Yamaha RX-V461 Service Manual page 45

A B C
RX-V461/HTR-6040/DSP-AX461
DSP 4/6
1
to DSP 2/6
2
3
DSP 5/6
4
5
6
to DSP 5/6
7
Page 75 F10
to OPERATION (1)_CB202
8
CB408
to DSP 1/6
9
to DSP 5/6
10
# All voltages are measured with a 10MΩ/V DC electronic voltmeter.
# 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.
72
D E F
2.6
A/D SELECTOR
0
1.7
1.7
3.3
2.4
3.3
2.6
3.3
3.3
3.3
3.3
3.3
0
0.8
0
0
0
1.7 0
1.5
1.7 0
3.3 0
0
3.3 0.8
0.8 3.3
1.5 1.7
0 0
0.4
3.3
0.1
BUS SWITCH
4.9
0
0.1 3.3
0 5.2
0
0
4.9
0
4.9
3.3
0
3.3
4.9
0
0
3.3
G H
to DSP 3/6
0
0
0
0.2
0.2
0.8
*
0
to DSP 6/6
A/D SELECTOR
* Destination for A/D port
R416 [ohm]
4ch ADC R410 [ohm]
DEST2 (2 pin) [V]
A/D value (3.3 V=255)
Destination
3.3
IC401
3.3
3.3
0.1
0 3.3
0.8 3.3
1.7 3.3
to DSP 2/6
to DSP 2/6
0
I J K
1.5 k 5.6 k 1.0 k 6.8 k 100 k 3.3 k
3.3 k 22 k 8.2 k 3.3 k (open) 4.7 k
2.1-2.4 2.5-2.8 2.8-3.1 1.0-1.3 3.1-3.3 1.8-2.1
164-189 190-215 216-239 70-99 240-255 133-163
J U, C R K A L
IC402, 403: SN74LV4051APWR
8-channel analog multiplxers/demultiplexers
to DSP 6/6 13
14
11
A
15
12
10
B
9
C
to DSP 1/6, 2/6
6
INH
INPUTS ON
Y4 1 16 V
CC CHANNEL
INH C B A
Y6 2 15
Y2
L L L L Y0
COM 3
14 Y1
L L L H Y1
Y7 4 13
Y0
L L H L Y2
Y5 5 12
Y3
L L H H Y3
INH 6 11 A
L H L L Y4
GND 7 10 B
L H L H Y5
8 9
GND C
L H H L Y6
L H H H Y7
H X X X None
L M N
to DSP 5/6
IC401: ADC084S021 CIMM
4-channel, 200 ksps, 8-bit A/D converter
IN1
IN2 8-Bit V A
CS 1 10 SCLK
SUCCESSIVE
MUX T/H
IN3 APPROXIMATION DOUT
V A 2 9
GND
ADC ADC084S021
GND 3 8 DIN
GND
IN4
IN4 4 7 IN1
IN3 5 6 IN2
SCLK
CONTROL CS
LOGIC DIN
DOUT
3
COM
Y0
Y1
Y2
Y3
IC404: SN74AHCT245PWR
1
Y4 Octal bus transceivers with 3-state outputs
5
Y5
2
1
Y6 DIR 1 20 V
DIR CC
4 A1 2 19 OE
Y7
19
OE
A2 B1
3 18
A3 4 17 B2
2
A1
A4 5 16 B3
A5 6 15 B4
18
B1
A6 7 14 B5
A7 8 13 B6
9 12
A8 B7
To Seven Other Channels
GND 10 11 B8