Yamaha MCX-1000 Service Manual page 69

A B
SCHEMATIC DIAGRAM (MAIN: Sub CPU Block)
1
IC606 IC607
2.5 4.9 0
1 14 1
2.4 2 13 4.9 4.9 2
2.5 3 12 0.1 4.9 3
2.4 4.8 3.3
4 11 4
2.4 5 10 4.7 3.3 5
4.7 6 9 4.9 0 6
0 0.2 0
7 8 7
POWER SUPPLY
2.1
2
0 6.4
0
6.4
12.2
7.0
13.0
12.9
IC604: PQ3RD13
Voltage Regulator
0 0
Vin 1 2 Vo
0
4 Vc
3 3
GND
0 4.8
IC606, 613: 74VHC00MTCX
Quad 2-Input NAND Gate
A0 1 14 Vcc
B0 2 13 A2
O0 3 12 B2
A1 4 11 O2
13.0
B1 5 10 A3
O1 6 9 B3 0 0.7
0.7
GND 7 8 O3
4
5.7
5.7
5.9
IC611, 612: SN74LVC1G17DCKR
Single Schmitt-Trigger Buffer
4.9
4.9
NC 1 5 VCC
A 2
GND 3 4 Y
5
5.2
5.2
3.3 3.3 VOLTAGE
0
REGULATOR
2.1
2.1
0.1
0
6
IC602: µPD78F0034BGB-8EU
8-bit Microcomputer
TI00/TO0/P70
16-bit timer/
Port 0 P00 to P03
event counter
TI01/P71
8-bit timer/
Port 1 P10 to P17
TI50/TO50/P72
event counter 50
8-bit timer/
TI51/TO51/P73 Port 2 P20 to P25
event counter 51
Watchdog timer
Port 3 P30 to P36
7
Watch timer
78K/0 Flash
Port 4 P40 to P47
CPU memory
core (32 KB)
SI30/P20
Serial
SO30/P21
Interface 30 Port 5 P50 to P57
SCK30/P22
SI31/P34 Port 6 P64 to P67
Serial
SO31/P35
Interface 31
SCK31/P36
Port 7 P70 to P75
RAM
RxD0/P23 (1,024
bytes)
TxD0/P24 UART0 AD0/P40 to
AD7/P47
ASCK0/P25
A8/P50 to
A15/P57
ANI0/P10 to
External access
ANI7/P17 RD/P64
AV
DD A/D converter WR/P65
AVss
WAIT/P66
AV
REF ASTB/P67
8
INTP0/P00 to
Interrupt control RESET
INTP3/P03
X1
BUZ/P75 System control
Buzzer output X2
XT1
Clock output
PCL/P74
control V V V V V XT2
DD0 DD1 SS0 SS1 PP
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.
9 Schematic diagram is subject to change without notice.
C D E
IC609
4.9 4.9 4.9
14 1 14 IC610
13 0 4.9 2 13 4.9
0 1 5 0
12 0 0 3 12 4.9
3.3
2
0 4.9 4.8
11 4 11
0 3 4 4.9
10 0 4.9 5 10 4.9
9 4.9 4.9 6 9 4.4
4.9 0 4.9
8 7 8
3
IC611 IC613
0 3.3 0 4.9
1 5 1 14
3.3 2 4.9 2 13 4.9
0 3 4 3.3 4.9 3 12 4.9
4.9 0
4 11
4.9 5 10 4.9
IC612
0 6 9 4.9
0 1 5 4.9
0 0
7 8
4.8 2
0 0
3 4
IC614
0 1 14 4.9
8
A
4.9 0
2 13
4.9 3 12 0
3.3 3.3
0 4 11 0 0
0 4.9
5 10
4.9 6 9 0
0 7 8 4.9
VOLTAGE
0.1
REGULATOR
0.1
0
SYSTEM
RESET
3.3 3.3
3.3
0
1.7
0
3.3
0
IC603 : M62703ML
System Reset
V
CC
1
R
3 OUTPUT
–
+
R
1.25V
2
GND
IC614: SN74LV132APWR
Quad 3-Input Positive NAND Gates
1A 1 14 Vcc
1B 2 13 4B
1Y 3 12 4A
2A 4 11 4Y
2B 5 10 3B
2Y 6 9 3A
GND 7 8 3Y
F G
4.9
0.1
0.1
0.1
2
0
10
12 5.0
0
0
0.8
0
4.9
7
0
0
0
4.9
2.5 4.9
6 7 8
B
4.9 4.9
0 1.8
0 1.9
SUB CPU
4.9
0
4.9 4.9
0 0
0.1
4.9
0 0
0 0
0 0
0 5.0
4.4
0
4.2 0
0 0
&1
0 4.9
0 0
0 4.9
4.3
0
EEP ROM
0 0
22.3 0
0.1
0.1
0
0
0.1
0
0.7
0
0
Mark Reference Parts Number Parts Name
&1 IC605 AT24C04N-10SI-2.7
24LC04BT-1/SN
H I
IC609: SN74LV08APWR
Quad 2-Input AND Gate
1A 1 14 Vcc
1B 2 13 4B
1Y 3 12 4A
2A 4 11 4Y
2B 5 10 3B
2Y 6 9 3A
GND 7 8 3Y
IC610: SN74AHCT1G125DCKR
Single Bus Buffer Gate
OE 1 5 VCC
A 2
GND 3 4 Y
IC616: SN74LVC2G17DCKR
Schmitt-Trigger Buffer
1A 1 6 1Y
GND 2 5 VCC
2A 3 4 2Y
J K L
MCX-1000
IC601: NJM7805FA
Voltage Regulator
INPUT
OUTPUT
COMMON
IC608 : PST600JM
System Reset
1 VCC
3 VOUT
– –
+ +
2 GND
IC615: SN74CBT3306PWR
FET Bus Switch
1OE 1 8 Vcc
1A 2 7 2OE
1B 3 6 2B
4 5
GND 2A
Point 6 Pin 40 of IC602
Point 7 Pin 37 of IC602
Point 8 Emitter of Q603 and pin 36 of IC602
A
B
POWER ON POWER OFF
(Connect the power cable) (Disconnect the power cable)
IC605: AT24C04N-10SI-2.7
EEPROM
VCC
GND
WP
START
SCL
STOP
SDA
LOGIC
SERIAL
EN
CONTROL H.V. PUMP/TIMING
LOGIC
LOAD
COMP
DEVICE DATA RECOVERY
ADDRESS
COMPARATOR LOAD INC
A2
A1 R/W
DATA WORD
EEPROM
A0 ADDR/COUNTER
Y DEC SERIAL MUX
DIN
DOUT/ACK
LOGIC
DOUT
69