Pioneer VSX-816-S Service Manual - Page 136

Step 4: Audio Out check, HREQ/TREQ Refer to Fig. 1 and 2

Get Pioneer VSX-816-S PDF manuals and user guides View all Pioneer VSX-816-S manuals
Add to My Manuals
Save this manual to your list of manuals

Page 136 highlights

1 2 B HREQ/TREQ (Refer to Fig. 1 and 2) A Are HREQ and TREQ high? Yes HREQ and TREQ should be No high during operation. Check the pattern in the path. Check the MOTHER Assy. Replace IC762, etc. CN701 (pins 2,3) D+/D- D+ and D- should have Are there the waveforms waveform during normal No condition. B like figure? Check the pattern in the path. Check the MOTHER Assy. Replace IC762, etc. 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) No Check the output from IC701 (pin 66). BCLK Is there a bit clock No Check the output from signal IC701 (pin 62). D ? Yes IC781 (pin 4) LRCK Is there a L/R clock signal ? No Check the output from IC701 (pin 63). Yes IC781 (pin 3) DATA E Is there DATA signal ? Yes No Check the output from IC701 (pin 67). F 3 4 Fig. D+ Fig. D- X: 1 µsec/div, Y: 2 V/div X: 1 µsec/div, Y: 2 V/div IC781 (pins 10,11) LOUT/ROUT Are there audio signal ? No Replace IC781. Yes Check the parts and pattern between IC781 and CN702. 136 VSX-816-K 1 2 3 4

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
VSX-816-K
136
1
2
3
4
1
2
3
4
C
D
F
A
B
E
Step 4: Audio Out check
Is there
a master clock
signal
?
Check the parts and
pattern between IC781
and CN702.
Operation of IC701 is OK.
To STEP 4
HREQ and TREQ should be
high during operation.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
Check the output from
IC701 (pin 66).
Yes
No
Are
HREQ and TREQ
high?
Yes
No
D+ and D- should have
waveform during normal
condition.
Check the pattern in the path.
Check the MOTHER Assy.
Replace IC762, etc.
Are
there the waveforms
like figure?
Yes
No
IC781 (pin 1)
HREQ/TREQ (Refer to Fig. 1 and 2)
MCK
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 bit clock
signal
?
Check the output from
IC701 (pin 62).
Yes
No
IC781 (pin 2)
BCLK
Is there
a L/R clock
signal
?
Check the output from
IC701 (pin 63).
Yes
No
IC781 (pin 4)
LRCK
Is there
DATA signal
?
Check the output from
IC701 (pin 67).
Yes
No
IC781 (pin 3)
DATA
Are there
audio signal
?
Replace IC781.
Yes
No
IC781 (pins 10,11)
LOUT/ROUT
B