Block Diagram - Power Supply Section - Sony MDR-NC500D Servise Manual

MDR-NC500D
5-2.

BLOCK DIAGRAM - POWER SUPPLY Section -

POWER BOARD (1/2)
LED DRIVE
Q802
(POWER)
(AI NC MODE)
LED DRIVE
Q801
MDR-NC500D
POWER BOARD (2/2)
SYSTEM CONTROLLER
IC801 (2/2) MONITOR
KEYMON 24
18 LED_B KEYPOWER 26
VBATT 40 POWER
ON OFF
D802
DDCE 4
MODE BOARD
AI NC MODE
30 LED_R KEYMODE 25
RESET BOARD
RESET
_RESET 5
Q475
BATTSEL 6
DC/DC CONVERTER
IC472
D+2.1V 4 SW1
Vin 3
A+3.3V 6 SW2
SWITCHING
Q474 (1/2)
2 7
RESET SIGNAL
GENERATOR DC/DC CONVERTER
IC802
IC473
D+1.35V 4 SW1
B+ SWITCH
Vin 3
D+2.8V 6 SW2 Q472, 473
SWITCHING
Q474 (2/2)
2 7
14 14
POWER/CHARGE CONTROL
IC402
15 OUT BAT 5
16 OUT BAT 6
17 OUT
IN 4
ISET2 7
MODE 8
JACK BOARD (2/3)
STAT1 2
(CHARGE)
TS CE
12 9
SWITCH
Q404
Q402
VOLTAGE SWITCH
DETECT Q403
IC471
TH401
SWITCHING
Q405
SD
A
BATT101
LITHIUM ION
BATTERY
DC/DC
3.7V 1,260mAh
CONVERTER
IC401, Q401
VOLTAGE
DETECT
IC403
JACK BOARD (3/3)
VOLTAGE
DETECT
IC404
− +
VOLTAGE
DC IN 6V
DETECT
IC405