Pioneer VSX-418-K Service Manual page 20

1
A
A
IC952 (pin 14)
Do
No
convert 3 V into
5 V for pin 6
input?
Yes
IC952 (pin 13)
Do
No
convert 3 V into
B
5 V for pin 7
input?
Yes
To Step 5
Step 5: X'tal
IC802 (pin 2)
C
Is there
No
a 24.576 MHz
output?
Yes
IC802 (pin 7)
Is there
No
a 24.576 MHz
output?
Yes
D IC802 (pin 5)
Is there
No
a 24.576 MHz
output?
Yes
To Step 6
E
F
20
1
2
Replace IC952.
Replace IC952.
Replace IC802 or X801.
Check the path to pin 45 of IC801.
Replace IC802.
Check the path to pin 30 of IC601.
Replace IC802.
2
3
Step 6: DIR
Check that the S/PDIF signal is output.
Check that changes by pulling out and inserting the
digital input lines.
IC601 (pin 1)
Can
observe the
digital signal
?
(0 V <-> 4 V)
Yes
IC601 (pin 5)
Can
observe the
digital signal
?
(0 V <-> 4 V)
Yes
IC601 (pin 44)
Can
observe the
digital signal
?
(1.65 V center, amplitude more than 0.2 Vp-p)
Yes
IC601 (pin 42)
Can
observe the
digital signal
?
(1.65 V center, amplitude more than 0.2 Vp-p)
Yes
Check that the data and clock signals are output.
IC601 (pin 27)
Is there
a master clock
output?
(0 V <-> 3.3 V)
Yes
IC601 (pin 24)
Is there
a LR clock
output?
(0 V <-> 3.3 V)
Yes
B
VSX-418-K
3
4
IN1 (OPT: TV/SAT)
No Check the DIGITAL INPUT Assy,
and parts and patterns in the path.
IN2 (OPT: CD-R/TAPE/MD)
No Check the DIGITAL INPUT Assy,
and parts and patterns in the path.
IN3 (COAX: DVD/LD)
No
Check the parts and patterns
in the path.
IN4 (COAX: CD)
No
Check the parts and patterns
in the path.
MCKO2 (Master clock)
Is the
No
No
voltage of PDN
IC601-pin 31
5 V?
Check the other assy.
(surrounding of the
microcomputer)
Replace IC601.
LRCK (LR clock)
No
Replace IC601.
4
No