VSX-LX70
69
5
6
7
8
5
6
7
8
C
D
F
A
B
E
Step 4: Audio Out check
Is there
a SPDIF
signal
?
Operation of IC701 is OK.
To STEP 4
Check the output from
IC701 (pin 105).
Yes
No
Yes
D+ and D- should have
waveform during normal
condition.
Check the pattern in the path.
Check the MOTHER Assy.
Are
there the waveforms
like figure
?
Yes
No
IC701 (pin 105)
SPDIF
CN701 (pins 2,3)
D+/D-
Fig. D+
X: 1
μ
sec/div, Y: 2 V/div
X: 1
μ
sec/div, Y: 2 V/div
Fig. D-
Is there
a SPDIF
signal
?
Check the output from
IC701 (pin 105).
Yes
No
IC741 (pin 2)
SPDIF
Check the parts and
pattern between IC701
and CN702.
Are there
audio signal
?
Replace IC741.
Yes
No
IC741 (pin 4)
SPDIF
B