Service manual

MD-R2
– 28 –
Figure 28 BLOCK DIAGRAM (1/2)
D6.5/4.75 ~ 5.25V
MECHAN1SM 6.5/4.75~5.25V
D3.2V
SYSCLK DVDD DVDD
D3.2V
DIGITAL 3.2V
D3.2V
D4.3V
D4.3V
D3.2V
D4.3V
D3.2V
BACKUP
VOLTAGE
REGULATOR
POWER
IC1402
S29294A
E
2
PROM
IC1601
M56758FP
5-CH
MOTOR
DRIVER
BACKUP
MD MICRO COMPUTER
IC1401
IX0232AW
MD SYSTEM
MICRO
COMPUTER
DIGIN(EIAJ)
PDOWN
DIGOUT(EIAJ) GND GND
1 2 4
3
BCLK MUTE DFS0 DADATA LRCLK ADDATA DFS1
LOAD IN
RESET MD-ST DSCK SERCH
1 2
24 23 22 21
20
19 18 17 16 15 14
4 5 6 7 8 9
13 10
11
12
3
D.GND D.GND D.GND D.GND DSTB MDDATA KDATA
4M
DRAM
ENDEC
ATRAC
IC1201
LR376481
OSCILLATOR
XL1201
(33.8688MHz)
SW1956 SW1955 SW1954 SW1953 SW1952
Q1251~Q1254
MD
RECORDING HEAD
M901 SPINDLE MOTOR
M902
SLED MOTOR
M903
LOADING SWITCH RECSWITCH PLAYSWITCH LEAD INSWITCH
A–BSIGNALE–FSIGNAL
RF1 ~ RF4SIGNAL
HEAD DRIVE
SIGNAL
IC1251
IC1101
IR3R55
RF
SIGNAL
PROCESSOR
LOADING MOTOR
HEAD UP/DOWN
M
M
DIRECT SWITCH WRITE PRO
M
LASER DIODE
MONITOR DIODE
RF4 RF3 RF2 RF1
LIGHT
RECEIVING
SECTION
ERROR
SIGNAL
LIGHT
RECEIVING
SECTION
RF
F A B E
FOCUS
TRACKING
PICK UP UNIT
IC1202
IX2474AF
CN1904
CNP1902
IC1906 AND GATE TC7ST08F IC1907 CLOCK GENERATOR TC9246F IC1990 INVERTOR 74AC04FS
IC1916 AND GATE 74VHC08F