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IC BLOCK DIAGRAM & DESCRIPTION
1
4
52 3
VCC
HEAD
SWITCH
CTRL1
CTRL2
GND
IC443 BA7755A (Head Switch)IC440 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 1211
1314
15
16
17
1819
20
21222324
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
FILTER
GND
VCC
CRO/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
MUTE
IN-L
GND
IN-R
VSS
OUT-L
IN-L
OUT-R
5
7
9
11
4
8
3
1
6
10
2
+
+
-
-
IN-R
IN-R
IN-R
IC442 TDA7269 ( Stereo Amplifier)
FM
IF
FM
DET
LEVEL
DET
S-CURVE
AM/FM
IF
BUFF
REG
GND
COMP
TUNING
DRIVE
AM
IF
AM
DET
VCC
AGC
PILOT
CANCEL
PILOT
DET
DECODER
ANTI-BIRDIE
STEREO
SW
FF
38k
FF
19k
VCO
304kHz
AM
RF.AMP
AM
MIX
AM
OSC
ALC
BUFF
P-DET
FF
19k
2
1
2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
IC231 LA1844ML ( Tuner System)
IC445 MM1453XF (Q Xpander with Spread Control)
18
2
34567
1718 16
15 14 13 12 11 10
V
CC
QF2 QF3 QF4 QF5 QF6QF1
V
REF
L
IN
R
IN
PNR S/Q DET Q
IN
SPC R
OUT
L
OUT
9
GND
VIRTUAL AUDIO
QXpander
PROCESSOR
Bias