Pioneer VSX-516-K Service Manual page 118

1
B
HREQ/TREQ (Refer to Fig. 1 and 2)
A
Are
HREQ and TREQ
high?
Yes
CN701 (pins 2,3)
D+/D-
Are
there the waveforms
B
like figure?
Yes
Operation of IC701 is OK.
To STEP 4
Step 4: Audio Out check
IC781 (pin 1)
MCK
C
Is there
a master clock
signal
?
Yes
IC781 (pin 2)
BCLK
Is there
a bit clock
signal
D
?
Yes
IC781 (pin 4)
LRCK
Is there
a L/R clock
signal
?
Yes
IC781 (pin 3)
DATA
E
Is there
DATA signal
?
Yes
F
118
1
2
HREQ and TREQ should be
No
high during operation.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
D+ and D- should have
waveform during normal
No
condition.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
No
Check the output from
IC701 (pin 66).
No
Check the output from
IC701 (pin 62).
No
Check the output from
IC701 (pin 63).
No
Check the output from
IC701 (pin 67).
2
3
Fig. D+
X: 1 µsec/div, Y: 2 V/div
IC781 (pins 10,11) LOUT/ROUT
Are there
audio signal
?
Yes
Check the parts and
pattern between IC781
and CN702.
VSX-516-K
3
4
Fig. D-
X: 1 µsec/div, Y: 2 V/div
No
Replace IC781.
4