Yamaha DSP-AX2700, Service Manual

Page: 127 / 173

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-V2700/DSP-AX2700
127
★
All voltages are measured with a 10M
Ω
/V DC electronic voltmeter.
★
Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
NET 3/3
1.6
5.0
0
5.0
5.0
5.0
5.0
5.0
11.8
0.1
0
0.4
0
3.3
0
5.0
0
2.5
2.5
2.5
5.0
0
0
0
3.3
1.6
0.1
2.2
1.7
0
1.7 1.7 1.7
1.7 1.6
A-1
3.3
0.1 0.1
0.1
0
0.1
NET
AUDIO DAC
DAC FOR VCXO
To NET 1/3
To NET 1/3
to DSP_CB562
Page 111 E1
IC752 : NJM4565M
Dual operational amplifier
8
2, 6
3, 5
1, 7
4
V+
–INPUT
+INPUT
V–
OUTPUT
Functional Block Diagram
(1) Open-drainoutputforthePCM1782
NOTE: Signal names in parentheses ( ) areforthe PCM1781.
Power Supply
Enhanced
Multilevel
Delta-Sigma
Modulator
VOUTL
4 /8
Oversampling
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
VCOM
System Clock
A
GND
V
CC
ZER
OR/ZER
O
A
(1)
(ZER
O
A
)
ZER
O
L/NA
(1)
Output Amp
and
Low-Pass Filter
DAC
VOUTR
(FMT)
ZEROA
VOUTL
VOUTR
VCOM
AGND
VCC
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
IC751 : PCM1781DBQR
Audio digital-to-analog converter
IC754 : BH2220FVM-TR
8bit 3ch D/A converter
1 AO1
2 AO2
3 AO3
4
8
7
6
5 V
CC
LD
CLK
DI
GND
V
CC
V
CC
V
CC
R-2R
DAC
8bitREG
+
DEC
R-2R
DAC
8bitREG
+
DEC
R-2R
DAC
Power on reset
8bitREG
+
DEC
Serial
Interface
IC753 : SN74LVC3GU04DCTR
Triple inverter gate
1
2
3
4
8
7
6
5
1A
3Y
2A
GND
V
CC
1Y
3A
2Y
POINT A-1 Pin 6 of IC753