Sony WM-EX900 Service Manual page 15

• IC Block Diagrams
IC301 TA2123F
CAMP SW 37
MT TC 38
BEEP 39
AMS OUT 40
NT SW 41
PW SW 42
BST SW 43
F/R SW
44
PRE SW 45
M/N SW 46
PRE GND 47
VREF IN 48
IC302 NJM2185AV
IC703 XC6383C251ML
CE
1
V OUT
2
NC
3
36 35 34 33 32 31
–
AGC
BST
DET
+
BEEP
SW
TOMP
PREA
PREB
VREF
1 2 3 4 5 6
Vcc SW V IN A
EXT
14 13 12 11
+
–
SUN
BIAS
CIRCUIT
1 2 3 4
GND I V INB
REF REF
CHIP ENABLE
VDD
V REF
+
2 STEP PFM CONTROL
OSC 100/180 kHz
–
+
–
– 19 –
30 29 28 27 26 25
–
PWB
+
PWC
–
PWA
+
RIPPLE
FILTER
MIX
MTL DRV
7 8 9 10 11 12
OUT A DC A DET A
10 9 8
G2 G1 V/I
WEIGHT
GM
–
+
ACH BLOCK
BCH BLOCK (SAME ACH)
5 6 7
OUT B DC B DET B
VLx LIMITER
BUFFER
24 RF IN
23 PW GND
22 PW OUT R
21 PW OUT C
20 PW OUT L
19 VCC
18 BASE
17 RF OUT
16 GND
15 AMS DET
14 AMS MIX
AMS IN
13
LX
5
VSS
4