ICF-C273
12
12
4-2. BLOCK DIAGRAM
19
20
16
12
5
1
2
3
11
10
9
12
8
3
4
16
17
23
24
27
51
72
70
71
48
49
50
65
66
67
68
X101
32.768MHz
SYSTEM
CONTROL
IC101
X51
75kHz
W2
FM
WIRE
ANTENNA
XIN
FM RF IN
FM RF
FM OSC
BAND SELECT
AM OSC
AM RF IN
REG OUT
AOUT
AIN
XIN
CE
DT
CL
CE
DT
CL
L1
AM
FERRITE-ROD
ANTENNA
L1,CT1
AM TRACKING
PD
XIN
NF
FM IN
AM IN
74
75
53
6 - 9
10 - 37
X102
4.192MHz
54 55 56 57 61 62 63 64
76
5
RESET
IC102
18
IC
A OUT
D52
D106
D53
14
IC
VDD
LCD101
LCD DISPLAY
VDD
(IC101)
VOLTAG
DET
Q101
4V REG
Q201,D203
REG
Q202,D204
RECT
D205
FM
FROT END
SWITCH
Q3
VOLUME
RV1
T1
AM IF
CF1
CF2
MUTE
Q4
FM IF
DISCRI
AF
POWER
AMP
SPEAKER
SP1
LED
SWITCH
Q102,103
LED
SDRIVE
Q108
LED
DRIVE
Q109
LED
SWITCH
Q104-107
AM IF
DET
FM/AM
FE OUT
AM
IF
IN
FM
IF
IN
AF IN
FM/AM
FRONT-END,IF AMP
DET,POWER AMP
IC1
DET
OUT
AF
OUT
T201
POWER
TRANSFORMER
RECT
D201
RECT
D202,D51
46
1
2
VOLTAG
DET
IC103
1
5
18
17
5
15
7
AM
FROT END
14
D108
+4V
D109
D110
D111
ALARM A
ALARM A
ALARM B
+4V
+B
LIGHT1,2
LIGHT1,2
CE(R)
DATA(R)
CLOCK(R)
XT1
XT2
X1
X2
COM0
I
COM3
SEG0
I
SEG27
KS0
KS1
KS2
KS3(S0)
KS4(S1)
KS0
KS1
KS2
KS3
RESER
VLC0
VDET
MUTE
BUZZER
LIGHT1
LIGHT2
ALM-A
ALM-B
D112
ALARM B
D108-110
BACK LIGHT
AC IN
L2,CT3
FM TRACKING
L4
AM FREQUENCY
COVERAGE
L3
FM
OSC
L2
D3
CT1
D2
CT3
FM
OSC
KEY MATRIX
S101-114(SWITCH (A))
S115-117(ALARM)
S118,119(JOG)
PLL FREQUENCY
SYNTHESIZER
IC51
• Signal path.
F
: FM
e
: AM
