Yamaha RX-V740 Service Manual page 85

A B
SCHEMATIC DIAGRAM (FUNCTION 2/2)
1
2
3
x: NOT USED
O: USED / APPLICABLE
Page 90 D1
to VIDEO
4
5.0 11.7
11.7
5.6
2.9
2.3
0.6
0
5
4.9 4.9
13.2 4.9
4.9
0.6 5
0.6
4.7
0
13.2 13.1
A
B
6 12.5
4.7
0
7.5 7.0
0
7.5 0
0
0
7
4.9
4.9
Page 88 G8
to OPERATION (1)
8
# All voltages are measured with a 10MΩ/V DC electric volt meter.
# 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.
9
C D E
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640
Page 84 E2 Page 84 F2
to FUNCTION (1) to FUNCTION (1)
4.9
-11.9 4.9
4.9
4.9
-11.9
3
4.9
-11.9
4.9
4.9
4.9
-11.9
4.9
0
-11.9 4.9
0
0
4.9
4.9
4.9 4.9
4.8 4.2
4.9 4.9
0 MICRO COMPUTER 4.9
0
4.9
0 4.9
0 4.9
4.9 0
4.9 0.9
0.7 4.9
0
1.0
0 0
4.9
4.8
4.9 4.9
0 0.1
1.9 0
4.9 4 0
4.9
0.2
4.9 0
0 1.9
0 0
Page 81 E1
to DSP
Point 3 Pin 12 of IC603 Point 4 Pin 13 of IC601
F G H
INPUT
SELECTOR
4.9
0
-4.9
-4.9
3 0
0 13
5 0
11
4.9
6 0
12
8 0
10
4.9
0
1
0 15
0
2
4.9
4.9
0 3
8
1 0 0
0 2
0 0
4.9
C-INPUT 0 4.4
-4.8 4.4
SELECTOR 0 4.9
0
0 6
7 0 0 0
0 5
4
-4.8
0
0 0
VIDEO DRIVER
0 4.8
0 0
0 0
0 0
0 4.8
-4.8
0
0
-4.8
-4.8 -4.8
-4.8 -4.8
0 4.8
0 0.1
0 0
0 0.1
0 4.8
-4.8
0
0 -4.8
Y-INPUT SELECTOR
Y/C MIX
4.9
4.9
4.9
0 4.9 4.9 4.9
8 0
5
0 0 0
0.9 0 7
6 0 1.0 1.3
0
-0.6
0.2
0 -0.6 1.0 1.0
1.0
1.0
0 0
2 1.7
1.0 1 0.5
3
0.9 1.0
3 0.5
1.0 -4.8
Point 5 Emitter of Q601 and collector of Q602
A Q601 E
B Q602 C
POWER ON POWER OFF
(Connect the power cord) (Disconnect the power cord)
I J
RX-V740/RX-V740RDS/DSP-AX740
RX-V640/RX-V640RDS/HTR-5660/DSP-AX640/DSP-AX640SE
IC602: NJM78L05A-T3
Voltage Regulator
0
0.6
0
5.0
4.9
-4.9 0
4.9
IC603: LC72722
-4.9 4.9
RDS Decoder
0 4.9
0 1
0
VDDA
0 3
REFERENCE
VOLTAGE
VSSA 4
57kHz
Y SELECTOR MPX IN 2 ANTIALIASING SMOOTHING
FILTER bpf
(SCF)
DO 20
4.9 CL 21
RAM
0
DI 22 CCB (24 BLOCK DATA)
PS GND
CE 23
-4.9 VEE3 VOUT3 0
0 5.0 T1 7
0 VIN3 V+3 MEMORY
CONTROL
0 -4.9 0 T2 8 TEST
0 VEE2 VOUT2
T3 9
0 VIN2 V+2 5.0
-4.9 0 T4 10
VEE1 VOUT1
0 VIN1 V+1 5.0
11 16 17
Cb SELECTOR
IC701, 702, 801: TC74HC4051AFEL
0 Analog Multiplexer/Demultiplexer
0 0
INHIBIT VCC
6 16
A 11
LEVEL
B 10
Cr SELECTOR CONVERTER
C 9
GND 8
VEE 7
0 13
1 14
2 15
3 12
4 1
5 5
6 2
7 4
INPUT STATES
"ON" CHANNNEL
INHIBIT C B A
Note: IC821 LA7104M for P.W.B. A to D version.
NJM2581M for P.W.B. E or later version. 0 0 0 0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1
0 1 1 0
0 1 1 1
1 X X X
IC703: LA7109
75Ω Video Driver
VIN1+
1
NFB1 2 6dB
3
MUTE1
VIN2+
4
6dB
4.9
NFB2 5
2.6 2.6 2.6
2.6
0.1
0 -VCC1 6
VIN3+ 7 6dB
0
NFB3 8
N.C. 9
4.9 4.9
0 0 0 4.4
10
0 N.C.
0
11 11
VIN4+
0
4.9 NFB4 12 6dB
0
13
S-SIGNAL DETECTOR MUTE2
VIN5+ 14
6dB
NFB5 15
-VCC2 16
VIN6+ 17
6dB
4.9
NFB6 18
4.2
4.2
0.9
4.2 0
-0.1
0 -0.4 -0.3
IC705, 706: TK15420M
-1.8
Video Amp
0
0
OUT A 1 8 VCC
–IN A 2 7 OUT B
+ – + –
+IN A 3 6 –IN B
VEE 4 5 +IN B
IC707, 709, 822: TC74HC4053AF
Analog Multiplexer/Demultiplexer
INHIBIT VDD
6 16
A 11
LEVEL
B 10
CONVERTER
C
9
VSS 8
VEE 7
0X 12
1X
13
0Y 2
1Y 1
0Z
5
1Z 3
INPUT STATES
"ON" CHANNNEL (S)
INHIBIT C B A
0 0 0 0 0X, 0Y, 0Z
0 0 0 1 1X, 0Y, 0Z
0 0 1 0 0X, 1Y, 0Z
0 0 1 1 1X, 1Y, 0Z
0 1 0 0 0X, 0Y, 1Z
0 1 0 1 1X, 0Y, 1Z
0 1 1 0 0X, 1Y, 1Z
0 1 1 1 1X, 1Y, 1Z
1 X X X
IC821: LA7104M IC802: LA7108M IC708: TC74HCU04AF
Video Amp Video Amp Hex Inverters
1A 1 14 VCC
VIN1+ 1 16 +VCC VIN1+ 1 +VCC
16
1Y 2 13 6A
NFB1 2 6dB DR 15 VOUT1
NFB1 2 6dB DR 15 VOUT1
2A 3 12 6Y
3
MUTE1 14 GND
2Y 4 11 5A
MUTE1 3 14 GND
VIN2+ VOUT2
4 13 3A 5 10 5Y
VIN2+ VOUT2
6dB DR 4 13
3Y 6 9 4A
NFB2 5 12 DR CTL 6dB DR
NFB2 5 12 MUTE2
GND 7 8 4Y
-VCC1 6 11 VOUT3
6
-VCC1 11 VOUT3
VIN3+ 7 6dB DR 10 MUTE2
VIN3+ 7 6dB DR 10 MUTE3
NFB3 8 9 -VCC2
NFB3 8 9 -VCC2
K L
INPUT
OUTPUT
GND
5 6
CLOCK
+ PLL 14 VDDD
RECOVERY
(57kHz)
(1187.5Hz)
15 VSSD
VREF
DATA
FILTER DECODER 19 RDS-ID
SYNC
ERROR CORRECTION SYNC/EC 18
(SOFT DECISION) CONTROLLER 24 SYR
CLK(4.332MHz)
SYNC SYNC
DETECT-1 DETECT-2
OSC/DIVIDER
13 12
BINARY TO 1-OF-8
DECODER WITH INHIBIT
SW 3 COM
SW
SW
SW
SW
SW
SW
SW
0
1
2
3
4
5
6
7
NONE
+VCC1
36
DR 35 VOUT1
34 GND
VOUT2
33
DR
32 DR CTL2
31 VOUT3
DR 30 MUTE4
29 -VCC4
28 N.C.
27 N.C.
26 26 +VCC2
DR 25 VOUT4
24 GND
23 VOUT5
DR
22 DR CTL1
21 VOUT6
MUTE3
DR 20
19 -VCC3
BINARY TO 1-OF-8
DECODER WITH INHIBIT
SW
X-COM
14
SW
SW
15 Y-COM
SW
SW
4 Z-COM
SW
NONE
85