Yamaha RX-797, Service Manual

Page: 34 / 46

A B C D E F G H
1
2
3
4
5
6
I J K L
7
8
RX-797
34
* All voltages are measured with a 10M
Ω
/V DC electronic volt meter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to
those originally installed.
* Schematic diagram is subject to change without notice.
■
SCHEMATIC DIAGRAM (XM)
SMUTE/CSN
MCLK
ACKS/CCLK
DIF0/CDTI
DZFL
VDD
VSS
AOUTL
P/S
AOUTR
6
PDN
5
1
7
8
LRCK
BICK
SDTI
4
2
3
10
9
11
12
13
14
VCOM
DZFR 15
12
ATT
ATT
µ
P
INTERFACE
AUDIO
DATA
INTERFACE
DE-EMPHASIS
CONTROL
CLOCK
DIVIDER
∆ ∑
MODULATOR
∆ ∑
MODULATOR
8X
INTERPOLATOR
8X
INTERPOLATOR
SCF
SCF
IC25 : AK4384ET
D/A Convertter
IC24 : SN74LV245APWR
Octal 3-State Bus Transceivers
1 DIR
2 A1
3 A2
4 A3
5 A4
6 A5
7 A6
8 A7
9 A8
10 GND
20 V
CC
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
19 ENG
IC26 : NE5532DR
Dual OP-Amp
– +
OUT
1
–IN
1
–V CC
+V
CC
OUT
2
1
2
3
4 5
+IN 1 –IN 2
+IN 2
– +
6
7
8
IC27 : PQ05RD11
Rgulator
VIN VO
CV
GND
4
3
2 1
I C
IC23 : SN74AHCT1G32DCKR
Single 2 Input OR
1
2
3 4
5
Y
A
B
GND
VCC
0
0
0 0
0
0 0 0
~
~ ~
0 0 3.3
3.3 3.3
3.3
1.2 1.2 1.2 1.2
0
1.2
0
0
0
0
0
0
0
0
1.6
1.6
3.3
3.3
3.3
3.3
3.3
3.3
1.2
2.1
0
5.1
5.1
4.8
4.8
0
0
0
0
0
~
~
~
0
0
0
0
0
0
0
0
0
0
0 0
0.4
0
0
7.2
-7.1
11.0 11.0
11.0 5.3 0.4 4.8
5.1 5.1 3.3
3.3
3.3
5.3
5.1
5.0
5.0
AC9.2
5.1
0
0
4.8
5.1 5.1
5.1
2.6
2.6
2.6
~
0
0
0
~
~
~
3.3
3.3
3.3
3.3
3
T
O
FUNCTION (2) CB604
P
age 31 E-8
T
O
FUNCTION (1)
W506
P
age 31 C-4
TO POWER TRANSFORMER
Point
e
(Pin 28 of IC1)