Yamaha NX-A01 - Speaker Sys, Service Manual

Page: 16 / 22

NX-A01
A
1
2
3
4
5
6
7
8
9
B C D E F G H I J K L
16
UPD789022GB-A70-8ES-A
Status indicator (LED)
★
All voltages are measured with a 10M
Ω
/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.
MAIN 2/2
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
4
.8
0
.1
0
.1
0
.1
0
.1
0.1
0.1
4.8
4.6
4.8
0
2.4
2.9
0.1
0.1
0.1
2.7
0
0
4.8 4.8
4.8
4
.8
0 0
4
.9
0
2.7
1.6
1.6 4.8
4.8
4.8
4.8
1.6
1.6
1.6
0
4
.8
0
0
.1
0
.1
7
.5
6
.8
1
1
.5
12.1
12.1
4.9 5.2
6
.8
0.1
0.1
0.1
0.1
5
.1
0
.1
2
1
A-2
B-1
MAIN (2)
MICRO-
PROCESSOR
to MAIN (1)_CB302
Page 15 E5
POINT A-2 Pin 14 of IC501 POINT B-1 1 /EMITTER of Q502, 2 /COLLECTOR of Q501
1 Q502 (E)
2 Q501 (C)
POWER ON
(connect the power cable)
1 Q502 (E)
2 Q501 (C)
POWER ON
(connect the power cable)
POWER OFF
(disconnect the power cable)
IC501 :
µ
PD789022GB-A70-8ES-A
8bit single-chip controller
8-bit timer
event/counter 00
78K/0S
CPU core
ROM
4 KB
RAM
256 bytes
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
P00 to P07
P20 to P22
P30 to P32
P40 to P47
P50 to P53
RESET
X1
X2
IC
36 35 34
22
33 1
32
P03
P02
P50/TI0/T
O
0
P51/T
O
2
P52 P53
RESET
X1 X2 IC
NC
P12
P04
37 38 39 40 41 42 43 44
V
DD0
V
DD1
V
SS0
V
SS1
P10 to P17
Sereal
Interface 00
Interrupt
control
16-bit timer 20
CPT2/INPUT2/P32
SI0/RxD/P22
KR0/P40-KR7/P47
INTP0/P30-INTP2/
CTP2/P32
SO0/TxD/P21
SCK0/ASCK/P20
TI0/TO0/P50
TO2/P51
Watchdog timer
System
control
2 P11
3 P10
4 P47/KR7
P46/KR6 5
P45/KR5 6
P44/KR4 7
P43/KR3 8
P42/KR2 9
P41/KR1 10
P40/KR0 11
31 P05
30
P06
29 P07
28 P20/ASCK/SCK0
P21/TxD/SO0
P22/RxD/SI0
P32/INTP2/CPT2
P31/INTP1
P30/INTP0
27
26
25
24
23
21 20 19 18 15 14 13 12 17 16
P13 P14 P15 P16 P17 V
SS1
V
DD0
V
SS0
V
DD1
NC P01 P00