Yamaha RX-V757, Service Manual

Page: 38 / 48

A B C D E F G H
1
2
3
4
5
6
I J K L M N
7
8
9
10
85
RX-V757/DSP-AX757/DSP-AX757SE
RX-V657/HTR-5860
■
SCHEMATIC DIAGRAM (DSP 1/2)
* 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.
A1
B1
A2
V DD
B4
1
2
3
4 11
Y1 A4
Y4
12
13
14
B2
Y2
B3
A3
5
6
7 V SS Y3 8
9
10
1A
1Y
2Y
V
DD
6A
1
2
3
4 11
2A 6Y
5A
12
13
14
3A
3Y
5Y
4A
5
6
7 V SS 4Y 8
9
10
IC3 : SN74AHCT00PWR
Quad 2 Input NAND IC1 : SN74LVU04APWR
Hex Inverters
IC10 : SN74LV245APWR
Octal 3-State Bus Transceivers
1 DIR
2 A1
3 A2
4
A3
5 A4
6 A5
7
A6
8 A7
9 A8
10 GND
20 V
CC
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
19 ENG
IC13 : PQ012FZ01ZP
Rgulator
DC INPUT (VIN) DC OUTPUT (VO)
ON/OFF CONTROL (VC)
GND
2
5
3 1
I C
G 4A 4B 4Y 3A 3B
1A 1B 1Y 2A 2B 2Y
3Y S
15
STROBE
2
1A
14
4A
13
4B
12
4Y
11
3A
10
3B
9
3Y
1
SELECT
3
1B
4
1Y
5
2A
6
2B
7
2Y
8
16
V
CC
GND
INPUTS OUTPUT OUTPUT INPUTS
INPUTS OUTPUT OUTPUT INPUTS
IC7 : SN74LV157APWR
2 to 1 Data Selectors
INPUTS
X
L
H H
L
L L
A
B
SELECT
STROBE
G
OUTPUT
Y
A1
B1
A2
V DD
B4
1
2
3
4 11
Y1 A4
Y4
12
13
14
B2
Y2
B3
A3
5
6
7 V SS Y3 8
9
10
IC22 : SN74AHCT08PWR
Quad 2 Input AND
* 電圧は、内部抵抗10MΩの電圧計で測定したものです。
* Z 印のある部品は、安全性確保部品を示しています。部品の交換が必要な場合、
パーツリストに記載されている部品を使用してください。
* 本回路図は、標準回路図です。改良のため予告なく変更することがございます。
3.5
0 4.9 0.1 4.5 4.9 4.9 0.7 0.7 0
0
3.5 0.1 3.5 3.4 3.5 0.5 0.4
0
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0
0.2
3.4
0
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.4
3.3
3.2
3.3
3.2
3.3
3.2
3.3
3.2
3.4
0
3.4
0.4
3.2
3.3
0
3.3
3.3
3.4
3.3
3.3
0 0
3.3 3.3
3.3
3.4
3.4
1.8
3.4
0.1
0
~
~
2.6
2.9
0
3.4
3.4
0.1
0.1
~
~
2.6
2.9
3.1
3.1
0.4
3.2
3.4 0
3.2
0
3.2
3.2
3.4
3.3
3.3
3.3
3.4
3.4
3.4
3.4
3.4
3.4
0.1
0.1
0.4
0.4
3.1
3.1
3.4
4.4
4.9 4.9 0.1 4.9
04
.9
3.1 3.1
0.1
03
.4
3.4
3.5
3.5 3.5 0.2 0.2 3.5
04
.9
3.5 3.5 3.5
0
4.9
1.9
3.2 1.3 2.9 0
0
1.3
0
0
3.5
3.5 4.8
0.1
3.4
3.4
0.1 4.8
4.8
0
4.8
0.1
0.1
0.2
0
4.8
0.2
0
4.8
0.2
0 4.8 0.1
2.2 1.8 0.6
2.2
4.8
0
2.7 0.6
0
4.8
0.1
0.6
0.6
0.1
0.2
0.2
0.2
0
0
0
3.5
3.5
3.4
3.5
0.1
0
3.5
1.6
1.7
1.8
3.5
0
0.1
0.1
0.1
0.1
0.1 3.5 3.5
4.9 0 3.5
3.4 0.2 0.5 3.1
3.5
0
1.8 0.1
0
3.5
1.8 0.1
1.3 0 3.4
3.4
1.8 0 3.4
1.3 0 0.1 1.3 1.3 0 3.5 3.5 3.5 1.3 0 3.4 3.5 3.5 3.5 3.4
0
0
1.3
3.4
3.4
0 0 3.4
1.3 0 1.3
0.1
3.5
0 3.4
0
3.4
0
0
1.3
1.3
0
3.4 3.4 3.4
0
1.3 0.4 0.4 3.1 3.4
0
1.3 3.1 2.9 2.6
~
3.4
0 ~
3.4
0
1.8
3.4
1.3
0
3.4
3.4
0
0.1 3.4
0
1.3 0.1 0.1 0.1 0.1 0.1 0.2 1.3
0
3.4 0.1 0.1 0.1 3.4 3.4
1.3
0.1
1.3
0
3.4
3.4
3.4
0
1.3
0
1.3
0
0
1.8
1.8
1.3
0
3.4
1.8
0
1.3
0
3.1
3.5
3.4
0
1.3
1.3
0
3.4
3.4
1.3
3.4
0
1.3
3.4
0
0
1.3
1.3
0
0.5
0.2
1.8
0
1.8
1.3
0.1
1.4
1.3
0
1.4
0.8
0.1
0.1
0.1
0
3.4
1.8
1.8
3.4
3.5
0
3.2
1.3
3.2
3.2
3.2
3.3
3.3
0
3.4
1.3
3.3
3.3
3.3
3.3
3.3
1.3
0
3.4
3.3
3.2
3.3
3.4
3.4
3.4
0
1.3
3.3
3.3
1
DECODER
DSP
DIR
4M ROM
16M
SRAM
REGULATOR
BUFFER
SELECTOR
FL/FR
C/SW
SL/SR
PL/PR
SBL/SBR
DIGITAL IN
A/D IN
4
1
35
2
4
1
35
2
X: NOT USED
U, C J, R, T, K, A, B, G, E, L
RX-V757/DSP-AX757/DSP-AX757SE/RX-V657 Page 88 K-2
HTR-5860 Page 89 L-2 TO OPERATION (4) W881
TO OPERATION (5) W881
TO SUBTRANS (2) CB457 RX-V757/DSP-AX757/DSP-AX757SE/RX-V657 Page 92 I-8
TO SUBTRANS (2) CB457
HTR-5860 Page 93 J-8
Point
q
(Pin 28 of IC2)
IC12 : SN74AHC1G08DCKR
Single 2 Input AND
1
2
3
5
4
VDD
OUT X
IN B
VSS
IN A
IC26 : SN74AHCT1G32DCKR
Single 2 Input OR
1
2
3 4
5
Y
A
B
GND
VCC
IC8 : MBM29LV400BC-70PFT
4M Bit Flash Memory
RY/BY
RY/BY
BUFFER
ERASE CIRCUIT
WRITE/ERASE
PULSE TIMER
LOW VCC DETECT
VCC
VSS
WE
BYTE
CE
OE
A-1
A0~A17
RESET
CONTROL
CIRCUIT
(COMMAND REGISTER)
CHIP ENABLE
OUTPUT ENABLE
CIRCUIT
WRITE CIRCUIT
I/O BUFFER
DQ0~DQ15
DATA LATCH
Y DECODER
X DECODER
ADDRESS LA
TCH
STB
STB
Y GATE
4,194,304
CELL
MATRIX
IC6 : W9816G6CH-7
512K x 2 Banks x 16 Bits SDRAM
CLOCK
BUFFER
ADDRESS
BUFFER
CLK 35
18
CKE 34
A10 20
CS
17 RAS
16 CAS
15 WE
21 A0
24 A3
27 A4
32 A9
19 BA
2 DQ0
3 DQ1
5 DQ2
6 DQ3
8 DQ4
9 DQ5
11 DQ6
12 DQ7
39 DQ8
40 DQ9
42 DQ10
43 DQ11
45 DQ12
46 DQ13
48 DQ14
49 DQ15
14 LDQM
36 UDQM
COMMAND
DECODER
REFRESH
COUNTER
REFRESH
COUNTER DQ
BUFFER
COLUMN
COUNTER
MODE
REGISTER
CONTROL
SIGNAL
GENERATOR
CELL ARRAY
BANK #0
R
O
W
D
E
C
O
D
E
R
COLUMN DECODER
SENSE AMPLIFIER
CELL ARRAY
BANK #1
R
O
W
D
E
C
O
D
E
R
COLUMN DECODER
SENSE AMPLIFIER