Yamaha RX-497 Service Manual page 29

A B
SCHEMATIC DIAGRAM (FUNCTION)
1
3.9
2
6.1
6.1
6.1
5.5 6.7
7.2
0
0
3
Page 32 I-5
TO XM CB23
4
5
6
0 0
7
0.7 0.7
0 0
0 0
0.7 0.7
0 0
8
C D E
0.1
6.1
0
3.8
0.1
3.9
0
3.9
11.8
3.9
11.9
14.2
0
0.1
12.4
14.1
14.1
0 0
12.4
0
0
0
0
13.9
13.9
0
0
0
0 0
0
18K 0 0
13K
0
0
0
0
0
0
0 0
0
0
13K 18K
0
-13.6
0 -13.6
0
0
0 0
0 0
0 0
0 0
0 -7.2
0
0
0 7.2
0
0
0
0
0 0
0 0
0 0
0 0
0 0
0 0
0
0
14.7
0 -14.5
0
7.3
14.7
7.9
7.9
0
0
-7.9
-7.9
-7.4
-14.4
F G H
Page 30
Page 31 C-2 Page 30 A-7
TO OPERATION (13) CB301
TO MAIN (1) W103 TO OPERATION (1) CB801
5.6
4.9 4.9 4.9
9.8 5.6
5.2 11.9
0
11.9 14.7
4.2
5.6 4.9
5.5 12.4
4.8
0.1 4.8
5.6
0.1
4.8
5.5 12.4
0 0
0
4.8
4.8
4.9
4.9
1.6
3.0
1.7
0.9
4.9
4.9
0
1.1
4.9
4.8
4.8
4.9
-14.2 4.8
4.9
4.2
1
4.9
4.8
-14.2
I J
VIDEO
L1
L2
L3
L4
L-COM1
L5
L6
L-COM2
L7
L8
L-COM3
ST
VDD
VEE
NC
J-6
IC502 : BD3841FS
Function Switch
32 31 30 29 28 27
LOGIC
F-SW1: INPUT FUNCTION 1
F-SW2: INPUT FUNCTION 2
1 2 3 4 5 6
4.8
0
0
0
4.8
0
0.5
0
IC603 : LC72722PM
0
RDS Decoder
0
0
0
0 1
0
VDDA 3
0
REFERENCE
0
VOLTAGE
0 VSSA 4
4.8
57kHz
0 ANTIALIASING SMOOTHING
MPX IN 2 bpf
FILTER
(SCF)
DO 20
CL 21
RAM
DI 22 CCB (24 BLOCK DATA)
CE 23
T1
7 MEMORY
T2 CONTROL
8 TEST
T3
9
T4 10
11 16 17
Point q (Pin 13 of IC602)
* 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.
K
RX-497
IC451: LA7956
Video Switch
6 dB
AMP
4-INPUT 1-OUTPUT
CONTROL
VIDEO SWITCH
DRIVER
1 2 3 4 5 6 7 8 9
A B VIN1 GND VIN2 VCC VIN3 VIN4
OUT
IC501: NJU7313AM
Analog Function Switch
2 29 R1
3 28 R2
4 27 R3
5 26 R4
6 25 R-COM1
7 24 R5
8 23 R6
9 22 R-COM2
10 21 R7
11 20 R8
12 19 R-COM3
14 17 DATA
CONTROL
30 CK
16
1 15 VSS
13 18 NC
26 25 24 23 22 21 20 19 18 17
7 8 9 10 11 12 13 14 15 16
IC504, 510: NJM2068MD-TE
Dual OP-Amp
OUT 1 +V
1 8 CC
–IN 1 2 7 OUT 2
+ – + –
+IN 3 6 –IN
1 2
–V CC 4 5 +IN 2
5 6
CLOCK 14 VDDD
+ PLL
RECOVERY
(57kHz)
(1187.5Hz)
15 VSSD
VREF
DATA
19 RDS-ID
DECODER
FILTER
18 SYNC
ERROR CORRECTION SYNC/EC
(SOFT DECISION) CONTROLLER
24 SYR
CLK(4.332MHz)
SYNC SYNC
DETECT-1 DETECT-2
OSC/DIVIDER
13 12
29