A
B
C
D
E
F
G
H
1
2
3
4
5
6
I
J
K
L
7
8
MDX-E300
64
* All voltages are measured with a 10M
Ω
/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.
■
SCHEMATIC DIAGRAM
MAIN CPU
LPF
MUTING
BUFFER
BUFFER
MUTE CONTROL
RESET
POWER
SUPPLY
EEP
ROM
DIGITAL INPUT
SELECTOR
FL DRIVER
CIRCUIT CHANGES BY MARKET.
X : NOT USED
0
0
0
q
w
AC21.3
AC4.2
0
0
0
0
0
0
0
0
4.9
5.0
5.0
0
0
0
0
6.0
-6.0
0
0
0
0
6.0
0
0
-6.0
0
0
0
-5.9
0
0
0
0
-5.9
0
-5.9
0
0
-5.9
0
4.4
4.4
4.9
-6.0
4.9
0
-6.0
-13.3
-13.3
-12.6
4.9
1.3
-6.0
0
-12.6
0
-13.2
0
1.2
6.0
0
10.7
0
11.2
10.9
11.2
10.7
6.0
11.3
6.2
0
0
0
6.2
0
0
4.9
11.3
5.4
5.0
10.6
10.6
-13.4
-24.2
-35.4
-35.4
-29.6
0
-28.9
-28.9
0
4.9
4.9
0
0
0
0
0
4.9
2.4
0
2.1
5.0
5.0
~
4.2
4.4
0
0
0
0
0
0
0
0
4.9
4.9
4.9
0
5.0
0
0.2
0.6
4.8
4.9
0.1
~
4.5
0
0
0
0
4.9
0
0
0
0
0
5.0
5.0
4.9
0
0
0
0
0
0
0
0
0
0
0
5.0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
~
4.9
0.1
4.0
0
0
0
0
0
5.0
4.0
0
4.9
3.6
3.6
0
3.2
1.9
~
~
~
~
~
4.9
4.9
0
0
6.0
0
0
0
-6.0
0
0
0
1.9
0
4.9
~
~
5.0
4.0
0
5.0
1.6
0
0
0
0
0
0
0
0
0
-24.2
0
1.2
-13.2
4.4
0
0
0
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-28.9
0
0
2.4
2.4
4.9
4.9
0
0
0.2
4.4
4.4
0
~
~
~
~
~
~
~
~
-26.7
-26.7
-26.7
~
~
~
~
~
~
~
~
~
~
~
~
~
~
-22.9
-22.9
-22.9
-22.9
~
~
~
~
~
~
~
~
~
~
~
~
-26.7
~
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-26.7
-22.9
-22.9
-22.9
-22.9
-26.7
-26.7
4.9
MAIN (3)
MAIN (4)
MAIN (2)
MAIN (1)
P-63
[K-7]
IC1 : TC74HCT04AP
Hex Inverters
IC3 ~ 5 : NJM2068D-D
Dual OP-Amp
–
+
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4
5
+IN
1
–IN
2
+IN
2
–
+
6
7
8
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
IC2 : TC74VHC157F
2 to 1 Data Selectors
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
VCC
GND
INPUTS
OUTPUT
OUTPUT
INPUTS
INPUTS
OUTPUT
OUTPUT
INPUTS
INPUTS
X
L
H
H
L
L
L
A
B
SELECT
STROBE
G
OUTPUT
Y
FUNCTION TABLE
VCC
E– C+
NC
OUTPUT
(+5V)
DELAY
RESET OUT
BAL. ADJ.
GND
ON/OFF
E–
C–
NC
–VCC
DELA
Y
CIRCUIT
REFERENCE
REGULATOR
PROTECTION
ON/OFF
CONTROL
REFERENCE
IN
+
+
CURRENT
CONTROL
CURRENT
CONTROL
16
15
12
7
9
10
3
2
4
6
11
8
1
14
13
5
OUTPUT
(–5V)
CURRENT
CONTROL
IC8 : M5290P
Constant-Voltage Tracking Supply with Reset
START / STOP
LOGIC
ADDRESS
COUNTER
LOAD
LOAD
COMP
R/W
DOUT
DIN
INC
Y DECODER
DEVICE
ADDRESS
COMPARATOR
DATA
REGISTER
SELECTOR
E2PROM
X
DECODER
DATA OUT
ACK OUT
CONTROL
6
7
5
4
3
2
1
SCL
TEST
SDA
VCC
GND
A2
A1
A0
SERIAL
CLOCK
CONTROL
8
H.V.GENERATOR
IC7 : S-24C01ADP
Electrically Erasable PROM
Point
q
(Pin 13 of IC6)
V : 2V/div
H : 20
µ
sec/div
DC range
1 : 1 probe
Point
w
CH1 : Emitter of Q2
CH2 : Collector of Q14
V : 2V/div CH1
V : 2V/div CH2
H : 5 sec/div
DC range
1 : 1 probe
0V
CH 2
CH 1
AC CORD
ON
AC CORD
OFF
● 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。