Sanyo DC-BM500, Service Manual

Page: 17 / 41

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IC BLOCK DIAGRAM & DESCRIPTION
1
4
5 2 3
VCC
HEAD
SWITCH
CTRL1
CTRL2 GND
IC470 BA7755A (Head Switch) IC460 AN7348K ( Play/Rec Pre Amp)
Nor/Cro
& Hi/Lo
Logic
R
R
P
R
P
P
ALC
Mute
Mute
Logic
A/B
Logic
Rec/PB
Ripple
Rejection
Rec
Amp(L)
Rec
Amp(R)
PB Amp(L)
PB Amp(R)
A/Rec
A/Rec
B
B
1 2 3 4
5 7 6
8
9
10 12 11
13 14 15 16 17 18 19 20 21 22 23 24
L-PB AMP
R-PB AMP
R-PB NF
R-PB EO
R-PB OUT
AB SW
R-REC OUT
R-REC IN
REC/PB SW
A/B SW
FIL
TER
GND
VCC
CR
O/NOR
HI/LO ALC L-REC OUT L-REC IN ALC L-PB AMP OUT L-PB EO L-PB NF R-PB AMP
L-PB AMP
5
7
9
11
1 6
2
3
10
8
4
MUTE/
ST-BY
IN (L)
IN (R)
IN- (L)
IN- (R)
GND
OUT (L)
OUT (R)
-Vs
+Vs
IC440 TDA7265 (Stereo Amplifier)
IC231 LA1844ML (Tuner System)
IC450 LC75342M (2 band equalizer)
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CCB
INTERFACE
CONTROL
CIRCUIT
15
14
16
17
18
19
20
21 22 24 25 26 23
10 9 7 6 5 8
11
L4
L3
L2
L1
NC
NC
R1
R2
R3
R4
RSELO RIN RTRE RBASS1 RBASS2 ROUT
LSELO LIN LTRE LBASS1 LBASS2 LOUT
TEST
V
SS
CE
DI
CL
V
DD
Vref
NC
12
13
1
2
30
29
28
27
4
3
LVref
RVref