Sanyo DC-DA370 Service Manual page 13

IC BLOCK DIAGRAM & DESCRIPTION
IC440 AN7348K ( Play/Rec Pre Amp)
24 23 22 21
A/Rec
Mute
B
PB Amp(L)
PB Amp(R)
A/Rec
Mute
B
1 2 3 4
IC445 MM1453XF (Q Xpander with Spread Control)
V
L V
CC
IN REF
18 17 16
Bias
1 2 3
R PNR S/Q
IN
IC231 LA1844ML ( Tuner System)
LEVEL
20 19 18 16
17
P
ALC
R
Rec
Amp(L)
Rec
Amp(R)
R
Logic
A/B
Logic
Rec/PB
5 6 8 9
7
QF1 QF2 QF3 QF4
15 14 13 12
VIRTUAL AUDIO
QXpander
PROCESSOR
4 5 6 7
DET Q SPC R
IN OUT
24 23 22 21
ALC
AM AM
AM
MIX RF.AMP
OSC
BUFF
AM
IF
AM/FM
DET
IF
S-CURVE
BUFF
FM
FM
IF
DET
REG
2 3 4
1
14 13
15
R
P
Nor/Cro
& Hi/Lo
Logic
Ripple
P
Rejection
10 11 12
QF5 QF6
11 10
8 9
L GND
OUT
20 19 18 17
AGC
P-DET
AM
φ
DET
COMP
VCO
304kHz
TUNING
DRIVE
GND
5 6 7 8
- 12 -
IC443 BA7755A (Head Switch)
1 2 3
HEAD
VCC
GND
SWITCH
IC442 TDA7269 ( Stereo Amplifier)
VSS
3
MUTE 5
+
7
IN-L
-
GND 9
-
IN-R 11
+
1 6
IN-R IN-R
16 15 14 13
PILOT
DECODER
CANCEL
ANTI-BIRDIE
STEREO
SW
FF FF FF
PILOT
π
38k 19k∠ 19k∠
DET
2
VCC
9 10 11 12
5
4
CTRL2 CTRL1
4
OUT-L
IN-L
8
10
IN-R
2
OUT-R