Yamaha BD-940, Service Manual, Page: 45 / 60

A
1
2
3
4
5
6
7
8
9
10
B C D E F G H I J K L M N
45
MAIN 1/3
BD-940
SCHEMATIC DIAGRAMS
★
All voltages are measured with a 10MΩ/V DC electronic voltmeter.
★
Components having special characteristics are marked
⚠
and must be replaced
with parts having specifications equal to those originally installed.
★
Schematic diagram is subject to change without notice.
CB203
W200
W202
CB204
IC204
IC203
IC203
IC203
IC203
IC203
IC203
IC205
CB200
CB205
W201
CB206
W203
CB201
CB202
37.0
0
0
11.4
37.0
30.1
30.7
37.0
11.4
9.0 11.4
5.2
0
0
5.2
0
0
0
9.7
0
0
0
30.7
9.6
12.3
12.3
12.3
0
0
0
0
-12.8
12.3
12.3
12.3
7.7
4.8
0
8.3
8.3
0
7.7
0
0
12.3 12.3
0 0
-7.9
5.3 5.3 5.3 5.3 5.3 5.3 5.3
0
0 0
5.3 5.3 5.3 5.2
0 0 0
5.3
5.3
5.3
5.3 5.3
5.3
0
0 0
0
0
0.9
0.6
5.2
5.3
5.3
5.3 5.3 5.3
5.3
5.3
5.3
0 0
0
0.9
5.3
0
0
0 0
5.3
0.4 0
0
0
0
0
0
1.2
1.1
5.2
1.1
5.2
5.3
0
0
0
5.2
5.2
5.3
4.8
2.6
1.0
0
2.6
5.1
5.3
5.3
5.3
5.3
5.3
0
0 0 5.2 -7.9 0 8.0
0 0 0.4
4.8 4.5 3.8
5.3 5.3 5.3 5.3 5.3 5.3 5.3 5.2 5.2 5.2 5.2 30.0 0 0 0 0 0 0 9.0
12.3
0
0
0
0
0
-12.8
-12.8
0
8.0
12.2
12.3
-12.8
-7.9
-8.5
-8.5
8.6
3.8
12.3
12.3
12.3
8.6
POINT A XL200 (Pin 9 of IC204)
A
1
B
2
1 IC205
(2 pin)
IC205
(1 pin)
2
POWER ON POWER OFF
1 IC205
(2 pin)
IC205
(1 pin)
2
POWER OFF
POINT B 1 / IC205 (2 pin), 2 / IC205 (1 pin)
IC204 : R5F21356ANFP
Single chip 16 bit microprocessor
R0H
Timers
Port P0
8 8 8 8 5 1 8
Port P1 Port P2 Port P3
2
Port P5 Port P4 Port P6
System clock
generation circuit
XIN-XOUT
High-speed on-chip oscillator
Low-speed on-chip oscillator
XCIN-XCOUT
Low-speed on-chip oscillator
for watchdog timer
Voltage detection circuit
Comparator A
DTC
UART or
clock synchronous serial I/O
(8 bits x 3)
I
2
C bus or SSU
(8 bits x 1)
LIN module
Comparator B
Watchdog timer
(14 bits)
Timer RA (8 bits x 1)
Timer RB (8 bits x 1)
Timer RC (16 bits x 1)
Timer RD (16 bits x 2)
Timer RE (8 bits x 1)
R8C microprocessor core Memory
I/O ports
Peripheral functions
R0L
R1H R1L
R2
SB
INTB
PC
USP
ISP
FLG
ROM (1)
RAM (2)
Multiplier
NOTES:
1. ROM size varies with MCU type.
2. RAM size varies with MCU type.
R3
A0
A1
FB
A/D converter
(10 bits x 12 channels)
D/A converter
(8 bits x 2)
Vref
Vout
CT
GND
V
DD
N.C.
4
1
2
3
5
–
+
IC205 : BD5242G
Voltage detector IC
MAIN MICRO-
PROCESSOR
MAIN (1)
RESET IC
to MAIN (3)_CB600
Page 47 B4
to MAIN (2)_CB401
Page 46 B5
to POWER_CB3
Page 48 M4
to MAIN (2)_CB803
Page 46 F1
to MAIN (2)_CB800
Page 46 E3
To BD module P.C.B.
To BD module P.C.B.
To BD module P.C.B.