to pins 4, 6 of
IC110 or replace IC110.
COAX
No
Check the path to pins 10-13
of IC110 or replace IC110.
VSX-820-K ONLY
From USB Assy
No
Check the path to CP105 connector.
Check the USB Assy.
DIR_MCK (Master clock)
Is the
No
No
voltage of PDN
IC109-pin 31
3.3 V?
Check the MAIN Assy.
DIR_LRCK (LR clock)
No
Replace IC109.
DIR_SDTO (Data)
x No ao u163
y
Replace IC109.
i
6
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7
2 9
8
IC109 (Pin 15)
Is there
a bit clock
output?
Yes
Switch
IC106 (Pin 4)
Is there
a master clock
output?
Yes
IC106 (Pin 7)
Is there
a LR clock
output?
Q Q
3 6 7 1 3 1 5
Yes
IC106 (Pin 9)
Is there
a bit clock
No
output?
Yes
To Step 6
co
.
VSX-820-K
7
8
9 4 2 8
DIR_BCK (Bit clock)
No
Replace IC109.
(0 V ⇔ 3.3 V)
DAI_MCK (Master clock)
No
(0 V ⇔ 2.5 V)
DAI_LRCK (LR clock)
No
(0 V ⇔ 2.5 V)
0 5 8 2 9 9 4 2 8
DAI_BCK (Bit clock)
No
(0 V ⇔ 2.5 V)
Is the
No
voltage of
IC106-pin 1
0 V?
Check the path
Yes
between IC106-pin 1
and MAIN Assy.
Replace IC106.
*IC106 Pin 1
0 V : DIR
3.3 V : HDMI
m
8
9 9
A
B
C
9 9
D
E
F
27