Yamaha CD-S300 Service Manual page 42

A B C
CD-S300
MAIN 2/2
1
2
DC/DC CONVERTER
12.2 2.4
3
IC301
2.4
4
CB301 0
12.2
7.3 5.0 5.0
0
5
0
Page 45 M4
5.0
to OPERATION (8)_CB806 5.0
LINER
0
-5.0 REGULATOR
-4.4
3.3
-4.5
6 0
3.3
3.3
-4.5
-4.5
-4.5 -4.5
7
ANALOG OUT L
0
2.5
0
2.5
Page 44 B6
5.0
to OPERATION (4)_CB601
-5.0
-4.5
CB303
8
IC301: BD9870FPS-E2 IC302: PCM1780DBQR
High stand voltage 1 channel step-down switching regulator
Audio digital-to-analog converter
VCC
1
BCK
Audio
LRCK
Serial
DATA Port
VREF
PWM COMP DRIVER
Oversampling
9 (FMT)
OSC
MS (DEMP0) Function
STBY Serial
Control
Control
5 MC (DEMP1)
STBY Port
CTL
MD (MUTE)
LOGIC OUT
2
(TEST)
TSD OCP
System Clock
System
SCK
Clock
INV
Error AMP
Manager
4
SS
FIN
GND
(1) Open-drain output for thePCM1782
10
NOTE: Signal names in parentheses ( ) are for the PCM1781.
★ All voltages are measured with a 10MΩ/V DC electronic voltmeter.
● 電圧は、内部抵抗 10MΩの電圧計で測定したものです。
★ Components having special characteristics are marked
and must be replaced ●
with parts having specifications equal to those originally installed. 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。
★ Schematic diagram is subject to change without notice.
● 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。
42
D E F
0
3.3
3.3
5.0 3.3
IC303
5.0 3.3
3.3
0 0
3.3
5.0 3.3
3.3
CB302
3.3
3.3
3.3
3.3
EEPROM
0
0
0
2.5
3.3
2.5 3.3
2.5 1.6
0 1.2
5.0 1.7
1.7
ANALOG OUT CB305
1.7
(Writing port)
AUDIO DAC
POINT C XL301 (Pin 10 of IC305)
Output Amp V OUT L
DAC and
Low Pass Filter
4/8
Enhanced
Digital
Multilevel
Filter V COM
Delta Sigma
With
Modulator
Output Amp
DAC and
Low Pass Filter V OUT R
Zero Detect
Power Supply
ZEROL/NA 1 16 ZEROR/ZEROA
MS 2 15 V L
OUT IC303: R1172S331B-E2-F
MC 3 14 V R
OUT CMOS-based positive-voltage regulator IC
MD 4 13 V COM
SCK 5 12 AGND
DATA 6 11 V
CC
V DD 6
BCK 7 10 NC
LRCK NC
8 9
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、
CE 3
G H
Page 43 B5
to OPERATION (1)_CB701
0
0
0
0
0
0
1.7 0
MICROPROCESSOR
0 0
0
0
0 3.3
3.3
0
IC305
0.9
0
0
0
0 3.2
0 3.3
0 0
3.3 0
3.3 C 0
3.3 3.3
3.3
3.3
3.3
3.3
3.3
3.3
RESET IC
IC306 2
3.3 1.8
3.3 3.3
3.3 D
3.3
0
1
POINT D 1 / IC306 (2 pin), 2 / CB306 (1 pin)
IC306 1 IC306 1
(2 pin) (2 pin)
IC306 2 IC306 2
(1 pin) (1 pin)
POWER ON POWER OFF POWER ON
IC304: LE24C023M-TLM-E
Two wire serial interface EEPROM
WP
Write controller
1 V OUT
SCL
Vref Pin No. Symbol Description
1 V Output Pin of Voltage Regulator
Current Limit OUT
2, 5 GND Ground Pin
2,5 GND
3 CE Chip Enable Pin
SDA
4 NC No Connection
6 V DD Input Pin
I J K
Page 44 B3
to OPERATION (9)_CB901
IC309
IC309
IC309
IC309
IC309
3.3
3.3
3.3
IC313
3.3
0
Key detection for A/D port
Key input (A/D) pull-up resistance 10 k-ohms
Ohm 0 + 820 + 3.3 k + 12.0 k
V 0 0.2 – 0.3 0.9 – 1.0 2.0 – 2.1
A/D value (3.3V=255) 0 15 – 25 70 – 78 153 – 162
KEY0 (58 pin) – STOP PAUSE OPEN/CLOSE
KEY1 (59 pin) – PLAY SKIP +/SEARCH + SKIP -/SEARCH -
Ohm 0 + 100 + 3.3 k + 12.0 k
V 0 0.03 – 0.1 0.8 – 0.9 2.0 – 2.1
A/D value (3.3V=255) 0 3 – 7 60 – 70 150 – 160
KEY2 (60 pin) – PURE DIRECT CD/USB –
IC306: BD5229G-TR
Voltage detector IC with adjustable output delay
V
DD
High voltage generator 2
1 Vout
EEPROM Array
–
+
NC 1 8 Vref
VDD
Y decoder and Sense AMP
4 NC
NC 2 7 WP
NC 3 6 SCL
Serial-Parallel converter
GND 4 5 SDA
3 5
GND CT
L M N
DIGITAL OUT
0
5.0
OPTICAL
1.7
OUTPUT
DIGITAL
5.0 OUT
2.8
2.2
COAXIAL
CB308
IC307
JK301
IC308
JK302
IC305: R5F212CASNFP
Single chip 16 bit microprocessor
8 8 8 8 3 2 8
I/O ports Port P0 Port P1 Port P2 Port P3 Port P4 Port P5
Peripheral functions
UART or
System clock
clock synchronous serial I/O generation circuit
(8 bits x 3)
Timers
XIN-XOUT
High-speed on-chip oscillator
Timer RA (8 bits x 1) I 2 C bus or SSU
Low-speed on-chip oscillator
Timer RB (8 bits x 1) (8 bits x 1) XCIN-XCOUT
Timer RC (16 bits x 1)
Timer RD (16 bits x 2)
Timer RE (8 bits x 1)
Timer RF (16 bits x 1) LIN module
Watchdog timer
(15 bits)
A/D converter
(10 bits x 20 channels)
D/A converter R8C/Tiny Series microprocessor core Memory
(8 bits x 2)
R0H R0L SB ROM (1)
R1H R1L
USP
R2
ISP
R3
RAM (2)
INTB
A0
PC
A1
FLG
FB
Multiplier
NOTES:
1. ROM size varies with MCU type.
2. RAM size varies with MCU type.