Sony Walkman WM-EX20, Service Manual

Page: 13 / 20

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6-5. IC BLOCK DIAGRAMS
IC301 TA2123AF
+
–
+
–
AGC
DET
BST
PWC
PWB
+
–
PWA
+
–
+ –
+ –
+ –
TOMP
RIPPLE
FILTER
MIX
MTL DRV
VREF
PREA
PREB
BEEP
SW
36 35 34 33 32 31 30 29 28 27 26 25
24
22
21
20
19
18
17
16
15
14
13
23
12 11 10 9 8 7 6 5 3 2 1 4
48
47
46
45
44
43
42
41
40
39
38
37
AGC DET AGC IN BST NF BST OUT PW IN C LPF EQ L PW NF L PW IN L PW IN R PW NF R EQ R
RF IN
PW GND
PW OUT R
PW OUT C
PW OUT L
VCC
BASE
RF OUT
GND
AMS DET
AMS MIX
AMS IN
VREF IN
PRE GND
M/N SW
PRE SW
F/R SW
BST SW
PW SW
NT SW
AMS OUT
BEEP
MT TC
CAMP SW
AMS IN
PRE NF-R
PRE OUT-R
MTL DRV-R
MTL DRV-L
PRE OUT-L
PRE NF-L
REV IN-L
REV IN-R
REF OUT
FWD IN-R
FWD IN-L
IC701 XC6372A211PR
+
–
+
–
BIAS
CIRCUIT
WEIGHT
G2 G1 V/I
ACH BLOCK
GM
SUN
BCH BLOCK (SAME ACH)
14 13 12 11 10 9 8
1 2 3 4 5 6 7
GND I
REF
V
REF
INB OUT B DC B DET B
Vcc SW V
EXT
IN A OUT A DC A DET A
IC601 LB1994M
DECODER
CTRL
BLOCK
POWER
D/DT PULSE
BUFFER
COMPARATOR BUFFER VI
COMPARATOR
SOFT CLIP
CURRENT
AMP
P-SIG
PW•SW
4 5 6 1 2 9 7 8
14
15
16
17
18
19
20 21 22 24 23 25 26 27
30
29
28
36
35
34
33
32
31
WS MC
U IN
3
VCC V IN
W IN
CTRL1 CTRL2
DIR
VS
US
U OUT
NC
V OUT
W OUT
WT
VT
UT
PGND FC CT2 CT1 IR ICI2 ICI1 I SOFT
M CENTER
GND
VI2
VI1
IV
VC
13 PW
12 CI
11 Vref
10 P SIG
IC703 MM1305BWBE
+
–
+
–
+
–
+
–
1
2
3
4
8
7
6
5
VCC
CE
RIPPLE
GND
OUT 1
OUT 2
OUT 3
OUT 4
IC303 NJM2185AV
IC302 NJM2190V
9
Lin
VREF C3
GND
C4
MODE
Rout REFin
W
out
C2
V+/2 V+
Lout
C1
Win
Rin
10 11 12 13 14 15 16
1 5 2 3 4 6 7 8
–
+
EXT
FILTER
MA
TRIX
MODE
CONTROL
BIAS
BYPASS
BYPASS
SRS
SRS
3
1
BUFFER
PWM/PFM CONTROL
OSC 50/100/180 kHz
VLx LIMITER
PHASE COMP
V REF
SLOW START
2
Lx
Vss
V OUT