Yamaha RX-V1500 Service Manual page 85

A B C
SCHEMATIC DIAGRAM (CONVERSION)
1
Page 84
to VIDEO (2)
2
3
SELECTOR
0.1 5.3 0
0.1 -4.9
0.1
0.1 0.1 0.1
0.1 0.1 -4.9
0.1 0.1 0
0.1 -4.9
0
4.9 0.1
0 0.1 5.3
4
R919
220
5
SELECTOR
0 5.7
0.1 0
6
0.1 0
0.1 0.1
0.1 0
0 0.1
-4.9 0.1
0 0.1
7
SELECTOR
8 0 5.7
0.1 0
0.1 0.1
0.1
0.1
0.1
0
0.1
0
0 0.1
0 0.1
J model only
9
Point 5 Pin 3 of IC808 Point 6 Pin 12 of IC808
10
D E F
F4
5.3 5.3
5.3
2.8 2.8 2.8 2.8 2.7
3.3K 560P
5.3
0
5.3
0
5.3
0 0 0
0.1 0.1 0
0.1
0
0
0
0
5.1
2.4 2.4
5.2
1.9
0
3.3
3.3
2.4
0
0
0
5.1
5.2
1.8
0
2.6
5.1
5.1
5.5
0
5.5
5.2
2.4
11.7 9.2
9.8
9.8
0
1.3
0.6
0.1
5.2
-2.7
-3.3
Page 84 H9
to VIDEO (8)
IC801~803: TC74HC4052AF
Analog Multiplexer/Demultiplexer
INH VCC
6 16
INHIBIT B A
0 0 0 0x, 0y
A 10 LEVEL BINARY TO 1-OF-4
CONVERTER DECODER WITH INHIBIT 0 0 1 1x, 1y
B 9
0 1 0 2x, 2y
GND 8
0 1 1 3x, 3y
VEE 7
1 X X NONE
0X 12 SW
1X 14 SW
13 X-COM
2X 15 SW
3X 11 SW
0Y SW
1
1Y
5 SW
Y-COM
3
2Y 2 SW
3Y 4 SW PowerSave
G H
5.3
2.8 2.8 2.8 2.8 2.7
3.3K 560P
0 0
0.1 0.1 0
0.1
0
0
0
5.1
0
0
0
0
0
5.1
-4.9
5.1
5.1 0
4.5
3.6
5.1
1.3 1.3
4.5
1.3
3.6
1.3 0.7
2.1 -4.9
5.1
3
1
-0.3
2
-0.1
-0.3
5.2
4.5
3.6
5.2
4.5
5
1.3
1.3 0.7
7 0
0 6
2.1 -4.9
0
-4.9
3.6
-3.3
-3.3
IC804: NJM2581M IC805, 811: SN74LVU04APWR IC806: TC90A49F
Video Amp Hex Inverters 3 Line Digital Y/C Separator
1A 1 14 VCC
1Y 2 13 6A
6dB 75Ω
VIN1 1 14 V+1
AMP Driver
2A 3 12 6Y
BIAS
NEE1 2 13 VOUT1
2Y 4 11 5A
AIN 5 ADC
3A 5 10 5Y
6dB 75Ω
VIN2 3 12 V+2
AMP Driver
3Y 6 9 4A
CLAMP C-BPF
BIAS
VEE2 4 11 VOUT2
GND 7 8 4Y
4 fsc
6dB 75Ω
VIN3 5 10 V+3
AMP Driver
1/2
BIAS
VEE3 6 9 VOUT3
7 REF 8 GND
I J K
5.1 0
2.5 0
5.1 4.5
5.1 4.5
0
1.6 9.1
0.1 9.1
COMPONENT
0.8
5 CONVERSION 6
2.4 0
2.4 1.2
IC810: TK15420M
Video Amp
OUT A 1
–IN A 2
+ –
+IN A 3
VEE 4
IC809: TC74HC4053AF
Analog Multiplexer/Demultiplexer
INHIBIT
6
A 11
B 10
CONVERTER
C
9
VSS 8
VEE 7
0X 12
1X 13
0Y 2
1Y
1
0Z
5
1Z 3
IC808: TA1270BF
Sync Processing System
DAC2 Y OUT
38
Y OFFSET
DAC2
DAC1 39
DAC1
Y IN 40
CONVERSION
PEDESTAL
CLAMP
DAC Vcc 41
(5V)
Y DL
C Vcc 42
(5V)
43
UV/CbCr SW
fsc OUT 44 fsc
ANALOG
THROUGH MODE
1H DL
VERTICAL EDGE 1HDL CONT 45
COLOR
ENHANCEMENT CIRCUIT CONTROL
SECAM
24 Y OUT SECAM CONT 46
LINE LINE +
Y-LPF Y DAC CONTROL
MEMORY MEMORY
–
B-Y/Cb OUT 47
C-BPF C-BPF KILLER
CbCr / UV
SW
20
C OUT
R-Y/Cr OUT 48
DYNAMIC COMB FILTER C-BPF Trap C-LPF C DAC
8 fsc
1
I 2 C BUS
PLL
4.43MHz M-X'tal
X'tal
15 17 11 12 13 14
CKIN FIL SDA SCL TEST KILLER
L M N
RX-V1500/DSP-AX1500
# All voltages are measured with a 10MΩ/V DC electronic 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.
8 VCC
7 OUT B
+ –
6 –IN B
5 +IN B
VDD
16
INPUT STATES
"ON" CHANNNEL (S)
LEVEL BINARY TO 1-OF-8
INHIBIT C B A
DECODER WITH INHIBIT
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
SW
14 X-COM 0 1 0 0 0X, 0Y, 1Z
SW
0 1 0 1 1X, 0Y, 1Z
SW
0 1 1 0 0X, 1Y, 1Z
Y-COM
15
SW 0 1 1 1 1X, 1Y, 1Z
1 X X X NONE
SW
Z-COM
4
SW
I 2 C GND
GND DAC TEST SDA SCL Ys R-Y1 IN B-Y1 IN Y1 IN R-Y2 IN B-Y2 IN Y2 IN
37 36 35 34 33 32 31 30 29 28 27 26 25
DAC PEDESTAL PEDESTAL
I2C BUS Ys
SW TEST CLAMP CLAMP
CONTROL
24 SW GND
OFFSET
SW
SUB.
Y DL
CONTRAST HI : 2ch/LOW : 24h
23 ADRS SW
SW
22 R-V/R OUT
fsc
TRAP
SW 21 B-Y/B OUT
YUV → RGB
SW
MATRIX
20
SYSTEM Y/G OUT
CW
TINT
MATRIX
19 SW Vcc
(9V)
DEMO
18 SYNC Vcc
P/N ID
(9V)
CHROMA
LPF / fsc BLK NOSE CP/HP
17 CP/HP IN
IN
TRAP DET
SW
16 Dig GND
BPF TOF V
H. AFC H C/D V C/D
SEP
APC
SCP 15 SCP OUT
SYNC
SEP
VCX0
ACC
SUB 32fH
COLOR VCO
2 3 4 5 6 7 8 9 10 11 12 13 14
3.58MHz APC C GND C IN V-SEP SYNC SYNC H. AFC SYNC 32fH VD OUT HD OUT
X'tal IN OUT GND VCO
85