Yamaha RX-797, Service Manual

Page: 31 / 46

A B C D E F G H
1
2
3
4
5
6
I J K
7
8
RX-797
31
■
SCHEMATIC DIAGRAM (FUNCTION)
* 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.
0.1
0.1
0.1 0.2
4.8
0.2
0.3
0.3
0.3
15.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-14.4
-14.7
-14.7
-14.7 -14.7
0
14.7
0
6.1
6.2
4.8
3.9
3.9
3.9
3.9
3.9
3.9
3.9
3.8
3.9
3.9
11.8
11.8
11.9
14.3
12.2
11.8
11.8
0.1
0.1
0.1
6.2
3.9
3.9
0.1
0.1
0
0
0
0
0
0
0
0
0
0
13.2
-13.2
0
0
0
0
0
0
13.2
-13.2
0
0
0
0
0
0
13.2
-13.2
0
0
0
0
0
0
0.7
0.7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 -14.9
0
15.1
0
0
0
0 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 0
0
0
0
0 0
0
0
0
0
0
14.3
14.3
-14.1
-14.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
7.2
-7.1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
14.9
-14.5
0
0
0
0
4.8
6.2
6.2
7.2 6.2
6.8
6.8
0.5
0.5
-6.1
7.9
0.1
7.9
-7.1
-14.9 -14.9
15.1 15.1
-6.1
0
0
0
0
0
0 0
0 0
6.2
6.2
-6.1
-6.1
0.7
0.7
0
0
0
0
13.4
-13.2
0
0
0
0
0
4.8
4.8 4.8
4.8 4.8
4.8 4.8
5.1
0.1
4.8
4.8 4.8 4.8 4.8 4.8
2.4 2.4 0
0
0 0 0 0 0
0
0
4.8 4.8 4.8 4.8 4.8 4.8 4.8 4.8
4.8
4.8 4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.8
4.1
4.1
4.1
4.1
4.8
-14.7
-14.7
0.1
0
0 0
4.9
3.0
3.6
1.7
1.7 3.6
0.9
0.9
0
4.8
0.1
0.1
4.8
0.1
0.1
0.1
0.1
0.5
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0
4.8 4.5 4.1 4.1 0.3 0.3 0.3 0.3 0.3 0.3 4.7 0 0 0 0 0
0 0
5.6
5.6
5.6
5.6
4.9
4.9
4.9
4.8
4.8
4.8
5.2
5.5
5.5
11.9
11.9
11.2
15.1
12.4
4.8
0.1
0.1
4.2
9.8
1
CD DIRECT AMP ON CD DIRECT AMP OFF
CD DIRECT AMP OFF
CD DIRECT AMP OFF
CD DIRECT AMP ON
TO XM CB23
Page 34 I-5
T
O
OPERA
TION (2)
W401
P
age 32 A-4
T
O
OPERA
TION (2) CB407
P
age 32 A-2
T
O
OPERA
TION (2) CB401
P
age 32 A-3
T
O
XM CB24
P
age 34 I-3
TO MAIN (4) CB284
Page 33 B-1
TO OPERATION (1) CB801
Page 32 A-7
TO OPERATION (13) CB301
Page 32 K-6
IC351, 504–510: NJM2068MD-TE
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
IC501: NJU7313AM
Analog Function Switch
13 NC 18 NC
2
3
4
5
6
7
8
9
10
11
12
14
30
1
29
28
27
26
25
24
23
22
21
20
19
17
15
CONTROL
LEVEL
SHIFTER
LA
TCH
LEVEL
SHIFTER
LA
TCH
L1
L2
L3
L4
L-COM1
L5
L6
L-COM2
L7
L8
L-COM3
ST
VDD
VEE
R1
R2
R3
R4
R-COM1
R5
R6
R-COM2
R7
R8
R-COM3
DATA
CK
VSS
16
IC451–453: LA7956
Video Switch
DRIVER
VIDEO
OUT
1
A
2
B
3
VIN1
4
GND
5
VIN2
6
VCC
7
VIN3
8
VIN4
9
CONTROL
4-INPUT 1-OUTPUT
VIDEO SWITCH
6 dB
AMP
IC502 : BD3841FS
Function Switch
F-SW1
F-SW1: INPUT FUNCTION 1
F-SW2: INPUT FUNCTION 2
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
DGND
F-SW2
CL DA VEE GND VCC RECA1 RECA2 RECB1 RECB2 RECC1 RECC2 OUT1 OUT2 INI1 INI2
INA1 INA2 INB1 INB2
INC1 INC2 IND1 IND2
INE1 INE2 INF1 INF2
ING1 ING2 INH1 INH2
LOGIC
+ – + – + – + –
IC603 : LC72722PM
RDS Decoder
+
REFERENCE
VOLTAGE
57kHz
bpf
(SCF)
CCB
TEST
PLL
(57kHz)
ANTIALIASING
FILTER
SMOOTHING
FILTER
RAM
(24 BLOCK DATA)
ERROR CORRECTION
(SOFT DECISION)
SYNC/EC
CONTROLLER
SYNC
DETECT-1
DATA
DECODER
CLOCK
RECOVERY
(1187.5Hz)
MEMORY
CONTROL
OSC/DIVIDER
VREF
CLK(4.332MHz)
SYNC
DETECT-2
VDDA
VSSD
VDDD
RDS-ID
SYNC
SYR
VSSA
MPX IN
DO
CL
DI
CE
T1
T2
T3
T4
T5 T6 T7
X IN
VREF FL OUT C IN
X OUT
3 14
15
19
18
24
1 5 6
4
2
20
21
22
23
7
8
9
10
11 16 17 13 12
IC503 : YAC526-EZE2
2 Channel High Grade Digital Volume
IN1
OUT1
TE1
TE2
TE3
ZCEN1
ZCEN2
OUT2
24
22
23
5
6
7
14
15
13
16
3
8
4
9
2
1
12
11
10
21
REF1B
REF1A
REF2A
REF2B
IN2
AVDD
DGND
REF
AVSS
DVSS
SDATAO (Open Drain)
SDATAI
SCLK
CSN
Vol B: 10k
0 ~ -95dB
0 ~ -95dB
0 ~ +31.5dB
16
0 ~ +31.5dB
OP Amp
Zero
Crossing
Detector
Zero
Crossing
Detector
S/P
Register
Control
Register
OP Amp
Vol B: 10k
Vol A: 15k
100
100
Vol A: 15k
Point q (Pin 13 of IC602)