Sony Walkman WM-EX921, Руководство по обслуживанию

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WM-EX921
15 15
+
–
+
–
CHIP ENABLE
V REF
VDD
2 STEP PFM CONTROL
OSC 100/180 kHz
VLx LIMITER
BUFFER
1
2
3 4
5
CE
V OUT
NC
LX
VSS
8 9 10 14 13 12
2 1 3
A-CH BLOCK
11
7 6 5 4
G2
G1
V/I
WEIGHT
BIAS
CIRCUIT
+
–
+
–
GM
SUM
V+
SW VEXT OUT
A
DCA
DET
A
INA
GND
IREF
VREF
OUTB
DCB
DETB
INB
B-CH BLOCK: SAME AS A-CH.
• IC Block Diagrams
IC301 TA2123AF (EL)
PRE A PRE B
MIX
PW B
PW A
PW C
BST
MT TC
BASE
RF IN
PW GND
OUT B
OUT C
OUT A
VCC
RF OUT
VREF OUT
BST NF BST OUT PW IN C LPF EQ A PW NF A PW IN A PW IN B PW NF B
3
IN A-R
5
PRE NF-A
6
PRE OUT A
7
MTL DRV A
8
MTL DRV B
9
PRE OUT B
10
PRE NF-B
11
AMS IN
12
IN B-R
4
IN B-F
2
IN A-F
1
21
20
19
18
17
GND 16
AMS DET 15
AMS MIX 14
AMS SW 13
22
23
24
38
C-AMP SW 37
PW SW 42
MT SW 41
F/R SW 44
BST SW 43
M/N SW 46
PRE GND 47
VREF IN 48
PRE SW 45
AMS OUT 40
BEEP 39
26 27 28 29 30 31 32 33 34
DET
36
AGC IN
35
+
–
+ –
+ – + –
+
–
+
–
EQ B
25
RIPPLE
FILTER
AGC
DET
BEEP
VREF
SWITCH
COMPARATOR
MTL DRV
IC303 NJM2185AV-TE2
IC601 LB1994M-TLM
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
IC701 XC6383C251ML