Sanyo DC-BM300 Service Manual page 12

IC BLOCK DIAGRAM & DESCRIPTION
IC231 LA1844ML (Tuner System)
24
BUFF
LEVEL
DET
FM
IF
IC440 AN7348K ( Play/Rec Pre Amp)
A/Rec
IC241 LC72121M-D (Pll Synthesizer)
2
Vssx
REFERENCE
XIN 1
DIVIDER
XOUT 24
SWALLOW COUNTER
FMIN 17 1/2
1/16, 1/17 4bits
12bits PROGRAMMABLE
AMIN 16
CE 3
DI 4
CCB
DATA SHIFT REGISTER LATCH
I / F
CL 5
DO 6
POWER
V 18 ON
DD
RESET
Vssd 15
8
7
BO1 BO2 BO3 BO4
23 22 21 20
ALC
AM AM
AM
MIX
RF.AMP
OSC
AGC
AM
IF
AM/FM
IF
COMP
S-CURVE
BUFF
TUNING
DRIVE
FM
DET
REG GND
1 2 3 4
24 23 22 21
Mute
B
PB Amp(L)
PB Amp(R)
A/Rec
Mute
B
2 4
1 3
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
DIVIDER
UNIVERSAL
COUNTER
9 10 11 14
IO1 IO2
19 18 17 16
DECODER
ANTI-BIRDIE
P-DET
AM
DET
VCO
304kHz
VCC
5 6 7 8
20 19 18 17 16
ALC
Rec
Amp(L)
Rec
Amp(R)
Logic
A/B
Logic
Rec/PB
5 6 7 8
IC441 LC75342M (2 band equalizer)
LSELO LIN LTRE
19 PD
L4
11
L3 12
20 AIN
21 AOUT
L2
13
22 Vssa
L1
14
NC 15
NC 16
R1 17
13 IFIN
R2 18
R3 19
R4
20
RSELO RIN RTRE
- 11 -
15 14 13
PILOT
CANCEL
STEREO
SW
FF
FF FF PILOT
38k 19k 19k
DET
2
9 10 11 12
15 14 13
R
P
P
R
Nor/Cro
& Hi/Lo
Logic
R
Ripple
P
Rejection
9 10 11 12
LBASS1 LBASS2
10 9 8 7 6
LVref
CONTROL
CIRCUIT
LOGIC CCB
CIRCUIT INTERFACE
CONTROL
CIRCUIT
RVref
21 22 23 24 25
RBASS1 RBASS2
LOUT
5
4 TEST
3
V
SS
2 CE
1 DI
30 CL
29 V
DD
28 Vref
27 NC
26
ROUT