Sony Walkman MZ-R900 Service Manual page 33

MZ-R900
• IC Block Diagrams
IC301 AK4562VNS-L
21 20 19 18 17 16 15
CLOCK
CONTROL
CCLK 22
DIVIDER
REGISTER
CSN 23
I/F
AUDIO I/F
PDN 24
14 VT
CONTROLLER
SSB 25
13 DGND
LOUT1 26
A/D CONVERTER
12 VD
/HPF
OPGAL 27 11 VREF
ROUT1 28 10 VA
GAIN GAIN
AMP AMP
9 AGND
GAIN
AMP 8 VCOM
GAIN
AMP
1 2 3 4 5 6 7
IC302 AN7536FHNABV
16 15 14
HEADPHONE
/LINE MUTE BEEP
SW
–
+
R IN 1
GND 2
L IN 3
+
–
RIP FI 4 RF1 RF2
5 6 7
IC303 NJM2173APC1 (TE2)
13
12 11
OUT 1 13 AMP 1
NC 14
NC 15
OUT 2 16 AMP 2
12 ROUT
1 2
11 GND
10 L OUT
9 GA L
8
IC501 SN761057DBT
TE 1
REXT 2
Wpp LPF 3
VREF 4
C
5
D 6
D-C
7
Iy 8
Ix
9
Jx 10
Jy 11
A
12
A-C
13
B 14
TON-C 15
CIG 16
CDN
17
PD-NI 18
PD-I 19
PD-O 20
10 9
ADFG
21
8 NOISE
DVDD 22
7 GND
REG
6 V+
GV
5 STBY
3 4
32 32
44 ADIP-IN
43
S-MON
A+B+C+D TWpp
I+J PK/BTM
NPP Aw
TON CSLO
CSL VREF075
Aw+Dw A-C
S-MONITOR
TON Peak D-C
TON Botm Malfa
ADIP Mij
TE AwBPF
TE Dw
TEMP
DwBPF
42 FE
Tpp/Wpp
41 ABCD
40 OFC-C1
39 OFC-C2
38 AVCC
PS
37
36
LP
RF
35 EQ
34 AGND
FE
33 RF
32 CCSL2
VC
ABCD 31
30 VREF075
29 PEAK
PEAK/BOTM
28 BOTM
OF TRK
DGND
27
26 OFTRK
T-ON
APC
25 RESET
SERIAL
24 SCK
I/F
23 SBUS
ADIP
32