Schematic Diagrams - Yamaha NX-A01 Service Manual

A B
NX-A01
1
MAIN 2/2
2
3
4
5
6
7
8
# All voltages are measured with a 10MΩ/V DC electronic volt meter.
# 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.
9
16
C D E
UPD789022GB-A70-8ES-A
MICRO-
PROCESSOR
A-2
F G H
1
2
B-1
Status indicator (LED)
POINT A-2 Pin 14 of IC501 POINT B-1
1 Q502 (E)
2 Q501 (C)
POWER ON
(connect the power cable)
I J
Page 15 E5
to MAIN (1)_CB302
IC501 : µPD789022GB-A70-8ES-A
8bit single-chip controller
8-bit timer
TI0/TO0/P50
event/counter 00
TO2/P51
16-bit timer 20
CPT2/INPUT2/P32
78K/0S
CPU core
Watchdog timer
SCK0/ASCK/P20
Sereal
SO0/TxD/P21 RAM
Interface 00 256 bytes
SI0/RxD/P22
INTP0/P30-INTP2/
Interrupt
CTP2/P32
V V
control DD0 SS0
KR0/P40-KR7/P47 V V
DD1 SS1
44 43 42 41 40 39 38
P12
1
P11 2
P10 3
P47/KR7 4
MAIN (2)
P46/KR6 5
P45/KR5 6
P44/KR4 7
P43/KR3 8
P42/KR2 9
P41/KR1 10
P40/KR0 11
12 13 14 15 16 17 18
1 /EMITTER of Q502, 2 /COLLECTOR of Q501
1 Q502 (E)
2 Q501 (C)
POWER OFF POWER ON
(disconnect the power cable) (connect the power cable)
K L
Port 0 P00 to P07
Port 1
P10 to P17
ROM
Port 2
4 KB P20 to P22
Port 3
P30 to P32
Port 4
P40 to P47
Port 5
P50 to P53
RESET
System
X1
IC
control
X2
37 36 35 34
P03
33
32 P04
31 P05
30 P06
29 P07
28 P20/ASCK/SCK0
27 P21/TxD/SO0
26 P22/RxD/SI0
25 P30/INTP0
24 P31/INTP1
23
P32/INTP2/CPT2
19 20 21 22