Block Diagram; Overall - Sony CDP-D12 Service Manual

Overall

MG-398SC
DECK
MECHA
IC901
FL
RC232
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
CDP-D12

Block Diagram

IC404
DRAM
SHOCK
PROOF
IC403
PLL
DIVIDER
IC405
IC101
384FS
SYSTEM CONTROL
IC401
Q602
PH601
603
IC601 IC602
602
604
I/O CTRL-S
RELAY
Section 4
P/A
768FS
CONVERTER
IC102
PLL
4MHz
E2PROM
+15V
IC402
-15V
+33V
Q601
+5V
+6V
IC702 KEY
3.5V_AC
SIRCS
3.5V_AC
RECIVER
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.
IC502
DIGTALOUT
IC501
OPT
IC503
DIGTALOUT
COAX
IC103
ANALOG
UNBAL
+4/-10dB
IC121
SW
H.P
ANALOG
BAL
IC153
IC253
REG
IC24
REG
IC25
Q402
POWER
IC24
Q403
4-1