Sony MZ-R50 - MD Walkman MiniDisc Recorder Service Manual page 44

IC506 MPC18A20VM
29
30 28
OP
1 3
2
IC BLOCK DIAGRAMS – MAIN (2/3) SECTION –
r
IC804 DS1302Z
VCC2 1
X1 2
OSCILATOR
AND DIVIDER
X2 3
GND 4
IC806 MB3800PNF
-IN 1
ERROR
2 AMP
SCP
+
0.5V
VCC 3
4
BR/CTL
–
26
27 25 24
PRE DRIVER
COMP
+
SAW
COMP
VREF
PRE
DRIVER
5 6
4 7
REAL TIME
CLOCK
DATA BUS
COMMAND AND
RAM
ADDRESS BUS
CONTROL LOGIC
REFERENCE SAW-WAVE
GENERATOR
VOLTAGE
0.1V
1.25V
_
36K
500
DTC 0.6V
SOFT START
S.C.P.
23 22 21 20 19
CLK
CHARGE PUMP
OSC
EFM
LOGIC
8 9 10 12
11
INPUT CHIFT
REGISTERS
OUTPUT
DRIVE
CONTROL
CIRCUIT
0.3V
– 62 –
18 17 16
SAW
CONTROL
LOGIC
EN ENB
SAW
BIAS
VREF
15
13 14
8 VCC1
SCLK
7
6 I/O
RST
5
8 FB
OSC
7
30K
GND
6
5 OUT