Sony MDR-NC300D, Service Manual

Page: 8 / 24

MDR-NC300D
MDR-NC300D
8 8
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM
A +2.8V
R-CH
HEADPHONE
ASSY (1/2)
AUDIO IN L
AUDIO IN R
: AUDIO
: MIC
SIGNAL PATH
R-ch is omitted due to same as L-ch.
R-CH
R-CH
MIC L SIG
MIC R SIG
R-CH
HEADPHONE
ASSY (2/2)
LIQUID
CRYSTAL
DISPLAY
PANEL
MDD L-P
MDD L-N
R-CH
MDD R-P
MDD R-N
LINE AMP,
MIC AMP
IC301
DSP
IC501
MIC BIAS
Q101
POWER ON
DETECT
Q602
AINMAINL 9
AINSUBL 6
OUTPL 84
OUTNL 85
X501
49.152MHz
XfsoOUT
XfsoIN
30
33
SYSTEM CONTROLLER
IC601
S602
MONITOR
14 RESET_N KM_RESET G2
I2C_SDA G8
I2C_SCL F6
KM_IO1 C6
KM_IO2 A8
SDA 50
SCL 47
GPIO1 52
GPIO2 51
MAINPWR_EN
VDD
F5
BATTCHK_EN F8
KM_STANDBY F2
STANDBY_N 28
LCD_/RES A6
LCD_SCL C4
LCD_/CS1 B6
LCD_A0 B4
LCD_SI B3
KEY_MONITOR E8
S603
SOUND MODE
KEY_SOUND D7
S604
NC OPTIMIZE
KEY_NCOPTIMIZE E7
S605
VOLUME -
KEY_- D8
S606
KEY_+ D4
KEY_POWER D5
BATTERY
DETECT
Q601
KEY_HOLD D6
S607
POWER
(NEUTRAL)
HOLD
A_PWR +1.5V
D +2.8V
DRY BATTERY
SIZE “AAA”
(IEC DESIGNATION R03)
1PC. 1.5V
C3 VBATT_CHECK
RESET SIGNAL
GENERATOR
IC602
+2.8V
REGULATOR
IC405
A +2.8V
+2.8V
REGULATOR
IC404
LINE AMP +1.4V
+1.4V
REGULATOR
IC304
MIC AMP R +1.4V
+1.4V
REGULATOR
IC303
MIC AMP L +1.4V
+1.4V
REGULATOR
IC302
1.5V
+1.5V
REGULATOR
IC407
A_PRI +1.5V
DC/DC
CONVERTER
IC408, 409, Q404
G4 _RESET
F4
REG15_EN
+1.5V
REGULATOR
IC406
+1.5V
REGULATOR
IC403