Daewoo AMI-225M - Tuner Section Schematic

Schemetic Diagram
- 13 -
Model No:AMI-225M/MU, 325M/MU 2BAND
Ass'y Name: TUNER
21 20
19
11
15
14
2
12
17
4
5
7
8
6
18
9
16
13
3
10
22
1
VSS VT
N.C
MUTE
AM OSC
1/2
VT-IN FM/AM IF N.C VDD
IF REQ
DO
DI
CL
C B
I/F
AM/FM
PD
FM OSC
ST/MO
X-OUT
X-IN
FM
CE
TOKO
L101
KWANGSUNG
TOKO : RBW07VB-K5024
KWANGSUNG : KSNT-213M-1
CC104 : 12pF
CC104 : 15pF
MAIN GND
3
14
13
1
2
10
6 5 4 9 8 7 11 12
6
5
3
2
41 7
9
8
13
11 14
1210
S-CURVE
AM/FM
IF
BUFF
304KHz
19K 19K 0
IC202
Pin No.
2.5
N.C
12
Vtg(V) 1.81.8
#2 : STEREO ON(0V)
OTHERWISE(5V)
#1 : SD ON(0V)
OTHERWISE(5V)
0
Vtg(V)
Pin No.
Name
1 2
VCC
Vtg(V)
13
#1 : FM(3.7), AM(0)
#3 : FM(3.7), AM(0)
#5 : FM(0), AM(2.4)
#7 : VT
Vtg(V)
Name
E(1)
IC201
Pin No.
13 14
Name
Pin No.
Vtg(V)
1 2
2.1 4.8
15
3
2.1
4
2.1
5 6 7 8 9 10 11 12
GND 2.9
16 17 18 19 20 21 22 23 24
#2#1
#3
4.8 3.5 3.8
#6 : FM(2.4), AM(0)
#4 : FM(0), AM(12)
#2 : ON TUNING OPERATION(VCC)
B(3)
C(2)
512
0
012
BASIC : FM
REMARK
GND
Q001
0
Q003
12
Q104 IC205
12
0
0
0
14
N.C
2.1
3
0
2.1 2.1 2.1 2.1 2.1#4 #5 4.8 3.5
#3 : NORMAL(V=< 0.5V )
MUTE(1.4V=<V=<2.2V)
SEEK(V>=3.5V)
#4 : FM(0V), AM(1.5V)
#5 : FM(0.2V), AM(0.9V)
1
4 5 6 7 8 9 10 11
15 16 17 18 19 20 21 22
GNDVCC 2.5
#40 0
#5 #6
VCC
1
#1 #2
#7
#3 0
CE
X
O
R217
CC214
FTZ
CE
FTZ
JW
O
FTZ OPTION
L202 R214R215
X
O
X
O
X
OO
X
L201
X
O
CC215
X
O
X
O
JW204JW205
R218
JW
O
R219
X
O
R220
X
O
JW213
O
X
CC203
820pF
CF002
MS3-A
MJ-A560pF
TU001
4Gang
3Gang