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Schematic Diagram - Yamaha MDX-E300 Service Manual

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B
MDX-E300
I

SCHEMATIC DIAGRAM

1
2
P-63
[K-7]
4.9
0
4.9
0
4.9
1.9
1.9
~
~
~
~
0
3.2
~
4.9
3
3.6
3.6
1.6
0
5.0
0
DIGITAL INPUT
4
5.0
0
4.0
5.0
0
4.0
5
0
0
0
0
0
0
0
0
0
MAIN CPU
0
0
0
0
0
0
0
0
6
0
5.0
0
0
0
0
0
0
0
0
0
0
0
7
8
64
C
D
E
LPF
6.0
0
0
0
0
0
0
-6.0
BUFFER
6.0
0
0
0
0
0
0
-6.0
SELECTOR
0
0
0
q
4.9
4.9
0
0
0
0
0
4.9
2.4
0
2.1
5.0
RESET
5.0
~
4.2
4.4
0
0
0
0
0
EEP
0
0
ROM
0
0
4.9
4.9
* All voltages are measured with a 10MΩ/DC electric 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.
F
G
MAIN (1)
MUTING
0
-5.9
0
-5.9
0
0
0
0
-5.9
-5.9
0
0
BUFFER
6.0
0
0
0
0
0
0
-6.0
MUTE CONTROL
4.4
4.9
4.4
POWER
-6.0
SUPPLY
4.9
4.4
0
-13.3
-6.0
-13.2
-13.3
-12.6
11.3
10.7
w
6.0
11.2
6.2
4.9
6.2
0
0
5.4
10.9
0
0
0
5.0
11.3
10.6
1.2
10.6
0
0
-29.6
-24.2
-28.9
-35.4
-24.2
-13.4
-35.4
-28.9
● 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。
H
I
CIRCUIT CHANGES BY MARKET.
X : NOT USED
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
FL DRIVER
-26.7
-26.7
-26.7
-26.7
-26.7
4.9
~
~
~
MAIN (2)
MAIN (3)
AC21.3
AC4.2
MAIN (4)
GND
ON/OFF
J
K
L
IC3 ~ 5 : NJM2068D-D
Dual OP-Amp
OUT
1
1
8
+V
CC
–IN
2
7
OUT
1
2
+
+
+IN
3
6
–IN
1
2
–V
CC
4
5
+IN
2
IC1 : TC74HCT04AP
Hex Inverters
1A
1
14
V
DD
1Y
2
13
6A
2A
3
12
6Y
2Y
4
11
5A
3A
5
10
5Y
3Y
6
9
4A
V
7
8
4Y
SS
IC2 : TC74VHC157F
2 to 1 Data Selectors
INPUTS
OUTPUT
INPUTS
OUTPUT
V
CC
STROBE
4A
4B
4Y
3A
3B
3Y
16
15
14
13
12
11
10
9
G
4A
4B
4Y
3A
3B
S
3Y
1A
1B
1Y
2A
2B
2Y
1
2
3
4
5
6
7
8
SELECT
1A
1B
1Y
2A
2B
2Y
GND
INPUTS
OUTPUT
INPUTS
OUTPUT
FUNCTION TABLE
INPUTS
OUTPUT
SELECT STROBE
Y
G
X
H
L
L
L
A
H
L
B
IC7 : S-24C01ADP
Electrically Erasable PROM
TEST
7
8
V
CC
4
GND
SCL
6
START / STOP
LOGIC
SERIAL
SDA
5
CLOCK
CONTROL
H.V.GENERATOR
LOAD
DEVICE
COMP
ADDRESS
COMPARATOR
DATA
LOAD
INC
REGISTER
A2
3
R/W
ADDRESS
COUNTER
E
2
PROM
~
A1
2
~
A0
1
~
Y DECODER
SELECTOR
~
DATA OUT
~
ACK OUT
D
IN
CONTROL
~
D
OUT
~
-28.9
~
~
~
~
~
~
Point q
(Pin 13 of IC6)
~
~
H : 20 µsec/div
V : 2V/div
DC range
1 : 1 probe
0V
Point w
CH1 : Emitter of Q2
V : 2V/div CH1
V : 2V/div CH2
CH2 : Collector of Q14
H : 5 sec/div
DC range
1 : 1 probe
CH 1
CH 2
AC CORD
AC CORD
ON
OFF
IC8 : M5290P
Constant-Voltage Tracking Supply with Reset
OUTPUT
VCC
E– C+
NC
(+5V)
DELAY
16
15
14
13
12
7
REFERENCE
11
IN
8
RESET OUT
REFERENCE
CURRENT
PROTECTION
REGULATOR
CONTROL
9
ON/OFF
CONTROL
10
+
6
BAL. ADJ.
CURRENT
CURRENT
CONTROL
CONTROL
1
3
2
4
5
–VCC
E–
C–
NC
OUTPUT
(–5V)

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