4-1
CDP-D12
Overall
Circuit Description
The compact disc player CDP-D12 consists of the five
circuit boards are described below excluding the option
boards.
.
MAIN board (System control, clock and audio circuits)
.
SERVO board (Servo control)
.
POWER board (Power supply)
.
DISPLAY board (Display and function keys)
.
HP board (Headphones)
1. MAIN board
The MAIN board consists of the 128 kbyte ROM, 4 kbyte
RAM, interrupt controller, keyboard display, parallel
interface, etc. The CPU system clock is 4 MHz. The audio
data is converted by passing through the digital filter and
D/A converter, and is output from the LINE output
connector.
2. SERVO board
The RF signal that is picked up from the CD mechanism
deck (MG-398SC) passes through the EFM comparator, is
Section 4
Block Diagram
3.5V_AC
3.5V_AC
+6V
+5V
+33V
-15V
+15V
Q402
Q403
POWER
IC25
REG
REG
IC24
IC24
BAL
ANALOG
H.P
UNBAL
ANALOG
COAX
DIGTALOUT
OPT
DIGTALOUT
SW
+4/-10dB
768FS
384FS
IC253
IC153
IC121
IC103
IC503
IC502
Q601
4MHz
RECIVER
SIRCS
CTRL-S
RELAY
I/O
RC232
DECK
MECHA
MG-398SC
IC402
DIVIDER
IC405
KEY
IC702
IC602
IC601
IC901
FL
IC501
IC102
CONVERTER
P/A
IC101
PLL
E2PROM
DRAM
IC404
IC403
PROOF
SHOCK
604
603
Q602
602
PH601
PLL
IC401
CONTROL
SYSTEM
decoded and receives the error correction in the digital
signal processing block. The audio data is output to the
MAIN board.
3. POWER board
The AC primary power that is input from the AC inlet to
CN3 via the POWER switch passes through the line filter
(C3) and enters the power transformer via CN4 (for J
destination) or CN5 (for UC destination) or CN6 (for CE/
CN destination). The AC primary power input is converted
to the AC secondary power by the power transformer and
enters the MAIN board via CN24.
4. DISPLAY board
The DISPLAY board consists of the entry keys and FL
(fluorescent tube) that displays the disc data (such as time
information, etc.)
5. HP board
The HP (headphone) board consists of the headphones
amplifier, potentiometer for level control and the output
jack.
Содержание CDP-D12
Страница 1: ...COMPACT DISC PLAYER CDP D12 SERVICE MANUAL 1st Edition ...
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Страница 54: ...Printed in Japan Sony Corporation 2003 10 16 2003 CDP D12 UC CE CN E 9 976 920 01 ...