Sony Walkman NWZ-A726 Service Manual page 26

NWZ-A726/A726B/A728/A728B/A729
5-9. SCHEMATIC DIAGRAM - MAIN Board (5/6) -
1 2
MAIN BOARD (5/6)
5
A
VDD_DDC2_J
MAIN
BOARD R302
0
(6/6)
VDD_HP_F
(Page 27)
R304
150k
1 EN2
XC6401FF58DR
2
VIN
B
3
EN1
R305 C305
220k 10
IC301
+1.8V REGULATOR
HP_XMUTE
XCRD_LINEOUT
C
10
ADA_XRST
C303
D
MAIN
C301
BOARD
0.001
(1/6)
C302
(Page 22)
PCM0_ADDT
CPU_REFCLKO
R314 0
PCM0_BCK
PCM0_DADT
E
PCM0_LRCK
F
SPI0_MOSI
SPI0_CLK
SPI0_XCS2
AGND
C326
0.47
DGND
G
TB301
(CHASSIS)
NWZ-A726/A726B/A728/A728B/A729
• See page 31 for IC Block Diagrams. • See page 33 for IC Pin Function Description.
3 4 5
IC B/D
VOUT2 6
IC301
5
VOUT1
4
GND VSS
C307 C316 R310 R312
7
10 22 0 0
6.3V
24 23 22 21 20 19 18 17
nRESET ADC_FILT+
0.1
VL
VD DAC_FILT+
IC302
0.1
DGND
SDOUT A/D CONVERTER,
D/A CONVERTER,
MCLK HEADPHONE AMP
R315 220
SCLK
IC302
CS43L21-CNZR
SDIN
AGND
1 2 3 4 5 6 7 8
C308
1
C306
0.1
C327 C328
C329 C330
0 0 0 0
Note 1: When the MAIN board is replaced, format it according to the "NOTE OF MAIN
BOARD REPLACING" (refer to page 4) of the servicing notes.
6 7 8
IC305
HEADPHONE/WM-PORT
SELECTOR
IC B/D
Q301, 304
MUTING CONTROL
SWITCH
C312 22
C313 0.1
C314 1
VQ
C315 1
AGND
C310 0.1
VA
AOUTA
AOUTB
VSS_HP
R307 R313
C311
1k 1k
1
C107 C207
0.068 0.068
R108
470
R105 R205 C319 C321
47 47 4.7 0.022
26 26
9 10
R120 470
R220 470
10 9 8 7 6
1 2 3 4 5
C116 C216
0.0047
0.0047
C208
0.1
R223 R123
0 0
R206 R106
5.6 5.6
FB201
FB101
R208 R109 R209
470 470 470
D201
RSB6.8STE61
-1 -2 -1 -2
C110
0.22
FB301
C210
Q302 Q303
0.22
EMX18 EMX18
D301
MUTING MUTING
VMZ6.8NT2L
Note 2: IC301, IC302 and IC305 on the MAIN board cannot exchange with single. When IC301, IC302
and IC305 on the MAIN board are damaged, exchange the entire mounted board.
11 12 13
CL201
2
LINE_OUT_R
CL101
LINE_OUT_L
MAIN
BOARD
(6/6)
(Page 27)
CN301
11P
1 MIC_RIN
2 MIC_RIN
3 HP_R
CL202
4 HP_R
CL102
5 COM
J301
6 COM
7 COM
8 MIC_L
HP FLEXIBLE
9 MIC_L
PRINT BOARD
10 HP_L
11 HP_L