Yamaha RX-V771, Service Manual

Page: 113 / 148

A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
RX-V771
114
DIGITAL 8/8
● ⚠印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、
パーツリストに記載されている部品を使用してください。
● 本回路図は標準回路図です。改良のため予告なく変更することがあります。
★
Components having special characteristics are marked
⚠
and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
IC941
IC944 IC943
IC948
IC946
IC949
W941
CB949
CB942 CB948
IC949
CB950
CB947
CB946
IC945
CB945
CB944
CB943
CB941
DIGITAL IN
ANALOG IN
FRONT L
CENTER/
SUBWOOFER
SURROUND BACK L
SURROUND L
(1) Open-drain output for the PCM1782
NOTE: Signal names in parentheses ( ) are for the PCM1781.
Power Supply
Enhanced
Multilevel
Delta-Sigma
Modulator
V
OUT
L
Oversampling
4 x 8
Digital
Filter
With
Function
Control
Audio
Serial
Port
BCK
LRCK
DATA
Serial
Control
Port
Zero Detect
(TEST)
SCK
System
Clock
Manager
MC (DEMP1)
MS (DEMP0)
Output Amp
and
Low-Pass Filter
MD (MUTE)
DAC
V
COM
System Clock
AGND
V
CC
ZEROR/ZEROA
(1)
(ZEROA)
ZEROL/NA
(1)
Output Amp
and
Low-Pass Filter
DAC
V
OUT
R
(FMT)
ZEROA
V
OUT
L
V
OUT
R
V
COM
AGND
V
CC
NC
TEST
16
15
14
13
12
11
10
9
FMT
DEMP0
DEMP1
MUTE
SCK
DATA
BCK
LRCK
1
2
3
4
5
6
7
8
IC941 : PCM1781DBQR
Audio digital-to-analog converter
V
DD
CE
Pin No.
1
2
3
4
5
Symbol
CE
GND
NC
V
DD
V
OUT
Description
Chip Enable Pin ("H" Active)
Ground Pin
No Connection
Input Pin
Output Pin
Vref
4 5
1 2
Current Limit
V
OUT
GND
IC945, 946 : R1172H501D-T1-F
Voltage regulator
V
DD
CE
Vref
3 1
5 2
Current Limit
V
OUT
GND
Pin No.
1
2
3
5
4
Symbol
V
OUT
GND
CE
V
DD
Description
Output Pin
Ground Pin
Chip Enable Pin ("H" Active)
NC No Connection
Input Pin
IC948 : R1172N501D-TR-F
Voltage regulator
IC949 : SN74LVC1G17DCKR
Single schmitt-trigger buffer
1
2
3
5
4
NC
A
GND
VCC
Y
INPUT
A
OUTPUT
Y
L
H
L
H
IC943, 944 : BD9329AEFJ-E2
1ch step-down DC/DC converter
IBIAS
ERR
FB
EN
BST
OUTPUT
VIN
SW
GND
OPEN
SHUTDOWN
COMP
SS
VREF
VREG
OSC
TSD
S
DRV
R
LOGIC
SLOPE
Soft Start
UVLO
VCC
5V
12V
7
5
PWM
OCP
LVS
LVS
6
8
4
3
2
1
DAC
to DIGITAL 5/8 to DIGITAL 7/8
to DIGITAL 6/8
DIGITAL (1)
DOCK
No replacement part available.
サービス部品供給なし
to OPERATION (11)_W4481
Page 115 M6
to VIDEO (3)_W3703
Page 121 J10
(for service)
to VIDEO (3)_CB375
Page 121 J9
to OPERATION (2)_CB459
Page 116 D4
to OPERATION (2)_CB461
Page 116 J4
to OPERATION (2)_CB460
Page 116 F4