Yamaha RX-797 Service Manual page 34

A B
RX-797
SCHEMATIC DIAGRAM (XM)
1
3
2
0
1.6
3.3
1.6
0
3
0
0
3.3
0
4
5
6
7
IC24 : SN74LV245APWR
Octal 3-State Bus Transceivers
DIR 1
A1 2
A2 3
A3
8 4
A4 5
A5 6
IC23 : SN74AHCT1G32DCKR
Single 2 Input OR
A6 7
A7 8
A 1 5 VCC
9
A8
B 2
GND 10
GND 3 4 Y
34
C D E
0
1.2
0
3.3
5.1
0
3.3
0
5.1
3.3 3.3
0
3.3
3.3
0
5.3
0
20 V CC
19 ENG
18 B1
17 B2 IC26 : NE5532DR IC27 : PQ05RD11
Dual OP-Amp Rgulator
16 B3
15 B4
14 B5
VIN 1
OUT 1 8 +V
1 CC
13 B6
–IN 1 2 7 OUT 2
+ – + – I C
12 B7
+IN 1 3 6 –IN 2
–V 4 5 +IN
11 B8 CC 2
3
GND
F G
4.8 0
4.8 3.3
0 1.2
~
~ 0
~ ~
2.1
0
0
0
0
3.3 0
~
~
0 5.1
~ 0
4.8 2.6
0 2.6
0 2.6
5.1 5.1
3.3 5.1 5.1 11.0
0
3.3 5.1
5.1
3.3
0.4
0 0
0
IC25 : AK4384ET
D/A Convertter
P/S MCLK
9 1
DE-EMPHASIS CLOCK
CONTROL DIVIDER
SMUTE/CSN
6 µP
ACKS/CCLK 7
INTERFACE
DIF0/CDTI 8
∆ ∑
8X
2 VO
ATT
LRCK INTERPOLATOR MODULATOR
4 AUDIO
BICK 2 DATA
SDTI 3 INTERFACE ∆ ∑
8X
ATT
MODULATOR
INTERPOLATOR
4 CV
5
PDN
H I
0
7.2
0 0
0
0
0
-7.1
AC9.2
11.0
5.0
5.0
TO POWER TRANSFORMER
0
Point e (Pin 28 of IC1)
VDD
14
13 VSS
VCOM
12
DZFR
15
12 DZFL
SCF 11 AOUTL
SCF AOUTR
10
J K L
* 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.