Sony ICD-MX20DR9 Service Manual page 28

ICD-MX20DR9
• IC Block Diagrams
– AUDIO Board –
IC1503 XC9502B092AR
PWM/PFM
1
EXT1
CONTROLLER1
PWM
COMPARATOR1
VDD 2
FB1 3
ERROR AMP1
RAMP WAVE
GENERATOR1
4
PWM1
VREF1=0.9V
WITH SOFT START1,
5
EN1
EN1
EN1 TO
INTERNAL CIRCUIT
IC1304 NJU6366AF1 (TE1)
3
RF
CG CD
4
ICD-MX20DR9
PWM/PFM
10
EXT2
CONTROLLER2
PWM
COMPARATOR2
9 GND
8 FB2
ERROR AMP2
RAMP WAVE
GENERATOR2
7
PWM2
OSC VREF1=0.9V
GENERATOR WITH SOFT START2,
6
EN2
EN2
EN2 TO
INTERNAL CIRCUIT
2 1
1/2 1/2 1/2
3-STATE
BUFFER
A B C D
5 6
– MAIN Board –
IC4201 RX-4591CF
32.768kHz
VDD 1
2
FOE
3
XIRQ
T1 4
5
FOUT
28 28
CLOCK
AND
OSC DIVIDER
CALENDAR
FOUT TIMER
CONTROLLER REGISTER
INTERRUPTS ARARM
CONTROLLER REGISTER
DI
CONTROL
DO BUS REGISTER
CLK INTERFACE AND
CIRCUIT SYSTEM
CE
CONTROLLER
CE
10 CE
CLK
9
CLK
DO
8
DO
DI
7 DI
6
GND